X-ray observations of supernova remnants as distance indicators

Details X-ray observations of supernova remnants as distance indicators X-ray observations of supernova remnants as distance indicators

Jun 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994apj...427l..95k&link_type=abstract

Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X), vol. 427, no. 2, p. L95-L97

Astronomy and Astrophysics

Astronomy

7

Distance, Kinetic Energy, Supernova Remnants, X Ray Astronomy, X Ray Spectra, Astronomical Catalogs, Astronomical Models, Correlation, Propagation Velocity, Proportional Counters, Rosat Mission, Shock Wave Propagation, Sky Surveys (Astronomy)

Scientific paper

We investigate whether ROSAT observations of thermal X-ray emission from shell-type supernova remnants (SNRs) can be used to constrain their distances. The most critical assumption is that the initial kinetic energy (epsilon0) of a supernova (SN) explosion is a constant at epsilon0 = 1051 ergs; however, the derived distance (D) is only weakly dependent on epsilon0 (D varies as ((epsilon0))0.4)). We evaluate this technique by applying it to SNRs with independently determined distances, and our initial results indicate good agreement. We conclude that the ROSAT all-sky survey may be used to establish, for the first time, a set of good distance estimates to a large number of extended, shell-type SNRs. The energy range of ROSAT is well suited for this purpose, since most shell-type SNRs have thermal X-ray spectra which peak within the ROSAT PSPC (position-sensitive proportional counter) energy range of 0.1-2.4 keV.

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