A search for hydrogen radio recombination lines from a fossil H II region toward the SNR CAS A

Details A search for hydrogen radio recombination lines from a fossil H II region toward the SNR CAS A A search for hydrogen radio recombination lines from a fossil H II region toward the SNR CAS A

Apr 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993astl...19..135s&link_type=abstract

Astronomy Letters, Vol. 19, p. 135-138; Pis'ma v Astronomicheskij Zhurnal (ISSN 0320-0108), vol. 19, no. 4, p. 359-365. In Russ

Astronomy and Astrophysics

Astronomy

H Alpha Line, Hydrogen Recombinations, Radio Spectra, Supernova Remnants, H Ii Regions, Interstellar Matter

Scientific paper

A highly sensitive search for the radio recombination lines H165 alpha and H166 alpha, which can be formed in an H II shell around an SNR, was conducted towards Cas A. An upper limit of 5 x 10 exp -5 is determined for the line optical depth. It can be accounted for if: (1) the H II shell around Cas A has a higher temperature than that of normal H II regions, and (2) the observed LF cutoff of the Cas A spectrum is not fully due to the interstellar medium.

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