Astronomy and Astrophysics – Astronomy
Scientific paper
Mar 1976
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976apj...204l.111w&link_type=abstract
Astrophysical Journal, vol. 204, Mar. 15, 1976, pt. 2, p. L111-L114.
Astronomy and Astrophysics
Astronomy
36
Nebulae, Satellite Observation, Supernova Remnants, X Ray Sources, Emission Spectra, Luminous Intensity, Oso-7, Radio Emission, Spaceborne Astronomy, X Ray Spectra
Scientific paper
Results are reported for OSO-7 observations which positively identify the supernova remnant SN 1006 as a weak source of X-ray emission. Acceptable fits to the spectrum are obtained for both a power law with an energy index of about -2.3 and for thermal bremsstrahlung at a temperature corresponding to about 4 keV. The X-ray intensity over the range from 1 to 10 keV is found to be about 9 by 10 to the -11th power erg/sq cm per sec, and it is assumed that the X-rays originate in a plasma shell 4.4 pc in radius and heated by an expanding blast wave. The distance of SN 1006 is estimated as 1.2 kpc, its X-ray luminosity (1-10 keV) as about 1.6 by 10 to the 34th power erg/sec, and its initial kinetic energy as of the order of 10 to the 50th power ergs. It is noted that the reverse-shock model of X-ray production is also consistent with the data and that SN 1006 is the only supernova remnant for which both X-ray and radio emission have been detected, but no optical filaments have been observed.
Laird F. N.
Winkler Frank Jr. P.
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