166 citations · 1.4k across the 48 of their papers we have counts for
8 papers · 1 filter
Complex Optical/UV and X-ray Variability of the Seyfert 1 galaxy 1H 0419-577
Main Pal, Gulab C. Dewangan, Ajit K. Kembhavi +2
We present detailed broadband UV/optical to X-ray spectral variability of the Seyfert 1 galaxy 1H 0419-577 using six XMM-Newton observations performed during 2002-2003. These obser…
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…
Broadband X-ray emission and the reality of the broad iron line from the Neutron Star - White Dwarf X-ray binary 4U 1820-30
Aditya S. Mondal, Gulab C. Dewangan, Mayukh Pahari +3
Broad relativistic iron lines from neutron star X-ray binaries are important probes of the inner accretion disk. The X-ray reflection features can be weakened due to strong magneti…
UV and X-Ray Variability of the Narrow-Line Seyfert 1 Galaxy Ark 564
Savithri H. Ezhikode, Gulab C. Dewangan, Ranjeev Misra +3
We analyse eight XMM-Newton observations of the bright Narrow-Line Seyfert 1 galaxy Arakelian 564 (Ark 564). These observations, separated by ~6 days, allow us to look for correlat…
Warm absorbers in X-rays (WAX), a comprehensive high resolution grating spectral study of a sample of Seyfert galaxies: I. A global view and frequency of occurrence of warm absorbers
Sibasish Laha, Matteo Guainazzi, Gulab C. Dewangan +2
We present results from a homogeneous analysis of the broadband 0.3-10 keV CCD resolution as well as of soft X-ray high-resolution grating spectra of a hard X-ray flux-limited samp…
On the origin of the featureless soft X-ray excess emission from the Seyfert 1 galaxy ESO~198--G24
Sibasish Laha, Gulab C. Dewangan, Ajit K. Kembhavi
We present medium and high resolution X-ray spectral study of a Seyfert 1 galaxy ESO~198--G24 using a long (122 ks) XMM-Newton observation performed in February 2006. The source ha…