Zobrazeno 1 - 10
of 479
pro vyhledávání: '"Agrawal Vivek"'
Autor:
Bharathan, Athira M., Stalin, C. S., Sahayanathan, S., Wani, Kiran, Mandal, Amit Kumar, Chatterjee, Rwitika, Joshi, Santosh, Pandey, Jeewan C, Mathew, Blesson, Agrawal, Vivek K.
We present near-simultaneous X-ray and optical polarization measurements in the high synchrotron peaked (HSP) blazar Mrk 421. The X-ray polarimetric observations were carried out using {\it Imaging X-ray Polarimetry Explorer} ({\it IXPE}) on 06 Decem
Externí odkaz:
http://arxiv.org/abs/2409.16745
We present the spectral and timing analyses of \textit{AstroSat} observations of the Black Hole X-ray Binary GX 339-4 when the source was close the peak of the outburst in 2024. We find that both the spectral and timing variability of the source is i
Externí odkaz:
http://arxiv.org/abs/2405.06090
Autor:
P, Shyam Prakash V, Agrawal, Vivek K.
We present the spectral and timing study of the bright NS-LMXB GX 5-1 using \textit{\textit{AstroSat}/LAXPC} and \textit{SXT} observations conducted in the year 2018. During the observation, the source traces out the complete HB and NB of the Z-track
Externí odkaz:
http://arxiv.org/abs/2404.02782
Publikováno v:
Publ. Astron. Soc. Aust. 41 (2024) e072
We conducted a study on the X-ray polarization properties of MCG-5-23-16 by analyzing long-term monitoring data from {\it NuSTAR} jointly with {\it IXPE} observations made in May and November 2022. The re-analysis of {\it IXPE} data gives model-depen
Externí odkaz:
http://arxiv.org/abs/2403.14169
Autor:
Agrawal, Vivek K.
AstroSat observed transient neutron star low-mass X-ray binary XTE J1701-462 for a total duration of 135 ks during its 2022 outburst. The source traced a complete 'Z' shaped structure in the hardness intensity diagram (HID) during the observation. Th
Externí odkaz:
http://arxiv.org/abs/2403.07634
Autor:
Bharathan, Athira M., Stalin, C. S., Chatterjee, Rwitika, Sahayanathan, S., Pal, Indrani, Mathew, Blesson, Agrawal, Vivek K.
We report the measurement of X-ray polarization in the high synchrotron peaked blazar 1ES 1959+650. Of the four epochsof observations from the {\it Imaging X-ray Polarimetry Explorer}, we detected polarization in the 2$-$8 keV band on two epochs. Fro
Externí odkaz:
http://arxiv.org/abs/2311.01745
We present a comprehensive spectro-temporal analysis of five ultraluminous X-ray sources (ULXs) with central object likely being a black hole, using archival {\it XMM-Newton} observations. These sources, namely NGC 1313 X-1, NGC 5408 X-1, NGC 6946 X-
Externí odkaz:
http://arxiv.org/abs/2309.11182
X-ray polarization observations of IC 4329A with IXPE: Constraining the geometry of the X-ray corona
X-ray polarimetry is a powerful tool to probe the geometry of the hot X-ray corona in active galactic nuclei (AGN). Here, we present our results on the characterisation of the X-ray polarization of the radio-quiet Seyfert-type AGN IC 4329A at a redsh
Externí odkaz:
http://arxiv.org/abs/2305.09365
We present a detailed spectro-polarimetric study of Black hole X-ray binary 4U $1630-47$ during its $2022$ outburst with IXPE and NICER observations. The source is observed in disk dominated thermal state (kT$_{in}\approx1.4$ keV) with clear detectio
Externí odkaz:
http://arxiv.org/abs/2303.05462
Publikováno v:
Monthly Notices of the Royal Astronomical Society, Volume 525, Issue 3, November 2023, Pages 4657-4662
In this paper, we performed a spectro-polarimetric analysis of the transient NS-LMXB XTE J1701-462 using IXPE, NICER, and NuSTAR data during its 2022 outburst. We report the significant detection of energy-dependent polarization in the X-ray signal f
Externí odkaz:
http://arxiv.org/abs/2302.03396