Chandra Monitoring Observations of The Antennae Galaxies. I. Catalog of Source Properties

Details Chandra Monitoring Observations of The Antennae Galaxies. I. Catalog of Source Properties Chandra Monitoring Observations of The Antennae Galaxies. I. Catalog of Source Properties

Sep 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006apjs..166..211z&link_type=abstract

The Astrophysical Journal Supplement Series, Volume 166, Issue 1, pp. 211-248.

Astronomy and Astrophysics

Astronomy

21

Galaxies: Individual (Ngc 4038/39), Galaxies: Interactions, Galaxies: Peculiar, X-Rays: Binaries, X-Rays: Galaxies

Scientific paper

We present the properties of the discrete X-ray sources detected in our monitoring survey of the Antennae galaxies with Chandra ACIS-S. We detect ~70 sources down to a typical luminosity of 7×1037 ergs s-1 in each of the six monitoring observations. In the co-added observation (which has a total exposure of 411 ks) we detect a total of 120 sources down to a luminosity of (2-5)×1037 ergs s-1, depending on the local background. Fifteen sources have a strong extended component. Fourteen of the pointlike sources have luminosities above 1039 ergs s-1, at least in one exposure, which qualifies them as ultraluminous X-ray sources (ULXs). Ten of the ULXs show long-term variability, while one is observed only once, suggesting that it is a transient source. We find that 25 sources exhibit long-term variability clearly associating them with accreting compact objects. Twenty-one sources also show spectral variability. However, their variability patterns are diverse, indicating that they belong to different source classes. Finally, we find a weak excess of hard sources at the low luminosities that we tentatively associate with pulsar X-ray binaries.

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