Kinematics of an Anaemic Cluster Galaxy

Details Kinematics of an Anaemic Cluster Galaxy Kinematics of an Anaemic Cluster Galaxy

Mar 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001ap%26ss.276..459v&link_type=abstract

Astrophysics and Space Science, v. 276, Issue 2/4, p. 459-465 (2001).

Astronomy and Astrophysics

Astrophysics

3

Scientific paper

We present new HI and CO data including velocity information of NGC 4548, an anaemic galaxy in the Virgo Cluster. The distribution of the atomic gas shows a ring-like structure. The HI rotation curve is deduced and can be extrapolated inwards with the help of the CO data. The derived molecular fraction decreases continuously up to a radius of about 40'' showing a rather sharp transition between the molecular and the atomic disc. A three-dimensional visualization of the data cube permits us to detect a perturbation of the velocity field in the northern part of the galaxy. In a first approach we reconstruct the possible sites of HI emission with the help of a simple kinematical model in three dimensions. The reconstructed model shows a ridge which is believed to be due to ram-pressure stripping. In addition, we show first results of a dynamical model to simulate the interaction between the intra-cluster medium and the galaxy.

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