Abstract Details
| Name: Peter Kamphuis Affiliation: NCRA-TIFR Conference ID: ASI2016_772 Title : Neutral Hydrogen in the Halo of the Early Type Galaxy ESO 92-G021 Authors and Co-Authors : T. Day B. S. Koribalski P.Serra G.Heald S. Haan affiliation is CSIRO Astronomy & Space Science, Australia for all. Abstract Type : Poster Abstract Category : Extragalactic astronomy Abstract : The haloes of spiral galaxies connect their inner disks to the inter galactic medium. Additionally they can serve as reservoirs of baryonic matter that can replenish the the star forming gas in the discs of galaxies. However, these haloes are hot with very long cooling times. Recent modelling shows that the cold gas in the halo, expelled by star formation in the disc, can serve as an catalyser in cooling down the hot halo. This makes the disc halo-connection a crucial element in understanding galaxy evolution and the continued star formation in spiral galaxies. Up to now research in this field has focussed on spiral galaxies, in which extra-planar cold gas has been observed often. However, in the last decade it has become clear that many that Early Type Galaxies (ETGs) also contain significant fractions of HI. As the star formation history of ETGs is significantly different from spiral galaxies provide an excellent opportunity to study the disc-halo connection from a completely new angle. One such ETG, ESO 92-G021, has been found to have a comparatively high rate of star formation and an extended, regular HI disk. In order to study whether this galaxy contains extra-planar neutral hydrogen we have obtained deep observations with the Australia Telescope Compact Array. Here we will show a detailed kinematical analysis of the HI disc in this galaxy. The model constructed in this analysis will enable us to separate the gas in the disc from any extra-planar gas that is present. |