2010MNRAS.402.1969T

Query : 2010MNRAS.402.1969T

2010MNRAS.402.1969T - Mon. Not. R. Astron. Soc., 402, 1969-1979 (2010/March-1)

Very small array observations of the anomalous microwave emission in the Perseus region.

TIBBS C.T., WATSON R.A., DICKINSON C., DAVIES R.D., DAVIS R.J., BUCKMASTER S., DEL BURGO C., FRANZEN T.M.O., GENOVA-SANTOS R., GRAINGE K., HOBSON M.P., PADILLA-TORRES C.P., REBOLO R., RUBINO-MARTIN J.A., SAUNDERS R.D.E., SCAIFE A.M.M. and SCOTT P.F.

Abstract (from CDS):

The dust complex G159.6-18.5 in the Perseus region has previously been observed with the COSMOSOMAS experiment on angular scales of ~1°, and was found to exhibit anomalous microwave emission. We present the first high angular resolution observations of this dust complex, performed with the Very Small Array (VSA) at 33GHz, to help increase the understanding of the nature of this anomalous emission.

On the angular scales observed with the VSA (~10-40arcmin), G159.6-18.5 consists of five distinct components, all of which are found to exhibit an excess of emission at 33GHz that is highly correlated with far-infrared emission. Within the region, we find a range of physical conditions: one of the features, which is associated with the reflection nebula IC 348, has a dust emissivity comparable to that of HII regions, while the other four features have values in agreement with previous observations of intermediate Galactic latitudes. We provide evidence that all of these compact components have anomalous emission that is consistent with electric dipole emission from very small, rapidly rotating dust grains. We find that these five components contribute ~10 per cent to the flux density of the diffuse extended emission detected by COSMOSOMAS, implying that the bulk of the anomalous emission in Perseus is diffuse and not concentrated in these compact components.


Abstract Copyright: © 2010 The Authors. Journal compilation © 2010 RAS

Journal keyword(s): radiation mechanisms: general - ISM: clouds - dust, extinction - ISM: individual: G159.6-18.5 - radio continuum: ISM

Nomenclature: Fig. 2, Table 3: [TWD2010] AN (Nos A1-A3, B-D).

Simbad objects: 19

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Number of rows : 19
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2026 		#notes
1 NGC 1333 OpC 03 29 09.2 +31 20 59           ~ 1575 1
2 NAME Perseus Cloud SFR 03 35.0 +31 13           ~ 1553 0
3 6C 033321+320838 Bla 03 36 30.10760267 +32 18 29.3422162     17.50 16.6   ~ 688 1
4 [TWD2010] C Rad 03 37 49.0 +31 27 57           ~ 1 0
5 HD 278942 ** 03 39 55.6857090240 +31 55 33.189519540   10.25 9.15     O9.5-B0 57 1
6 GAL 159.6-18.5 Rad 03 39 55.7 +31 55 33           ~ 35 1
7 3C 92 Rad 03 40 08.534 +32 09 02.22           ~ 28 1
8 [TWD2010] B Rad 03 40 41.0 +31 16 31           ~ 1 0
9 [TWD2010] D Rad 03 40 49.0 +31 54 38           ~ 1 0
10 Ass Per OB 2 As* 03 42.2 +33 26           ~ 350 0
11 4C 31.14 Rad 03 43 09.147 +31 15 15.81           ~ 10 1
12 [TWD2010] A3 Rad 03 43 14.0 +31 46 25           ~ 1 0
13 [TWD2010] A2 Rad 03 43 27.0 +32 00 17           ~ 1 0
14 [TWD2010] A1 Rad 03 44 30.0 +32 11 27           ~ 1 0
15 IC 348 OpC 03 44 31.1 +32 10 02           ~ 1476 1
16 M 1 SNR 05 34 31.8 +22 01 03           ~ 6516 1
17 LDN 1622 DNe 05 54 28 +01 48.2           ~ 110 0
18 RCW 175 HII 18 46.8 -03 45           ~ 27 0
19 LDN 1111 DNe 21 40 30.0 +57 48 00           ~ 16 0

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