Astronomy and Astrophysics – Astrophysics
Scientific paper
2006-03-06
Astrophys.J. 643 (2006) L111-L114
Astronomy and Astrophysics
Astrophysics
5 pages, 3 figures, submitted to ApJL
Scientific paper
10.1086/505299
[LPH96]201.663+1.643, a diffuse H{\sc ii} region, has been reported to be a candidate for emission from rapidly spinning dust grains. Here we present Cosmic Background Imager (CBI) observations at 26-36 GHz that show no evidence for significant anomalous emission. The spectral index within the CBI band, and between CBI and Effelsberg data at 1.4/2.7 GHz, is consistent with optically thin free-free emission. The best-fitting temperature spectral index from 2.7 to 31 GHz, $\beta=-2.06 \pm 0.03$, is close to the theoretical value, $\beta=-2.12$ for $T_{e}=9100$ K. We place an upper limit of 24% ~ (2\sigma) for excess emission at 31 GHz as seen in a $6\arcmin$ FWHM beam. Current spinning dust models are not a good fit to the spectrum of LPH96. No polarized emission is detected in the CBI data with an upper limit of 2% on the polarization fraction.
Casassus Simon
Davies Rhodri D.
Dickinson Cameron
Pearson Timothy. J.
Pineda Jorge L.
No associations
LandOfFree
An upper limit on anomalous dust emission at 31 GHz in the diffuse cloud [LPH96]201.663+1.643 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 An upper limit on anomalous dust emission at 31 GHz in the diffuse cloud [LPH96]201.663+1.643, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and An upper limit on anomalous dust emission at 31 GHz in the diffuse cloud [LPH96]201.663+1.643 will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-365446