Astronomy and Astrophysics – Astrophysics
Scientific paper
Jul 1988
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988apj...330..201h&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 330, July 1, 1988, p. 201-217. Research supported by Palomar Observatory.
Astronomy and Astrophysics
Astrophysics
74
Charge Coupled Devices, Gamma Rays, Neutron Stars, Pulsars, Spectral Bands, X Ray Spectroscopy, Black Body Radiation, Optical Emission Spectroscopy, Radio Emission, Synchrotron Radiation
Scientific paper
The authors report the identification of the X-ray source 1E 0630+178, itself a candidate for identification with the high-energy γ-ray source "Geminga", with a blue object inside the Einstein error circle. Deep CCD photometry shows that the star in question has g = 25.14, g - r = -0.32, and is the bluest object in the field by a wide margin. The Einstein X-ray spectral data are also analyzed. Contrary to previous claims, no upper limit to the distance can be derived from the X-ray spectrum. The new results support previous models in which Geminga was predicted to be a Vela-type pulsar, since placing Geminga at a distance of 500 - 1000 pc would mean that the absolute luminosities in each of the optical, X-ray and γ-ray bands would be nearly the same as those of Vela.
Halpern Jules P.
Tytler David
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