Spitzer Observations of the X-ray Sources of NGC 4485/90

Details Spitzer Observations of the X-ray Sources of NGC 4485/90 Spitzer Observations of the X-ray Sources of NGC 4485/90

Jun 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006aas...208.1402v&link_type=abstract

American Astronomical Society Meeting 208, #14.02; Bulletin of the American Astronomical Society, Vol. 38, p.93

Astronomy and Astrophysics

Astronomy

Scientific paper

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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