An identification for 'Geminga' (2CG 195+04) 1E 0630+178 - A unique object in the error box of the high-energy gamma-ray source

Details An identification for 'Geminga' (2CG 195+04) 1E 0630+178 - A unique object in the error box of the high-energy gamma-ray source An identification for 'Geminga' (2CG 195+04) 1E 0630+178 - A unique object in the error box of the high-energy gamma-ray source

Sep 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983apj...272l...9b&link_type=abstract

Astrophysical Journal, Part 2 - Letters to the Editor (ISSN 0004-637X), vol. 272, Sept. 1, 1983, p. L9-L13.

Astronomy and Astrophysics

Astronomy

107

Astronomical Spectroscopy, Gamma Rays, Neutron Stars, Optical Emission Spectroscopy, X Ray Astronomy, Cos-B Satellite, Interstellar Extinction, Spaceborne Astronomy

Scientific paper

In the search for counterparts for COS B high-energy gamma-ray sources, 2CG 195+04 was observed with the Einstein Observatory. Four sources have been found, three near to the detection limit and one, 1E 0630+178, at a flux level of approximately 2×10-12 ergs cm-2 s-1. The 3arcsec HRI position has permitted an optical identification with a faint blue object, while VLA data at 6 cm do not show radio flux at the HRI position. The ratio Lx/Lv ≈ 1000, the lack of a radio counterpart, and the absence of temporal variability and of spatial extent in the X-ray data are unique. The very small interstellar absorption suggests a distance of approximately 100 pc (or less). Only a neutron star seems to come close to meeting the data; however, its characteristics would be different from those known so far.

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