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Giant Metrewave Radio Telescope

October 27, 2023

The Giant Metrewave Radio Telescope (GMRT), located near Narayangaon, Pune in India, is an array of thirty fully steerable parabolic radio telescopes of 45 metre diameter, observing at metre wavelengths. It is the largest and most sensitive radio telescope array in the world at low frequencies.[1] It is operated by the National Centre for Radio Astrophysics (NCRA), a part of the Tata Institute of Fundamental Research, Mumbai. It was conceived and built under the direction of Late Prof. Govind Swarup during 1984 to 1996.[2] It is an interferometric array with baselines of up to 25 kilometres (16 mi).[3][4][5] It was recently upgraded with new receivers, after which it is also known as the upgraded Giant Metrewave Radio Telescope (uGMRT).[6]

Giant Metrewave Radio Telescope
Alternative namesGMRT
Location(s)Narayangaon, Pune district, Pune division, Maharashtra, India
Coordinates19°05′47″N 74°02′59″E / 19.096517°N 74.049742°E / 19.096517; 74.049742
OrganizationNational Centre for Radio Astrophysics 
Wavelength50, 1,500 MHz (6.00, 0.20 m)
First light1995 
Telescope styleradio interferometer 
Number of telescopes30 
Diameter45 m (147 ft 8 in)
Collecting area47,713 m2 (513,580 sq ft)
Websitewww.gmrt.ncra.tifr.res.in
Location of Giant Metrewave Radio Telescope
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Location edit

The Giant Metrewave Radio Telescope (GMRT) Observatory is located about 80 km north of Pune at Khodad. A nearby town is Narayangaon which is around 9 km from the telescope site. The office of National Centre for Radio Astrophysics (NCRA) is located in the Savitribai Phule Pune University campus.

Science and observations edit

One of the aims for the telescope during its development was to search for the highly redshifted 21-cm line radiation from primordial neutral hydrogen clouds in order to determine the epoch of galaxy formation in the universe.[7][8][9][10][11][12][13][14][15][16][17][18][19][20][21][22][23][24][25][26][27][28][29][30]

Astronomers from all over the world regularly use this telescope to observe many different astronomical objects such as the Sun, Jupiter, exoplanets, magnetically active stars, microquasars or binary stars with a compact object (neutron star or black hole) as companion, pulsars, supernovae, supernovae remnants (SNR) HII regions, galaxies, quasars, radio galaxies, clusters of galaxies, cluster radio relics and halos, high-z galaxies, solar winds, Inter-galactic HI absorption lines, diffuse radio emission from filaments of galaxies, possible signs of time-variation of fundamental constants, variation of gas content with cosmic epoch, epoch of reionisation etc. .[3][6]

GMRT has produced an all sky survey named TIFR GMRT Sky Survey (TGSS). Nearly 90% of the sky has been imaged at the frequency of 150 MHz (wavelength 2m), with an angular resolution of 25 arc second and rms noise of 5 mili Jansky per beam. Source Catalogue and FITS image files for the scientific community are freely available.[31] General public and citizen scientists can see 150 MHz image of any, supernova remnant, spiral galaxy or radio galaxy with its name or position at the RAD@home RGB-maker web-tool. Power and versatility of the GMRT has led to a renaissance in the field of low frequency radio astronomy.[32]

From this, TGSS survey, data, in August 2018, the most distant known radio galaxy : TGSS J1530+1049, located at a distance of 12 billion light years, was discovered by GMRT.[33][34]

In February 2020, it helped in the observation of evidence of the largest known explosion in the history of the universe, the Ophiuchus Supercluster explosion.[35]

In January 2023, the telescope picked up a radio signal (21 cm line emission from neutral atomic hydrogen gas) which originated from 8.8 billion light years away. [36]

Activities edit

Each year on National Science Day the observatory invites the public and pupils from schools and colleges in the surrounding area to visit the site where they can listen to explanations of radio astronomy, receiver technology and astronomy from the engineers and astronomers who work there. Nearby schools/colleges are also invited to put their individual science experiments in exhibition and the best one in each level (primary, secondary school and Jr. college) are awarded.

Visitors are allowed into GMRT only on Fridays in two sessions - Morning (1100 hrs - 1300 hrs) and Evening (1500 hrs to 1700 hrs).

See also edit

References edit

  1. ^ "The Giant Metrewave Radio Telescope". NCRA website.
  2. ^ Prof. Govind Swarup: The Father of Radio Astronomy in India
  3. ^ a b Ananthakrishnan, S. (1995). "The giant meterwave radio telescope" (PDF). Journal of Astrophysics and Astronomy. 16: 433. Retrieved 27 June 2015.
  4. ^ Ishwara-Chandra, C H; Rao, A Pramesh; Pandey, Mamta; Manchanda, R K; Durouchoux, Philippe (2005). "Low Frequency Radio Observations of GRS1915+105 with GMRT". Chinese Journal of Astronomy and Astrophysics. 5 (S1): 87–92. arXiv:astro-ph/0512061. Bibcode:2005ChJAS...5...87I. doi:10.1088/1009-9271/5/S1/87.
  5. ^ Swarup, G., Ananthkrishnan, S., Kapahi, V.K., Rao, A.P., Subrahamanya, C.R., and Kulkarni, V.K. (1991) "The Giant Metrewave Radio Telescope", Current Science, vol. 60, pages 90-105.
  6. ^ a b Gupta, Y.; Ajithkumar, B.; Kale, H. S.; Nayak, S.; Sabhapathy, S.; Sureshkumar, S.; Swami, R. V.; Chengalur, J. N.; Ghosh, S. K.; Ishwara-Chandra, C. H.; Joshi, B. C.; Kanekar, N.; Lal, D. V.; Roy, S. (25 August 2017). "The Upgraded GMRT:Opening New Windows on the Radio Universe" (PDF). Current Science. 113 (04): 707. doi:10.18520/cs/v113/i04/707-714. ISSN 0011-3891.
  7. ^ Kapahi, V. K.; Ananthakrishnan, S. (1995). "Astronomy with the giant metrewave radio telescope (GMRT)" (PDF). Bulletin of the Astronomical Society of India. 23: 267. Bibcode:1995BASI...23..265K. Retrieved 27 June 2015.
  8. ^ Bharadwaj, Somnath; Nath, Biman B.; Sethi, Shiv K. (1 March 2001). "Using HI to probe large scale structures at z~3". Journal of Astrophysics and Astronomy. 22 (1): 21–34. arXiv:astro-ph/0003200. Bibcode:2001JApA...22...21B. doi:10.1007/BF02933588. ISSN 0250-6335. S2CID 14407741.
  9. ^ Bharadwaj, S.; Nath, B. B.; Sethi, S. K. (2002). "Probing Large Scale Structures in HI with GMRT". The Universe at Low Radio Frequencies. 199: 108–109. Bibcode:2002IAUS..199..108B. doi:10.1017/s0074180900168640.
  10. ^ Bharadwaj, Somnath; Sethi, Shiv K. (1 December 2001). "HI fluctuations at large redshifts: I-visibility correlation". Journal of Astrophysics and Astronomy. 22 (4): 293–307. arXiv:astro-ph/0203269. Bibcode:2001JApA...22..293B. doi:10.1007/BF02702273. ISSN 0973-7758. S2CID 14605700.
  11. ^ Bharadwaj, Somnath; Pandey, Sanjay K. (1 March 2003). "HI Fluctuations at Large Redshifts: II - the Signal Expected for the GMRT". Journal of Astrophysics and Astronomy. 24 (1–2): 23–35. arXiv:astro-ph/0307303. Bibcode:2003JApA...24...23B. doi:10.1007/BF03012189. ISSN 0250-6335. S2CID 18496656.
  12. ^ Bharadwaj, Somnath; Srikant, P. S. (1 March 2004). "HI Fluctuations at Large Redshifts: III - Simulating the Signal Expected at GMRT". Journal of Astrophysics and Astronomy. 25 (1–2): 67–80. arXiv:astro-ph/0402262. Bibcode:2004JApA...25...67B. doi:10.1007/BF02702289. ISSN 0250-6335. S2CID 8964798.
  13. ^ Pandey, Sanjay K.; Bharadwaj, Somnath; Saiyad Ali, S. K. (11 February 2006). "Probing the bispectrum at high redshifts using 21-cm H i observations". Monthly Notices of the Royal Astronomical Society. 366 (1): 213–218. arXiv:astro-ph/0510118. doi:10.1111/j.1365-2966.2005.09847.x. ISSN 0035-8711. S2CID 7600009.
  14. ^ Choudhury, T. Roy; Bharadwaj, Somnath; Datta, Kanan K. (1 December 2007). "Detecting ionized bubbles in redshifted 21-cm maps". Monthly Notices of the Royal Astronomical Society. 382 (2): 809–818. arXiv:astro-ph/0703677. Bibcode:2007MNRAS.382..809D. doi:10.1111/j.1365-2966.2007.12421.x. ISSN 0035-8711.
  15. ^ Chengalur, Jayaram N.; Bharadwaj, Somnath; Ali, Sk Saiyad (21 April 2008). "Foregrounds for redshifted 21-cm studies of reionization: Giant Meter Wave Radio Telescope 153-MHz observations". Monthly Notices of the Royal Astronomical Society. 385 (4): 2166–2174. arXiv:0801.2424. Bibcode:2008MNRAS.385.2166A. doi:10.1111/j.1365-2966.2008.12984.x. ISSN 0035-8711. S2CID 13541850.
  16. ^ Choudhury, T. Roy; Bharadwaj, Somnath; Majumdar, Suman; Datta, Kanan K. (21 December 2008). "Simulating the impact of H i fluctuations on matched filter search for ionized bubbles in redshifted 21-cm maps". Monthly Notices of the Royal Astronomical Society. 391 (4): 1900–1912. arXiv:0805.1734. Bibcode:2008MNRAS.391.1900D. doi:10.1111/j.1365-2966.2008.14008.x. ISSN 0035-8711. S2CID 15646124.
  17. ^ Choudhury, T. Roy; Bharadwaj, Somnath; Datta, Kanan K. (1 October 2009). "The optimal redshift for detecting ionized bubbles in Hi 21-cm maps". Monthly Notices of the Royal Astronomical Society: Letters. 399 (1): L132–L136. arXiv:0906.0360. Bibcode:2009MNRAS.399L.132D. doi:10.1111/j.1745-3933.2009.00739.x. ISSN 1745-3925. S2CID 8941846.
  18. ^ Choudhury, T. Roy; Datta, Kanan K.; Bharadwaj, Somnath; Majumdar, Suman (11 May 2011). "The impact of anisotropy from finite light traveltime on detecting ionized bubbles in redshifted 21-cm maps". Monthly Notices of the Royal Astronomical Society. 413 (2): 1409–1418. arXiv:1006.0430. Bibcode:2011MNRAS.413.1409M. doi:10.1111/j.1365-2966.2011.18223.x. ISSN 0035-8711. S2CID 8869385.
  19. ^ Ghosh, Abhik; Bharadwaj, Somnath; Ali, Sk. Saiyad; Chengalur, Jayaram N. (1 March 2011). "GMRT observation towards detecting the post-reionization 21-cm signal". Monthly Notices of the Royal Astronomical Society. 411 (4): 2426–2438. arXiv:1010.4489. Bibcode:2011MNRAS.411.2426G. doi:10.1111/j.1365-2966.2010.17853.x. ISSN 0035-8711. S2CID 119230101.
  20. ^ Ghosh, Abhik; Bharadwaj, Somnath; Ali, Sk. Saiyad; Chengalur, Jayaram N. (1 December 2011). "Improved foreground removal in GMRT 610 MHz observations towards redshifted 21-cm tomography". Monthly Notices of the Royal Astronomical Society. 418 (4): 2584–2589. arXiv:1108.3707. Bibcode:2011MNRAS.418.2584G. doi:10.1111/j.1365-2966.2011.19649.x. ISSN 0035-8711. S2CID 118437718.
  21. ^ Choudhury, T. Roy; Bharadwaj, Somnath; Majumdar, Suman (11 November 2012). "Constraining quasar and intergalactic medium properties through bubble detection in redshifted 21-cm maps". Monthly Notices of the Royal Astronomical Society. 426 (4): 3178–3194. arXiv:1111.6354. Bibcode:2012MNRAS.426.3178M. doi:10.1111/j.1365-2966.2012.21914.x. ISSN 0035-8711. S2CID 118436604.
  22. ^ Chengalur, Jayaram N.; Ali, Sk Saiyad; Bharadwaj, Somnath; Prasad, Jayanti; Ghosh, Abhik (11 November 2012). "Characterizing foreground for redshifted 21 cm radiation: 150 MHz Giant Metrewave Radio Telescope observations". Monthly Notices of the Royal Astronomical Society. 426 (4): 3295–3314. arXiv:1208.1617. Bibcode:2012MNRAS.426.3295G. doi:10.1111/j.1365-2966.2012.21889.x. ISSN 0035-8711. S2CID 54662482.
  23. ^ Ghosh, A.; Prasad, J.; Bharadwaj, S.; Ali, Sk. S.; Chengalur, J. N. (1 April 2013). "VizieR Online Data Catalog: Complete 150MHz GMRT source catalogue (Ghosh+, 2012)". VizieR On-line Data Catalog. 742. Bibcode:2013yCat..74263295G.
  24. ^ Ali, Sk Saiyad; Ghosh, Abhik; Bharadwaj, Somnath; Choudhuri, Samir (21 December 2014). "Visibility-based angular power spectrum estimation in low-frequency radio interferometric observations". Monthly Notices of the Royal Astronomical Society. 445 (4): 4351–4365. arXiv:1409.7789. Bibcode:2014MNRAS.445.4351C. doi:10.1093/mnras/stu2027. ISSN 0035-8711.
  25. ^ Choudhuri, Samir; Bharadwaj, Somnath; Ali, Sk. Saiyad (2014). "Foreground simulation and power spectrum estimation for 610 MHz GMRT observations". Astronomical Society of India Conference Series. 13: 315–317. Bibcode:2014ASInC..13..315C.
  26. ^ Ghosh, Abhik; Roy, Nirupam; Ali, Sk Saiyad; Chatterjee, Suman; Bharadwaj, Somnath; Choudhuri, Samir (21 December 2016). "The visibility-based tapered gridded estimator (TGE) for the redshifted 21-cm power spectrum". Monthly Notices of the Royal Astronomical Society. 463 (4): 4093–4107. arXiv:1609.01732. Bibcode:2016MNRAS.463.4093C. doi:10.1093/mnras/stw2254. ISSN 0035-8711.
  27. ^ Ali, Sk. Saiyad; Bharadwaj, Somnath; Choudhuri, Samir; Ghosh, Abhik; Roy, Nirupam (28 November 2016). "Prospects of Measuring the Angular Power Spectrum of the Diffuse Galactic Synchrotron Emission with SKA1 Low" (PDF). Journal of Astrophysics and Astronomy. 37 (4): 35. arXiv:1610.08184. Bibcode:2016JApA...37...35A. doi:10.1007/s12036-016-9413-x. ISSN 0973-7758. S2CID 55989492.
  28. ^ Ghosh, Abhik; Intema, Huib T.; Roy, Nirupam; Ali, Sk Saiyad; Bharadwaj, Somnath; Choudhuri, Samir (1 September 2017). "The angular power spectrum measurement of the Galactic synchrotron emission in two fields of the TGSS survey". Monthly Notices of the Royal Astronomical Society: Letters. 470 (1): L11–L15. arXiv:1704.08642. Bibcode:2017MNRAS.470L..11C. doi:10.1093/mnrasl/slx066. ISSN 1745-3925.
  29. ^ Chatterjee, Suman; Bharadwaj, Somnath (1 February 2019). "On the prospects of measuring the cosmic dawn 21-cm power spectrum using the upgraded Giant Metrewave Radio Telescope (uGMRT)". Monthly Notices of the Royal Astronomical Society. 483 (2): 2269–2274. arXiv:1804.00515. Bibcode:2019MNRAS.483.2269C. doi:10.1093/mnras/sty3242. ISSN 0035-8711.
  30. ^ Dutta, Prasun; Choudhuri, Samir; Pal, Srijita; Bharadwaj, Somnath (11 March 2019). "A Tapered Gridded Estimator (TGE) for the multifrequency angular power spectrum (MAPS) and the cosmological H i 21-cm power spectrum". Monthly Notices of the Royal Astronomical Society. 483 (4): 5694–5700. arXiv:1812.08801. Bibcode:2019MNRAS.483.5694B. doi:10.1093/mnras/sty3501. ISSN 0035-8711.
  31. ^ Intema, H. T.; Jagannathan, P.; Mooley, K. P.; Frail, D. A. (February 2017). "The GMRT 150 MHz all-sky radio survey: First alternative data release TGSS ADR1". Astronomy & Astrophysics. 598: A78. doi:10.1051/0004-6361/201628536. ISSN 0004-6361.
  32. ^ Kembhavi, Ajit K.; Chengalur, Jayaram N. (19 April 2023). "Govind Swarup. 23 March 1929—7 September 2020". Biographical Memoirs of Fellows of the Royal Society. doi:10.1098/rsbm.2022.0049. ISSN 0080-4606.
  33. ^ Netherlands Research School for Astronomy (8 August 2018). "Astronomers report the most distant radio galaxy ever discovered". Phys.org. Science X Network. doi:10.1093/mnras/sty1996. Retrieved 23 July 2023.
  34. ^ "Telescope In Pune Discovers Most Distant Radio Galaxy Ever Found". NDTV.com. Retrieved 13 June 2019.
  35. ^ "Astronomers detect biggest explosion in the history of the Universe". ScienceDaily. Retrieved 27 February 2020.
  36. ^ https://www.indiatoday.in/science/story/indian-astronomer-captures-radio-signal-that-originated-8-billion-years-ago-2324134-2023-01-20. {{cite web}}: Missing or empty |title= (help)

External links edit

 
Wikimedia Commons has media related to GMRT.
  • GMRT Homepage
  • Y-shaped array
  • GMRT Visit 25 February 2015 at the Wayback Machine

October 27, 2023
giant, metrewave, radio, telescope, gmrt, located, near, narayangaon, pune, india, array, thirty, fully, steerable, parabolic, radio, telescopes, metre, diameter, observing, metre, wavelengths, largest, most, sensitive, radio, telescope, array, world, frequenc. The Giant Metrewave Radio Telescope GMRT located near Narayangaon Pune in India is an array of thirty fully steerable parabolic radio telescopes of 45 metre diameter observing at metre wavelengths It is the largest and most sensitive radio telescope array in the world at low frequencies 1 It is operated by the National Centre for Radio Astrophysics NCRA a part of the Tata Institute of Fundamental Research Mumbai It was conceived and built under the direction of Late Prof Govind Swarup during 1984 to 1996 2 It is an interferometric array with baselines of up to 25 kilometres 16 mi 3 4 5 It was recently upgraded with new receivers after which it is also known as the upgraded Giant Metrewave Radio Telescope uGMRT 6 Giant Metrewave Radio TelescopeAlternative namesGMRTLocation s Narayangaon Pune district Pune division Maharashtra IndiaCoordinates19 05 47 N 74 02 59 E 19 096517 N 74 049742 E 19 096517 74 049742OrganizationNational Centre for Radio Astrophysics Wavelength50 1 500 MHz 6 00 0 20 m First light1995 Telescope styleradio interferometer Number of telescopes30 Diameter45 m 147 ft 8 in Collecting area47 713 m2 513 580 sq ft Websitewww wbr gmrt wbr ncra wbr tifr wbr res wbr inLocation of Giant Metrewave Radio Telescope Related media on Commons edit on Wikidata Contents 1 Location 2 Science and observations 3 Activities 4 See also 5 References 6 External linksLocation editThe Giant Metrewave Radio Telescope GMRT Observatory is located about 80 km north of Pune at Khodad A nearby town is Narayangaon which is around 9 km from the telescope site The office of National Centre for Radio Astrophysics NCRA is located in the Savitribai Phule Pune University campus Science and observations editOne of the aims for the telescope during its development was to search for the highly redshifted 21 cm line radiation from primordial neutral hydrogen clouds in order to determine the epoch of galaxy formation in the universe 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 Astronomers from all over the world regularly use this telescope to observe many different astronomical objects such as the Sun Jupiter exoplanets magnetically active stars microquasars or binary stars with a compact object neutron star or black hole as companion pulsars supernovae supernovae remnants SNR HII regions galaxies quasars radio galaxies clusters of galaxies cluster radio relics and halos high z galaxies solar winds Inter galactic HI absorption lines diffuse radio emission from filaments of galaxies possible signs of time variation of fundamental constants variation of gas content with cosmic epoch epoch of reionisation etc 3 6 GMRT has produced an all sky survey named TIFR GMRT Sky Survey TGSS Nearly 90 of the sky has been imaged at the frequency of 150 MHz wavelength 2m with an angular resolution of 25 arc second and rms noise of 5 mili Jansky per beam Source Catalogue and FITS image files for the scientific community are freely available 31 General public and citizen scientists can see 150 MHz image of any supernova remnant spiral galaxy or radio galaxy with its name or position at the RAD home RGB maker web tool Power and versatility of the GMRT has led to a renaissance in the field of low frequency radio astronomy 32 From this TGSS survey data in August 2018 the most distant known radio galaxy TGSS J1530 1049 located at a distance of 12 billion light years was discovered by GMRT 33 34 In February 2020 it helped in the observation of evidence of the largest known explosion in the history of the universe the Ophiuchus Supercluster explosion 35 In January 2023 the telescope picked up a radio signal 21 cm line emission from neutral atomic hydrogen gas which originated from 8 8 billion light years away 36 Activities editEach year on National Science Day the observatory invites the public and pupils from schools and colleges in the surrounding area to visit the site where they can listen to explanations of radio astronomy receiver technology and astronomy from the engineers and astronomers who work there Nearby schools colleges are also invited to put their individual science experiments in exhibition and the best one in each level primary secondary school and Jr college are awarded Visitors are allowed into GMRT only on Fridays in two sessions Morning 1100 hrs 1300 hrs and Evening 1500 hrs to 1700 hrs See also editList of radio telescopesReferences edit The Giant Metrewave Radio Telescope NCRA website Prof Govind Swarup The Father of Radio Astronomy in India a b Ananthakrishnan S 1995 The giant meterwave radio telescope PDF Journal of Astrophysics and Astronomy 16 433 Retrieved 27 June 2015 Ishwara Chandra C H Rao A Pramesh Pandey Mamta Manchanda R K Durouchoux Philippe 2005 Low Frequency Radio Observations of GRS1915 105 with GMRT Chinese Journal of Astronomy and Astrophysics 5 S1 87 92 arXiv astro ph 0512061 Bibcode 2005ChJAS 5 87I doi 10 1088 1009 9271 5 S1 87 Swarup G Ananthkrishnan S Kapahi V K Rao A P Subrahamanya C R and Kulkarni V K 1991 The Giant Metrewave Radio Telescope Current Science vol 60 pages 90 105 a b Gupta Y Ajithkumar B Kale H S Nayak S Sabhapathy S Sureshkumar S Swami R V Chengalur J N Ghosh S K Ishwara Chandra C H Joshi B C Kanekar N Lal D V Roy S 25 August 2017 The Upgraded GMRT Opening New Windows on the Radio Universe PDF Current Science 113 04 707 doi 10 18520 cs v113 i04 707 714 ISSN 0011 3891 Kapahi V K Ananthakrishnan S 1995 Astronomy with the giant metrewave radio telescope GMRT PDF Bulletin of the Astronomical Society of India 23 267 Bibcode 1995BASI 23 265K Retrieved 27 June 2015 Bharadwaj Somnath Nath Biman B Sethi Shiv K 1 March 2001 Using HI to probe large scale structures at z 3 Journal of Astrophysics and Astronomy 22 1 21 34 arXiv astro ph 0003200 Bibcode 2001JApA 22 21B doi 10 1007 BF02933588 ISSN 0250 6335 S2CID 14407741 Bharadwaj S Nath B B Sethi S K 2002 Probing Large Scale Structures in HI with GMRT The Universe at Low Radio Frequencies 199 108 109 Bibcode 2002IAUS 199 108B doi 10 1017 s0074180900168640 Bharadwaj Somnath Sethi Shiv K 1 December 2001 HI fluctuations at large redshifts I visibility correlation Journal of Astrophysics and Astronomy 22 4 293 307 arXiv astro ph 0203269 Bibcode 2001JApA 22 293B doi 10 1007 BF02702273 ISSN 0973 7758 S2CID 14605700 Bharadwaj Somnath Pandey Sanjay K 1 March 2003 HI Fluctuations at Large Redshifts II the Signal Expected for the GMRT Journal of Astrophysics and Astronomy 24 1 2 23 35 arXiv astro ph 0307303 Bibcode 2003JApA 24 23B doi 10 1007 BF03012189 ISSN 0250 6335 S2CID 18496656 Bharadwaj Somnath Srikant P S 1 March 2004 HI Fluctuations at Large Redshifts III Simulating the Signal Expected at GMRT Journal of Astrophysics and Astronomy 25 1 2 67 80 arXiv astro ph 0402262 Bibcode 2004JApA 25 67B doi 10 1007 BF02702289 ISSN 0250 6335 S2CID 8964798 Pandey Sanjay K Bharadwaj Somnath Saiyad Ali S K 11 February 2006 Probing the bispectrum at high redshifts using 21 cm H i observations Monthly Notices of the Royal Astronomical Society 366 1 213 218 arXiv astro ph 0510118 doi 10 1111 j 1365 2966 2005 09847 x ISSN 0035 8711 S2CID 7600009 Choudhury T Roy Bharadwaj Somnath Datta Kanan K 1 December 2007 Detecting ionized bubbles in redshifted 21 cm maps Monthly Notices of the Royal Astronomical Society 382 2 809 818 arXiv astro ph 0703677 Bibcode 2007MNRAS 382 809D doi 10 1111 j 1365 2966 2007 12421 x ISSN 0035 8711 Chengalur Jayaram N Bharadwaj Somnath Ali Sk Saiyad 21 April 2008 Foregrounds for redshifted 21 cm studies of reionization Giant Meter Wave Radio Telescope 153 MHz observations Monthly Notices of the Royal Astronomical Society 385 4 2166 2174 arXiv 0801 2424 Bibcode 2008MNRAS 385 2166A doi 10 1111 j 1365 2966 2008 12984 x ISSN 0035 8711 S2CID 13541850 Choudhury T Roy Bharadwaj Somnath Majumdar Suman Datta Kanan K 21 December 2008 Simulating the impact of H i fluctuations on matched filter search for ionized bubbles in redshifted 21 cm maps Monthly Notices of the Royal Astronomical Society 391 4 1900 1912 arXiv 0805 1734 Bibcode 2008MNRAS 391 1900D doi 10 1111 j 1365 2966 2008 14008 x ISSN 0035 8711 S2CID 15646124 Choudhury T Roy Bharadwaj Somnath Datta Kanan K 1 October 2009 The optimal redshift for detecting ionized bubbles in Hi 21 cm maps Monthly Notices of the Royal Astronomical Society Letters 399 1 L132 L136 arXiv 0906 0360 Bibcode 2009MNRAS 399L 132D doi 10 1111 j 1745 3933 2009 00739 x ISSN 1745 3925 S2CID 8941846 Choudhury T Roy Datta Kanan K Bharadwaj Somnath Majumdar Suman 11 May 2011 The impact of anisotropy from finite light traveltime on detecting ionized bubbles in redshifted 21 cm maps Monthly Notices of the Royal Astronomical Society 413 2 1409 1418 arXiv 1006 0430 Bibcode 2011MNRAS 413 1409M doi 10 1111 j 1365 2966 2011 18223 x ISSN 0035 8711 S2CID 8869385 Ghosh Abhik Bharadwaj Somnath Ali Sk Saiyad Chengalur Jayaram N 1 March 2011 GMRT observation towards detecting the post reionization 21 cm signal Monthly Notices of the Royal Astronomical Society 411 4 2426 2438 arXiv 1010 4489 Bibcode 2011MNRAS 411 2426G doi 10 1111 j 1365 2966 2010 17853 x ISSN 0035 8711 S2CID 119230101 Ghosh Abhik Bharadwaj Somnath Ali Sk Saiyad Chengalur Jayaram N 1 December 2011 Improved foreground removal in GMRT 610 MHz observations towards redshifted 21 cm tomography Monthly Notices of the Royal Astronomical Society 418 4 2584 2589 arXiv 1108 3707 Bibcode 2011MNRAS 418 2584G doi 10 1111 j 1365 2966 2011 19649 x ISSN 0035 8711 S2CID 118437718 Choudhury T Roy Bharadwaj Somnath Majumdar Suman 11 November 2012 Constraining quasar and intergalactic medium properties through bubble detection in redshifted 21 cm maps Monthly Notices of the Royal Astronomical Society 426 4 3178 3194 arXiv 1111 6354 Bibcode 2012MNRAS 426 3178M doi 10 1111 j 1365 2966 2012 21914 x ISSN 0035 8711 S2CID 118436604 Chengalur Jayaram N Ali Sk Saiyad Bharadwaj Somnath Prasad Jayanti Ghosh Abhik 11 November 2012 Characterizing foreground for redshifted 21 cm radiation 150 MHz Giant Metrewave Radio Telescope observations Monthly Notices of the Royal Astronomical Society 426 4 3295 3314 arXiv 1208 1617 Bibcode 2012MNRAS 426 3295G doi 10 1111 j 1365 2966 2012 21889 x ISSN 0035 8711 S2CID 54662482 Ghosh A Prasad J Bharadwaj S Ali Sk S Chengalur J N 1 April 2013 VizieR Online Data Catalog Complete 150MHz GMRT source catalogue Ghosh 2012 VizieR On line Data Catalog 742 Bibcode 2013yCat 74263295G Ali Sk Saiyad Ghosh Abhik Bharadwaj Somnath Choudhuri Samir 21 December 2014 Visibility based angular power spectrum estimation in low frequency radio interferometric observations Monthly Notices of the Royal Astronomical Society 445 4 4351 4365 arXiv 1409 7789 Bibcode 2014MNRAS 445 4351C doi 10 1093 mnras stu2027 ISSN 0035 8711 Choudhuri Samir Bharadwaj Somnath Ali Sk Saiyad 2014 Foreground simulation and power spectrum estimation for 610 MHz GMRT observations Astronomical Society of India Conference Series 13 315 317 Bibcode 2014ASInC 13 315C Ghosh Abhik Roy Nirupam Ali Sk Saiyad Chatterjee Suman Bharadwaj Somnath Choudhuri Samir 21 December 2016 The visibility based tapered gridded estimator TGE for the redshifted 21 cm power spectrum Monthly Notices of the Royal Astronomical Society 463 4 4093 4107 arXiv 1609 01732 Bibcode 2016MNRAS 463 4093C doi 10 1093 mnras stw2254 ISSN 0035 8711 Ali Sk Saiyad Bharadwaj Somnath Choudhuri Samir Ghosh Abhik Roy Nirupam 28 November 2016 Prospects of Measuring the Angular Power Spectrum of the Diffuse Galactic Synchrotron Emission with SKA1 Low PDF Journal of Astrophysics and Astronomy 37 4 35 arXiv 1610 08184 Bibcode 2016JApA 37 35A doi 10 1007 s12036 016 9413 x ISSN 0973 7758 S2CID 55989492 Ghosh Abhik Intema Huib T Roy Nirupam Ali Sk Saiyad Bharadwaj Somnath Choudhuri Samir 1 September 2017 The angular power spectrum measurement of the Galactic synchrotron emission in two fields of the TGSS survey Monthly Notices of the Royal Astronomical Society Letters 470 1 L11 L15 arXiv 1704 08642 Bibcode 2017MNRAS 470L 11C doi 10 1093 mnrasl slx066 ISSN 1745 3925 Chatterjee Suman Bharadwaj Somnath 1 February 2019 On the prospects of measuring the cosmic dawn 21 cm power spectrum using the upgraded Giant Metrewave Radio Telescope uGMRT Monthly Notices of the Royal Astronomical Society 483 2 2269 2274 arXiv 1804 00515 Bibcode 2019MNRAS 483 2269C doi 10 1093 mnras sty3242 ISSN 0035 8711 Dutta Prasun Choudhuri Samir Pal Srijita Bharadwaj Somnath 11 March 2019 A Tapered Gridded Estimator TGE for the multifrequency angular power spectrum MAPS and the cosmological H i 21 cm power spectrum Monthly Notices of the Royal Astronomical Society 483 4 5694 5700 arXiv 1812 08801 Bibcode 2019MNRAS 483 5694B doi 10 1093 mnras sty3501 ISSN 0035 8711 Intema H T Jagannathan P Mooley K P Frail D A February 2017 The GMRT 150 MHz all sky radio survey First alternative data release TGSS ADR1 Astronomy amp Astrophysics 598 A78 doi 10 1051 0004 6361 201628536 ISSN 0004 6361 Kembhavi Ajit K Chengalur Jayaram N 19 April 2023 Govind Swarup 23 March 1929 7 September 2020 Biographical Memoirs of Fellows of the Royal Society doi 10 1098 rsbm 2022 0049 ISSN 0080 4606 Netherlands Research School for Astronomy 8 August 2018 Astronomers report the most distant radio galaxy ever discovered Phys org Science X Network doi 10 1093 mnras sty1996 Retrieved 23 July 2023 Telescope In Pune Discovers Most Distant Radio Galaxy Ever Found NDTV com Retrieved 13 June 2019 Astronomers detect biggest explosion in the history of the Universe ScienceDaily Retrieved 27 February 2020 https www indiatoday in science story indian astronomer captures radio signal that originated 8 billion years ago 2324134 2023 01 20 a href Template Cite web html title Template Cite web cite web a Missing or empty title help External links edit nbsp Wikimedia Commons has media related to GMRT GMRT Homepage Y shaped array Visit GMRT GMRT Visit Archived 25 February 2015 at the Wayback Machine Portals nbsp India nbsp Astronomy nbsp Stars nbsp Spaceflight nbsp Outer space nbsp Solar System nbsp Education nbsp Science Retrieved from https en wikipedia org w index php title Giant Metrewave Radio Telescope amp oldid 1179422099, wikipedia, wiki, book, books, library,

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