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Title:
Subaru HDS Observations of a Balmer-dominated Shock in Tycho's Supernova Remnant
Authors:
Lee, Jae-Joon; Koo, Bon-Chul; Raymond, John; Ghavamian, Parviz; Pyo, Tae-Soo; Tajitsu, Akito; Hayashi, Masahiko
Affiliation:
AA(Astronomy Program, Department of Physics and Astronomy, Seoul National University, Seoul 151-742, Korea; .), AB(Astronomy Program, Department of Physics and Astronomy, Seoul National University, Seoul 151-742, Korea), AC(Harvard-Smithsonian Center for Astrophysics, Cambridge, MA 02138.), AD(Department of Physics and Astronomy, Johns Hopkins University, Baltimore, MD 21218.), AE(Subaru Telescope, National Astronomical Observatory of Japan, Hilo, HI 96720.), AF(Subaru Telescope, National Astronomical Observatory of Japan, Hilo, HI 96720.), AG(Subaru Telescope, National Astronomical Observatory of Japan, Hilo, HI 96720.)
Publication:
The Astrophysical Journal, Volume 659, Issue 2, pp. L133-L136. (ApJL Homepage)
Publication Date:
04/2007
Origin:
UCP
ApJ Keywords:
ISM: Individual: Alphanumeric: G120.1+1.4, ISM: individual (Tycho), Line: Profiles, Shock Waves, ISM: Supernova Remnants
DOI:
10.1086/517520
Bibliographic Code:
2007ApJ...659L.133L

Abstract

We present an Hα 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 Hα line relative to the Hα 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 Hα intensity and line width ahead of the shock. We propose that this region (~1016 cm) is likely to be the spatially resolved precursor. The line width increases from ~30 up to ~45 km s-1, and its central velocity shows a redshift of ~5 km s-1 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.

Based on data collected at Subaru Telescope, which is operated by the National Astronomical Observatory of Japan.

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