Zobrazeno 1 - 9
of 9
pro vyhledávání: '"Swadesh Chand"'
Autor:
Andrzej A. Zdziarski, Swadesh Chand, Srimanta Banerjee, Michał Szanecki, Agnieszka Janiuk, Piotr Lubiński, Andrzej Niedźwiecki, Gulab Dewangan, Ranjeev Misra
Publikováno v:
The Astrophysical Journal Letters, Vol 967, Iss 1, p L9 (2024)
We perform a detailed study of the black hole spin of Cyg X-1, using accurate broadband X-ray data obtained in the soft spectral state by simultaneous NICER and NuSTAR observations, supplemented at high energies by INTEGRAL data. We use the relativis
Externí odkaz:
https://doaj.org/article/465a96034a854ebb9192841dd49b2edd
Autor:
Pragati Sahu, Swadesh Chand, Parijat Thakur, G. C. Dewangan, V. K. Agrawal, Prakash Tripathi, Subhashish Das
Publikováno v:
The Astrophysical Journal, Vol 975, Iss 2, p 165 (2024)
We perform a comprehensive timing and broadband spectral analysis using an AstroSat observation of the low-mass black hole X-ray binary H 1743–322 during its 2017 outburst. Additionally, we use two Swift/XRT observations, one of which is simultaneo
Externí odkaz:
https://doaj.org/article/bf4022537c76432dada6159b587dcfd8
Autor:
Swadesh Chand, Gulab C. Dewangan, Andrzej A. Zdziarski, Dipankar Bhattacharya, N. P. S. Mithun, Santosh V. Vadawale
Publikováno v:
The Astrophysical Journal, Vol 972, Iss 1, p 20 (2024)
We perform broadband (0.7–100 keV) spectral analysis of five hard state observations of the low-mass black hole X-ray binary GX 339–4 taken by AstroSat during the rising phase of three outbursts from 2019 to 2022. We find that the outburst in 202
Externí odkaz:
https://doaj.org/article/17ae9cb4ecc645fb90ae84e1597f1aa1
Autor:
Andrzej A. Zdziarski, Srimanta Banerjee, Swadesh Chand, Gulab Dewangan, Ranjeev Misra, Michał Szanecki, Andrzej Niedźwiecki
Publikováno v:
The Astrophysical Journal, Vol 962, Iss 2, p 101 (2024)
The black hole spin parameter, a _* , was measured to be close to its maximum value of 1 in many accreting X-ray binaries. In particular, a _* ≳ 0.9 was found in a number of studies of LMC X-1. These measurements were claimed to take into account b
Externí odkaz:
https://doaj.org/article/434a11dfb814482db6daebc3008649b9
AstroSat view of the newly discovered X-ray transient MAXI~J1803--298 in the Hard-intermediate state
We perform comprehensive temporal and spectral analysis of the newly discovered X-ray transient MAXI~J1803--298 using an AstroSat target of opportunity observation on May 11, 2021 during its outburst. The source was found to be in the hard intermedia
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::eda4c57c2a7061c3afadc32b610e1f53
http://arxiv.org/abs/2112.03556
http://arxiv.org/abs/2112.03556
Publikováno v:
Journal of Astrophysics and Astronomy. 42
We present the detection of type C quasi-periodic oscillation (QPO) along with upper harmonic at respective frequencies of $\sim0.6$ Hz and $\sim1.2$ Hz in the single AstroSat observation taken during the 2016 outburst of the low-mass black hole X-ra
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::05e7e9d45b30df602a26bb3fe1ebe73b
https://doi.org/10.1007/s12036-020-09688-x
https://doi.org/10.1007/s12036-020-09688-x
Autor:
D. K. Sahu, Vineet Kumar Mannaday, Jianghui Ji, Zhao Sun, Swadesh Chand, Devesh P. Sariya, V. V. Moskvin, Ing-Guey Jiang, Li-Chin Yeh, D. Bisht, Li-Hsin Su, David Mkrtichian, A. A. Shlyapnikov, Parijat Thakur, Tze-En Chang, Evgeny Griv, Vladimir Ignatov
Considering the importance of investigating the transit timing variations (TTVs) of transiting exoplanets, we present a follow-up study of HAT-P-12b. We include six new light curves observed between 2011 and 2015 from three different observatories, i
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::876b27baf583873929bba36072923350
http://arxiv.org/abs/2012.08820
http://arxiv.org/abs/2012.08820
Autor:
Parijat Thakur, Devesh P. Sariya, Li-Hsin Su, A. A. Shlyapnikov, Li-Chin Yeh, Swadesh Chand, Vineet Kumar Mannaday, Chiao-Yu Lee, David Mkrtichian, Vladimir Ignatov, Ing-Guey Jiang, Evgeny Griv, V. V. Moskvin, D. K. Sahu
Motivated by the unsettled conclusion on whether there are any transit timing variations (TTVs) for the exoplanet Qatar-1b, 10 new transit light curves are presented and the TTV analysis with a baseline of 1400 epochs are performed. Because the linea
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::13d1cafc0f5c231ee308a2cc6d39c817
http://arxiv.org/abs/2012.08184
http://arxiv.org/abs/2012.08184
Publikováno v:
The Astrophysical Journal. 893:142
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::b287ca9799c7ebd94ebfd84e5f352ae8
https://doi.org/10.3847/1538-4357/ab829a
https://doi.org/10.3847/1538-4357/ab829a