On the identification of the high-latitude X-ray source 2A 1219 + 305

Details On the identification of the high-latitude X-ray source 2A 1219 + 305 On the identification of the high-latitude X-ray source 2A 1219 + 305

Apr 1979

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979mnras.187..109w&link_type=abstract

Monthly Notices of the Royal Astronomical Society, vol. 187, Apr. 1979, p. 109-115.

Astronomy and Astrophysics

Astronomy

26

Bl Lacertae Objects, Position Errors, Radiant Flux Density, X Ray Sources, Position (Location), Radio Astronomy, Radio Sources (Astronomy), Sky Surveys (Astronomy), Spectrum Analysis, Visual Observation

Scientific paper

X-ray, radio, and optical observations of the unidentified high-galactic-latitude X-ray source 2A 1219 + 305 are reported. Observations with the Ariel 5 Sky Survey Instrument have been used to reduce the area of the error box to 0.028 sq deg of arc. The flux density of the X-ray source exhibits irregular variations, indicating that the X-rays originate in a region less than 0.1 pc in extent. A deep survey in 1.4-GHz continuum radiation reveals only one radio source inside the contour of 90% positional confidence. This relatively intense (266 mJy) source is probably a double, with each component strongly linearly polarized, but no optical identification is found. A second, weaker (57 mJy) source lies on the edge of the error box, is unresolved, and coincides with a 16-mag blue stellar object. This object exhibits a power-law optical continuum spectrum with a spectral index of 1.90 and no significant emission or absorption features. It appears to be a BL Lac object and may be considered the most likely candidate for identification of the X-ray source.

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