Astronomy and Astrophysics – Astronomy
Scientific paper
Aug 1977
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977a%26a....60...27h&link_type=abstract
Astronomy and Astrophysics, vol. 60, no. 1, Aug. 1977, p. 27-38.
Astronomy and Astrophysics
Astronomy
34
Extragalactic Radio Sources, Radio Astronomy, Visual Observation, X Ray Sources, Astronomical Maps, Galactic Clusters, Galactic Nuclei, Quasars, Spectrum Analysis, Tables (Data)
Scientific paper
Radio observations at 610 MHz and optical plates were obtained for five fields centered on the unidentified X-ray sources 3U0042 + 32, 3U0917 + 63, 3U1443 + 43, 3U1555 + 27, and 3U1809 + 50. For the first three fields, several radio sources are found which are associated with stellar objects within or near the X-ray error boxes. A 'tailed' radio galaxy has been found in Abell 2142, and this cluster is suggested as the identification for 3U1555 + 27. Although there are no radio sources greater than 0.1 flux unit within the X-ray error boxes associated with 3U1809 + 50, a Zwicky cluster surrounding the 3U position contains two radio galaxies: one with an inverted spectrum and another with a wide-angle tail. A table of positions, intensities, and suggested optical identifications is given for the 249 radio sources detected in the five fields.
Bahcall Neta A.
Harris Daniel E.
Strom Richard G.
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