The galactic distribution of low-mass x-ray binaries

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X-Ray Binaries, Neutron Stars, Stellar Content And Populations, Morphology And Overall Structure

Scientific paper

I will discuss the galactic distribution of low-mass binaries in which the accreting compact object is a neutron star. The r.m.s. value of their distances, z, to the galactic plane is ~1 kpc. This wide z distribution cannot be explained by systematic velocities that increased as a result of sudden mass loss at the formation of the neutron star alone. Kick velocities imparted on the neutron star, according to the radio pulsar velocity distribution recently derived by Lyne and Lorimer can account for the LMXB z distribution. This distribution is consistent with formation of neutron stars in LMXBs from direct collapse of a helium star, and also from accretion induced collapse of a white dwarf. The triple-star evolutionary scenario proposed by Eggleton and verbunt can only produce a minor fraction of the LMXB. A side result of the above work is the conclusion that if gamma-ray bursts are caused by neutron star mergers one would expect the location distribution of these events to be enhanced near (the bigger) galaxies.

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