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1999MNRAS.305..763B - Mon. Not. R. Astron. Soc., 305, 763-769 (1999/June-1)
The spatial distribution of coalescing neutron star binaries: implications for gamma-ray bursts.
BLOOM J.S., SIGURDSSON S. and POLS O.R.
Abstract (from CDS):
In a range of plausible galactic potentials (with Mgalaxy3x1010 M☉) the median radial offset of a NS-NS merger is less than 10 kpc. At a redshift of z=1 (with H0=65 km.s–1.Mpc–1 and Ω=0.2), this means that half the coalescences should occur within ∼1.3 arcsec from the host galaxy. In all but the most shallow potentials, 90 per cent of NS-NS binaries merge within 30 kpc of the host. We find that although the spatial distribution of coalescing neutron star binaries is consistent with the close spatial association of known optical afterglows of gamma-ray bursts (GRBs) with faint galaxies, a non-negligible fraction (∼15 per cent) of GRBs should occur well outside (30 kpc) dwarf galaxy hosts. Extinction owing to dust in the host, projection of offsets, and a range in interstellar medium densities confound the true distribution of NS-NS mergers around galaxies with an observable set of optical transients/galaxy offsets.
Abstract Copyright: 1999, Royal Astronomical Society
Journal keyword(s): relativity - binaries: general - stars: neutron - pulsars: general - galaxies: general - gamma-rays: bursts
Simbad objects: 6
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