Structure and kinematics of large spiral galaxies

Details Structure and kinematics of large spiral galaxies Structure and kinematics of large spiral galaxies

Feb 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007newar..51..120s&link_type=abstract

New Astronomy Reviews, Volume 51, Issue 1-2, p. 120-124.

Astronomy and Astrophysics

Astronomy

1

Scientific paper

We parametrise the structure and kinematics of four large and massive spiral galaxies in terms of a tilted-ring model of the HI disk. Only one of the examined galaxies shows a typical warp structure, suggesting that warps are rarer towards larger masses of spiral galaxies. The galaxies show a sharp drop in the HI surface density profile at a large radius, which determines the edge of the HI disk. Beyond this edge we do not detect any neutral gas. Including the results of earlier, similar studies, we find a possible anti-correlation of the size of HI disks of spiral galaxies (in terms of optical radii) with the optical radius of a galaxy. An extremely massive HI cloud without any stellar counterpart in the DSS2 is found to interact with UGC 2153.

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