Sub-arcsecond multi-transition molecular line observations of the nearby QSO I ZW 1

Details Sub-arcsecond multi-transition molecular line observations of the nearby QSO I ZW 1 Sub-arcsecond multi-transition molecular line observations of the nearby QSO I ZW 1

Jan 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005esasp.577..331s&link_type=abstract

In: Proceedings of the dusty and molecular universe: a prelude to Herschel and ALMA, 27-29 October 2004, Paris, France. Ed. by A

Computer Science

Galaxies: Ism, Nuclei, Quasars: Individual (I Zw 1)

Scientific paper

We present the first sub-kpc (~0.7"≍850 pc) resolution 12CO(1-0) molecular line observations of the ISM in the host galaxy of the QSO I Zw 1. The observations were obtained with the BIMA mm-interferometer in its compact A configuration. The BIMA data are complemented by new observations of the 12CO(2-1) and 13CO(1-0) line with IRAM Plateau de Bure mm-interferometer (PdBI) at 0.9" and 2.1" resolution, respectively. Out images of the 12CO(1-0) line emisson show a ring-like structure in the circumnuclear molecular gas distribution with an inner radius of about 1.2 kpc. A comparison of the BIMA data with IRAM PdBI 12CO(2-1) observations shows variations in the excitation conditions of the molecular gas in the innermost 1.5" comprising the nuclear region of I Zw 1. The observed properties of the molecular cloud complexes in the disk of the host galaxy suggest that they can be the sites of massive circumnuclear star formation, and show no indications of excitation by the nuclear AGN. This all indicates that the molecular gas in a QSO host galaxy has similar properties to the gas observed in nearby low luminosity AGNs.

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