Different progenitors of short hard gamma-ray bursts
Eleonora Troja, Andrew R. King, Paul T. O'Brien, Nicola Lyons, and, Giancarlo Cusumano
TL;DR
This paper investigates the spatial offsets of short hard gamma-ray bursts (SHBs) from their host galaxies, linking their properties to different progenitor systems such as neutron star-black hole and neutron star-neutron star mergers.
Contribution
It provides a detailed analysis of SHB offsets and proposes a connection between burst properties and specific binary merger progenitors.
Findings
SHBs with extended emission are close to their hosts.
Large offset SHBs lack extended emission and optical afterglows.
Different progenitors explain the observed offset and emission properties.
Abstract
We consider the spatial offsets of short hard gamma-ray bursts (SHBs) from their host galaxies. We show that all SHBs with extended duration soft emission components lie very close to their hosts. We suggest that NS-BH binary mergers offer a natural explanation for the properties of this extended duration/low offset group. SHBs with large offsets have no observed extended emission components and are less likely to have an optically detected afterglow, properties consistent with NS-NS binary mergers occurring in low density environments.
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