The Galactic Distribution of Black Hole Candidates in Low-Mass X-Ray Binary Systems | Zendy

N. E. White | Zendy; J. van Paradijs | Zendy

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The Galactic Distribution of Black Hole Candidates in Low-Mass X-Ray Binary Systems

Author(s) -

N. E. White,

J. van Paradijs

Publication year - 1996

Publication title -

the astrophysical journal

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 2.376

H-Index - 489

eISSN - 1538-4357

pISSN - 0004-637X

DOI - 10.1086/310380

Subject(s) - physics , astrophysics , velocity dispersion , neutron star , black hole (networking) , galaxy , stellar black hole , galactic plane , x ray binary , dispersion (optics) , binary black hole , astronomy , solar mass , gravitational wave , optics , computer network , routing protocol , routing (electronic design automation) , computer science , link state routing protocol

We find that for black hole candidates (BHC) in low-mass X-ray binaries (LMXRB) the dispersion of their distances,z, to the Galactic plane is smaller than for LMXRB with neutron stars by more than a factor 2. This result indicates that any kick velocities that the black hole systems may have received at formation are substantially smaller than those of neutron star systems. We infer a value of 40 km s 21 for the radial-velocity dispersion of the BHC systems from their z dispersion, consistent with the value obtained directly from radial-velocity measurements. From the surface density of black hole X-ray transients (BHXT) in the solar vicinity, and an estimate for the typical recurrence time of1100 yr, we infer that the total number of BHXT in the Galaxy is1500. Subject headings: binaries: close—galaxy: kinematics and dynamics—X-rays: general

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