Astronomy and Astrophysics – Astrophysics
Scientific paper
2007-04-09
Astrophys.J.Lett.659:L133-L136,2007
Astronomy and Astrophysics
Astrophysics
4 pages, 3 figures, The paper will be published in the April 20, 2007 issue of the Astrophysical Journal, 659, L133
Scientific paper
10.1086/517520
We present an Ha spectral observation of a Balmer-dominated shock on the eastern side of Tycho's supernova remnant using the Subaru Telescope. Utilizing the High Dispersion Spectrograph (HDS), we measure the spatial variation of the line profile between preshock and postshock gas. Our observation clearly shows a broadening and centroid shift of the narrow-component postshock Ha line relative to the Ha emission from the preshock gas. The observation supports the existence of a thin precursor where gas is heated and accelerated ahead of the shock. Furthermore, the spatial profile of the emission ahead of the Balmer filament shows a gradual gradient in the Ha intensity and line width ahead of the shock. We propose that this region (~10^16 cm) is likely to be the spatially resolved precursor. The line width increases from ~30 up to ~45 km/s, and its central velocity shows a redshift of ~5 km/s across the shock front. The characteristics of the precursor are consistent with a cosmic-ray precursor, although the possibility of a fast neutral precursor is not ruled out.
Ghavamian Parviz
Hayashi Masahiko
jitsu Akito Ta
Koo Bon-Chul
Lee Jae-Joon
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