A 33 GHz VSA survey of the Galactic plane from 27 to 46 degrees
arXiv:1006.2770 · doi:10.1111/j.1365-2966.2010.16809.x
Abstract
The Very Small Array (VSA) has been used to survey the l = 27 to 46 deg, |b|<4 deg region of the Galactic plane at a resolution of 13 arcmin. The survey consists of 44 pointings of the VSA, each with a r.m.s. sensitivity of ~90 mJy/beam. These data are combined in a mosaic to produce a map of the area. The majority of the sources within the map are HII regions. We investigated anomalous radio emission from the warm dust in 9 HII regions of the survey by making spectra extending from GHz frequencies to the FIR IRAS frequencies. Acillary radio data at 1.4, 2.7, 4.85, 8.35, 10.55, 14.35 and 94 GHz in addition to the 100, 60, 25 and 12 micron IRAS bands were used to construct the spectra. From each spectrum the free-free, thermal dust and anomalous dust emission were determined for each HII region. The mean ratio of 33 GHz anomalous flux density to FIR 100 micron flux density for the 9 selected HII regions was 1.10 +/-0.21x10^(-4). When combined with 6 HII regions previously observed with the VSA and the CBI, the anomalous emission from warm dust in HII regions is detected with a 33 GHz emissivity of 4.65 +/- 0.4 micro K/ (MJy/sr) at 11.5σ. The anomalous radio emission in HII regions is on average 41+/-10 per cent of the radio continuum at 33 GHz.
18 pages, 11 figures, accepted for publication in MNRAS
References in corpus (9)
- Five-Year Wilkinson Microwave Anisotropy Probe (WMAP) Observations: Data Processing, Sky Maps, and Basic Results
- A refined model for spinning dust radiation
- Five-Year Wilkinson Microwave Anisotropy Probe (WMAP)Observations: Beam Maps and Window Functions
- The long-wavelength emission of interstellar PAHs: characterizing the spinning dust contribution
- VSA Observations of the Anomalous Microwave Emission in the Perseus Region
- CBI limits on 31 GHz excess emission in southern HII regions
- AMI limits on 15 GHz excess emission in northern HII regions
- AMI observations of Lynds Dark Nebulae: further evidence for anomalous cm-wave emission
- An upper limit on anomalous dust emission at 31 GHz in the diffuse cloud [LPH96]201.663+1.643
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