Spitzer Imaging of Herschel-ATLAS Gravitationally Lensed Submillimeter Sources

Details Spitzer Imaging of Herschel-ATLAS Gravitationally Lensed Submillimeter Sources Spitzer Imaging of Herschel-ATLAS Gravitationally Lensed Submillimeter Sources

Jan 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011aas...21725513k&link_type=abstract

American Astronomical Society, AAS Meeting #217, #255.13; Bulletin of the American Astronomical Society, Vol. 43, 2011

Astronomy and Astrophysics

Astrophysics

Scientific paper

In this study, we present two submillimeter selected gravitiational lensed sources and their 3.6 and 4.5 μm properties that were identified in the Herschel Astrophysical Tetrahertz Large Area Survey (H-ATLAS). Due to their flux densities being > 100 mJy at 500 μm makes these submillimeter galaxies (SMGs) not observable when using traditional optical selection methods for lensing events. We determined several important constrains on the SMG spectral energy distributions (SEDs) of these two sources by fitting light profiles to each foreground gravitational lens in the Spitzer IRAC data and successfully disentangling the foreground lens and background source components. Our results from the SED fitting shows that these two SMGs are highly obscured by dust with Av ˜ 4 to 5, stellar masses of 3 x 1011, and star formation rates of 100 and 150 M&sun; yr-1. By combining H2 molecular masses from previously reported CO(1-0) line intensities, we determined that the gas fraction relative to stellar masses is at the level of 5% to 8% for the two galaxies.

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