Observations at 408 MHz of the supernova remnant HB 3 (G132.6 + 1.5)

Details Observations at 408 MHz of the supernova remnant HB 3 (G132.6 + 1.5) Observations at 408 MHz of the supernova remnant HB 3 (G132.6 + 1.5)

Jul 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987aj.....94..111l&link_type=abstract

Astronomical Journal (ISSN 0004-6256), vol. 94, July 1987, p. 111-122. NSERC-supported research.

Astronomy and Astrophysics

Astronomy

22

Radio Sources (Astronomy), Stellar Spectrophotometry, Supernova Remnants, Angular Resolution, Astronomical Maps, Emission Spectra, Radiant Flux Density, Visible Spectrum, X Ray Spectra

Scientific paper

Observations are presented of the supernova remnant HB 3 (Gl32.6 + 1.5) made at 408 MHz with an angular resolution of 3.5 × 4.0 arcmin. The flux density at 408 MHz is 75 ± 15 Jy, and the spectral index is 0.60 ± 0.04. The observations show the full extent of the SNR, now seen to be 90 × 123 arcmin (EW × NS). The 408 MHz map is compared with x-ray, optical, and CO data. The SNR is a shell remnant with a distorted outline, which suggests that it is in a late stage of its evolution where its development is influenced by the irregularities of the interstellar medium. There is no strong evidence of interaction with the adjacent H II region W3. However, the SNR appears to be immediately behind a CO cloud, and may possibly be interacting with it. It is most likely that this CO cloud is part of the Cas OB6 complex, which includes W3. A distance of 2.7 ± 0.3 kpc can therefore be assigned to HB 3, making its physical size 71 × 97 pc. The 408 MHz observations also include the H II region W4 (IC 1805). Properties of small-diameter sources at 408 and 1420 MHz are tabulated. There is no evidence of any shell of emission around the Crab-like SNR 3C 58 brighter than 8.6 × 10-22 W m-2 Hz-1 sr-1 at 408 MHz.

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