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

Abstract

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 {\it 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 soft-intermediate) spectral state during this short period of the X-ray activity. We notice a faint but broad Fe K$\alpha$ emission line at around 6.5 keV. We also estimate the probable mass of the black hole to be $6.5_{-0.7}^{+0.5}{M}_{\odot }$ with 90\% confidence.

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• Accretion Flow Properties of MAXI J1910-057/Swift J1910.2-0546 During Its 2012-13 Outburst
• Global Accretion Properties of Black Hole X-Ray Binaries: A Phenomenological Perspective
• AstroSat Observation of Non-Resonant Type-C QPOs in MAXI J1535-571
• The Spin and Orientation of the Black Hole in XTE J1908$+$094