Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 2012
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2012aas...21920105g&link_type=abstract
American Astronomical Society, AAS Meeting #219, #201.05
Astronomy and Astrophysics
Astronomy
Scientific paper
It is highly likely that additional ultra-faint dwarf galaxies exist in the Local Group but are outside the coverage region or too far away to be discovered in the SDSS data. The discovery of additional Local Group dwarfs is important to understand the discrepancies between Lambda CDM substructure on small scales and the observed Local Group dwarf population. Since HI containing Local Group dwarf galaxies are more likely to be located at distances greater than 270 kpc from the Milky Way or M31, searching for dwarfs via their HI provides a complementary method of discovery to optical searches. I present HI identified candidates for previously undiscovered Local Group dwarf galaxies which were selected from a catalog of compact, isolated neutral hydrogen clouds identified in the GALFA-HI survey. Clouds were selected based on how well their observational characteristics matched those of known Local Group dwarf galaxies (in particular the characteristics of the only known ultra-faint galaxy to contain HI, Leo T), as well as their kinematic characteristics. I will also present an analysis of SDSS data at the position of those dwarf galaxy candidates which are within the current SDSS coverage region. The gas content of previously known Local Group dwarfs can also be used as an indirect probe of the extended hot gas halo of the Milky Way and hot Local Group medium. I will discuss the constraints placed on the Milky Way's hot halo via ram pressure arguments, as well as presenting mass-loss rates from hydrodynamic simulations of gas stripping in low mass dwarf galaxies. This research was partially funded by NSF grants AST-0917810 and AST-0904059
No associations
LandOfFree
HI in Local Group Dwarf Galaxies: A Method of Discovery for Ultra-faint Dwarfs and a Probe of the Galactic Hot Halo does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with HI in Local Group Dwarf Galaxies: A Method of Discovery for Ultra-faint Dwarfs and a Probe of the Galactic Hot Halo, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and HI in Local Group Dwarf Galaxies: A Method of Discovery for Ultra-faint Dwarfs and a Probe of the Galactic Hot Halo will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-1577370