Statistics
Scientific paper
Sep 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004sptz.prop.3360c&link_type=abstract
Spitzer Proposal ID #3360
Statistics
Scientific paper
We propose IRAC imaging of the starburst galaxy system NGC 4485/90, and pointed IRS spectral mapping for eight locations within the galaxies. NGC 4485/90 houses an extraordinarily large number of Ultra-luminous X-ray sources (ULXs), and has a dense array of HII star-forming (SF) regions. We will use IRAC images to study correlation statistics between the the six ULXs and nearby IR-luminous SF regions. The IRS spectral mapping data is to be taken for rectangular regions centered on the six ULXs, and for two comparison regions in NGC 4490. These spectra will be used to measure physical characteristics (e.g. density, excitation) of the gas in the SF regions and to diagnose properties (e.g. luminosity, hardness) of the components of the ionizing radiation. Our proposed Spitzer observations will help distinguish between competing models for ULXs, and will greatly complement on-going X-ray spectral diagnostic work, which is currently only possible for very X-ray bright ULXs.
Colbert Edward
Hornschemeier Ann
Malhotra Sangeeta
Roberts Timothy
Ward Martin
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