Astronomy and Astrophysics – Astronomy
Scientific paper
Mar 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991aj....101.1033l&link_type=abstract
Astronomical Journal (ISSN 0004-6256), vol. 101, March 1991, p. 1033-1042, 1116, 1117. NSERC-supported research.
Astronomy and Astrophysics
Astronomy
23
H I Regions, Interstellar Matter, Radio Sources (Astronomy), Supernova Remnants, Astronomical Maps, Continuous Radiation, H Alpha Line, Signal To Noise Ratios, Ultrahigh Frequencies
Scientific paper
High-resolution radio observations of the large-angular-diameter SNR HB9 are reported. Data obtained in the 408- and 1420-MHz continuum and in H I using the four 9-m paraboloid antennas of the Dominion Radio Astrophysical Observatory synthesis telescope during 1986-1989 are presented in graphs and grey-scale and contour maps and discussed in detail. It is shown that the emission is dominated by filamentary arcs extending across the SNR, often at locations where filaments are seen in H-alpha but at times displaced inward from the optical filaments. The mean spectral index derived from these observations is alpha = 0.61, with rms deviation 0.08 on scale sizes equal to about 15 percent of the SNR diameter. The distance of the SNR is estimated as 4 kpc or less, and it is suggested that HB9 may be associated with PSR 0458 + 46, at about 1.2 kpc. The H I observations show no evidence of interaction between the SNR and the atomic component of the surrounding gas.
Leahy Denis A.
Roger Robert S.
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