2006A&A...447..937S


C.D.S. - SIMBAD4 rel 1.7 - 2020.10.30CET03:30:19

2006A&A...447..937S - Astronomy and Astrophysics, volume 447, 937-947 (2006/3-1)

New λ6 cm observations of the Cygnus Loop.

SUN X.H., REICH W., HAN J.L., REICH P. and WIELEBINSKI R.

Abstract (from CDS):

Radio continuum and polarization observations of the entire Cygnus Loop at λ6cm wavelength were made with the Urumqi 25m telescope. The λ6cm map is analysed together with recently published maps from the Effelsberg 100 m telescope at λ21cm and λ11cm. The integrated flux density of the Cygnus Loop at λ6 cm is 90±9Jy, which implies a spectral index of α=-0.40±0.06. This rules out any global spectral steepening up to λ6cm. However, small spectral index variations in some regions of the source are possible, but there are no indications for any spectral curvature. The linear polarization data at λ6cm show percentage polarizations up to 35% in some areas of the Cygnus Loop, exceeding those observed at λ11cm. The Rotation Measure is around -21rad/m2 in the southern area, which agrees with previous observations. However, the distribution of Rotation Measures is rather complex in the northern part of the Cygnus Loop, where the λ21cm emission is totally depolarized. Rotation Measures based on λ11cm and λ6cm data are significantly larger than in the southern part. The difference in the polarization characteristics between the northern and southern part supports previous ideas that the Cygnus Loop consists of two supernova remnants.

Abstract Copyright:

Journal keyword(s): ISM: magnetic fields - ISM: supernova remnants - radio continuum: ISM - techniques: polarimetric

Simbad objects: 11

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Number of rows : 11

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
#notes
1 SNR G180.0-01.7 SNR 05 39 00.000 +27 50 00.00           ~ 216 2
2 3C 286 Sy1 13 31 08.2885060664 +30 30 32.960825108   17.51 17.25     ~ 3777 1
3 NGC 6960 ISM 20 45 38.0 +30 42 30           ~ 63 0
4 [KWH73] 2 Rad 20 45 49 +32 33.7           ~ 2 0
5 2MASS J20493540+2938509 * 20 49 35.4141299594 +29 38 50.920395151     12.6     G 10 0
6 SNR G072.9-09.0 SNR 20 49.6 +29 33           ~ 7 0
7 5C 8.146 QSO 20 50 51.13147204 +31 27 27.3740758     19.7 15.9   ~ 81 1
8 NAME Cyg Loop SNR 20 51.0 +30 40           ~ 828 0
9 SNR G074.3-08.4 SNR 20 51.0 +31 03           ~ 5 0
10 NGC 6992 sh 20 56 19 +31 44.6           ~ 44 2
11 NGC 6995 ~ 20 57.0 +31 13           ~ 24 1

    Equat.    Gal    SGal    Ecl

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2020.10.30-03:30:19

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