2005A&A...440..929L


C.D.S. - SIMBAD4 rel 1.7 - 2020.12.02CET10:43:21

2005A&A...440..929L - Astronomy and Astrophysics, volume 440, 929-936 (2005/9-4)

Radio spectral index study of the SNRs OA184 and VRO42.05.01.

LEAHY D. and TIAN W.

Abstract (from CDS):

New images of the Supernova Remnants (SNRs) OA184 and VRO42.05.01 are presented at 408MHz and 1420MHz, from the Canadian Galactic Plane Survey (CGPS) data. The SNRs' flux densities at both 408MHz and 1420MHz are found and corrected for flux densities from compact sources within the SNRs. The integrated flux density based spectral indices (Sν∝ν–α) are 0.25±0.03 for OA184 and 0.36±0.06 for VRO42.05.01. These agree with the respective T-T plot spectral indexes of 0.23±0.06 and 0.36±0.03. OA184's spectral index is smaller than previously published values. The older flux density values of OA184 from lower resolution data include contributions from a non-SNR ridge emission region and from compact sources within OA184. Subtracting these contributions results in a spectral index of 0.32±0.06 (38MHz to 2695MHz) or 0.28±0.06 (408MHz to 2695MHz). Correction of published flux densities for compact sources for VRO.42.05.01 results in a spectral index of 0.32±0.05 for 38MHz to 2695MHz. We also find spatial variations of spectral index. For OA184 α varies from 0.1 to 0.3 (with errors ≃0.1). For VRO42.05.01, the shell region has α=0.31 and the wing region has α=0.47 (with errors ≃0.03).

Abstract Copyright:

Journal keyword(s): ISM: supernova remnants - ISM: structure

Nomenclature: Table 1: [LT2005] OA184 NN (Nos 1-17), [LT2005] VRO42.05.01 N (Nos 1-3).

Errata: + erratum vol. 451, p.991 (2006)

Simbad objects: 22

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Number of rows : 22

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 SNR G166.2+02.5 SNR 05 19.0 +41 53           ~ 70 0
2 2FGL J0526.6+4308 Bla 05 26 30.000 +42 56 00.00           ~ 158 0
3 [LT2005] OA184 3 Rad ~ ~           ~ 1 0
4 [LT2005] OA184 4 Rad ~ ~           ~ 1 0
5 [LT2005] OA184 5 Rad ~ ~           ~ 1 0
6 [LT2005] OA184 6 Rad ~ ~           ~ 1 0
7 [LT2005] OA184 7 Rad ~ ~           ~ 1 0
8 [LT2005] OA184 8 Rad ~ ~           ~ 1 0
9 [LT2005] OA184 9 Rad ~ ~           ~ 1 0
10 [LT2005] OA184 10 Rad ~ ~           ~ 1 0
11 [LT2005] OA184 11 Rad ~ ~           ~ 1 0
12 [LT2005] OA184 1 Rad ~ ~           ~ 1 0
13 [LT2005] OA184 13 Rad ~ ~           ~ 1 0
14 [LT2005] OA184 14 Rad ~ ~           ~ 1 0
15 [LT2005] OA184 15 Rad ~ ~           ~ 1 0
16 [LT2005] OA184 16 Rad ~ ~           ~ 1 0
17 [LT2005] OA184 17 Rad ~ ~           ~ 1 0
18 [LT2005] VRO42.05.01 1 Rad ~ ~           ~ 1 0
19 [LT2005] VRO42.05.01 2 Rad ~ ~           ~ 1 0
20 [LT2005] VRO42.05.01 3 Rad ~ ~           ~ 1 0
21 [LT2005] OA184 12 Rad ~ ~           ~ 1 0
22 [LT2005] OA184 2 Rad ~ ~           ~ 1 0

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2020.12.02-10:43:21

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