SIMBAD references

2016ApJ...825...10T - Astrophys. J., 825, 10-10 (2016/July-1)

The first low-mass black hole X-ray binary identified in quiescence outside of a globular cluster.

TETARENKO B.E., BAHRAMIAN A., ARNASON R.M., MILLER-JONES J.C.A., REPETTO S., HEINKE C.O., MACCARONE T.J., CHOMIUK L., SIVAKOFF G.R., STRADER J., KIRSTEN F. and VLEMMINGS W.

Abstract (from CDS):

The observed relation between the X-ray and radio properties of low-luminosity accreting black holes (BHs) has enabled the identification of multiple candidate black hole X-ray binaries (BHXBs) in globular clusters (GCs). Here, we report an identification of the radio source VLA J213002.08+120904 (aka M15 S2), recently reported in Kirsten et al., as a BHXB candidate. They showed that the parallax of this flat-spectrum variable radio source indicates a {2.2}_{-0.3}^{+0.5} kpc distance, which identifies it as lying in the foreground of the GC M15. We determine the radio characteristics of this source and place a deep limit on the X-ray luminosity of ∼4 x 1029 erg/s. Furthermore, we astrometrically identify a faint red stellar counterpart in archival Hubble images with colors consistent with a foreground star; at 2.2 kpc, its inferred mass is 0.1-0.2 M. We rule out that this object is a pulsar, neutron star X-ray binary, cataclysmic variable, or planetary nebula, concluding that VLA J213002.08+120904 is the first accreting BHXB candidate discovered in quiescence outside of a GC. Given the relatively small area over which parallax studies of radio sources have been performed, this discovery suggests a much larger population of quiescent BHXBs in our Galaxy, 2.6 x 104-1.7 x 108 BHXBs at 3σ confidence, than has been previously estimated (∼102-104) through population synthesis.

Abstract Copyright: © 2016. The American Astronomical Society. All rights reserved.

Journal keyword(s): black hole physics - radio continuum: general - stars: individual: VLA J213002.08+120904 - X-rays: binaries

Status at CDS:   Examining the need for a new acronym.

Simbad objects: 19

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2020.05.26-23:56:11

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