1,355 research outputs found
Cold galaxies
We use 350 mu angular diameter estimates from Planck to test the idea that
some galaxies contain exceptionally cold (10-13 K) dust, since colder dust
implies a lower surface brightness radiation field illuminating the dust, and
hence a greater physical extent for a given luminosity. The galaxies identified
from their spectral energy distributions as containing cold dust do indeed show
the expected larger 350 mu diameters. For a few cold dust galaxies where
Herschel data are available we are able to use submillimetre maps or surface
brightness profiles to locate the cold dust, which as expected generally lies
outside the optical galaxy.Comment: 9 pages, 15 figures. Accepted for publication MNRA
Panchromatic radiation from galaxies as a probe of galaxy formation and evolution
I review work on modelling the infrared and submillimetre SEDs of galaxies.
The underlying physical assumptions are discussed and spherically symmetric,
axisymmetric, and 3-dimensional radiative transfer codes are reviewed. Models
for galaxies with Spitzer IRS data and for galaxies in the Herschel-Hermes
survey are discussed. Searches for high redshift infrared and submillimetre
galaxies, the star formation history, the evolution of dust extinction, and
constraints from source-counts, are briefly discussed.Comment: to be published in IAU Symposium 284 'The Spectral Energy
Distribution of Galaxies', Preston 2012, eds. R.J.Tiffs and C.C.Popesc
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