Astronomy and Astrophysics – Astronomy
Scientific paper
Oct 1976
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976apj...209l..17b&link_type=abstract
Astrophysical Journal, vol. 209, Oct. 1, 1976, pt. 2, p. L17-L20.
Astronomy and Astrophysics
Astronomy
12
Galactic Clusters, Optical Measurement, Radio Observation, X Ray Sources, Error Analysis, Galactic Radio Waves, Luminous Intensity, Radiant Flux Density, Radio Astronomy, Uhuru Satellite
Scientific paper
Radio observations at 610 MHz are combined with optical data to search for radio-optical candidates for five high-latitude Uhuru X-ray sources (3U 0042+32, 0917+63, 1443+43, 1555+27, and 1809+50). From the data for two of these fields, it is suggested that: (1) the rich cluster of galaxies A2142, which is found to contain several extended radio sources in its central region, is a likely candidate for 3U 1555+27, as first suggested from purely optical observations; (2) the 'near' Zwicky cluster, Zw 1810.2+4949, which contains a complex radio source associated with a 15-mag galaxy, is a candidate identification for 3U 1809+50. The unusual radio galaxy OU 516, as well as the double galaxy NGC 6582, both located in the cluster, are also candidates for 3U 1809+50, especially if the X-rays indicate variability.
Bahcall Neta A.
Harris Daniel E.
Strom Richard G.
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