18 citations · 65 across the 13 of their papers we have counts for
13 papers
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…
A Green Pea starburst arising from a galaxy-galaxy merger
S. Purkayastha, N. Kanekar, J. N. Chengalur +3
Green Pea galaxies are low-redshift starburst dwarf galaxies, with properties similar to those of the high-redshift galaxies that reionized the Universe. We report the first mappin…
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…
Gravitational geometric phase
Banibrata Mukhopadhyay, Tanuman Ghosh, Soumya Kanti Ganguly
We show that spinors propagating in curved gravitational background acquire an interaction with spacetime curvature, which leads to a quantum mechanical geometric effect. This is s…
The Atomic Gas Mass of Green Pea Galaxies
N. Kanekar, T. Ghosh, J. Rhoads +4
We have used the Arecibo Telescope and the Green Bank Telescope to carry out a deep search for H{\sc i}~21\,cm emission from a large sample of Green Pea galaxies, yielding 19 detec…
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…
Geometric phase for Dirac Hamiltonian under gravitational fields in the non-relativistic regime
Tanuman Ghosh, Banibrata Mukhopadhyay
We show the appearance of geometric phase in a Dirac particle traversing in non-relativistic limit in a time-independent gravitational field. This turns out to be similar to the on…