The Stellar and Gaseous Contents of the Orion Dwarf Galaxy

Details The Stellar and Gaseous Contents of the Orion Dwarf Galaxy The Stellar and Gaseous Contents of the Orion Dwarf Galaxy

Jan 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009aas...21341901h&link_type=abstract

American Astronomical Society, AAS Meeting #213, #419.01; Bulletin of the American Astronomical Society, Vol. 41, p.233

Astronomy and Astrophysics

Astronomy

Scientific paper

We present new optical and VLA HI spectral line observations of the Orion dwarf galaxy. This nearby (D 4 Mpc), intermediate-mass (Mdyn 7x109 solar mass) dwarf is highly dark matter dominated: comparing the 1.9x108 solar masses of detected neutral gas with estimates of the stellar mass from optical and near-infrared imaging (2x108 solar masses) implies a mass-to-light ratio >10. We explore the rich gas kinematics, where solid-body rotation dominates and the rotation curve is flat out to the observed edge of the HI disk ( 5 kpc). While new Hα observations show only modest-strength current star formation ( 0.015 solar masses per year), we have discovered a number of prominent holes and depressions in the ISM of this system. We discuss various scenarios that could explain these properties, including mechanical feedback from recent star formation.

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