Properties of Faint X-ray Activity of XTE J1908+094 in 2019

We study the properties of the faint X-ray activity of Galactic transient black hole candidate XTE J1908+094 during its 2019 outburst. Here, we report the results of detailed spectral and temporal analysis during this outburst using observations from Nuclear Spectroscopic Telescope Array (NuSTAR). W...

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Bibliographic Details
Published in:Galaxies 2021-06, Vol.9 (2), p.25
Main Authors: Chatterjee, Debjit, Jana, Arghajit, Chatterjee, Kaushik, Bhowmick, Riya, Nath, Sujoy Kumar, Chakrabarti, Sandip K., Mangalam, A., Debnath, Dipak
Format: Article
Language:English
Subjects:
accretion disks—shock waves—radiation:dynamics
Black holes
Data analysis
Emission lines
Light
Spectra
Spectroscopic telescopes
X-ray astronomy
X-rays
X-Rays:binaries—stars individual: (XTE J1908+094)—stars:black holes—accretion
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Summary:We study the properties of the faint X-ray activity of Galactic transient black hole candidate XTE J1908+094 during its 2019 outburst. Here, we report the results of detailed spectral and temporal analysis during this outburst using observations from Nuclear Spectroscopic Telescope Array (NuSTAR). We have not observed any quasi-periodic-oscillations (QPOs) in the power density spectrum (PDS). The spectral study suggests that the source remained in the softer (more precisely, in the soft–intermediate) spectral state during this short period of X-ray activity. We notice a faint but broad Fe Kα emission line at around 6.5 keV. We also estimate the probable mass of the black hole to be 6.5−0.7+0.5M⊙, with 90% confidence.
ISSN:2075-4434
2075-4434
DOI:10.3390/galaxies9020025