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Title:
HI in Local Group Dwarf Galaxies
Authors:
Grcevich, Jana; Putman, Mary; Peek, Joshua E. G.
Affiliation:
AA(830 Dennison Bldg., 500 Church St., University of Michigan, Ann Arbor, MI 48109-1042), AB(830 Dennison Bldg., 500 Church St., University of Michigan, Ann Arbor, MI 48109-1042), AC(601 Campbell Hall, University of California at Berkeley, Berkeley, CA 94720-3411)
Publication:
THE EVOLUTION OF GALAXIES THROUGH THE NEUTRAL HYDROGEN WINDOW. AIP Conference Proceedings, Volume 1035, pp. 159-162 (2008). (AIPC Homepage)
Publication Date:
08/2008
Origin:
AIP
PACS Keywords:
Dwarf galaxies, Astronomical and space-research instrumentation, Star formation, Stellar structure, interiors, evolution, nucleosynthesis, ages, Elliptical galaxies
DOI:
10.1063/1.2973571
Bibliographic Code:
2008AIPC.1035..159G

Abstract

The HI content of the newly discovered satellites of the Milky Way has not been previously studied. We use HIPASS (HI Parkes All Sky Survey), LAB (Leiden/Argentine/Bonn), and GALFA (Galactic Arecibo L-band Feed Array) survey data to explore HI in the environment of the newly discovered dwarf galaxies and add this information to what was previously known about HI in the dwarf spheroidal and lower mass dwarf irregular galaxies of the Local Group. All of the new satellites discovered in the Sloan Digital Sky Survey data have limits on their HI masses which range from <13 Msolar to 3×104 Msolar except for Leo T, which has and HI mass of approximately 105 Msolar. We find that galaxies within 300 kpc of the Milky Way or Andromeda are all undetected in HI to low limits, or have ambiguous detections, while those further than 300 kpc are predominantly detected with masses >105 Msolar. The most favored explanation for the lack of HI in dwarf galaxies at small galactocentric distances is ram pressure stripping of the gas in the dwarf galaxy by the larger galaxy's hot halo gas. Finally, we discuss the discovery in the GALFA data of discrete HI clouds with characteristics similar to known dwarf galaxies.
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