CO (3-2) and CO (2-1) Detections in a z =1.3 Hyper-Luminous Starburst Galaxy

Details CO (3-2) and CO (2-1) Detections in a z =1.3 Hyper-Luminous Starburst Galaxy CO (3-2) and CO (2-1) Detections in a z =1.3 Hyper-Luminous Starburst Galaxy

Dec 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006pasj...58..957i&link_type=abstract

Publications of the Astronomical Society of Japan, Vol.58, No.6, pp.957-963

Astronomy and Astrophysics

Astronomy

12

Cosmology: Observations, Galaxies: Formation, Galaxies: High Redshift, Galaxies: Individual (Mips J142824.0+352619), Galaxies: Starburst

Scientific paper

We present an ˜2'' resolution image of the CO (2-1) emission and an ˜4'' resolution image of the CO (3-2) emission in the z=1.3 hyper-luminous starburst galaxy MIPS J142824.0+352619, obtained at the Nobeyama Radio Observatory. Our new CO (3-2) and CO (2-1) emission detections yield L'CO(3-2) = 1.4(±0.5) × 1011 and L'CO(2-1) = 1.2(± 0.3) × 1011 K km s-1 pc2, which translate to a molecular gas mass of ˜1011Modot, assuming a CO to H2 conversion factor appropriate for ULIRGs. The derived high CO luminosities place this source as being one of the brightest galaxies detected in CO to date. The CO (3-2) and CO (2-1) derived redshifts are 1.3248±0.0002 and 1.3250±0.0002. If the bulk of the molecular gas traced in these lines is completely thermalized, as suggested by L'CO(3-2)/L'CO(2-1) ˜ 1, a constraint to the gas density of n gtrsim 103 cm-3 is obtained from our Large Velocity Gradient (LVG) analysis. If a significant fraction of the bright FIR luminosity of LFIR = (3.2 ± 0.7) × 1013 Lodot arises from starburst activity, then the Star Formation Efficiency (SFE) is 320 LodotModot-1. The size constraint of 1".3 given by the CO (2-1) map provides an upper limit to the lensing magnification factor of μ lesssim 8, which further supports the earlier claim that the magnification of this source is only modest.

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