Astronomy and Astrophysics – Astronomy
Scientific paper
Feb 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010head...11.0107b&link_type=abstract
American Astronomical Society, HEAD meeting #11, #1.07; Bulletin of the American Astronomical Society, Vol. 41, p.653
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>1037 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 spectral properties of these sources and discuss how spectral simulations can be utilized, even with low S/N data, to determine the spectral states of these transients.
Further, I will discuss how these observational results can be used in combination with population synthesis modeling to predict future transient behavior within these galaxies and will discuss the best strategy on identifying transient sources with future observing programs.
Angelini Leonardo
Blake Sarah
Brassington Nicola
Davies Richard
Fabbiano Giuseppina
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