1. The Onion-like Metallicity Structure of Tycho’s SNR as revealed by Doppler Broadened Lines
Asami Hayato
(RIKEN / Tokyo Univ. of Sci.)
T. Tamagawa, H. Yamaguchi (RIKEN),
A. Furuzawa, H. Kunieda (Nagoya Univ.),
M. Ozawa (Kyoto Univ.), J. P. Hughes (Rutgers Univ.),
U. Hwang (NASA/GSFC), A. Bamba (ISAS/JAXA),
K. Makishima (Univ. of Tokyo/RIKEN), and Suzaku Tycho’s SNR team

2. Tycho’s SNR Ideal prototype of Type Ia SNRs
◇ Originated in the SN in 1572
◇ Observed by Tycho Brahe
◇ Categorized as Type Ia
◇ Distance = ~3 kpc
◇ Diameter = ~8 arcmin
Ideal prototype of
Type Ia SNRs

3. Past Observations ◇ Image Analysis ◇ Spectral Analysis Fe Ka Si, S
ASCA　(Hwang & Gotthelf 97)
ASCA (Hwang+98)
Fe Ka
Low Temp (0.86 keV)
High Ionization Age
(1011cm-3 s)
Si, S
High Temp (1.6 keV)
Low Ionization Age
(109cm-3 s)
Fe L, Si, Fe Ka
Fe Ka Si
Fe K
XMM-Newton　(Decucell+01) Si
Fe K

4. Suzaku Observation ◇ Onion-like Structure ⇒ This talk
Date: June 27-29, 2006 (SWG time)
Exposure: 95 ks
◇ XIS Image
◇ Spectrum of Entire SNR
◇ Non-thermal emission ⇒ Tamagawa+09
◇ Low abund. metals (Cr, Mn)
⇒ Poster XIII-30 (Tamagawa+),
Tamagawa+09
◇ Onion-like Structure ⇒ This talk
XIS
HXD
Si (He-like) Ka, Fe Ka, >7keV

5. Fe Kα Line Broadening 6
7 (keV)
Furuzawa+09

6. Spatially Resolved Spectra
Si He-like Kβ
S He-like Kα
Ar He-like Kα
Ca He-like Kα
Fe Kα Blend 1 2 3 4

7. Radial Line Profiles Si S Ar Ca Fe Line Center (keV) 1σ Width (eV)2 3 4 Si
17eV
13eV
16eV
41eV
42eV
12eV
5eV
2eV
6eV
27eV S Ar Ca
Gain variation
across the SNR is
within ± %
(Ota+07) Fe
Radius (arcmin)

8. Why are lines broadened?
◇ Plasma in multi-nt
(ionization age) ?
Observer
High nt
Low nt
◇ Doppler effects by
shell expansion ? E E
Fe Kα
Si Kα
High nt
Low nt
Non-equilibrium ionization
collisional plasma model
Red Shifting
Blue Shifting E E
Line Center
radius
~30 eV (Si, S)
~100 eV (Fe)
Line Width
radius
Line Center
radius
Line Width
radius
Observation

9. Analysis with Shell Expansion Model= v c Si S Ar Fe

10. (ASCA: Hwang & Gotthelf 97)
Velocities of Ejecta Fe Si S
Velocity
of each element,
Independent
of the distance. Si S
Velocity in km/s (This work) Ar
Iwamoto+99 Fe
Si, S Fe
Radial peak in arcmin
(ASCA: Hwang & Gotthelf 97)

11. Summary ◇ Suzaku observed Tycho’s SNR in June 2006.
◇ Line broadening was detected at the center of the SNR.
◇ We successfully derived velocities of ejecta for the first time, assuming the shell expansion model.
◇ Si and S ejecta have higher velocities
(~3500 km s-1) than Fe ejecta (~3000 km s-1).
◇ We are looking forward to see the data from SXS/Astro-H !