2011A&A...532A.144G


C.D.S. - SIMBAD4 rel 1.7 - 2020.07.04CEST13:40:15

2011A&A...532A.144G - Astronomy and Astrophysics, volume 532A, 144-144 (2011/8-1)

A sino-german λ6 cm polarization survey of the galactic plane. VI. Discovery of supernova remnants G178.2-4.2 and G25.1-2.3.

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

Abstract (from CDS):

Supernova remnants (SNRs) were often discovered in radio surveys of the Galactic plane. Because of the surface-brightness limit of previous surveys, more faint or confused SNRs await discovery. The Sino-German λ6cm Galactic plane survey is a sensitive survey with the potential to detect new low-surface-brightness SNRs. We aim to identify new SNRs from the λ6cm survey map of the Galactic plane. We searched for new shell-like objects in the λ6cm survey maps and studied their radio emission, polarization, and spectra using the λ6cm maps together with the λ11cm and λ21cm Effelsberg observations. Extended polarized objects with non-thermal spectra can be identified as SNRs. We have discovered two new, large, faint SNRs, G178.2-4.2 and G25.1-2.3, both of which show shell structure. G178.2-4.2 has a size of 72'x62' with strongly polarized emission being detected along its northern shell. The spectrum of G178.2-4.2 is non-thermal, with an integrated spectral index of α=-0.48±0.13. Its surface brightness is Σ1GHz=7.2x10–23W/m2/Hz/sr, which makes G178.2-4.2 the second faintest known Galactic SNR. G25.1-2.3 is revealed by its strong southern shell, which has a size of 80'x30'. It has a non-thermal radio spectrum with a spectral index of α=-0.49±0.13. Two new large shell-type SNRs have been detected at λ6cm in an area of 2200 deg2 along the Galactic plane. This demonstrates that more large and faint SNRs exist, but are very difficult to detect.

Abstract Copyright:

Journal keyword(s): ISM: supernova remnants - ISM: individual objects: G178.2-4.2 - ISM: individual objects: G25.1-2.3 - radio continuum: ISM

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 G156.2+05.7 SNR 04 58 51.300 +51 50 28.00           ~ 110 1
2 3CR 139.2 Rad 05 24 27.1 +28 12 47           ~ 48 1
3 NVSS J052432+281313 Rad 05 24 32.45 +28 13 13.7           ~ 1 0
4 SNR G178.2-04.2 SNR 05 25 +28.2           ~ 11 0
5 NVSS J052734+285134 Rad 05 27 34.90 +28 51 34.4           ~ 4 1
6 SNR G180.0-01.7 SNR 05 39 00.000 +27 50 00.00           ~ 213 2
7 PKS 0607+17 Rad 06 09.3 +17 20           ~ 45 1
8 3C 286 Sy1 13 31 08.2885060664 +30 30 32.960825108   17.51 17.25     ~ 3715 1
9 NVSS J184245-075613 Rad 18 42 45.59 -07 56 13.6           ~ 1 0
10 PMN J1842-0756 Rad 18 42 48.70 -07 56 06.0           ~ 6 1
11 SNR G025.1-02.3 SNR 18 45 10 -08 00.0           ~ 10 0

    Equat.    Gal    SGal    Ecl

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2020.07.04-13:40:15

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