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Observations of SNR G156.2+5.7 at 6cm

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. System parameters/Calibrators. Central frequency: 4.8 GHz Bandwidth: 600 MHz System temperature: 22-25 K HPBW: 9.5 arcmin

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Observations of SNR G156.2+5.7 at 6cm

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  1. 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

  2. System parameters/Calibrators • Central frequency:4.8 GHz • Bandwidth:600 MHz • System temperature:22-25 K • HPBW:9.5 arcmin • Aperture efficiency:62% • Beam efficiency:67% • Conversion factor:0.164 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%

  3. Properties of SNR G156.2+5.7 • 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

  4. Some Parameters of SNR G156.2+5.7 • 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 E0 = 1051erg (Reich et al. 1992) • An age of   2.6104yr (Pfeffermann et al. 1991)

  5. G156.2+5.7 • r.m.s: 1.0 mK in I • Flux density:2.2+/-0.6Jy • polarization percentage : Left:<= 40%, Right:<=70% • one of the most weak SNRs • The red source in the • southwest with strongest • radio emission is probably • an extragalactic one Total intensity (image)

  6. G156.2+5.7 • r.m.s: 1.0 mK in I • Flux density:2.2+/-0.6Jy • polarization percentage : Left:<= 40%, Right:<=70% • one of the most weak SNRs • The red source in the • southwest with strongest • radio emission is probably • an extragalactic one Total intensity (image+contours)

  7. G156.2+5.7 • r.m.s: 1.0 mK in I • Flux density:2.2+/-0.6Jy • polarization percentage : Left:<= 40%, Right:<=70% • one of the most weak SNRs • small patchy of polarization • in the center • ---probably local structure Intensity (image) + B (bars) + Polarization Intensity (contours)

  8. G156.2+5.7 • r.m.s: 0.25 K TB in I • Flux density:4.2+/-1.0Jy • polarization percentage : unavailable • one of the most weak SNRs • The source in the southwest • with strongest radio emission • is probably an extragalactic • one Intensity (image+contours) (Reich et al. 1992)

  9. G156.2+5.7 • r.m.s: unavailable • Flux density:3.0+/-1.0Jy • polarization percentage : Left:<= 75%, Right:<=50% • one of the most weak SNRs • small patchy of polarization • in the center • ---probably local structure Intensity (image) + B (bars) + Polarization Intensity (contours)(Reich et al. 1992)

  10. G156.2+5.7 • r.m.s: 0.5 mK in PI • Flux density:2.2+/-0.6Jy • Polarization percentage : Left:<= 40%, Right:<=70% • one of the most weak SNRs • small patchy of polarization • in the center • ---probably local structure Polarization Intensity (contours)

  11. G156.2+5.7 • r.m.s: 0.5 mK in PI • Flux density:2.2+/-0.6Jy • polarization percentage : Left:<= 40%, Right:<=70% • one of the most weak SNRs • small patchy of polarization • in the center • ---probably local structure Polarization Intensity (contours) + B (bars)

  12. G156.2+5.7 • r.m.s: unavailable • Flux density:3.0+/-1.0Jy • polarization percentage : Left:<= 75%, Right:<=50% • one of the most weak SNRs • small patchy of polarization • in the center • ---probably local structure Polarization Intensity (contours) + B (bars) (Reich et al. 1992)

  13. G156.2+5.7 • 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% • one of the most weak SNRs • small patchy of polarization • in the center • ---probably local structure Polarization Percentage (contours)

  14. G156.2+5.7 Integrated flux densities --by open circle (derived from our observations) --by filled circle (taken from Reich et al. 1992) Spectral index  = 0.540.06 Radio spectrum at 4.8 GHz

  15. Summary Total flux density is 2.2  0.6 Jy at 4.8GHz Spectral index is  = 0.540.06 Surface brightness  = 2.910-22 W m-2 Hz-1 sr-1 at 4.8GHz

  16. Thank You

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