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The Galaxy's Eating Habits

Published online by Cambridge University Press:  26 May 2016

M. E. Putman ,
C. Thom ,
B. K. Gibson  and
L. Staveley-Smith
M. E. Putman
Affiliation:
Center for Astrophysics and Space Astronomy, University of Colorado, Boulder, CO 80309-0389, USA
C. Thom
Affiliation:
Centre for Astrophysics & Supercomputing, Swinburne University, Hawthorn, VIC 3122, Australia
B. K. Gibson
Affiliation:
Centre for Astrophysics & Supercomputing, Swinburne University, Hawthorn, VIC 3122, Australia
L. Staveley-Smith
Affiliation:
Australia Telescope National Facility, CSIRO, P.O. Box 76, Epping, NSW 1710, Australia

Abstract

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The possibility of a gaseous halo stream which was stripped from the Sagittarius dwarf galaxy is presented. The total mass of the neutral hydrogen along the orbit of the Sgr dwarf in the direction of the Galactic Anti-Center is 4 − 10 × 106 M⊙ (at 36 kpc, the distance to the stellar debris in this region). Both the stellar and gaseous components have negative velocities in this part of the sky, but the gaseous component extends to higher negative velocities. We suggest this gaseous stream was stripped from the main body of the dwarf 0.2 – 0.3 Gyr ago during its current orbit after a passage through a diffuse edge of the Galactic disk with a density > 10−4 cm−3. The gas would then represent the dwarf's last source of star formation fuel and explains how the galaxy was forming stars 0.5-2 Gyr ago.

Type
Part 3. Ejection and Outflow
Information
Symposium - International Astronomical Union , Volume 217: Recycling Intergalactic and Interslettar Matter , 2004 , pp. 406 - 411
Copyright
Copyright © Astronomical Society of the Pacific 2004 

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