Radio observations of the bright X-ray supernova remnant G156.2+5.7

Details Radio observations of the bright X-ray supernova remnant G156.2+5.7 Radio observations of the bright X-ray supernova remnant G156.2+5.7

Mar 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992a%26a...256..214r&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 256, no. 1, p. 214-224.

Astronomy and Astrophysics

Astronomy

35

Interstellar Magnetic Fields, Radio Astronomy, Supernova Remnants, X Ray Astronomy, Carbon Monoxide, Continuous Spectra, H Lines, Radio Observation

Scientific paper

Radio continuum emission has been observed from the bright X-ray SNR RX04591+5147 (= G156.2+5.7), which has been recently detected with the ROSAT Observatory. The Effelsberg 100-m telescope has been used to map this object at 1448 MHz and 2695 MHz. Radio emission from a highly polarized nonthermal shell with a diameter of 1.9 deg and a spectral index of 0.50 +/- 0.15 (S is approximately equal to nu exp -alpha) has been found. G156.2+5.7 has a surface brightness at 1 GHz of 5.8 x 10 exp -23 W/sq m Hz sr, which is the lowest among all known SNRs. An area of 6 x 5 deg centered on this object has been observed in the HI line. The determination of the kinematical distance of G156.2+5.7 based on the HI line data turns out to be problematic. The most likely distance is between 3 and 1 kpc. Thus, the diameter of the radio continuum shell is between 100 and 33 pc. A weak HI shell may be associated with the SNR. At 3 (1) kpc distance its diameter is about 140 (47) pc and the mass is about 6300 (700) solar masses. This shell may have been created by the action of the stellar wind of a massive progenitor leaving a low density cavity, which is inferred from the X-ray observations.

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