Astronomy and Astrophysics – Astronomy
Scientific paper
Sep 1999
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999aj....118.1235s&link_type=abstract
The Astronomical Journal, Volume 118, Issue 3, pp. 1235-1244.
Astronomy and Astrophysics
Astronomy
37
Galaxies: Dwarf, Galaxies: Individual: Name: Phoenix Dwarf, Ism: H I, Galaxies: Local Group, Techniques: Interferometric
Scientific paper
New results are presented for a mosaic mapping of the H I in the field of the Local Group dwarf galaxy Phoenix. The observations, obtained with the Australia Telescope Compact Array, cover an area of ~2^degx2^deg. Four velocity components are identified, at heliocentric velocities of -23, 7, 59, and 140 km s^-1. While the gas at 7 km s^-1 is of Galactic origin and the gas at 140 km s^-1 is most likely associated with the Magellanic Stream, the situation for the two other components is unsure. However, it is suggested that the component at -23 km s^-1 is probably associated with Phoenix because: (1) it has a compact structure and is only slightly offset from the optical image, (2) its H I mass of ~10^5 M_solar is what can be expected in such a system, 3) it has a definite velocity gradient, (4) its location west of Phoenix is compatible with the already suspected self-propagation from east to west of the last star formation episode. Because of the large mass (~5x10^6 M_solar) implied if at the distance of Phoenix and also because of its large extent, the component at +59 km s^-1 is most likely not associated. Optical velocities are still needed to confirm or not those possible associations.
Carignan Claude
Cote Stephanie
Oosterloo Tom
St-Germain Julie
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