X-ray Binary Populations in Normal elliptical Galaxies

Details X-ray Binary Populations in Normal elliptical Galaxies X-ray Binary Populations in Normal elliptical Galaxies

Dec 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006aas...20915503b&link_type=abstract

2007 AAS/AAPT Joint Meeting, American Astronomical Society Meeting 209, #155.03; Bulletin of the American Astronomical Society,

Astronomy and Astrophysics

Astronomy

Scientific paper

We present the preliminary results of deep Chandra monitoring of the LMXB populations of two elliptical galaxies, NGC 3379 and NGC 4278. It is important to study these LMXBs as they provide the only direct fossil evidence of the formation and evolution of binary stars in elliptical galaxies. With 110 and 140 ks Chandra ACIS S3 exposures, we detect 59 and 112 LMXBs within the D25 ellipse of NGC 3379 and NGC 4278, respectively. The spectral and temporal characteristics of these point sources have been investigated with an image analysis pipeline, which we will summarise here. We also present deep images of both galaxies, alongside X-ray color-color diagrams and variability plots, allowing us to constrain the fraction of transients in these galaxies, thus placing important limits on formation mechanisms and binary evolution. Further to this, we will also compare these LMXBs to counterparts, found in both the field and globular clusters.

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