103 citations · 266 across the 11 of their papers we have counts for
9 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…
Long-term optical and ray variability of the blazar PKS~1222+216
Savithri H. Ezhikode, Amit Shukla, Gulab C. Dewangan +4
The ray emission from flat-spectrum radio quasars (FSRQs) is thought to be dominated by the inverse Compton scattering of the external sources of photon fields, e.g., accretion…
Strong Soft X-ray Excess in 2015 XMM-Newton Observation of BL--Lac OJ~287
Main Pal, Pankaj Kushwaha, Gulab C. Dewangan +1
We report a strong soft X-ray excess in the BL--Lacartae -ray blazar OJ~287 during the long exposure in May 2015, amongst two of the latest \xmm~{} observations performed in May…
UV to X-ray Comptonization delay in Mrk 493
Oluwashina Adegoke, Gulab C. Dewangan, Pramod Pawar +1
The broadband X-ray emission from type 1 active galactic nuclei, dominated by a powerlaw continuum, is thought to arise from repeated inverse Compton scattering of seed optical/UV…
Complex UV/X-ray variability of 1H~0707-495
P. K. Pawar, G. C. Dewangan, I. E. Papadakis +3
We study the relationship between the UV and X-ray variability of the narrow-line Seyfert 1 galaxy 1H~0707-495. Using a year long {\it Swift} monitoring and four long {\it XMM-Newt…
AstroSat CZT Imager observations of GRB 151006A: timing, spectroscopy, and polarisation study
A. R. Rao, Vikas Chand, M. K. Hingar +24
AstroSat is a multi-wavelength satellite launched on 2015 September 28. The CZT Imager of AstroSat on its very first day of operation detected a long duration gamma-ray burst (GRB)…
On the reality of broad iron L lines from the narrow line Seyfert 1 galaxies 1H0707-495 and IRAS 13224-3809
Pramod Pawar, Gulab Dewangan, Madhav Patil +2
We performed time resolved spectroscopy of 1H0707-495 and IRAS 13224-3809 using long XMM-Newton observations. These are strongly variable narrow line Seyfert 1 galaxies and show br…
X-ray/UV variability and the origin of soft X-ray excess emission from II Zw 177
Main Pal, Gulab C. Dewangan, Ranjeev Misra +1
We study X-ray and UV emission from the narrow-line Seyfert 1 galaxy II~Zw~177 using a $137\ks$ long and another $13\ks$ short \xmm{} observation performed in 2012 and 2001, respec…
Constraining distance and inclination angle of V4641 Sgr using and observations during low soft spectral state
Mayukh Pahari, Ranjeev Misra, Gulab C Dewangan +1
We present results from and /XRT joint spectral analysis of V4641 Sgr during a disk dominated or soft state as well as a powerlaw dominated or hard stat…