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Title:
Spitzer Observations of the X-ray Sources of NGC 4485/90
Authors:
Vazquez, Gerardo A.; Colbert, E.; Hornschemeier, A.; Malhotra, S.; Roberts, T.; Ward, M.
Affiliation:
AA(Johns Hopkins University), AB(Johns Hopkins University), AC(NASA/GSFC), AD(Arizona State U), AE(U. Leicester, United Kingdom), AF(U. Durham, United Kingdom)
Publication:
American Astronomical Society Meeting 208, #14.02; Bulletin of the American Astronomical Society, Vol. 38, p.93
Publication Date:
06/2006
Origin:
AAS
Bibliographic Code:
2006AAS...208.1402V

Abstract

The mechanism for forming (or igniting) so-called Ultra-Luminous X- ray sources (ULXs) is very poorly understood. In order to investigate the stellar and gaseous environment of ULXs, we have observed the nearby starburst galaxy system NGC 4485/90 with Spitzer's IRAC and IRS instruments. High-quality mid-infrared images and spectra are used to characterize the stellar history of stars near the ULXs, and the ionization state of the surrounding gas. NGC 4485/90 fortuitively hosts six ULXs, and we have analyzed IRAC images and IRS spectra of all six regions. We also observed two "comparison" regions with no X-ray sources. Here we present our preliminary findings on the similarities and differences between the stellar and gaseous components near the ULXs.
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