CARMA Observations of Submillimter Galaxies in COSMOS

Details CARMA Observations of Submillimter Galaxies in COSMOS CARMA Observations of Submillimter Galaxies in COSMOS

Jan 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009aas...21332304s&link_type=abstract

American Astronomical Society, AAS Meeting #213, #323.04; Bulletin of the American Astronomical Society, Vol. 41, p.378

Astronomy and Astrophysics

Astronomy

Scientific paper

We report on the first detections of 1mm continuum dust emission and 3mm molecular line emission using CARMA from a sample of mm/submm galaxies in the COSMOS field. Using the 1mm continuum emission to identify the optical counterpart, we have discovered a possible low redshift (z=0.76), unusually cold (Tdust=15 K) SMG. The late-type spiral galaxy that is the counterpart to the mm emission is detected at optical and near-infrared wavelengths but is increasingly fainter in the mid-infrared Spitzer bands, and is below the detection threshold at 8μm, 24μm, 70μm and 160μm. It is also undetected in the deep VLA 20cm data. Assuming a β=1.5, the best fit dust model yields a T=15.3±2 K and dust luminosity of 2.4×1011M&sun;. Although there is a possiblity that the submm emission is a very high redshift background object, all evidence suggests that the submm emission is associated with the low redshift source. This discovery lends support to the hypothesis that a significant fraction of the submm background may come from low redshift galaxies, instead of the typical z˜2--3 SMGs. We also report on observations of CO (J=2--1) emission towards a pair of submillimeter galaxies at z=1.505; the galaxies may be part of a high redshift cluster but are unlikely to be interacting. The detection of molecular gas in the redshift range from 1 2.

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