Other
Scientific paper
Mar 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008sptz.prop50030s&link_type=abstract
Spitzer Proposal ID #50030
Other
Scientific paper
Ten 24-micron-only sources have been discovered in a search through the entire 45-square-degree SWIRE survey. These are bright 24 micron sources (F(24) > 0.5 mJy) undetected in any other bands. They represent a rare (1 per 5-15 sq deg) population of the reddest mid-infrared sources known so far. On the basis of lack of proper motion, we rule out the hypothesis that they are asteroids. The very high ratios of 24 micron to IRAC fluxes implied by non-detection of IRAC means that these are very unusual, extremely obscured objects. The non-detections at every other wavelengths to our depths, including the optical and MIPS 70 micron and 160 micron bands, make it even more difficult to explain them with any known populations (e.g. Compton-thick AGNs or obscured starbursts). With detection at only a single wavelength, the only room for exploration accessible is in the mid-infrared, where these sources are detected. We propose, in this last cryogenic cycle, to obtain IRS spectra in order to measure the redshifts and to unveil the nature of these mysterious sources through SED fitting. The LL1 and LL2 modules of the IRS are requested, covering rest frame wavelengths of 4.7-12.7 microns at z=2, 3.5-9.5 microns at z=3, and 2.8-7.6 microns at z=4. If these sources are indeed high-z obscured AGNs or starbursts (but with much higher attenuation than those previously detected), the PAH features or broken power-laws will show up in the IRS spectra. These will further extend our knowledge on these extreme populations. It will be even more exciting if the 24-micron-only sources are found to form an entirely new population!
Farrah Duncan
Frayer David
Lonsdale Carol
Oliver Seb
Polletta Mari
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