2015MNRAS.453.2082D


C.D.S. - SIMBAD4 rel 1.7 - 2020.11.25CET07:07:38

2015MNRAS.453.2082D - Mon. Not. R. Astron. Soc., 453, 2082-2093 (2015/October-3)

Observations of Galactic star-forming regions with the Cosmic Background Imager at 31 GHz.

DEMETROULLAS C., DICKINSON C., STAMADIANOS D., HARPER S.E., CLEARY K., JONES M.E., PEARSON T.J., READHEAD A.C.S. and TAYLOR A.C.

Abstract (from CDS):

Studies of the diffuse Galactic radio emission are interesting both for better understanding the physical conditions in our Galaxy and for minimizing the contamination in cosmological measurements. Motivated by this, we present Cosmic Background Imager 31 GHz observations of the Galactic regions NGC 6357, NGC 6334, W51 and W40 at ∼ 4.5 arcmin resolution and conduct an investigation of the spectral emission process in the regions at 4.5 arcmin and 1° resolution. We find that most of the emission in the regions is due to optically thin free-free. For two sub-regions of NGC 6334 and for a sub-region of W51 though, at 4.5 arcmin resolution and at 31 GHz we detect less emission than expected from extrapolation of radio data at lower frequencies assuming a spectral index of -0.12 for optically thin free-free emission, at 3.3σ, 3.7σ and 6.5σ, respectively. We also detect excess emission in a sub-region of NCG 6334 at 6.4σ, after ruling out any possible contribution from ultra-compact Hii regions. At 1° resolution, we detect a spinning dust component in the spectral energy distribution of W40 that accounts for 18±7 percent of the total flux density in the region at the peak frequency of 37 GHz. Comparison with 100µm data indicates an average dust emissivity for the sub-regions of 0.5±4.4µK(MJy/sr)-1. Finally, we translate the excess emission in the regions to an anomalous microwave emission (AME) emissivity relative to the optical depth at 250µm. We find that this form of emissivity is independent of the AME significance and has a value somewhere in the order of 104 Jy.

Abstract Copyright: © 2015 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society (2015)

Journal keyword(s): radiation mechanisms: thermal - ISM: clouds - H II regions - Photodissociation region (PDR) - ISM: supernova remnants - radio continuum: ISM

Simbad objects: 25

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Number of rows : 25

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2021
#notes
1 M 1 SNR 05 34 31.94 +22 00 52.2           ~ 5670 4
2 NAME Car-Sgr Arm PoG 15 00 -40.0           ~ 434 1
3 NGC 6334A HII 17 20 19.3 -35 54 55           ~ 113 0
4 [KRL2007b] 236 AGN 17 20 21.81 -35 52 48.2           ~ 101 0
5 GAL 351.31+00.6 HII 17 20 31 -35 51.6           ~ 43 0
6 NGC 6334D HII 17 20 44.2 -35 49 18           ~ 36 0
7 NGC 6334 HII 17 20 51 -36 06.9           ~ 594 0
8 NGC 6334E HII 17 20 50.9 -35 46 06           ~ 50 0
9 NAME NGC 6334F (C) HII 17 20 53.45 -35 47 02.6           ~ 209 1
10 SNR G351.2+00.1 SNR 17 22 27 -36 11.0           ~ 33 0
11 NGC 6357B Rad 17 24 37 -34 09.8           ~ 3 0
12 Cl Pismis 24 OpC 17 24 43.0 -34 12 23   11.00 9.6     ~ 109 0
13 GAL 353.19+00.91 HII 17 24 48 -34 10.8           ~ 24 0
14 NAME AH03 J1725-34.4 OpC 17 25 32.0 -34 24 20           ~ 13 0
15 GAL 353.1+00.6 HII 17 25 37 -34 22.5           ~ 15 0
16 NGC 6357A Rad 17 25 37 -34 20.3           ~ 2 0
17 NGC 6357 HII 17 26.5 -34 12           ~ 252 0
18 LBN 028.77+03.43 HII 18 31 26.5 -02 04 22           ~ 190 2
19 NAME Sgr Arm PoG 19 00 -30.0           ~ 531 1
20 NAME W 51 GMC MoC 19 23 +14.6           ~ 20 0
21 SNR G049.1-00.1 SNR 19 23 19.300 +14 09 21.00           ~ 243 0
22 [OMN2000] Region 3 PoC 19 23 29.3 +14 31 38           ~ 152 0
23 W 51b SFR 19 23 32.8 +14 29 56           ~ 78 0
24 [WBN74] W 51 IRS 2 SFR 19 23 40.05 +14 31 07.1           ~ 255 0
25 W 51 SNR 19 23 50 +14 06.0           ~ 1156 1

    Equat.    Gal    SGal    Ecl

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2020.11.25-07:07:38

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