A HCN and HCO+ Multi-transition Line Survey in Active Galaxies: AGN versus Starburst Environments

Details A HCN and HCO+ Multi-transition Line Survey in Active Galaxies: AGN versus Starburst Environments A HCN and HCO+ Multi-transition Line Survey in Active Galaxies: AGN versus Starburst Environments

Dec 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006aas...20911104k&link_type=abstract

2007 AAS/AAPT Joint Meeting, American Astronomical Society Meeting 209, #111.04; Bulletin of the American Astronomical Society,

Astronomy and Astrophysics

Astronomy

1

Scientific paper

Based on recent multi-line studies (mainly HCN, HCO+ and CO) in active galaxies, the molecular gas properties close to an AGN seem to differ significantly from those close to a starburst (SB). The origin of the differences is mostly unknown and could be everything from systematically different densities, -temperatures, -abundances to additional non-collisional excitation of the gas. We thus carried out multi-transition observations with the IRAM 30m of HCN and HCO+ in 12 nearby active galaxies, containing either an AGN and/or SB, to analyse their gas density, temperature and abundance as a function of their activity type. To reduce biases due to source filling factors and the difficulty to separate AGN from SB environments within the IRAM 30m beam for some sources, we started follow-up interferometric observations of HCN and HCO+ at the SMA and IRAM PdBI in a few selected sources at high angular resolution and sensitivity. We will discuss first results of these observations which suggest non-standard molecular abundances around AGN as main cause for the differences seen in the molecular gas properties compared to SB environments.

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