X-rays from Blue Compact Dwarf Galaxies

Details X-rays from Blue Compact Dwarf Galaxies X-rays from Blue Compact Dwarf Galaxies

Jan 2012

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2012aas...21915315s&link_type=abstract

American Astronomical Society, AAS Meeting #219, #153.15

Astronomy and Astrophysics

Astronomy

Scientific paper

The origin of ionizing photons in the reionization epoch is an important and open question. It has been proposed that X-ray binaries had a significant impact on the intergalactic medium in this epoch. We studied X-ray binaries in all blue compact dwarf galaxies (BCD's), often considered to be local analogs to early galaxies, within 15Mpc with metallicities <0.07Z solar. We found that the total X-ray luminosity of the sample is ten times greater than one would expect scaling from the relation with star formation rate for normal metallicity galaxies. However, due to the low number of detected sources, one can only exclude the hypothesis that the relation for BCD's is the same at the 96.6% confidence interval. This suggests that X-ray binary production may have had an enhanced impact in the early thermal history of the universe.

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