Extrapolation of Galactic Dust Emission at 100 Microns to CMBR Frequencies Using FIRAS

Details Extrapolation of Galactic Dust Emission at 100 Microns to CMBR Frequencies Using FIRAS Extrapolation of Galactic Dust Emission at 100 Microns to CMBR Frequencies Using FIRAS

1999-05-11

arxiv.org/abs/astro-ph/9905128v1

Astrophys.J. 524 (1999) 867-886

Astronomy and Astrophysics

Astrophysics

48 pages, AAS LaTeX, 6 figures, ApJ (accepted). Data described in the text, as well as 4 additional figures, are available at

Scientific paper

10.1086/307852

We present predicted full-sky maps of submillimeter and microwave emission from the diffuse interstellar dust in the Galaxy. These maps are extrapolated from the 100 micron emission and 100/240 micron flux ratio maps that Schlegel, Finkbeiner, & Davis (1998; SFD98) generated from IRAS and COBE/DIRBE data. Results are presented for a number of physically plausible emissivity models. We find that no power law emissivity function fits the FIRAS data from 200 - 2100 GHz. In this paper we provide a formalism for a multi-component model for the dust emission. A two-component model with a mixture of silicate and carbon-dominated grains (motivated by Pollack et al., 1994}) provides a fit to an accuracy of about 15% to all the FIRAS data over the entire high-latitude sky. Small systematic differences are found between the atomic and molecular phases of the ISM. Our predictions for the thermal (vibrational) emission from Galactic dust at \nu < 3000 GHz are available for general use. These full-sky predictions can be made at the DIRBE resolution of 40' or at the higher resolution of 6.1 arcmin from the SFD98 DIRBE-corrected IRAS maps.

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