Zobrazeno 1 - 10
of 296
pro vyhledávání: '"R. Srianand"'
We study the time variability (over $\le$7.3 yrs) of ultra-fast outflows (UFOs) detected in a sample of 64 C IV broad absorption line (BAL) quasars (with 80 distinct BAL components) monitored using the Southern African Large Telescope. By comparing t
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::93703c2c6b7dc72fcc4dbe8e71d4d864
http://arxiv.org/abs/2305.02352
http://arxiv.org/abs/2305.02352
Akademický článek
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Publikováno v:
Monthly Notices of the Royal Astronomical Society. 514:1975-1989
We present a time variability analysis of broad absorption lines (BAL; spread over the velocity range of 5800-29000 km/s) seen in the spectrum of J132216.25+052446.3 (z(em)= 2.04806) at ten different epochs spanning over 19 years. The strongest absor
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::90462520c88c103fccd2b4d81ddc14c6
https://doi.org/10.1093/mnras/stac1460
https://doi.org/10.1093/mnras/stac1460
Autor:
J. D. Wagenveld, H.-R. Klöckner, N. Gupta, P. P. Deka, P. Jagannathan, S. Sekhar, S. A. Balashev, E. Boettcher, F. Combes, K. L. Emig, M. Hilton, G. I. G. Józsa, P. Kamphuis, D. Y. Klutse, K. Knowles, J.-K. Krogager, A. Mohapatra, E. Momjian, K. Moodley, S. Muller, P. Petitjean, P. Salas, S. Sikhosana, R. Srianand
The number counts of homogeneous samples of radio sources are a tried and true method of probing the large scale structure of the Universe, as most radio sources outside the galactic plane are at cosmological distances. As such they are expected to t
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::692c4613775cedbcc7ba4bf225528106
http://arxiv.org/abs/2302.10696
http://arxiv.org/abs/2302.10696
Autor:
P. Noterdaeme, S. Balashev, R. Cuellar, J.-K. Krogager, F. Combes, A. De Cia, N. Gupta, C. Ledoux, S. López, R. Srianand
Publikováno v:
Astronomy and Astrophysics-A&A
Astronomy and Astrophysics-A&A, 2023, 673, pp.A89. ⟨10.1051/0004-6361/202245554⟩
Astronomy and Astrophysics-A&A, 2023, 673, pp.A89. ⟨10.1051/0004-6361/202245554⟩
Proximate molecular quasar absorbers (PH2) are an intriguing population of absorption systems recently uncovered through strong H2 absorption at small velocity separation from the background quasars. We performed a multi-wavelength spectroscopic foll
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::9ea7be598409fef4e9aecfa3f25a575c
Autor:
Thirupathi Sivarani, Ramya Sethuram, S. Sriram, Devika Divakar, Arun Surya, Hari Mohan Varshney, Sudarshan Kambala, Amirul Hasan, Ajin Prakash, K. V. Govinda, null Viswanatha, G. C. Anupama, G. Maheswar, D. Ojha, S. B. Pandey, J. Pandey, M. Puravankara, A. N. Ramaprakash, B. E. Reddy, Sarang S. Shah, R. Srianand, A. Subramaniam, S. Subramanian
Publikováno v:
Journal of Astrophysics and Astronomy. 43
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::c228ec748e37aaca5b6eaff3fce2cca3
https://doi.org/10.1007/s12036-022-09867-y
https://doi.org/10.1007/s12036-022-09867-y
Akademický článek
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Autor:
F. Combes, N. Gupta, S. Muller, S. Balashev, P. P. Deka, K. L. Emig, H.-R. Klöckner, D. Klutse, K. Knowles, A. Mohapatra, E. Momjian, P. Noterdaeme, P. Petitjean, P. Salas, R. Srianand, J. D. Wagenveld
Publikováno v:
Astronomy & Astrophysics. 671:A43
The BL Lac PKS 1413+135 was observed by the Large Survey Project "MeerKAT Absorption Line Survey" (MALS) in the L-band, at 1139 MHz and 1293-1379 MHz, targeting the HI and OH lines in absorption at z = 0.24671. The radio continuum is thought to come
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::5390a17763f1ccc58b38b0585f3edee3
https://doi.org/10.1051/0004-6361/202245482
https://doi.org/10.1051/0004-6361/202245482
Autor:
K M Rajwade, M C Bezuidenhout, M Caleb, L N Driessen, F Jankowski, M Malenta, V Morello, S Sanidas, B W Stappers, M P Surnis, E D Barr, W Chen, M Kramer, J Wu, S Buchner, M Serylak, F Combes, W Fong, N Gupta, P Jagannathan, C D Kilpatrick, J-K Krogager, P Noterdaeme, C Núnẽz, J Xavier Prochaska, R Srianand, N Tejos
We report on the discovery and localization of fast radio bursts (FRBs) from the MeerTRAP project, a commensal fast radio transient-detection programme at MeerKAT in South Africa. Our hybrid approach combines a coherent search with an average field-o
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::995dd513e232526a4c458e1dd2902961
http://arxiv.org/abs/2205.14600
http://arxiv.org/abs/2205.14600
Autor:
N. Gupta, R. Srianand, E. Momjian, G. Shukla, F. Combes, J.-K. Krogager, P. Noterdaeme, P. Petitjean
Publikováno v:
The Astrophysical journal letters
The Astrophysical journal letters, 2022, 927, ⟨10.3847/2041-8213/ac589f⟩
The Astrophysical journal letters, 2022, 927, ⟨10.3847/2041-8213/ac589f⟩
We present optical spectroscopic and milli-arcsecond scale radio continuum observations of the quasar M1540-1453 ($z_{em}$ = 2.104$\pm$0.002) that shows associated HI 21-cm absorption at $z_{abs}$ = 2.1139. At sub-kpc scales, the powerful radio sourc
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::06f034dd743dd1102fbcfd3b70aea5bc
https://hal-insu.archives-ouvertes.fr/insu-03711528/document
https://hal-insu.archives-ouvertes.fr/insu-03711528/document