Planck early results. XX: New light on anomalous microwave emission from spinning dust grains

Jussi Tuovinen, Jussi Varis, C. Dickinson (Corresponding Author), Planck Collaboration

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Abstract

Anomalous microwave emission (AME) has been observed by numerous experiments in the frequency range  ~10–60 GHz. Using Planck maps and multi-frequency ancillary data, we have constructed spectra for two known AME regions: the Perseus and ρ 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 17.1σ for Perseus and 8.4σ for ρ 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 ρ Ophiuchi, the  ~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 Hii regions that show evidence for AME, and are well fitted by spinning dust models.
Original languageEnglish
Article numberA20
Number of pages17
JournalAstronomy and Astrophysics
Volume536
DOIs
Publication statusPublished - 2011
MoE publication typeA1 Journal article-refereed

Fingerprint

microwave emission
metal spinning
dust
rarefied gases
monatomic gases
molecular gases
gas
cosmic microwave background radiation
microwave
molecular clouds
electric dipoles
synchrotrons
indication
frequency ranges
radiation

Keywords

  • Galaxy: general
  • ISM: general
  • radiation mechanisms
  • general
  • radio continuum
  • ISM
  • submillimeter: ISM

Cite this

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abstract = "Anomalous microwave emission (AME) has been observed by numerous experiments in the frequency range  ~10–60 GHz. Using Planck maps and multi-frequency ancillary data, we have constructed spectra for two known AME regions: the Perseus and ρ 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 17.1σ for Perseus and 8.4σ for ρ 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 ρ Ophiuchi, the  ~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 Hii regions that show evidence for AME, and are well fitted by spinning dust models.",
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author = "P.A.R. Ade and N. Aghanim and M. Arnaud and Jussi Tuovinen and Jussi Varis and C. Dickinson and {Planck Collaboration}",
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Planck early results. XX : New light on anomalous microwave emission from spinning dust grains. / Tuovinen, Jussi; Varis, Jussi; Dickinson, C. (Corresponding Author); Planck Collaboration.

In: Astronomy and Astrophysics, Vol. 536, A20, 2011.

Research output: Contribution to journalArticleScientificpeer-review

TY - JOUR

T1 - Planck early results. XX

T2 - New light on anomalous microwave emission from spinning dust grains

AU - Ade, P.A.R.

AU - Aghanim, N.

AU - Arnaud, M.

AU - Tuovinen, Jussi

AU - Varis, Jussi

AU - Dickinson, C.

AU - Planck Collaboration

N1 - Project code: 18080

PY - 2011

Y1 - 2011

N2 - Anomalous microwave emission (AME) has been observed by numerous experiments in the frequency range  ~10–60 GHz. Using Planck maps and multi-frequency ancillary data, we have constructed spectra for two known AME regions: the Perseus and ρ 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 17.1σ for Perseus and 8.4σ for ρ 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 ρ Ophiuchi, the  ~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 Hii regions that show evidence for AME, and are well fitted by spinning dust models.

AB - Anomalous microwave emission (AME) has been observed by numerous experiments in the frequency range  ~10–60 GHz. Using Planck maps and multi-frequency ancillary data, we have constructed spectra for two known AME regions: the Perseus and ρ 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 17.1σ for Perseus and 8.4σ for ρ 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 ρ Ophiuchi, the  ~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 Hii regions that show evidence for AME, and are well fitted by spinning dust models.

KW - Galaxy: general

KW - ISM: general

KW - radiation mechanisms

KW - general

KW - radio continuum

KW - ISM

KW - submillimeter: ISM

U2 - 10.1051/0004-6361/201116470

DO - 10.1051/0004-6361/201116470

M3 - Article

VL - 536

JO - Astronomy and Astrophysics

JF - Astronomy and Astrophysics

SN - 0004-6361

M1 - A20

ER -