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A Multiwavelength Study of SNR 3C396. Yang Su Purple Mountain Observatory yangsu@pmo.ac.cn Yang Chen (NJU) Ji Yang (PMO) Bon-Chul Koo (SRAO) Xin Zhou (NJU). 3C396 (G39.2-0.3): HI D~6.5-9.6 kpc (Caswell et al. 1975) Spectral index~-0.49 (Anderson et al. 1993)
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A Multiwavelength Study of SNR 3C396 Yang Su Purple Mountain Observatory yangsu@pmo.ac.cn Yang Chen (NJU) Ji Yang (PMO) Bon-Chul Koo (SRAO) Xin Zhou (NJU)
3C396 (G39.2-0.3): HID~6.5-9.6 kpc (Caswell et al. 1975) Spectral index~-0.49 (Anderson et al. 1993) ASCA X-ray (Harrus et al. 1999):
VLA 1465MHz (Patnaik et al. 1990): Blow-out structure
Left: Radio Grey & X-ray Contour; • Right: Chandra X-ray (Olbert et al. 2003) PWN: Index~1.5
Red: H2 2.12um • Blue: [Fe II] 1.64um • Contour: Radio Lee et al. 2008 MS wind RSG wind The H2 shell is outside of the [Fe II] shell.
Hewitt et al. (2009): 1, Multi-phase pre-shock ISM (atomic, molecular and dense gas); 2, C shock +C shock or C shock + J shock
0.5-8.0 keV Si~1.65-2.1 keV S~2.25-2.6 keV 3.0-7.0 keV
R: Si (1.65-2.1keV) G: S (2.25-2.6 keV) B: continuum (3.0-7.0 keV) north Shell PWN SW Z>1 south Z~1
Vnei for thermal X-ray gas • Power-law for non-thermal PWN emission
The northeastern shell-like structure: 2’*3’ region Thick: 12CO(1-0) The wing Thin: 13CO(1-0)*5 The main-body of MC 12CO(1-0): V~69.5 km/s FWHM~3.1 km/s 13CO(1-0): V~69.3 km/s FWHM~2.1 km/s
12CO-13CO*5 The subtracted image display the partial-shell structure. For the blue-shift of the 69 km/s
Cavity-like structure Broad wing: 12CO: 65-68 km/s • Red: CO • Green: IR • Blue: X-ray Main body: 13CO: 68-72 km/s Left Contour: Radio Right Contour: IR
69 km/s 85 km/s
69 km/s 85 km/s
3C396 (G39.2-0.3) R0=8kpc, v0=220km/s Position A B Velocity (km/s) 69 85 Distance (kpc) 8.1 6.2 CO data 69 km/s 85 km/s 8.1 kpc 6.2 kpc So, the SNR is likely near the tangent point or the far-side of the Sagittarius arm X-ray Spectral Fitting: N(H)~4.6e22(cm-2), n~2cm-3, D~7.4 kpc
HI self-absorption? Near point? Thick: 13CO(1-0)*100 & Thin: HI 69 km/s 85 km/s
R: 13CO 83-86 km/s G: 24um IR B: X-ray Peak of X-ray, IR & radio: Interaction between SNR shock and MC
L~1.0’~1.8 pc @6.2kpc D~0.2’~0.4 pc @6.2kpc e.g. Kes 75 e.g. Crab
N(H)~3.1E21 cm-2 (16.3 arcmin at 6.2 kpc) • The Mass of the wind bubble: 3.6E3 Msun • n(R~3’~5.4pc)~450 cm-3 • r2(bubble)~8.0 pcRc~0.86*r2~6.8 pc • v2(bubble)~4.7 km/s • 1’@6.2kpc~1.8 pc Rc>Radius of SNR
For the SW region: • X-ray: n~2.7 cm-3 P~8E-9 dynes cm-2 Vs~0.66 keV~740 km/s t~0.4R/Vs~3000 yr • IR: n~1E6 cm-2 or 1E4 cm-2 P~1E-6 dynes cm-2 or 1E-7 dynes cm-2 Chevalier (1999): Pressure enhancements of 10-100 times can occur when the SNR shell interacts with dense clumps.
M(hot gas)~20-30 Msun; • M(MC)~ 4E3 Msun in half ball; Jet ? 500 counts Z>1 MC Peak of X-ray, IR & radio: Interaction between SNR shock and MC Blow-out Z~1 Z>1