Redshift Determination and 12CO Line Excitation Modeling for the Multiply-Lensed Submillimeter Galaxy SMM 1057+5730

Details Redshift Determination and 12CO Line Excitation Modeling for the Multiply-Lensed Submillimeter Galaxy SMM 1057+5730 Redshift Determination and 12CO Line Excitation Modeling for the Multiply-Lensed Submillimeter Galaxy SMM 1057+5730

Jan 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011aas...21724513s&link_type=abstract

American Astronomical Society, AAS Meeting #217, #245.13; Bulletin of the American Astronomical Society, Vol. 43, 2011

Astronomy and Astrophysics

Astronomy

Scientific paper

We report a redshift of z=2.956 for SMM 1057+5730, a multiply-lensed sub-millimeter galaxy detected with Herschel/SPIRE in the HerMES Lockman-SWIRE field. With the 100 GHz instantaneous bandwidth of the Z-Spec instrument on the Caltech Submillimeter Observatory, we robustly identify the redshift of this source from the simultaneous detection of four 12CO emission lines (J = 7-6, J = 8-7, J = 9-8, and J = 10-9). Combining the measured line fluxes for these high-J transitions with the J = 3-2 and J = 5-4 line fluxes measured with CARMA and the IRAM PdBI, respectively, we model the physical properties of the molecular gas in this galaxy. We find that the full 12CO spectral line energy distribution is best described by warm, low-density gas (T 400 K, n 102.7 cm-3). However, it is possible that the highest J transitions are radiatively excited by warm gas (potentially close to an AGN), or alternatively are tracing a small fraction of very dense gas in molecular cloud cores, which in either case a single gas component model would not describe the full SLED. Future observations of lower J transitions for this source will aid in distinguishing between these scenarios.

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