Mapping Dust Across Kiloparsec-Scale Areas of M31 with the Panchromatic Hubble Andromeda Treasury (PHAT)

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Scientific paper

The Panchromatic Hubble Andromeda Treasury (PHAT) is a Hubble Space Telescope Multi-Cycle Treasury program to image 1/3 of M31 at HST resolution from the UV through the NIR. We use PHAT's NIR observations of red giant branch stars to characterize the dust distribution over many square kiloparsecs of the star forming disk, with a resolution of better than 50 parsecs. We demonstrate the effectiveness of our new mapping technique, and then compare the resulting dust maps to other probes of the interstellar medium. We find good agreement overall between these new high resolution extinction maps and other tracers of the cold ISM. However, we also see interesting departures that should yield insight into variations of the X_CO factor, particularly when combined with constraints available from the UV and optical stellar populations revealed by PHAT.

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