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Primary results of polarization survey of large-SNRs at 6cm

Primary results of polarization survey of large-SNRs at 6cm. Li Xiao, XiaoHui Sun, Chen Wang, WeiBin Shi, Wolfgang Reich, JinLin Han Partner Group of MPIfR at NAOC. outlines. System parameter of Urumqi 25m telescope How we choose the observation target? The large-SNRs observation list

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Primary results of polarization survey of large-SNRs at 6cm

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  1. Primary results of polarization survey of large-SNRs at 6cm Li Xiao, XiaoHui Sun, Chen Wang, WeiBin Shi, Wolfgang Reich, JinLin Han Partner Group of MPIfR at NAOC

  2. outlines • System parameter of Urumqi 25m telescope • How we choose the observation target? • The large-SNRs observation list • preliminary results • The future work

  3. System parameters/Calibrators • Central frequency:4800 MHz • 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 time • Primary Calibrator:3C286 • Intensity: 7.5 Jy, • Polarization Angle: 33 deg, • Polarization Percent: 11.3%

  4. How we choose the observation target? • Urumqi 25m telescope observation condition: DEC>-30 deg • 111 SNRs at dec >-30 deg (D.A.Green cataloge) • Object scale : X>80’ or X+Y>120’, • Our target is 19 large-SNRs (15 already observed)

  5. the large-SNRs observation list Name Size Scan size obs.times • G28.8+1.5 100 3*3 0 • G39.7-2.0(W50, SS433) 120*60 3*3 0 • G65.1+0.6 90*50 3*3 1 • G69.0+2.7(CTB80)80 3*3 2 • G74.0-8.5(Cygnus loop) 230*160 4.2*4.8 5 • G82.2+5.3(W63) 95*65 4.2*4.2 4 • G89.0+4.7(HB21) 120*90 3*3 6 • G93.7-0.2(CTB104A, DA551) 80 3*3 6 • G114.3+0.3 90*55 3*3 4 • G116.5+1.1 80*60 3*3 4 • G119.5+10.2(CTA1) 90 3*3 7 • G126.2+1.6 & G127.1+0.5 70 4*4 4 • G132.7+1.3(HB3) 80 5*5 4 • G156.2+5.7 110 3*3 8 • G160.9+2.6(HB9) 140*120 4*4 6 • G166.2+2.5OA184 90*70 5*5 4 • G180-1.7(S147) 180 5*5 2 • G205.5+0.5 220 5*5 0

  6. Preliminary result • W63 • HB21 • HB9 • G156.2+5.7 • G114.3+0.3 • G116.5+1.1 10 good maps reduced in all • CTB104A (G93.7+0.2) • Cygnus loop(G74.0-8.5) • G126.2+1.6 & G127.1+0.5 • CTA1 (G119.5+10.2)

  7. W63 (G82.5+5.3) Size: 95’X65’; Type:S; Dist:1.3~1.9 kpc • Previous Observations: • Radio: the remnant locates in the Cygnus X complex. It displays a non-circular ,elliptical shape in radio map • Optical: in complex region, but spectra indicate SNR filaments • X-rays: Einstein and ROSAT detected • Our Observation • 3 coverages • Flux density: 46 +/- 5 Jy • First complete map at highest frequency up to data

  8. ROSAT image (soft X-ray) + radio contours(326Mhz) 326Mhz (Rengelink et al. 1997) 5Ghz (Angerhofer et al. 1977) Effelsberg 100m 2.7Mhz (Reich et al. 2003)

  9. HB21 (G89.0+4.7)Size: 120’ X 90’; Type: S; Distance: 0.8 kpc; • Previous observation: • Radio: distorted shell; 4C50.52, an extragalactic double within the boundary of the remnants • Optical: filaments possibly associated • X-rays: Centrally brightended • Our observation: • 4 coverages • Flux density:114 +/- 11 Jy • First Total Intensity and Polarization observation at highest frequency up to data

  10. 408Mhz (Tatematsu et al. 1990) ROSAT image (leahy et al. 1996) 11cm (haslam et al. 1975) 35cm (Reich et al. 2003)

  11. HB9 (G160.9+2.6)Size: 140’X120’; Type: S; Dist: 4kpc • Previous Observations: • Radio: large, filamentary shell; Pulsar within boundary of the remnant, plus several nearby compact sources • Optical: incomplete shell • X-rays: Centrally brightened • Our Observation • 4 coverages • Flux density: 35 +/- 4 Jy • First Polarization observation at highest frequency up to data

  12. 4.7Ghz (leahy et al. 1998) 863Mhz (Reich et al. 2003) ROSAT image (leahy et al. 1995) 151Mhz (leahy et al. 1998)

  13. CTB104A (G93.7+0.2)Size: 80’; Type: S; Dist: 1.5kpc • Previous Observations: • Radio: faint shell, distorted with many protrusions,radio source in north is SNR 3C434.1, in south is HII region • X-rays: no detected • Our Observation: • 3 coverages • Flux density: 26 +/- 3 Jy; • The sensitivity 10 times larger than the previous observation at 4.75Ghz

  14. 4.75Ghz (Mantovani et al. 1991) 2.7Ghz (Velusamy & Kundu 1974) 1.7Ghz (Mantovani et al. 1982) 1.4Ghz 408Mhz

  15. G114.3+0.3Size: 90’X55’; Type: S; Dist: 3.0~3.8kpc • Previous Observations: • Radio: shell, with HII region S165 within the boundary of the remnant. Plusar 2334+61 near centre of remnant. • Optical: faint emission in centre and to S. • X-rays: no detected • Our Observation: • 3 coverages • flux density:7.9 +/- 1 Jy • First Polarization observation at highest frequency up to data

  16. 4.7Ghz (condon et al. 1994) 1.4Ghz (Uraniker et al. 2004) 2.7Ghz (Reich et al. 1981)

  17. G116.5+1.1Size: 80’X60’; Type: S; Dist: 3.6~5.2kpc & CTB1Size: 34’; Type: S; Dist: 2.7kpc • Previous Observations: • Radio: G116.5+1.1 distinct shell, with high polarization. CTB1 incomplete shell, with pulsar to NE • X-rays: ROSAT detected for CTB1 • Our Observations: • 4 coverages • Flux density:G116.5+1.1: 7.4 +/- 1 Jy CTB1: 5.2 +/- 1 Jy • First Total Intensity and Polarization observation at highest frequency up to data for G116.5+1.1

  18. 2.7Ghz (Reich et al. 1981) CTB1 1.4Ghz (Uraniker et al. 2004) ROSAT image of CTB1 (Craig et al. 1997) 4.8Ghz of CTB1 (Angerhofer et al. 1977)

  19. G126.2+1.6 Size: 70’; Type: S?; Spectral Index: varies &G127.1+0.5Size: 45’; Type: S; Dist: 1.2-1.3kpc • Previous Observations: • Radio: G126.2+1.6 poorly defined shell; with weak polarization G127.1+0.5 distinct shell, bright central source be extragalactic active galaxy. • Optical: detected • Our Observation: • 4 coverages • Flux density: G126.2+1.6: 4 +/- 1Jy; G127.1+0.5: 10 +/- 1Jy • First polarization observation for G126.2+1.6 up to data

  20. 2.7Ghz (furst et al. 1983) 4.8Ghz (furst et al. 1984) G127.1+0.5 408Mhz (Joncas et al. 1989) 863Mhz 1.4Ghz

  21. CTA1 (G119.5+10.2)Size: 90’; Type: S; Dist: 3.6~5.2kpc • Previous Observations: • Radio: incomplete shell; typical structure of breakout; compact, central X/gamma-ray source. • Optical: faint diffuse nebulosities. • X-rays: centrally brightened • Our Observation: • 6 coverages • Flux density: 12 +/- 1 Jy • First Total Intensity and Polarization observation at the highest frequency up to data

  22. 2.7Ghz (Sieber et al. 1981) 1.7Ghz (Sieber et al. 1981) 151Mhz (Sieber et al. 1981) 1.4Ghz (image) + ROSAT (contours)

  23. G156.2+5.7 Size: 110’; Type: S; Spectral Index: 0.5 • Previous Observations: • Radio: faint shell • X-Ray: central brightened • Our Observation: • 5 coverages • Flux density: 4 +/- 1 Jy • One of the most weak SNR observed

  24. 1.4Ghz (Reich et al. 1992) 2.7Ghz (Reich et al. 1992) ROSAT image (Pfeffermann et al. 1991)

  25. Cygnus loop (G74.0-8.5) • 5 coverages; • r.m.s: 1.0 mK in I, 0.4 mK in PI; • Flux density: 90 +/- 9 Jy Spectral index: 0.40 • polarization percentage: <= 35% • confirm the variable character of • CL 4 with timescale of ~30days • distorted magnetic field in the • northern part indicating strong • interaction between blast wave • and cloud • the polarization image support • the two-SNR scenario

  26. The future work by combing the maps at other radio bands make the spectral index maps calculate the RM maps polarization and depolarization analysis by combing X-ray observation altogether by statisticing the physics properties of SNRs Better understand the physical process constrain the theoretical models

  27. Thank you!

  28. CTB104A (G93.7+0.2) • coherent polarized structure extends outside SNR to the northwest

  29. G126.2+1.6 & G127.1+0.5 • a new SNR candidate in the east?

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