Detection of anomalous microwave emission in the perseus molecular cloud with the cosmosomas experiment

R. A. Watson; R. Rebolo; J. A. Rubiño-Martín; S. Hildebrandt; C. M. Gutiérrez; S. Fernández-Cerezo; R. J. Hoyland; E. S. Battistelli

doi:10.1086/430519

Detection of anomalous microwave emission in the perseus molecular cloud with the cosmosomas experiment

R. A. Watson, R. Rebolo, J. A. Rubiño-Martín, S. Hildebrandt, C. M. Gutiérrez, S. Fernández-Cerezo, R. J. Hoyland, E. S. Battistelli

Research output: Contribution to journal › Article › peer-review

Abstract

We present direct evidence for anomalous microwave emission in the Perseus molecular cloud, which shows a clear rising spectrum from 11 to 17 GHz in the data from the COSMOSOMAS experiment. By extending the frequency coverage using W ilkinson Microwave Anisotropy Probe maps convolved with the COSMOSOMAS scanning pattern, we reveal a peak flux density of 42 ± 4 Jy at 22 GHz integrated over an extended area of 1°.65 × 1°.0 centered on R.A. = 55°.4 ± 0°.1 and decl. = +31°.8 ± 0°.1 (J2000). The flux density that we measure at this frequency is nearly an order of magnitude higher than can be explained in terms of normal Galactic emission processes (synchrotron, free-free, and thermal dust). An extended IRAS dust feature, G159.6-18.5, is found near this position, and no bright unresolved source that could be an ultracompact H II region or gigahertz-peaked source could be found. An adequate fit for the spectral density distribution can be achieved from 10 to 50 GHz by including a very significant contribution from electric dipole emission from small spinning dust grains. © 2005. The American Astronomical Society. All rights reserved.

Original language	English
Pages (from-to)	L89-L92
Journal	Astrophysical Journal
Volume	624
Issue number	2
DOIs	https://doi.org/10.1086/430519
Publication status	Published - 10 May 2005

Keywords

Diffuse radiation
Dust, extinction
ISM: individual (G159.6-18.5)
Radiation mechanisms: general
Radio continuum: ISM

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10.1086/430519

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@article{83343ad93f16463893bcf1d4de345ec3,

title = "Detection of anomalous microwave emission in the perseus molecular cloud with the cosmosomas experiment",

abstract = "We present direct evidence for anomalous microwave emission in the Perseus molecular cloud, which shows a clear rising spectrum from 11 to 17 GHz in the data from the COSMOSOMAS experiment. By extending the frequency coverage using W ilkinson Microwave Anisotropy Probe maps convolved with the COSMOSOMAS scanning pattern, we reveal a peak flux density of 42 ± 4 Jy at 22 GHz integrated over an extended area of 1°.65 × 1°.0 centered on R.A. = 55°.4 ± 0°.1 and decl. = +31°.8 ± 0°.1 (J2000). The flux density that we measure at this frequency is nearly an order of magnitude higher than can be explained in terms of normal Galactic emission processes (synchrotron, free-free, and thermal dust). An extended IRAS dust feature, G159.6-18.5, is found near this position, and no bright unresolved source that could be an ultracompact H II region or gigahertz-peaked source could be found. An adequate fit for the spectral density distribution can be achieved from 10 to 50 GHz by including a very significant contribution from electric dipole emission from small spinning dust grains. {\textcopyright} 2005. The American Astronomical Society. All rights reserved.",

keywords = "Diffuse radiation, Dust, extinction, ISM: individual (G159.6-18.5), Radiation mechanisms: general, Radio continuum: ISM",

author = "Watson, {R. A.} and R. Rebolo and Rubi{\~n}o-Mart{\'i}n, {J. A.} and S. Hildebrandt and Guti{\'e}rrez, {C. M.} and S. Fern{\'a}ndez-Cerezo and Hoyland, {R. J.} and Battistelli, {E. S.}",

year = "2005",

month = may,

day = "10",

doi = "10.1086/430519",

language = "English",

volume = "624",

pages = "L89--L92",

journal = "Astrophysical Journal",

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TY - JOUR

T1 - Detection of anomalous microwave emission in the perseus molecular cloud with the cosmosomas experiment

AU - Watson, R. A.

AU - Rebolo, R.

AU - Rubiño-Martín, J. A.

AU - Hildebrandt, S.

AU - Gutiérrez, C. M.

AU - Fernández-Cerezo, S.

AU - Hoyland, R. J.

AU - Battistelli, E. S.

PY - 2005/5/10

Y1 - 2005/5/10

N2 - We present direct evidence for anomalous microwave emission in the Perseus molecular cloud, which shows a clear rising spectrum from 11 to 17 GHz in the data from the COSMOSOMAS experiment. By extending the frequency coverage using W ilkinson Microwave Anisotropy Probe maps convolved with the COSMOSOMAS scanning pattern, we reveal a peak flux density of 42 ± 4 Jy at 22 GHz integrated over an extended area of 1°.65 × 1°.0 centered on R.A. = 55°.4 ± 0°.1 and decl. = +31°.8 ± 0°.1 (J2000). The flux density that we measure at this frequency is nearly an order of magnitude higher than can be explained in terms of normal Galactic emission processes (synchrotron, free-free, and thermal dust). An extended IRAS dust feature, G159.6-18.5, is found near this position, and no bright unresolved source that could be an ultracompact H II region or gigahertz-peaked source could be found. An adequate fit for the spectral density distribution can be achieved from 10 to 50 GHz by including a very significant contribution from electric dipole emission from small spinning dust grains. © 2005. The American Astronomical Society. All rights reserved.

AB - We present direct evidence for anomalous microwave emission in the Perseus molecular cloud, which shows a clear rising spectrum from 11 to 17 GHz in the data from the COSMOSOMAS experiment. By extending the frequency coverage using W ilkinson Microwave Anisotropy Probe maps convolved with the COSMOSOMAS scanning pattern, we reveal a peak flux density of 42 ± 4 Jy at 22 GHz integrated over an extended area of 1°.65 × 1°.0 centered on R.A. = 55°.4 ± 0°.1 and decl. = +31°.8 ± 0°.1 (J2000). The flux density that we measure at this frequency is nearly an order of magnitude higher than can be explained in terms of normal Galactic emission processes (synchrotron, free-free, and thermal dust). An extended IRAS dust feature, G159.6-18.5, is found near this position, and no bright unresolved source that could be an ultracompact H II region or gigahertz-peaked source could be found. An adequate fit for the spectral density distribution can be achieved from 10 to 50 GHz by including a very significant contribution from electric dipole emission from small spinning dust grains. © 2005. The American Astronomical Society. All rights reserved.

KW - Diffuse radiation

KW - Dust, extinction

KW - ISM: individual (G159.6-18.5)

KW - Radiation mechanisms: general

KW - Radio continuum: ISM

U2 - 10.1086/430519

DO - 10.1086/430519

M3 - Article

SN - 1538-4357

VL - 624

SP - L89-L92

JO - Astrophysical Journal

JF - Astrophysical Journal

IS - 2

ER -

Detection of anomalous microwave emission in the perseus molecular cloud with the cosmosomas experiment

Abstract

Keywords

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