arXiv:1108.0265

arXiv:1108.0265

Fermi-LAT Detection of the Young SNR Tycho

ZhangXiao2011.09.19

Fermi TS map

green: XMM-Newtonblack:95% confidence area for the Fermi positin

VERITAS counts mapblack : chandramagenta: CO(J=1-0) Heyer 1998 FCRAO

TeV44 2kpcmax, DEp

512/3

kpc2/1

Hamb

51 24.0 EDnE

3251

7kpcH cm388 EDn

far scenario

kpc2.2d

5~3kpc4.2d

6.4~3.4kpc9.2d

2222 61

51

41

31 :::

4 : 2.25 : 1.44 : 1

◆ speculation:

following the conclusion of Lee & Koo , the gamma-ray flux should significantly increase due to increasing of ambient density,while the X-ray flux not ?how long ?can we model it?

◆ doubts:

◆ Lee & Koo ( ApJ 2004 )

the shock is propagating into the low-density outskirts of the molecular cloud.

◆ Reynoso,et al.1997

arXiv:1106.0184

Detection of the PWN HESS J1825-137 with Fermi-LAT

counts map

TS map

problems

1. the structure of MC maybe affect the spectral index

2. escaped particles penetrate the shock

SNRMC

difd 4)( tDER

EDD 10

pc13.2 3/13/1MC

nMR

ISM or CSM

EDD 10

)exp(),,( 2dif

2

3dif

2/30

R

R

R

ENtREf

difdif 4)( tDER

impulsive source

p

pppppinel

d),()()(

d

dp E

EEFEJEcn

E

NE E

E

b

rnnb 0

)(d ERr ? RERr )(dor

arXiv: 1109.3017

Fermi-LAT Observations of the SNR G8.7-0.1

Radio map of the W30 region

blue :VLA 90cmred : infraredgreen:SGPS+ VLA 20cm

LAT 2-10 GeV counts map

blue plus : PSR J1803-2137 (3.88 kpc)magenta : PSR J1806-2125 (9.85 kpc)red plus : PWN candidateblack cross:Position of W

a : VLA 90cmb : CO(J=1-0)SNR G8.31-0.09

G8.7-0.1:

18 05 30,-21 26 45

size: 45 arcmin

age : 15-28 kyr

dist : 3.2-6 kpc

18:06:00.0

o 0'.3821,6.0518 mh

'2.2237.0 or

)(Ettdif

/1

max

)()( E

EtE Sedov

threEEt 0)(

Thanks !