The CMBR spectrum: new upper limits for the distortion parameters y and mu

Details The CMBR spectrum: new upper limits for the distortion parameters y and mu The CMBR spectrum: new upper limits for the distortion parameters y and mu

Apr 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000newa....5...77b&link_type=abstract

New Astronomy, vol. 5, no. 2, p. 77-90.

Astronomy and Astrophysics

Astronomy

6

Scientific paper

The CMBR Spectrum has been measured by the COBE-FIRAS experiment. Upper limits only have been found for distortion parameters y and mu: y^up=1.5 x 10^ - 5 and mu^up=9 x 10^ - 5 at 95% of confidence. FIRAS made differential measurements between sky and blackbody calibrator. The knowledge of its emissivity is important as far as y and mu measurements as concerned. We have re-estimated the XCAL emissivity by using Ray-Tracing techniques. Diffraction problems have been analyzed by a model based on waveguide approximation: it allowed us to define a propagation function tau inside the XCAL V-groove. The emission of the external calibrator distorted with respect to the Black-Body emission may result in lower upper limits to y and mu. New upper limits for distortion parameters y and mu have been calculated considering the new XCAL emissivity. The results are: y^up=3.1 x 10^ - 5 and mu^up=4.5 x 10^ - 4 at 95% of confidence.

Affiliated with

Also associated with

No associations

Rating

The CMBR spectrum: new upper limits for the distortion parameters y and mu does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with The CMBR spectrum: new upper limits for the distortion parameters y and mu, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and The CMBR spectrum: new upper limits for the distortion parameters y and mu will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1625463