The Nature of Ultraluminous X-ray Sources

Details The Nature of Ultraluminous X-ray Sources The Nature of Ultraluminous X-ray Sources

Jun 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005sptz.prop20551g&link_type=abstract

Spitzer Proposal ID #20551

Computer Science

Scientific paper

We propose IRS spectroscopy of nebular emission surrounding four nearby known ultraluminous X-ray sources (ULXs). The X-ray emission from these sources is produced by accretion onto stellar mass black holes with super-Eddington/beamed X-ray radiation, or intermediate mass black holes (> 100 M_sun) emitting isotropically. The nebular emission around the targeted ULXs consists of (1) known or suspected photoionized regions heated by disk emission from the central source, and (2) large (> 100 pc) shells driven by superwinds/multiple supernovae, or a single hypernova event. Our spectra will simultaneously sample the photoionized and shocked emission in these objects, and provide both valuable constraints on the ionizing spectrum of the accretion disk and the mass of the central black hole. In addition, intercomparison of our results will help clarify which mechanisms lead to ULX formation.

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