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10 papers · 1 filter
A Search for X-ray/UV Correlation in the Reflection-Dominated Seyfert 1 Galaxy Mrk 1044
Samuzal Barua, Oluwashina K. Adegoke, Ranjeev Misra +3
Correlated variability between coronal X-rays and disc optical/UV photons provides a very useful diagnostic of the interplay between the different regions around an active galactic…
Correlated variability of the reflection fraction with the X-ray flux and spectral index for Mkn 478
Samuzal Barua, V. Jithesh, Ranjeev Misra +2
The X-ray spectrum of Mkn 478 is known to be dominated by a strong soft excess which can be described using relativistic blurred reflection. Using observations from {\it XMM-Newton…
Evidence for coronal temperature variation in Seyfert 2 ESO 103--035 using NuSTAR observations
Samuzal Barua, V. Jithesh, Ranjeev Misra +4
We report flux-resolved spectroscopic analysis of the active galactic nucleus (AGN) ESO 103--035 using \textit{NuSTAR} observations. Following an earlier work, we fit the spectra u…
NuSTAR observation of Ark 564 reveals the variation of coronal temperature with flux
Samuzal Barua, V. Jithesh, Ranjeev Misra +3
The hard X-ray spectral index of some AGN has been observed to steepen with the source flux. This has been interpreted in a Comptonization scenario, where an increase in the soft f…
Broad-band spectral study of X-ray transient MAXI J1820+070 using Swift/XRT and NuSTAR
Priya Bharali, Jaiverdhan Chauhan, Kalyanee Boruah
We report on a \textit{NuSTAR} and \textit{Swift}/XRT observation of the newly discovered X-ray transient MAXI J1820+070. \textit{Swift}/XRT and \textit{NuSTAR} have concurrently o…
Re-awakening of GRS 1716--249 after 23 years, observed by {\it Swift}/XRT and {\it NuSTAR}
Priya Bharali, Sunil Chandra, Jaiverdhan Chauhan +4
In this work, we present a spectral and temporal analysis of {\it Swift}/XRT and {\it NuSTAR} observations of GRS 1716--249 during its recent 2016--2017 outburst. This low mass X-r…