A Multiwavelength Study of SNR 3C396

Yang SuPurple Mountain Observatory

yangsu@pmo.ac.cnYang 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

The H2 shell is outside of the [Fe II] shell.

MS wind

RSG wind

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)

Z~1

PWN

Z>1

north

SW

south

Shell

Whole-PWN 35525 counts (NH~4.6E22cm-2,kT~1keV, Si,S~1&Ca>1)

PWN 2733 counts (NH~4.7E22cm-2, kT~0.68keV)

PWNOUT 4693 counts (NH~4.3E22cm-2,

kT~1.9keV,Si,S,Ca~1)

North 6010 counts (NH~4.9E22cm-2,

kT~1.3keV,Si,S,Ca>1)

South 3368 counts (NH~4.8E22cm-2,

kT~1.0keV,Si,S,Ca>1)

East 2380 counts (NH~4.6E22cm-2, kT~0.73keV,S>1)

SW 2493 counts (NH~4.4E22cm-2, kT~0.66keV, Si,S~1)

W-Shell 1530 counts (NH~5.8E22cm-2,kT~0.64keV, Si~1&S>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

For the red-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

Lee et al. (2008): 13CO Contour & Near-IR Grey

For the tangent point (v~85

km/s)

69 km/s

85 km/s

69 km/s

85 km/s

3C396 (G39.2-0.3) R0=8kpc, v0=220km/sPosition A BVelocity (km/s) 69 85Distance (kpc) 8.1 6.2

CO data 69 km/s 85 km/s 8.1 kpc 6.2 kpc So, the SNR is likely n

ear 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-3P~8E-9 dynes cm-2Vs~0.66 keV~740 km/st~0.4R/Vs~3000 yr

• IR:n~1E6 cm-2 or 1E4 cm-2P~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;

Z>1

Z>1

Z~1

Jet ? 500 counts

MC Peak of X-ray, IR & radio:

Interaction between SNR shock and MC

Blow-out

THANKS