Asami Hayato (RIKEN / Tokyo Univ. of Sci.)

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Presentation transcript:

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

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

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

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

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

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

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 ±0.2-0.5% (Ota+07) Fe 1 2 3 4 1 2 3 4 Radius (arcmin)

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

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

(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)

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 !