On the Nature of X-ray Sources in Early-Type Galaxies

Details On the Nature of X-ray Sources in Early-Type Galaxies On the Nature of X-ray Sources in Early-Type Galaxies

2005-01-21

arxiv.org/abs/astro-ph/0501476v2

Astrophys.J. 621 (2005) L25-L28

Astronomy and Astrophysics

Astrophysics

5 pages, 1 figure, minor typographical corrections

Scientific paper

10.1086/428905

We show that the observed relationship between the fraction of low-mass X-ray binaries (LMXBs) found in globular clusters (GCs) and the GC-specific frequency for early-type galaxies is consistent with an LMXB formation model in which the field population of LMXBs is formed in situ via primordial binary formation. The suggestion that a significant fraction of the field LMXB population in early-type galaxies was formed in GCs is not required by the data. Finally, we discuss observational studies that will test this model more thoroughly.

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