Zobrazeno 1 - 10
of 199
pro vyhledávání: '"D J Saikia"'
Autor:
Vaidehi S. Paliya, D. J. Saikia
Publikováno v:
The Astrophysical Journal Letters, Vol 967, Iss 2, p L26 (2024)
The astrophysical γ -ray photons carry the signatures of the violent phenomena happening on various astronomical scales in our Universe. This includes supernova remnants, pulsars, and pulsar wind nebulae in the Galactic environment and extragalactic
Externí odkaz:
https://doaj.org/article/3ff39aa7f1954eeeb71f8528a1cdb268
Publikováno v:
The Astrophysical Journal, Vol 976, Iss 1, p 120 (2024)
The extragalactic γ -ray sky is dominated by relativistic jets aligned to the observer’s line of sight, i.e., blazars. A few of their misaligned counterparts, e.g., radio galaxies, are also detected with the Fermi-Large Area Telescope (LAT), albei
Externí odkaz:
https://doaj.org/article/99a0262d86974aed96c5b47fd8163dc8
Autor:
Yogesh Chandola, D. J. Saikia, Yin-Zhe Ma, Zheng Zheng, Chao-Wei Tsai, Di Li, Denis Tramonte, Hengxing Pan
Publikováno v:
The Astrophysical Journal, Vol 973, Iss 1, p 48 (2024)
Neutral atomic hydrogen and molecular gas in the host galaxies of radio active galactic nuclei can be traced using H i 21 cm and OH-1667 MHz absorption lines to understand the fueling and feedback processes. We present the results of an H i and OH ab
Externí odkaz:
https://doaj.org/article/edc4dcb957894229a1a9a842dbf6632e
Publikováno v:
The Astrophysical Journal, Vol 973, Iss 1, p 7 (2024)
Circumnuclear star formation (SF) is generally seen in galaxies hosting active galactic nuclei (AGN); however, the connection between the AGN activity and SF in them is less well understood. To explore this connection on scales of a few tens of parse
Externí odkaz:
https://doaj.org/article/908a21528c8e4a5f8b6908bcedff8752
Autor:
Payel Nandi, C. S. Stalin, D. J. Saikia, Rogemar A. Riffel, Arijit Manna, Sabyasachi Pal, O. L. Dors, Dominika Wylezalek, Vaidehi S. Paliya, Payaswini Saikia, Pratik Dabhade, Markus-Kissler Patig, Ram Sagar
Publikováno v:
The Astrophysical Journal, Vol 959, Iss 2, p 116 (2023)
Black-hole-driven outflows in galaxies hosting active galactic nuclei (AGN) may interact with their interstellar medium (ISM) affecting star formation (SF). Such feedback processes, reminiscent of those seen in massive galaxies, have been reported re
Externí odkaz:
https://doaj.org/article/0cef3757c123491e93570f12b7d8f839
Publikováno v:
The Astrophysical Journal, Vol 957, Iss 2, p 73 (2023)
The latest entry in the jetted active galactic nuclei (AGN) family is the Fanaroff–Riley type 0 (FR0) radio galaxies. They share several observational characteristics, e.g., nuclear emission and host galaxy morphology, with FR I sources; however, t
Externí odkaz:
https://doaj.org/article/27ab182dd8424dd79094743463d429a5
Autor:
Payel Nandi, C. S. Stalin, D. J. Saikia, S. Muneer, George Mountrichas, Dominika Wylezalek, R. Sagar, Markus Kissler-Patig
Publikováno v:
The Astrophysical Journal, Vol 950, Iss 2, p 81 (2023)
We present a detailed multiwavelength study of star formation in the dwarf galaxy NGC 4395, which hosts an active galactic nucleus (AGN). From our observations with the Ultra-Violet Imaging Telescope, we have compiled a catalog of 284 star-forming (S
Externí odkaz:
https://doaj.org/article/77ff9a09b72a4cf9aab46ecfc53b92ba
Autor:
B T Dullo, J H Knapen, R J Beswick, R D Baldi, D R A Williams, I M McHardy, D A Green, A Gil de Paz, S Aalto, A Alberdi, M K Argo, H-R Klöckner, I M Mutie, D J Saikia, P Saikia, I R Stevens
Publikováno v:
Monthly Notices of the Royal Astronomical Society. 522:3412-3438
Multiwavelength studies indicate that nuclear activity and bulge properties are closely related, but the details remain unclear. To study this further, we combine $Hubble~Space~Telescope$ bulge structural and photometric properties with 1.5 GHz, $e$-
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::a516922980b56798463a8ec96ff39600
https://doi.org/10.1093/mnras/stad1122
https://doi.org/10.1093/mnras/stad1122
Autor:
P. Dabhade, T. W. Shimwell, J. Bagchi, D. J. Saikia, F. Combes, M. Gaikwad, H. J. A. Röttgering, A. Mohapatra, C. H. Ishwara-Chandra, H. T. Intema, S. Raychaudhury
Publikováno v:
Astronomy & Astrophysics, 668:A64
We present for the first time a study of peculiar giant radio galaxy (GRG) J223301+131502 using deep multi-frequency radio observations from GMRT (323, 612, and 1300 MHz) and LOFAR (144 MHz) along with optical spectroscopic observations with the WHT~
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::fc1e6558d30ad2cadcf1692ebf2e231c
http://arxiv.org/abs/2209.13059
http://arxiv.org/abs/2209.13059
The orientation of the jet axis to the line of sight of the observer plays a major role in explaining the phenomena observed from blazars and radio galaxies. In the gamma-ray band, only a handful of radio galaxies have been identified, all being loca
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::5b22d3271a4ef6f8b16b407986375271