Transient Sources in Elliptical Galaxies

Details Transient Sources in Elliptical Galaxies Transient Sources in Elliptical Galaxies

Jan 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009aas...21343207b&link_type=abstract

American Astronomical Society, AAS Meeting #213, #432.07; Bulletin of the American Astronomical Society, Vol. 41, p.299

Astronomy and Astrophysics

Astronomy

Scientific paper

A key observational result that can constrain the nature of Low-Mass X-ray binaries (LMXBs) is their time variability. From theory it has been suggested that transient behavior is expected from luminous (LX>10^37 erg/s) LMXBs if these sources have evolved from native X-ray binaries in the stellar field, whereas GC-LMXBs are only expected to display transient behavior at lower luminosities.
From deep, multi-epoch Chandra observations of three nearby elliptical galaxies; NGC 3379, NGC 4278 and NGC 4697, we have identified a population of transient LMXBs in each of these galaxies. Here I will present the temporal and spectral properties of these sources and compare the populations between the three ellipticals. Also, although our sparse sampling does not allow us to constrain the duty cycles of these transient candidates, we can place limits on these values and also the fraction of transient sources detected in the field and in GCs.

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