Molecular excitation at the nucleus of the QSO I Zw 1

Details Molecular excitation at the nucleus of the QSO I Zw 1 Molecular excitation at the nucleus of the QSO I Zw 1

Jan 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001iaus..205..344e&link_type=abstract

Galaxies and their Constituents at the Highest Angular Resolutions, Proceedings of IAU Symposium #205, held 15-18 August 2000 at

Computer Science

Scientific paper

With a redshift of z = 0.0611 I Zw 1 is one of the closest QSOs for which detailed interferometric studies of the host galaxy ISM are possible. I Zw 1 is interacting with a nearby companion east of the nuclear bulge at the edge of its optical disk and shows a number of properties also found in high redshift QSOs. The most recent observations of the 12CO(2-1) line emission of I Zw 1 using the PdBI in its B/C configuration have reached subarcsecond angular resolution (0.9'' FWHM; Schinnerer et al. in prep.). Our recent 12CO(1-0) data showed a 1.5'' (1.5 kpc) diameter ring-like distribution of the molecular gas and high resolution NIR observations indicate the presence of a circum-nuclear starburst (Schinnerer et al. 1998, ApJ 500, 147). Compared to J=1-0 our new J=2-1 emission line data is more centrally peaked. This is consistent with our previous finding (Eckart et al. 1994, ApJ 424, 627) that the molecular gas in the disk of I Zw 1 is cold or sub-thermally excited (low line ratio I[12CO(2-1)]/I[12CO(1-0)]~0.5), whereas the emission from the nucleus is due to warm optically thick molecular gas (larger line ratio I[12CO(2-1)]/I[12CO(1-0)]~1.0) heated by the nuclear star formation activity. The increase of the 12CO(2-1) line intensity due to molecular excitation compensates the contrast that is required to get a sharper view of the ring-like structure seen in the 12CO(1-0) line emission which is evident in subarcsecond interferometric 12CO(1-0) data taken with BIMA (Staguhn, Schinnerer, Eckart in prep.).

Affiliated with

Also associated with

No associations

Rating

Molecular excitation at the nucleus of the QSO I Zw 1 does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Molecular excitation at the nucleus of the QSO I Zw 1, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Molecular excitation at the nucleus of the QSO I Zw 1 will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1363215