Studies of Dust Emission as Measured by DIRBE and IRAS

Details Studies of Dust Emission as Measured by DIRBE and IRAS Studies of Dust Emission as Measured by DIRBE and IRAS

Jan 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002stin...0266642d&link_type=abstract

Technical Report, California Univ. Berkeley, CA United States Dept. of Astronomy

Astronomy and Astrophysics

Astronomy

Cosmic Dust, Red Shift, Background Radiation, Astrography, Calibrating, Infrared Radiation, Astronomical Maps, Infrared Astronomy Satellite, Temperature Measurement, Submillimeter Waves, Microwaves, Satellite-Borne Instruments, Infrared Spectrophotometers

Scientific paper

The main activity supported by this grant was to make the dust reddening map more useful for optical and microwave astronomy, and to increase our understanding of interstellar dust in general. We completed all the major objectives of the proposal, and we are eagerly awaiting the launch of Space Infrared Telescope Facility (SIRTF) so that we can check one of our most controversial conclusions. According to the ADS abstract service, the above paper has been cited 895 times. A number of authors have claimed the SFD98 dust maps are miscalibrated, but recent work suggests that the calibration is correct. The primary goal of this ADP grant was to determine the microwave / sum-mm spectrum of interstellar dust emission by cross-correlating the Far Infrared Absolute Spectrophotometer (FIRAS) spectra with a model based on the SFD98 dust map. Because of temperature variation, large (factor of two) variations are observed in submillimeter / 100 micron ratio, so a careful accounting of dust temperature data, based on Diffuse Infrared Background Experiment (DIRBE) 100 and 240 micron channels, was required. Even this improvement was unable to reduce the chi(sup 2) per degree of freedom below 30. Further study revealed that a two-component model, with the two components having different (but reasonable) optical properties, achieved a decrease in chi(sup 2) to less than 2, five times better than the next best fit in the literature. The resulting model uses density and temperature estimates based on DIRBE data, with only four global parameters fit using the FIRAS data. This dramatic reduction in chi(sup 2) using only four fit parameters may indicate that the model is physically correct, but in any case, it is an acceptable phenomenological model. We have released the appropriate data and software on our website (http://astro.berkeley.edu/dust) to allow users to compute the interstellar dust emission between from 100-3000 GHz (or 100 micron 3 mm) with approx. 15% precision. The paper describing these efforts appeared in ApJ 524, 867. This paper has to date been cited 24 times.

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