Astronomy and Astrophysics – Astronomy
Scientific paper
Apr 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010apj...712..901r&link_type=abstract
The Astrophysical Journal, Volume 712, Issue 2, pp. 901-907 (2010).
Astronomy and Astrophysics
Astronomy
5
Ism: Lines And Bands, Ism: Supernova Remnants, Line: Profiles, Shock Waves
Scientific paper
The broad components of the Hα lines in most non-radiative shocks can be fit with single-Gaussian components. We have obtained a high-quality spectrum of a position in Tycho's supernova remnant with the MMT and Blue Channel Spectrograph which shows, for the first time, that a single Gaussian does not provide an acceptable fit. This implies that a single temperature Maxwellian particle velocity distribution cannot produce the emission. Possible alternative explanations are explored, including multiple shocks along the line of sight, a pickup ion contribution, a non-thermal tail (Kappa distribution), emission from a precursor in a cosmic ray modified shock, or turbulence. An Hubble Space Telescope image shows a bright knot that might account for a low temperature contribution, and all the possibilities probably contribute at some level. We discuss the implications of each explanation for the shock parameters and physics of collisionless shocks, but cannot conclusively rule out any of them.
Blair William Patrick
Lee Jae-Joon
Park Sangwook
Raymond John C.
Winkler Frank P.
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