Zobrazeno 1 - 10
of 98
pro vyhledávání: '"Chatterjee, Ritaban"'
Autor:
Das, Susmita, Chatterjee, Ritaban
Publikováno v:
MNRAS 524, 3797-3808 (2023)
We study simultaneous soft ($0.7 - 7$ keV) and hard ($7 - 20$ keV) X-ray light curves at a total of eight epochs during $2016 - 2019$ of two TeV blazars Mrk 421 and 1ES 1959+650 observed by the SXT and LAXPC instruments onboard AstroSat. The light cu
Externí odkaz:
http://arxiv.org/abs/2307.09336
Autor:
Rajguru, Garima, Chatterjee, Ritaban
Publikováno v:
Physical Review D, 106(6), p.063001 (2022)
We present the results of studying the accretion disk vs jet power for a large fraction of all the blazars detected by the Fermi Gamma-Ray Space Telescope. The disk power is inferred from the emission line luminosities obtained from published results
Externí odkaz:
http://arxiv.org/abs/2209.12264
Autor:
Ghosh, Ritesh, Laha, Sibasish, Deshmukh, Kunal, Bhalerao, Varun, Dewangan, Gulab C., Chatterjee, Ritaban
We have studied the nature and origin of the soft X-ray excess detected in the interesting changing-look AGN (CLAGN) Mrk~590 using two decades of multi-wavelength observations from \xmm{}, \suzaku{}, \swift{} and \nustar{}. In the light of vanishing
Externí odkaz:
http://arxiv.org/abs/2208.04067
It is well-known that the $\gamma$-ray emission in blazars originate in the relativistic jet pointed at the observers. However, it is not clear whether the exact location of the GeV emission is less than a pc from the central engine, such that it may
Externí odkaz:
http://arxiv.org/abs/2206.14952
Recent analysis of blazar variability has revealed a proportionality between the mean flux and the root mean squared (rms) fluctuations about the mean flux. Although such rms-flux relation has been previously observed in the accretion disc/corona var
Externí odkaz:
http://arxiv.org/abs/2112.11519
Autor:
Chatterjee, Ritaban, Das, Susmita, Khasnovis, Archishman, Ghosh, Ritesh, Kumari, Neeraj, Naik, Sachindra, Larionov, V. M., Grishina, T. S., Kopatskaya, E. N., Larionova, E. G., Nikiforova, A. A., Morozov, D. A., Savchenko, S. S., Troitskaya, Yu. V., Troitsky, I. S., Vasilyev, A. A.
Publikováno v:
J. Astrophys. Astr. (2021) 42:80
We study the multi-wavelength variability of the blazar Mrk 421 at minutes to days timescales using simultaneous data at $\gamma$-rays from Fermi, 0.7-20 keV energies from AstroSat, and optical and near-infrared (NIR) wavelengths from ground-based ob
Externí odkaz:
http://arxiv.org/abs/2102.00919
Half of the 2020 Nobel Prize is awarded for discovering a super-massive black hole at the centre of our Galaxy. One of the first indications of the existence of a black hole at the centre of a galaxy was found by Jennison and Das Gupta in 1953 while
Externí odkaz:
http://arxiv.org/abs/2012.01001
Publikováno v:
ApJ 897 (2020) 25
We analyze X-ray light curves of the blazars Mrk 421, PKS 2155-304, and 3C 273 using observations by the Soft X-ray Telescope on board AstroSat and archival XMM-Newton data. We use light curves of length 30-90 ks each from 3-4 epochs for all three bl
Externí odkaz:
http://arxiv.org/abs/2005.05230
Autor:
Majumder, Anwesh, Mitra, Kaustav, Chatterjee, Ritaban, Urry, C. M., Bailyn, C. D., Nandi, Prantik
We present cross-correlation studies of gamma-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 pro
Externí odkaz:
http://arxiv.org/abs/1909.05157
The power spectral density (PSD) of the X-ray emission variability from the accretion disc-corona region of black hole X-ray binaries and active galactic nuclei has a broken power law shape with a characteristic break time-scale. If the disc and the
Externí odkaz:
http://arxiv.org/abs/1904.03740