Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011aas...21720702g&link_type=abstract
American Astronomical Society, AAS Meeting #217, #207.02; Bulletin of the American Astronomical Society, Vol. 43, 2011
Astronomy and Astrophysics
Astronomy
Scientific paper
Trends in stellar kinematics in the inner regions of the Andromeda galaxy (M31) offer insight into the structure and formation of spiral galaxies. The synthesis of the SPLASH (Spectroscopic and Photometric Landscape of Andromeda's Stellar Halo) and PHAT (Panchromatic Hubble Andromeda Treasury) collaborations offers an unprecedented opportunity to understand the interplay between the assembly, star formation, and chemical enrichment histories of large disk galaxies.
This paper presents a preliminary exploration of the synergy between Keck/DEIMOS spectra and high-resolution multiband HST photometry. The PHAT observations consist of ACS/WST imaging in two optical filters, WFC3/UVIS imaging in two ultraviolet filters, and WFC3/IR imaging in two NIR filters. While the PHAT survey intends to cover a large contiguous region in M31's eastern quadrant, the Year 1 data obtained so far provide only limited spatial/spectral coverage. Various subpopulations of stars identified in this limited region are targeted for Keck spectroscopy: hot massive main-sequence stars; intermediate-age AGB stars; metal-poor intermediate-metallicity and metal-rich red giants; planetary nebulae; and X-ray sources (X-ray binaries, background QSO/AGNs, etc.) We present a comparison of the kinematical and spectroscopic characteristics of these stellar subpopulations.
Funding for this project was provided by NASA and NSF.
Bullock James
Cuillandre J.
Dalcanton Julianne J.
Dorman Claire E.
Gilbert Karoline
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