No optical pulses from the Geminga candidate

Details No optical pulses from the Geminga candidate No optical pulses from the Geminga candidate

Jan 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986aj.....91...98k&link_type=abstract

Astronomical Journal (ISSN 0004-6256), vol. 91, Jan. 1986, p. 98-106.

Astronomy and Astrophysics

Astronomy

7

Astronomical Photometry, Gamma Ray Astronomy, Light Curve, Variable Stars, X Ray Sources, Charge Coupled Devices, Galactic Bulge, Neutron Stars, Stellar Magnitude

Scientific paper

The authors have conducted several optical studies of a 21 mag star suggested to be the optical counterpart of the pulsed X-ray source 1E 0630+178 and the γ-ray source 2CG 195+04 (Geminga). They report the absence of significant optical pulsed emission over the entire period range claimed from the analysis of high-energy data. The authors find no significant variability on time scales from tens of minutes to a few months. They suggest that the true optical counterpart of the X-ray source is either one of the two fainter stars in the X-ray source error box or an as yet undetected fainter star. In either case, 1E 0630+178 is a unique X-ray source because its ratio of Lx(0.2 - 2.0 keV)/Lv(3000 - 7000 Å) is at least 1100, which is characteristic of galactic-bulge X-ray sources. However, its absolute magnitude is at least about Mv ≡ 20 and not Mv ≡ 3 mag, typical of the bulge sources.

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