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Panchromatic Hubble Andromeda Treasury XII. Mapping Stellar Metallicity Distributions in M31
Dylan Gregersen, Anil C. Seth, Benjamin F. Williams +14
We present a study of spatial variations in the metallicity of old red giant branch stars in the Andromeda galaxy. Photometric metallicity estimates are derived by interpolating is…
The Panchromatic Hubble Andromeda Treasury VIII: A Wide-Area, High-Resolution Map of Dust Extinction in M31
Julianne J. Dalcanton, Morgan Fouesneau, David W. Hogg +15
We map the distribution of dust in M31 at 25pc resolution, using stellar photometry from the Panchromatic Hubble Andromeda Treasury. We develop a new mapping technique that models…
Quasar Probabilities and Redshifts from WISE mid-IR through GALEX UV Photometry
M. A. DiPompeo, J. Bovy, A. D. Myers +1
Extreme deconvolution (XD) of broad-band photometric data can both separate stars from quasars and generate probability density functions for quasar redshifts, while incorporating…
A Global Star Forming Episode in M31 2-4 Gyr Ago
Benjamin F. Williams, Julianne J. Dalcanton, Andrew E. Dolphin +9
We have identified a major global enhancement of star formation in the inner M31 disk that occurred between 2-4 Gyr ago, producing 60% of the stellar mass formed in the past…