Welcome to the new version of CaltechAUTHORS. Login is currently restricted to library staff. If you notice any issues, please email coda@library.caltech.edu
Published April 20, 2010 | Published
Journal Article Open

Properties of Galactic Cirrus Clouds Observed by BOOMERANG


The physical properties of galactic cirrus emission are not well characterized. BOOMERANG is a balloon-borne experiment designed to study the cosmic microwave background at high angular resolution in the millimeter range. The BOOMERANG 245 and 345 GHz channels are sensitive to interstellar signals, in a spectral range intermediate between FIR and microwave frequencies. We look for physical characteristics of cirrus structures in a region at high galactic latitudes (b ~ –40°) where BOOMERANG performed its deepest integration, combining the BOOMERANG data with other available data sets at different wavelengths. We have detected eight emission patches in the 345 GHz map, consistent with cirrus dust in the Infrared Astronomical Satellite maps. The analysis technique we have developed allows us to identify the location and the shape of cirrus clouds, and to extract the flux from observations with different instruments at different wavelengths and angular resolutions. We study the integrated flux emitted from these cirrus clouds using data from Infrared Astronomical Satellite (IRAS), DIRBE, BOOMERANG and Wilkinson Microwave Anisotropy Probe in the frequency range 23-3000 GHz (13 mm-100 μm wavelength). We fit the measured spectral energy distributions with a combination of a gray body and a power-law spectra considering two models for the thermal emission. The temperature of the thermal dust component varies in the 7-20 K range and its emissivity spectral index is in the 1-5 range. We identified a physical relation between temperature and spectral index as had been proposed in previous works. This technique can be proficiently used for the forthcoming Planck and Herschel missions data.

Additional Information

© 2010 American Astronomical Society. Received 2009 July 28; accepted 2010 March 1; published 2010 March 29. The authors acknowledge Jean-Philippe Bernard, Robert Crittenden, Alessandro Melchiorri and Max Tegmark for useful discussions. M.V. acknowledges support from the Faculty of the European Space Astronomy Center (ESAC-ESA). This activity has been supported by Italian Space Agency contracts COFIS, BOOMERanG and HiGal (I/038/08/0). We are grateful to the referee for helpful comments.

Attached Files

Published - Veneziani2010p9924Astrophys_J.pdf


Files (1.6 MB)
Name Size Download all
1.6 MB Preview Download

Additional details

August 21, 2023
October 20, 2023