Observations of SNR G156.2+5.7 at 6cm JianWen Xu, Li Xiao, XiaoHui Sun, Chen Wang, Wolfgang Reich, JinLin Han Partner Group of MPIfR at NAOC.

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Presentation transcript:

Observations of SNR G at 6cm JianWen Xu, Li Xiao, XiaoHui Sun, Chen Wang, Wolfgang Reich, JinLin Han Partner Group of MPIfR at NAOC

System parameters/Calibrators Central frequency: 4.8 GHz Bandwidth: 600 MHz System temperature: K HPBW: 9.5 arcmin Aperture efficiency: 62% Beam efficiency: 67% Conversion factor: K/Jy r.m.s: 1.5 mK for 1s integration tim Primary Calibrator: 3C138 –Intensity: 3.64 Jy, –Polarization Angle: 169 deg, –Polarization Percent: 11.7%

Properties of SNR G Identified firstly by the ROSAT observatory in the all- sky survey for X-ray sources Among the 10 brightest X-ray Galactic SNRs The lowest radio surface brightness among all known SNRs Common magnetic field strength & therefore a low electron density

Some Parameters of SNR G Spectral index  = 0.5  0.15 (Reich et al. 1992) A distance of d  3kpc (Pfeffermann et al. 1991) A diameter of 108’, or  95pc (Pfeffermann et al. 1991) Type I progenitor SN of E 0 = erg (Reich et al. 1992) An age of   2.6  10 4 yr (Pfeffermann et al. 1991)

r.m.s: 1.0 mK in I Flux density:2.2+/-0.6Jy polarization percentage : Left:<= 40%, Right:<=70% G one of the most weak SNRs The red source in the southwest with strongest radio emission is probably an extragalactic one Total intensity (image)

r.m.s: 1.0 mK in I Flux density:2.2+/-0.6Jy polarization percentage : Left:<= 40%, Right:<=70% G Total intensity (image+contours) one of the most weak SNRs The red source in the southwest with strongest radio emission is probably an extragalactic one

r.m.s: 1.0 mK in I Flux density:2.2+/-0.6Jy polarization percentage : Left:<= 40%, Right:<=70% G Intensity (image) + B (bars) + Polarization Intensity (contours) one of the most weak SNRs small patchy of polarization in the center ---probably local structure

r.m.s: 0.25 K T B in I Flux density:4.2+/-1.0Jy polarization percentage : unavailable G Intensity (image+contours) (Reich et al. 1992) one of the most weak SNRs The source in the southwest with strongest radio emission is probably an extragalactic one

r.m.s: unavailable Flux density:3.0+/-1.0Jy polarization percentage : Left:<= 75%, Right:<=50% G Intensity (image) + B (bars) + Polarization Intensity (contours)(Reich et al. 1992) one of the most weak SNRs small patchy of polarization in the center ---probably local structure

r.m.s: 0.5 mK in PI Flux density:2.2+/-0.6Jy Polarization percentage : Left:<= 40%, Right:<=70% G Polarization Intensity (contours) one of the most weak SNRs small patchy of polarization in the center ---probably local structure

r.m.s: 0.5 mK in PI Flux density:2.2+/-0.6Jy polarization percentage : Left:<= 40%, Right:<=70% G Polarization Intensity (contours) + B (bars) one of the most weak SNRs small patchy of polarization in the center ---probably local structure

r.m.s: unavailable Flux density:3.0+/-1.0Jy polarization percentage : Left:<= 75%, Right:<=50% G Polarization Intensity (contours) + B (bars) (Reich et al. 1992) one of the most weak SNRs small patchy of polarization in the center ---probably local structure

r.m.s: 1.0 mK in I, 0.5 mK in PI Flux density:2.2+/-0.6Jy polarization percentage : Left:<= 40%, Right:<=70% G Polarization Percentage (contours) one of the most weak SNRs small patchy of polarization in the center ---probably local structure

Integrated flux densities --by open circle (derived from our observations) --by filled circle (taken from Reich et al. 1992) G Radio spectrum at 4.8 GHz Spectral index  = 0.54  0.06

Summary Total flux density is 2.2  0.6 Jy at 4.8GHz Spectral index is  = 0.54  0.06 Surface brightness  = 2.9  W m -2 Hz -1 sr -1 a t 4.8GHz

Thank You