4.7 Article

The Novel Obscured State of the Stellar-mass Black Hole GRS 1915+105

期刊

ASTROPHYSICAL JOURNAL
卷 909, 期 1, 页码 -

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IOP PUBLISHING LTD
DOI: 10.3847/1538-4357/abd6cb

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X-ray binary stars; X-ray astronomy; Accretion; Stellar mass black holes; Low-mass x-ray binary stars

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GRS 1915+105 is a stellar-mass black hole known for its diverse X-ray variability, which entered a new accretion state in early 2019, resulting in a significant decrease in flux. The new state is characterized by internal obscuration and reduced mass accretion rate, with implications for black holes across different mass scales.
GRS 1915+105 is a stellar-mass black hole that is well known for exhibiting at least 12 distinct classes of X-ray variability and correlated multi-wavelength behavior. Despite such extraordinary variability, GRS 1915+105 remained one of the brightest sources in the X-ray sky. However, in early 2019, the source became much fainter, apparently entering a new accretion state. Here, we report the results of an extensive, year-long monitoring campaign of GRS 1915+105 with the Neil Gehrels Swift Observatory. During this interval, the flux of GRS 1915+105 gradually diminished; the observed count rate eventually dropped by two orders of magnitude. Simple but robust spectral fits to these monitoring observations show that this new state results from the combination of a dramatic and persistent increase in internal obscuration, and a reduced mass accretion rate. The internal obscuration is the dominant effect, with a median value of N-H = 7 x 10(23) cm(-2). In a number of observations, the source appears to be Compton-thick. We suggest that this state should be identified as the obscured state, and discuss the implications of this new (or rarely observed) accretion mode for black holes across the mass scale.

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