Sign on

SAO/NASA ADS Astronomy Abstract Service

· Find Similar Abstracts (with default settings below)
· Electronic Refereed Journal Article (HTML)
· Full Refereed Journal Article (PDF/Postscript)
· arXiv e-print (arXiv:astro-ph/0607089)
· On-line Data
· References in the article
· Citations to the Article (15) (Citation History)
· Refereed Citations to the Article
· SIMBAD Objects (11)
· NED Objects (8)
· Also-Read Articles (Reads History)
·
· Translate This Page
Title:
Observing Cold Gas in Submillimeter Galaxies: Detection of CO (1-->0) Emission in SMM J13120+4242 with the Green Bank Telescope
Authors:
Hainline, Laura J.; Blain, A. W.; Greve, T. R.; Chapman, S. C.; Smail, Ian; Ivison, R. J.
Affiliation:
AA(Department of Astronomy, California Institute of Technology, Mail Code 105-24, Pasadena, CA 91125; , , , .), AB(Department of Astronomy, California Institute of Technology, Mail Code 105-24, Pasadena, CA 91125; , , , .), AC(Department of Astronomy, California Institute of Technology, Mail Code 105-24, Pasadena, CA 91125; , , , .), AD(Department of Astronomy, California Institute of Technology, Mail Code 105-24, Pasadena, CA 91125; , , , .), AE(Institute for Computational Cosmology, Durham University, South Road, Durham DH1 3LE, UK; .), AF(Institute for Astronomy, University of Edinburgh, Blackford Hill, Edinburgh EH9 3HJ, UK; .; UK Astronomy Technology Centre, Royal Observatory, Blackford Hill, Edinburgh EH9 3HJ, UK.)
Publication:
The Astrophysical Journal, Volume 650, Issue 2, pp. 614-623. (ApJ Homepage)
Publication Date:
10/2006
Origin:
UCP
ApJ Keywords:
Galaxies: Evolution, Galaxies: Formation, Galaxies: High-Redshift, Galaxies: ISM, Infrared: Galaxies, Radio Lines: Galaxies
DOI:
10.1086/507443
Bibliographic Code:
2006ApJ...650..614H

Abstract

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-1. 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)×102 cm-3 and the presence of subthermally excited gas. The integrated line flux implies a cold molecular gas mass M(H2)=1.6×1011 Msolar, comparable to the dynamical mass estimate and 4 times larger than the H2 mass 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)<~4×1010 Msolar.
Bibtex entry for this abstract   Preferred format for this abstract (see Preferences)
   

Find Similar Abstracts:

Use: Authors
Title
Keywords (in text query field)
Abstract Text
Return: Query Results Return    items starting with number
Query Form
Database: Astronomy
Physics
arXiv e-prints