Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 2012
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2012aas...21934927s&link_type=abstract
American Astronomical Society, AAS Meeting #219, #349.27
Astronomy and Astrophysics
Astronomy
Scientific paper
M 31, the nearest massive galaxy, affords a unique opportunity to study the energy balance of the star-formation (SF) process on the spatial scales (<50 pc) of individual SF regions. For the `heating terms', UV to near-IR data from the Pan-chromatic Hubble Andromeda Treasury (PHAT) provide a direct census of all young stars in M 31; for the `cooling terms', we have compiled an unprecedented set of multi-wavelength data to trace the thermal state of ISM gas and dust across its multiple phases. This dataset includes far-IR and sub-mm broadband mapping across the whole disk of M 31 using the PACS and SPIRE instruments on Herschel to trace the dust spectral energy distribution; PACS spectroscopy in several regions of the key far-IR cooling lines--[CII] 158 μm and [OI] 63 μm --to trace the thermal state of neutral ISM gas; and fully-sampled optical integral-field spectroscopy from 3700-7100 Angstrom covering the same fields to probe the excitation and structure of ionized gas. The combination of these surveys will allow us to trace UV photons from their origin in massive stars through their various paths to heating ISM dust and gas. In this poster we present early results using the PACS and SPIRE photometry to study the heating of dust by different age stellar populations in the bulge and disk of M 31.
Dalcanton Julianne J.
Gordon Karl
Groves Brent
Kapala M.
Krause Oliver
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