SIMBAD references

2006ApJ...650..614H - Astrophys. J., 650, 614-623 (2006/October-3)

Observing cold gas in submillimeter galaxies: detection of CO (1⟶0) emission in SMM J13120+4242 with the Green Bank telescope.

HAINLINE L.J., BLAIN A.W., GREVE T.R., CHAPMAN S.C., SMAIL I. and IVISON R.J.

Abstract (from CDS):

We report the first detection of CO (1⟶0) emission from a submillimeter-selected galaxy, using the Green Bank Telescope. We identify the line in the spectrum of SMM J13120+4242 as a broad emission feature at z=3.408, with ΔVFWHM=1040±190 km/s. If the observed CO (1⟶0) line profile arises from a single object and not several merging objects, then the CO (4⟶3)/CO (1⟶0) brightness temperature ratio of ∼0.26 suggests n(H2)>(3-10)x102/cm3 and the presence of subthermally excited gas. The integrated line flux implies a cold molecular gas mass M(H2)=1.6x1011 M, comparable to the dynamical mass estimate and 4 times larger than the H2mass predicted from the CO (4⟶3) line, assuming a brightness temperature ratio of 1.0. While our observations confirm that this submillimeter galaxy is massive and gas-rich, they also suggest that extrapolating gas masses from Jupper≥3 transitions of CO leads to considerable uncertainties. We also report an upper limit to the mass of cold molecular gas in a second submillimeter galaxy, SMM J09431+4700, of M(H2)≲4x1010 M.

Abstract Copyright:

Journal keyword(s): Galaxies: Evolution - Galaxies: Formation - Galaxies: High-Redshift - Galaxies: ISM - Infrared: Galaxies - Radio Lines: Galaxies

Status at CDS:  

Simbad objects: 11

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2020.04.06-05:01:13

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