Search for CO emission from the damped Lyman-alpha system toward QSO 1215+333

Details Search for CO emission from the damped Lyman-alpha system toward QSO 1215+333 Search for CO emission from the damped Lyman-alpha system toward QSO 1215+333

Aug 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994pasj...46l.163o&link_type=abstract

PASJ: Publications of the Astronomical Society of Japan (ISSN 0004-6264), vol. 46, no. 4, p. L163-L166

Astronomy and Astrophysics

Astronomy

1

Carbon Monoxide, Damping, Galactic Evolution, H Beta Line, Hydrogen, Lyman Alpha Radiation, Quasars, Radio Astronomy, Red Shift, Infrared Astronomy, Infrared Spectra, Radio Telescopes, Spectrometers, Star Formation

Scientific paper

A search for redshifted(12) CO (J = 1 goes to 0) emission from the damped Lyman-alpha system at z = 2.00 toward QSO 1215+333 was made. No emission was found, and the upper limit of the molecular-hydrogen mass is 1.6 x 1011/sq h solar masses (q0 = 0.5) if we assume a velocity width of 400 km/s and the Galactic CO-to-H2 conversion factor. We estimated the far-infrared luminosity from the H(beta) luminosity, and found that the upper limit of the molecular-hydrogen mass and far-infrared luminosity are comparable to those of ultraluminous far-infrared galaxies. However, the upper limit of the molecular-hydrogen mass obtained in this system is much smaller than the molecular-hydrogen mass found in other damped Lyman-alpha systems at z = 2-3. It seems that the star-formation properties in these damped Lyman-alpha systems are quite different from those of the system toward QSO 1215+333 and nearby galaxies. Further observations of more damped Lyman-alpha systems in CO lines as well as in other wavelengths are indispensable to trace the star-formation history of damped Lyman-alpha systems.

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