Possible Detection of a Nearby Supernova Remnant at High Galactic Latitudes

Details Possible Detection of a Nearby Supernova Remnant at High Galactic Latitudes Possible Detection of a Nearby Supernova Remnant at High Galactic Latitudes

Dec 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993aas...183.8310l&link_type=abstract

American Astronomical Society, 183rd AAS Meeting, #83.10; Bulletin of the American Astronomical Society, Vol. 25, p.1422

Astronomy and Astrophysics

Astronomy

Scientific paper

During the Extreme Ultraviolet Explorer (EUVE) sky survey, a region of diffuse background enhancement along the ecliptic scan path of the deep survey Lexan/boron filter is interpreted as due to the presence of a supernova remnant (SNR). Enhancement in the same sky region is also detected by the C and M bands of the ROSAT sky survey. The SNR scenario is supported by the IRAS 100 micron map which shows a depleted cavity of HI, and by the 1.42 GHz radio map which shows a loop of radio enhancement. The ratio of radio brightnesses at two frequencies (viz. 408 MHz and 1.42 GHz) is evaluated at various points along the loop and is shown to be consistent with the power law index of synchrotron radiation from a supernova shell. The center of the SNR is estimated to be at B1950 R.A.=01 03 22.5, Dec=+07 35 37.5, and its radius is about 1.5deg . This could be the first SNR detected at high Galactic latitudes (about +55deg ), and as such is also likely to be the nearest SNR, the age of which is estimated to vary from 800 years at 200 pc to 4,500 years at 500 pc. This work has been supported by NASA contract NAS5-30180.

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