CO lines from giant arcs in clusters.

Details CO lines from giant arcs in clusters. CO lines from giant arcs in clusters.

Publishing date

Feb 1996

URL

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996a%26a...306l..41c&link_type=abstract

Journals

Astronomy and Astrophysics, v.306, p.L41

Science

Astronomy and Astrophysics

Field

Astrophysics

Additional info 2

8

Additional info 3

Cosmology: Gravitational Lensing, Galaxies: Evolution, Galaxies: Formation, Interstellar Medium: Molecules

Type

Scientific paper

Abstract

We present observations of the CO emission from 4 giant arcs in clusters of galaxies, made with the IRAM 30m telescope. These arcs are the images of distant galaxies magnified by the gravitational lensing effect of the foreground cluster. The redshifts of the observed objects range from 0.7 to 2.2. We have detected the CO(2-1) line associated with the bright arc in the cluster Abell 370, at a redshift of 0.725. With reasonable assumptions the molecular mass in this object can be estimated to be 1.4x10^9^Msun_, similar to that found in our own galaxy. For the three other arcs we get upper limits which range between 4x10^9^Msun_ and 7x10^9^Msun_. Among the few objects at cosmological distances which have confirmed detections of CO lines in emission, gravitational lensing is at play in at least two: the Cloverleaf and IRAS10214+4724. In both sources the amplification factor is still very uncertain. Our detection of CO emission in A370 shows that with the the help of "gravitational telescopes" one can study the gaseous content of normal galaxies at look back times of one third of the age of the Universe.

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