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Molecular line probes of activity in galaxies

Published online by Cambridge University Press:  04 October 2008

C. Kramer ,
S. Aalto ,
R. Simon ,
S. García-Burillo ,
J. Graciá-Carpio ,
A. Usero ,
P. Planesas ,
A. Fuente  and
M. Krips
S. García-Burillo*
Affiliation:
Observatorio de Madrid, OAN, Alfonso XII, 3, 28014-Madrid, Spain
J. Graciá-Carpio
Affiliation:
Observatorio de Madrid, OAN, Alfonso XII, 3, 28014-Madrid, Spain
A. Usero
Affiliation:
Observatorio de Madrid, OAN, Alfonso XII, 3, 28014-Madrid, Spain
P. Planesas
Affiliation:
Observatorio de Madrid, OAN, Alfonso XII, 3, 28014-Madrid, Spain
A. Fuente
Affiliation:
Observatorio de Madrid, OAN, Alfonso XII, 3, 28014-Madrid, Spain
M. Krips
Affiliation:
CfA, SMA project, 60 Garden Street, MS 78 Cambridge, MA 02138, USA
*
[email protected]
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Abstract

The use of specific tracers of the dense molecular gas phase can help to explore the feedback of activityon the interstellar medium (ISM) in galaxies. This information is a key to any quantitative assessmentof the efficiency of the star formation process in galaxies. We present the results of a survey devotedto probe the feedback of activity through the study of the excitation and chemistry of the dense moleculargas in a sample of local universe starbursts and active galactic nuclei (AGNs). Our sample includes also17 luminous and ultraluminous infrared galaxies (LIRGs and ULIRGs). From the analysis of the LIRGs/ULIRGssubsample, published in Graciá-Carpio et al.  (2007), we find the first clear observational evidencethat the star formation efficiency of the dense gas, measured by the LFIR/LHCN ratio, issignificantly higher in LIRGs and ULIRGs than in normal galaxies. Mounting evidence of overabundantHCN in active environments would even reinforce the reported trend, pointing to a significant turnupward in the Kennicutt-Schmidt law around LFIR = 1011L๏. This result has majorimplications for the use of HCN as a tracer of the dense gas in local and high-redshift luminousinfrared galaxies.

Type
Research Article
Information
European Astronomical Society Publications Series , Volume 31: Far-Infrared Workshop 2007 , 2008 , pp. 85 - 88
Copyright
© EAS, EDP Sciences, 2008

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References

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