Other
Scientific paper
Jan 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010aas...21535401g&link_type=abstract
American Astronomical Society, AAS Meeting #215, #354.01; Bulletin of the American Astronomical Society, Vol. 42, p.537
Other
Scientific paper
We present Keck DEIMOS spectra of stars associated with three newly discovered tidal streams in the remote outer halo of the Andromeda spiral galaxy (M31). Two of these streams, Streams E and F (at Rproj 60 and 100 kpc, respectively, on the NW minor axis), were discovered by members of our collaboration in a deep, wide-field Subaru SuprimeCam imaging survey. The third stream (at Rproj 90 kpc near the SW major axis) was identified by others in their ongoing wide-field CFHT MegaCam survey. Spectroscopic and broadband photometric diagnostics (plus KPNO/Mosaic DDO51 photometry for the SW major axis stream) are used to distinguish between various categories of objects along the line of sight: red giant stars associated with the stream (kinematically cold), red giants in the general M31 field halo population (kinematically hot), and foreground/background contaminants (Milky Way dwarf stars and distant galaxies, respectively). We measure the surface brightness, mean velocity, velocity dispersion, and metallicity distribution of these three new tidal streams, based on spectroscopically confirmed secure red giant members. These measurements should be useful for constraining models of the tidal interactions that produced these streams (e.g. orbit and nature of progenitor). The properties of these new streams are viewed in the context of previously known tidal streams in the M31 halo. A comparison between the statistical properties of M31's tidal streams and state-of-the-art Lambda-CDM simulations provides insight into the details of the hierarchical formation process that leads to the growth of galaxy halos.
This research was funded by the National Science Foundation and NASA/STScI.
Beaton Rachael
Bullock James
Chiba Masashi
Fardal Mark
Geha Marla
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