The nonthermal radio sources at L = 74.9 and B = +1.2 deg

Details The nonthermal radio sources at L = 74.9 and B = +1.2 deg The nonthermal radio sources at L = 74.9 and B = +1.2 deg

Feb 1975

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975a%26a....38..461d&link_type=abstract

Astronomy and Astrophysics, vol. 38, no. 3, Feb. 1975, p. 461-465.

Astronomy and Astrophysics

Astronomy

28

Nonthermal Radiation, Radio Sources (Astronomy), Spectrum Analysis, Stellar Spectra, Supernova Remnants, Astronomical Maps, Galactic Radiation, Point Sources, Polarization Characteristics, Radio Spectra

Scientific paper

Radio observations over a large frequency range and high-resolution mapping at 1415 MHz of the source G74.9 + 1.2 show an extended nonthermal source; some 7 arcmin west a point source is found, which seems to be extragalactic. The point source is weakly polarized and has a flat spectrum which shows a turnover at 7500 MHz. At high frequencies no variability is detected over a period of 26 months. The extended component is identified as a supernova remnant. Its spectrum and polarization are quite normal for a supernova remnant, but a definite shell structure is not apparent from the map presented.

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