Other
Scientific paper
Jan 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011aas...21724512f&link_type=abstract
American Astronomical Society, AAS Meeting #217, #245.12; Bulletin of the American Astronomical Society, Vol. 43, 2011
Other
Scientific paper
Presented are Spitzer/IRS spectra of two lensed UV-bright z 2 star-forming galaxies, SDSS J120602.09+514229.5 and SDSS J090122.37+181432.3. With the magnification provided by lensing, we study the rest-frame 5 - 12 micron emission of the galaxies in greater detail than otherwise possible. We infer both targets are undergoing intense star-formation through the strong PAH emission seen at 6.2, 7.7, and 11.3 microns. In J1206, we detect rising continuum and significant [SIV] emission, indicating a moderately hard radiation field is powering the mid-IR luminosity. We use the strength of the [SIV] emission to infer a metallicity of Z ˜ 0.5*Zsun in J1206, confirming existing measurements at optical wavelengths. For J0901, we find the strength of the PAH emission, shallow slope of the continuum, and the strength of optical [OIII] emission imply AGN energetics provide only a small fraction of the infrared luminosity. Through the ratio of [Ar III]/[Ar II], we also imply a metallicity of Z > 1.3 Zsun for J0901. We highlight the importance of both optical and mid-IR spectroscopy in understanding the properties of high-redshift galaxies. This work is based on observations made with the Spitzer Space Telescope, which is operated by the Jet Propulsion Laboratory, California Institute of Technology under a contract with NASA. Support for this work was provided by NASA through two awards issued by JPL/Caltech.
Allam Sahar S.
Allyn Smith J.
Baker Andrew Jordan
Fadely Ross
Lin Hainan
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