Zobrazeno 1 - 10
of 18
pro vyhledávání: '"Prantik Nandi"'
Autor:
Birendra Chhotaray, Gaurava K. Jaisawal, Prantik Nandi, Sachindra Naik, Neeraj Kumari, Mason Ng, Keith C. Gendreau
Publikováno v:
The Astrophysical Journal, Vol 963, Iss 2, p 132 (2024)
We present the results obtained from detailed X-ray timing and spectral studies of X-ray pulsar Swift J0243.6+6124 during its giant and normal X-ray outbursts between 2017 and 2023 observed by the Neutron star Interior Composition Explorer (NICER). W
Externí odkaz:
https://doaj.org/article/c6b08266771745609328a8151834b8d5
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
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
We performed a detailed broadband spectral and timing analysis of a small flaring event of ~120 ks in a narrow-line Seyfert 1 galaxy NGC 4051 using simultaneous XMM-Newton and NuSTAR observations. The ~300 ks long NuSTAR observation and the overlappi
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::4e961f9aececce80fe379fcc8fcb7216
http://arxiv.org/abs/2303.11799
http://arxiv.org/abs/2303.11799
Autor:
Arghajit Jana, Claudio Ricci, Sachindra Naik, Atsushi Tanimoto, Neeraj Kumari, Hsiang-Kuang Chang, Prantik Nandi, Arka Chatterjee, Samar Safi-Harb
Publikováno v:
Monthly Notices of the Royal Astronomical Society. 512:5942-5959
We present a detailed study of the highly obscured active galaxy NGC 4507, performed using four Nuclear Spectroscopic Telescope Array (NuSTAR) observations carried out between May and August in 2015 (~ 130 ks in total). Using various phenomenological
We attempt to present a multiwavelength variability and correlation study as well as detailed multi-waveband spectral characteristics of the May 2021 $\gamma$-ray flare of the blazar source TXS 1700+685. The multi-wavelength observation from \textit{
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::5213a2598a73095896fda0b2f83e0074
Autor:
Anwesh Majumder, C. M. Urry, Kaustav Mitra, Ritaban Chatterjee, Prantik Nandi, Charles D. Bailyn
Publikováno v:
Monthly Notices of the Royal Astronomical Society. 490:124-134
We present cross-correlation studies of γ-ray (0.1–300 GeV), X-ray (0.2–10 keV), and optical (R band) variability of a sample of 26 blazars during 2008–2016. The light curves are from Fermi-LAT, Swift-XRT, and the Yale-SMARTS blazar monitoring
We present the long-term X-ray spectral and temporal analysis of a 'bare-type AGN' Ark 120. We consider the observations from XMM-Newton, Suzaku, Swift, and NuSTAR from 2003 to 2018. The spectral properties of this source are studied using various ph
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::9c797f2623ecd0e550e627e682371992
http://arxiv.org/abs/2101.08043
http://arxiv.org/abs/2101.08043
Autor:
Prantik Nandi, Arghajit Jana, Arka Chatterjee, Neeraj Kumari, Gaurava K. Jaisawal, Claudio Ricci, Sachindra Naik, Kimitake Hayasaki
Publikováno v:
Jana, A, Kumari, N, Nandi, P, Naik, S, Chatterjee, A, Jaisawal, G K, Hayasaki, K & Ricci, C 2021, ' Broad-band X-ray observations of the 2018 outburst of the changing-look active galactic nucleus NGC 1566 ', Monthly Notices of the Royal Astronomical Society, vol. 507, no. 1, pp. 687-703 . https://doi.org/10.1093/mnras/stab2155
We study the nature of the changing-look Active Galactic Nucleus NGC 1566 during its June 2018 outburst. During the outburst, the X-ray intensity of the source rises up to ~25-30 times compared to its quiescent state intensity. We perform timing and
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::ba6719aabcbae4addb2148fb113af9b3
We present the results obtained from a detailed X-ray timing and spectral analysis of Seyfert 2 galaxy NGC 6300 by using observations with the {\it Suzaku}, {\it Chandra} and {\it NuSTAR} observatories between 2007 and 2016. We calculate variance, rm
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::ab4b1f7e9f9c5f7775b00cbfe04ea293
http://arxiv.org/abs/2008.08033
http://arxiv.org/abs/2008.08033