Search Publications
New measurements of the cyclotron line energy in Cen X-3
Paul, Biswajit; Pradhan, Pragati; Tomar, Gunjan
We report results from the analysis of data from two observations of the accreting binary X-ray pulsar Cen X-3 carried out with the broad-band X-ray observatories Suzaku and NuSTAR. The pulse profile is dominated by a broad single peak and show some energy dependence with two additional weak pulse peaks at energies below 15 and 25 keV, respectivel…
Long-term X-ray observations of seyfert 1 galaxy ark 120: on the origin of soft-excess
Chatterjee, Arka; Nandi, Prantik; Chakrabarti, Sandip K. +1 more
We present the long-term X-ray spectral and temporal analysis of a 'bare-type AGN' Ark 120. We consider the observations from XMM-Newton, Suzaku, Swift, and NuSTAR from 2003 to 2018. The spectral properties of this source are studied using various phenomenological and physical models present in the literature. We report (a) the variations of sever…
Joint Suzaku and Chandra observations of the MKW4 galaxy group out to the virial radius
Kraft, Ralph; Gastaldello, Fabio; Sarkar, Arnab +5 more
We present joint Suzaku and Chandra observations of MKW4. With a global temperature of 1.6 keV, MKW4 is one of the smallest galaxy groups that have been mapped in X-rays out to the virial radius. We measure its gas properties from its centre to the virial radius in the north, east, and north-east directions. Its entropy profile follows a power law…
Application of a new X-ray reflection model to V1223 Sagittarii
Ishida, Manabu; Hayashi, Takayuki; Kitaguchi, Takao
In intermediate polars (IPs), the intrinsic thermal emissions from white dwarfs (WDs) have typically been studied. Few reports have analysed X-ray reflections from WDs. We recently developed an elaborate IP-reflection spectral model. Herein, we report the first application of a reflection model with an IP thermal model to the spectra of the bright…
Comprehensive broad-band study of accreting neutron stars with Suzaku: Is there a bi-modality in the X-ray spectrum?
Maitra, Chandreyee; Paul, Biswajit; Pradhan, Pragati +2 more
We present a broad-band spectral analysis of accreting neutron stars using data from XIS and PIN onboard Suzaku. From spectral fits of these sources with a single continuum model including a power law and high energy cut-off, cyclotron lines (where required), we studied the correlation between various spectral parameters. Among 39 sources we studi…