3D Mapping Of Dusty Clouds In The Nuclear Bulge Of M31

Details 3D Mapping Of Dusty Clouds In The Nuclear Bulge Of M31 3D Mapping Of Dusty Clouds In The Nuclear Bulge Of M31

Jan 2012

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2012aas...21934609d&link_type=abstract

American Astronomical Society, AAS Meeting #219, #346.09

Astronomy and Astrophysics

Astronomy

Scientific paper

M31 provides the closest galactic nucleus in a giant spiral galaxy, where we can study in great detail from X-ray to radio. However, the interstellar material in the circum-nuclear region of the galaxy remains poorly understand. Here, we present a map of dusty clouds in the central 4x4 arcmin square region, constructed pixel-by-pixel via fitting the spectral energy distribution over the near-IR to UV range, using the nine images from HST WFC3 and ACS: 5 bands from the Panchromatic Hubble Andromeda Treasury survey (PHAT), 3 bands from our Cycle-18 nuclear spiral mapping, and 1 band from the archive. This fitting gives both the extinction and the line-of-sight location of the clouds in the galactic bulge. The map further allows us to estimate their sizes and densities, as well as their spatial distribution. These results have strong implications for understanding the formation and destruction processes of the clouds in the circum-nuclear region of the galaxy.

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