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

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

    Research output: Contribution to journalArticleScientificpeer-review

    69 Citations (Scopus)

    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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    title = "Planck early results. XX: New light on anomalous microwave emission from spinning dust grains",
    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.",
    keywords = "Galaxy: general, ISM: general, radiation mechanisms, general, radio continuum, ISM, submillimeter: ISM",
    author = "P.A.R. Ade and N. Aghanim and M. Arnaud and Jussi Tuovinen and Jussi Varis and C. Dickinson and {Planck Collaboration}",
    note = "Project code: 18080",
    year = "2011",
    doi = "10.1051/0004-6361/201116470",
    language = "English",
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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 -