Author | dc.contributor.author | Casassus Montero, Simón | |
Admission date | dc.date.accessioned | 2013-01-15T13:40:49Z | |
Available date | dc.date.available | 2013-01-15T13:40:49Z | |
Publication date | dc.date.issued | 2011-12 | |
Cita de ítem | dc.identifier.citation | ASTRONOMY & ASTROPHYSICS Volume: 536 Article Number: A20 Published: DEC 2011 | es_CL |
Identifier | dc.identifier.issn | 0004-6361 | |
Identifier | dc.identifier.other | DOI: 10.1051/0004-6361/201116470 | |
Identifier | dc.identifier.uri | https://repositorio.uchile.cl/handle/2250/125744 | |
General note | dc.description | Artículo de publicación ISI | es_CL |
Abstract | dc.description.abstract | Anomalous microwave emission (AME) has been observed by numerous experiments in the frequency range similar to 10-60 GHz. Using Planck maps and multi-frequency ancillary data, we have constructed spectra for two known AME regions: the Perseus and rho Ophiuchi molecular clouds. The spectra are well fitted by a combination of free-free radiation, cosmic microwave background, thermal dust, and electric dipole radiation from small spinning dust grains. The spinning dust spectra are the most precisely measured to date, and show the high frequency side clearly for the first time. The spectra have a peak in the range 20-40 GHz and are detected at high significances of 17.1 sigma for Perseus and 8.4 sigma for rho Ophiuchi. In Perseus, spinning dust in the dense molecular gas can account for most of the AME; the low density atomic gas appears to play a minor role. In rho Ophiuchi, the similar to 30 GHz peak is dominated by dense molecular gas, but there is an indication of an extended tail at frequencies 50-100 GHz, which can be accounted for by irradiated low density atomic gas. The dust parameters are consistent with those derived from other measurements. We have also searched the Planck map at 28.5 GHz for candidate AME regions, by subtracting a simple model of the synchrotron, free-free, and thermal dust. We present spectra for two of the candidates; S140 and S235 are bright H II regions that show evidence for AME, and are well fitted by spinning dust models. | es_CL |
Patrocinador | dc.description.sponsorship | NASA Office of Space Science
National Aeronautics and Space Administration (NASA)
ESA
CNES
CNRS/INSU-IN2P3-INP (France)
ASI
CNR
INAF (Italy)
DoE (USA)
STFC
UKSA (UK)
CSIC
MICINN
JA (Spain)
Tekes
AoF
CSC (Finland)
DLR
MPG (Germany)
CSA (Canada)
DTU Space (Denmark)
SER/SSO (Switzerland)
RCN (Norway)
SFI (Ireland)
FCT/MCTES (Portugal)
DEISA (EU) | es_CL |
Lenguage | dc.language.iso | en | es_CL |
Publisher | dc.publisher | EDP SCIENCES S A | es_CL |
Keywords | dc.subject | ISM: general | es_CL |
Título | dc.title | Planck early results. XX. New light on anomalous microwave emission from spinning dust grains | es_CL |
Document type | dc.type | Artículo de revista | |