18 citations · 65 across the 13 of their papers we have counts for
9 papers · 1 filter
X-ray polarization in magnetized neutron stars
Tanuman Ghosh, Shiv Sethi
X-ray polarimetry has opened a new window into understanding the physics around magnetized compact objects. IXPE detection of linear polarization from such systems has prompted a n…
Synchrotron radiation from NGC 470 HLX1 - a hidden hyperluminous accreting neutron star?
Tanuman Ghosh, Shiv Sethi, Gulab Chand Dewangan +3
We present the first broadband spectral analysis of NGC 470 HLX1, a hyperluminous X-ray source that exhibits significant flux variability over different epochs. We investigate the…
Probing spectral variability in NGC 4490 ULX-8 over 24 years of XMM-Newton, Chandra and Swift-XRT observations
Tarang Vashisht, Aru Beri, Tanuman Ghosh +2
We present a spectral variability study of the ultraluminous X-ray source NGC 4490 ULX-8 based on 14 Chandra, 6 XMM-Newton and 19 Swift-XRT observations obtained between 2000 and 2…
A Study of Spectral Variability between flaring and non-flaring state in M74 X-1
Aman Upadhyay, Tanuman Ghosh, Vikram Rana
We conducted an extensive long-term spectral and timing study of the ultraluminous X-ray source (ULX) M74 X-1, using data taken between 2001 and 2021 by Chandra and XMM-Newton X-ra…
Constraint on the accretion of NGC 6946 X-1 using broadband X-ray data
Tanuman Ghosh, Vikram Rana
We analyze broadband X-ray data of NGC 6946 X-1 and probe plausible accretion scenarios in this ULX. NGC 6946 X-1 is a persistent soft source with broadband continuum spectra descr…
Spectral variability in NGC 1042 ULX1
Tanuman Ghosh, Vikram Rana
We report X-ray spectral variability in an ultraluminous X-ray source NGC 1042 ULX1, using archival XMM-Newton and recent NuSTAR observations. In long-term evolution, the source ha…
Synchrotron cutoff in Ultraluminous X-ray sources
Tanuman Ghosh, Shiv Sethi, Vikram Rana
The origin of spectral curvature at energies keV in ultraluminous X-ray sources is not well understood. In this paper, we propose a novel mechanism based on synchrotro…
Hard X-ray flares and spectral variability in NGC 4395 ULX1
Tanuman Ghosh, Vikram Rana, Matteo Bachetti
We report the detection of flaring events in NGC 4395 ULX1, a nearby ultraluminous X-ray source (ULX), for the first time, using recent XMM-NEWTON observations. The flaring episode…
Super-Eddington accretion onto a stellar mass ultraluminous X-ray source NGC 4190 ULX1
Tanuman Ghosh, Vikram Rana
We present the results of high-quality XMM-NEWTON observations of a ULX in the galaxy NGC 4190. The detection of spectral cutoff in NGC 4190 ULX1 spectra rules out the interpretati…