BLAST05: Power Spectra of Bright Galactic Cirrus at Submillimeter Wavelengths

Abstract

We report multi-wavelength power spectra of diffuse Galactic dust emission from BLAST observations at 250, 350, and 500 microns in Galactic Plane fields in Cygnus X and Aquila. These submillimeter power spectra statistically quantify the self-similar structure observable over a broad range of scales and can be used to assess the cirrus noise which limits the detection of faint point sources. The advent of submillimeter surveys with the Herschel Space Observatory makes the wavelength dependence a matter of interest. We show that the observed relative amplitudes of the power spectra can be related through a spectral energy distribution (SED). Fitting a simple modified black body to this SED, we find the dust temperature in Cygnus X to be 19.9 +/- 1.3 K and in the Aquila region 16.9 +/- 0.7 K. Our empirical estimates provide important new insight into the substantial cirrus noise that will be encountered in forthcoming observations.

Submitted to the Astrophysical Journal. Maps and other data are available at http://blastexperiment.info/

References in corpus (4)

• The Balloon-borne Large Aperture Submillimeter Telescope: BLAST
• Statistical properties of dust far-infrared emission
• SANEPIC: A Map-Making Method for Timestream Data From Large Arrays
• The Balloon-borne Large Aperture Submillimeter Telescope (BLAST) 2005: Calibration and Targeted Sources

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• The $AKARI$ Far-Infrared All-Sky Survey Maps
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• An accurate measurement of the anisotropies and mean level of the Cosmic Infrared Background at 100 and 160 um
• Herschel-ATLAS: Statistical Properties of Galactic Cirrus in the GAMA-9 Hour Science Demonstration Phase Field
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