Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006aas...20924303l&link_type=abstract
2007 AAS/AAPT Joint Meeting, American Astronomical Society Meeting 209, #243.03; Bulletin of the American Astronomical Society,
Astronomy and Astrophysics
Astronomy
Scientific paper
We present Hα spectral observations of a Balmer-dominated shock on the eastern side of Tycho’s supernova remnant using 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 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 incline in the Hα intensity and line width ahead of the shock. We propose that this region ( 10^16 cm) is likely to be the precursor resolved. The line width increases from 30 km/s 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 a possibility of a fast neutral precursor is not ruled out.
Ghavamian Parviz
Hayashi Masahito
Koo B.
Lee Jae-Joon
Pyo T.
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