Other
Scientific paper
May 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007sptz.prop40714b&link_type=abstract
Spitzer Proposal ID #40714
Other
Scientific paper
Ultraluminous X-ray sources are non-nuclear sources in normal disk galaxies that are second only to AGNs in point-source luminosity. These enigmatic objects are either stellar mass black holes that are super-Eddington emitters, or sub-Eddington emission from 1E3-1E4 Msolar black holes. The key to this debate is whether the X-ray luminosity is indeed super-Eddington for a 10 Msolar black hole, or if it beamed and intrinsically much lower. X-ray spectral studies show that much of the soft X-ray emission is absorbed by gas and dust, which will be reemitted isotropically in the far-infrared. The ratio of the absorbed X-ray luminosity to the FIR luminosity is a direct measure of the anisotropy of the X-ray emission, and leads to a determination of the intrinsic luminosity of the ULX. A weak detection for one nearby ULX from existing data suggests that the X-ray emission is beamed and here we propose a much more sensitive IRAC and MIPS study of this ULX in Holmberg IX as well as another nearby high luminosity ULX in NGC 1313. These data will determine whether ULXs are sub-Eddington or super-Eddington emitters.
Bregman Joel
Irwin Jimmy
Miller Jon
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