HI gas and stellar content of early-type galaxies

Details HI gas and stellar content of early-type galaxies HI gas and stellar content of early-type galaxies

Feb 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007newar..51....3s&link_type=abstract

New Astronomy Reviews, Volume 51, Issue 1-2, p. 3-7.

Astronomy and Astrophysics

Astronomy

6

Scientific paper

We present Australian telescope compact array observations of the neutral-hydrogen gas in 42 early-type galaxies detected by the HIPASS survey. We confirm the detection of 18 galaxies with HI mass between a few times 109 and ˜1010M&sun; and column density below a few times 1020 cm-2. Most of the confirmed detections show disk- or ring-like HI distribution with regular morphology and rotation. These HI-rich galaxies could have formed via either a HI-rich merger event or smooth accretion of gas from the intergalactic medium. As a part of a larger project, we present the results of optical spectroscopy and imaging and deeper 21 cm wavelength observations of one of the HI-rich galaxies, IC 4200, performed in order to distinguish between the two formation processes. We find that the galaxy hosts 8.5 × 109M&sun; of HI rotating on a ˜90° warped disk extended out to 60 kpc from the centre of the galaxy. Optical spectroscopy reveals a simple-stellar-population-equivalent age of 1.5 Gyr in the centre of the galaxy, and V- and R-band images show stellar shells. We interpret these observational results as evidence for a major merger origin of IC 4200, and date the merger back to 1 3 Gyr ago.

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