Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006aas...20916104s&link_type=abstract
2007 AAS/AAPT Joint Meeting, American Astronomical Society Meeting 209, #161.04; Bulletin of the American Astronomical Society,
Astronomy and Astrophysics
Astronomy
Scientific paper
Multiwavelength surveys combining deep groundbased optical imaging and Spitzer MIPS 24 micron mapping have revealed a population of extreme infrared-loud sources. The fraction of such sources increases significantly with decreasing 24 micron flux, indicating that they become a larger fraction of the 24 micron population with increasing redshift. Mid-infrared spectroscopy carried out with Spitzer's Infrared Spectrograph (IRS) has indicated that the brightest (f(24)>0.8 mJy) of these sources lie at z=2 and are powered predominantly by AGN. This mid-infrared spectroscopic classification is consistent with the lack of 1.6 micron stellar photospheric emission in their broadband SEDs. However, the fraction of sources with SEDs that do display this stellar bump increases to fainter 24 micron flux densities, indicating that the bulk of extreme sources may be powered by star formation. To test the SED-based classification of mid-infrared sources, and to study the properties of high-redshift starburst-dominated ULIRGs, we have obtained IRS spectra of 16 extreme IR-loud sources in the NDWFS Bootes field with f(24)=0.5-0.75 mJy and stellar photospheric emission suggesting z=2. The high fraction (14/16) of sources displaying PAH features contrasts with the power-law and absorption-dominated spectra common among extreme sources with brighter 24 micron fluxes. These results are an important verification of the assumptions used to classify sources based on photometry, which is available in far larger quantities than IRS spectroscopy.
Armus Lee
Brand Kate
Desai Vandana
Dey Arjun
Houck John
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