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Title:
CO emission from the Z = 3.137 damped Ly-alpha system toward PC 1643+4631A
Authors:
Frayer, David T.; Brown, Robert L.; Vanden Bout, P. A.
Affiliation:
AA(National Radio Astronomy Observatory, Charlottesville, VA, US), AB(National Radio Astronomy Observatory, Charlottesville, VA, US), AC(National Radio Astronomy Observatory, Charlottesville, VA, US)
Publication:
Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X), vol. 433, no. 1, p. L5-L8 (ApJL Homepage)
Publication Date:
09/1994
Category:
Astronomy
Origin:
STI
NASA/STI Keywords:
Absorption Spectra, Carbon Monoxide, Emission Spectra, Galactic Evolution, Lyman Alpha Radiation, Quasars, Radio Astronomy, Red Shift, Astronomical Models, Astronomical Spectroscopy, Interstellar Gas, Lyman Spectra, Mathematical Models, Molecular Excitation, Radio Telescopes, Stellar Luminosity
DOI:
10.1086/187534
Bibliographic Code:
1994ApJ...433L...5F

Abstract

We report the detection of CO (1-0) and CO(3-2) emission observed toward the quasar PC 1643+4631A at a redshift corresponding to the z = 3.137 damped Ly-alpha system previously identified in the optical spectrum of the object. This is the highest redshift CO detection reported to date. The CO emission lines have a velocity width greater than or approximately equal to 700 km/s full width at zero intensity (FWZI). The CO line luminosities are approximately 108 solar luminosity, and the mass of molecular gas is approximately 1012 solar mass. Radiative transfer calculations using a large velocity gradient model imply a gas kinetic temperature of approximately 30 K. The models and observations together indicate that the angular size of the higher excitation CO(3-2) emission region is approximately 0.3-0.5 times that of the lower excitation CO(1-0) emission region; that is, the gas is appreciably clumped.

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