Zobrazeno 1 - 10
of 525
pro vyhledávání: '"Sandip K. Chakrabarti"'
Autor:
Sujoy Kumar Nath, Dipak Debnath, Kaushik Chatterjee, Riya Bhowmick, Hsiang-Kuang Chang, Sandip K. Chakrabarti
Publikováno v:
The Astrophysical Journal, Vol 960, Iss 1, p 5 (2023)
We study the recent outburst of the black hole candidate EXO 1846-031, which went into an outburst in 2019 after almost 34 yr in quiescence. We use archival data from the Swift/XRT, MAXI/GSC, NICER/XTI, and NuSTAR/FPM satellites/instruments to study
Externí odkaz:
https://doaj.org/article/04c00541ede84cb0a43ae88c491fc17c
Autor:
Prantik Nandi, Arka Chatterjee, Arghajit Jana, Sandip K. Chakrabarti, Sachindra Naik, Samar Safi-Harb, Hsiang-Kuang Chang, Jeremy Heyl
Publikováno v:
The Astrophysical Journal Supplement Series, Vol 269, Iss 1, p 15 (2023)
We analyze a sample of 21 “bare” Seyfert 1 active galactic nuclei, a subclass of Seyfert 1 galaxies, with intrinsic absorption N _H ∼ 10 ^20 cm ^−2 , in the local Universe ( z < 0.2) using XMM-Newton and Swift/XRT observations. The luminositi
Externí odkaz:
https://doaj.org/article/673430063e9c43c2970df0e93d52220f
Autor:
Ankan Das, Milan Sil, Rana Ghosh, Prasanta Gorai, Soutan Adak, Subhankar Samanta, Sandip K. Chakrabarti
Publikováno v:
Frontiers in Astronomy and Space Sciences, Vol 8 (2021)
The abundance of interstellar ice constituents is usually expressed with respect to the water ice because, in denser regions, a significant portion of the interstellar grain surface would be covered by water ice. The binding energy (BE) or adsorption
Externí odkaz:
https://doaj.org/article/875c9c31c1104d8bb7b2c463d6ae5e28
Autor:
Soujan Ghosh, Suman Chakraborty, Sudipta Sasmal, Tamal Basak, Sandip K. Chakrabarti, Anjan Samanta
Publikováno v:
Geomatics, Natural Hazards & Risk, Vol 10, Iss 1, Pp 1596-1612 (2019)
We present perturbations in very low frequency (VLF) signals received at Ionospheric & Earthquake Research Centre (IERC) (Lat. 22.50N, Long. 87.48E) during and prior to two earthquakes, one on 11 March 2011 at 11:16:24 LT (M = 9) in Honshu, Japan and
Externí odkaz:
https://doaj.org/article/2b68e6216e9947128b745422b9e02f87
Autor:
Soujan Ghosh, Swati Chowdhury, Subrata Kundu, Sudipta Sasmal, Dimitrios Z. Politis, Stelios M. Potirakis, Masashi Hayakawa, Suman Chakraborty, Sandip K. Chakrabarti
Publikováno v:
Entropy, Vol 24, Iss 1, p 23 (2021)
We focus on the possible thermal channel of the well-known Lithosphere–Atmosphere–Ionosphere Coupling (LAIC) mechanism to identify the behavior of thermal anomalies during and prior to strong seismic events. For this, we investigate the variation
Externí odkaz:
https://doaj.org/article/30eb03db3b184dfdb01fadf8deb20200
Autor:
Sudipta Sasmal, Swati Chowdhury, Subrata Kundu, Dimitrios Z. Politis, Stelios M. Potirakis, Georgios Balasis, Masashi Hayakawa, Sandip K. Chakrabarti
Publikováno v:
Atmosphere, Vol 12, Iss 8, p 1059 (2021)
We present a comprehensive analysis of pre-seismic anomalies as computed from the ground and space-based techniques during the recent Samos earthquake in Greece on 30 October 2020, with a magnitude M = 6.9. We proceed with a multi-parametric approach
Externí odkaz:
https://doaj.org/article/831d8bc24d2e4aaeb277d98d675837b5
Autor:
Arghajit Jana, Jie-Rou Shang, Dipak Debnath, Sandip K. Chakrabarti, Debjit Chatterjee, Hsiang-Kuang Chang
Publikováno v:
Galaxies, Vol 9, Iss 2, p 39 (2021)
The 2015 Outburst of V404 Cygni is an unusual one with several X-ray and radio flares and rapid variation in the spectral and timing properties. The outburst occurred after 26 years of inactivity of the black hole. We study the accretion flow propert
Externí odkaz:
https://doaj.org/article/1564b24fe834492fb55a13eaf2f71aa7
Autor:
Debjit Chatterjee, Arghajit Jana, Kaushik Chatterjee, Riya Bhowmick, Sujoy Kumar Nath, Sandip K. Chakrabarti, A. Mangalam, Dipak Debnath
Publikováno v:
Galaxies, Vol 9, Iss 2, p 25 (2021)
We study the properties of the faint X-ray activity of Galactic transient black hole candidate XTE J1908+094 during its 2019 outburst. Here, we report the results of detailed spectral and temporal analysis during this outburst using observations from
Externí odkaz:
https://doaj.org/article/04df7c4848044dc985c763540b6ad3e5
Publikováno v:
Proceedings, Vol 17, Iss 1, p 8 (2019)
X-ray time lags are complicated in nature. The exact reasons for complex lag spectra are as yet unknown. However, the hard lags, in general, are believed to be originated due to inverse Comptonization process. However, the origin of soft lags remaine
Externí odkaz:
https://doaj.org/article/216d1a9fbc8247b7ae9442b85c95a793
Publikováno v:
Experimental Astronomy.