DA 495 - an unusual supernova remnant with resemblances to the Crab nebula

Details DA 495 - an unusual supernova remnant with resemblances to the Crab nebula DA 495 - an unusual supernova remnant with resemblances to the Crab nebula

Dec 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983aj.....88.1810l&link_type=abstract

Astronomical Journal (ISSN 0004-6256), vol. 88, Dec. 1983, p. 1810-1815.

Astronomy and Astrophysics

Astronomy

21

Brightness Distribution, Crab Nebula, Radio Sources (Astronomy), Supernova Remnants, Astronomical Coordinates, Astronomical Maps, Morphology, Planetary Nebulae, Radiant Flux Density, Radio Spectra

Scientific paper

The extended radio source G65.7 + 1.2 (DA 495) lies in the galactic plane, is nonthermal, and is probably a supernova remnant. New observations at 1.4 GHz reveal an unusual morphology: at the outer boundary, which is roughly circular with diameter 30 arcmin, the brightness is low and then rises steadily towards the center but drops slightly within 2 arcmin of the center. The implied volume emissivity is also centrally concentrated overall, but must be very low at the center itself. The appearance is in marked contrast to that of a typical shell remnant whose maximum intensity lies near its outer boundary and it is concluded that DA 495 shows considerable resemblance to the Crab nebula. However, the possibility that DA 495 is an obscured nearby galaxy similar to Maffei 2 cannot be entirely ruled out. A millisecond pulsar, PSR 1953 + 29, lies by chance in the observed field; it was not detected, nor was any extended emission found in its vicinity. The planetary nebula PK 065 + 001 also lies in the field and its radio emission was measured.

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