Molecular Gas Properties Of Early-type Galaxies

Details Molecular Gas Properties Of Early-type Galaxies Molecular Gas Properties Of Early-type Galaxies

Jan 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010aas...21545809c&link_type=abstract

American Astronomical Society, AAS Meeting #215, #458.09; Bulletin of the American Astronomical Society, Vol. 42, p.484

Astronomy and Astrophysics

Astronomy

Scientific paper

A recent volume-limited survey of early-type galaxies (the Atlas3d sample) has detected 12CO emission from molecular gas in approximately 25%. To study the properties of the molecular gas in early-type galaxies we have recently followed up the brightest of these 12CO detections in 13CO, HCN and HCO+ using the IRAM 30m telescope. All of these molecules trace denser gas than 12CO, although opacity and abundance effects can also have major roles (especially if AGN are present). The observations detect 15/15 observed in 13CO(1-0), 10/12 in HCN(1-0) and 5/12 in HCO+(1-0). Comparing the line ratios (based on integrated intensities in a central pointing) of these lines with those found for spiral galaxies reveals that most early-type galaxies with molecular gas have similar dense gas fractions, opacities and abundances to spirals. However, three galaxies are outliers in both the 13CO/12CO and HCN/12CO ratios indicating a higher fraction of dense gas than normally found in spiral disks. Additionally, the ratio of HCN/HCO+ is higher than that found for spiral disks in several early-type galaxies, possibly reflecting the effect of an AGN depleting the HCO+.

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