Other
Scientific paper
Sep 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004sptz.prop.3453v&link_type=abstract
Spitzer Proposal ID #3453
Other
Scientific paper
We propose to obtain IRS (Long-Low) spectra of 2 strongly lensed faint submillimeter galaxies at z=2.5 and 2.8. These galaxies are gravitationally lensed by foreground clusters, with amplification factors >10. Intrinsically however, their 850 micron fluxes are about 0.8 mJy. The sub-mJy submm population is important since the integrated background is believed to be dominated by such galaxies, as inferred from the steepness of the submm counts at brighter flux levels. Lyman break galaxies on the other hand are believed to have somewhat lower fluxes, at the level 0.1-0.4 mJy. Since all of these flux levels are below the blank-field confusion limit, they can only be probed using gravitational lenses. Our sources are thus unique objects, providing the only present opportunity to study the faint submm population at flux levels where the transition towards the relatively unobscured Lyman break galaxies occurs. Here we propose IRS spectroscopy of both of these objects, aimed at characterizing the dusty star forming interstellar medium (ISM) of these faint submm sources. Our spectra will probe the rest-frame 5.5-11 micron region, where aromatic features are diagnostic of star formation, and silicate absorption provides a measure of absorbing material. We will compare the results to local (ultra)luminous infrared galaxies and to similar observations of intrinsically much more luminous sources included in GTO Spitzer programs. The silicate absorption will be especially relevant for the faint submm sources studied here, which may be less obscured than their more luminous cousins, and where the underlying starburst may begin to shine through.
Blain Andrew
Borys Colin
Kneib Jean Paul
Kraiberg Knudsen Kirsten
van der Werf Paul P.
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