An X-ray and radio study of steep-spectrum radio sources. II - Four fields from a 22 MHz polar CAP survey

Details An X-ray and radio study of steep-spectrum radio sources. II - Four fields from a 22 MHz polar CAP survey An X-ray and radio study of steep-spectrum radio sources. II - Four fields from a 22 MHz polar CAP survey

Aug 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991apjs...76.1055d&link_type=abstract

Astrophysical Journal Supplement Series (ISSN 0067-0049), vol. 76, Aug. 1991, p. 1055-1066.

Astronomy and Astrophysics

Astrophysics

10

Extragalactic Radio Sources, Galactic Clusters, Northern Sky, Radio Spectra, X Ray Sources, Compton Effect, Electron Scattering, Polar Caps, Red Shift, Very Large Array (Vla)

Scientific paper

Four fields containing radio sources with spectral indices greater than unity at low frequencies have been observed over a wide range of radio wavelengths and at X-ray wavelengths. For most of the steep-spectrum sources no optical identifications have been found to the detection limit of the Palomar Schmidt prints, even with the positional precision of about 1 arcsec from VLA maps. This implies that the associated galaxies or clusters lie at a great distance. X-ray emission was not detected from any of the steep-spectrum radio sources. In one case, an extended source appears to be a radio halo in an uncataloged cluster of galaxies at a redshift of 0.125, and it is suggested that this object is a promising candidate for the detection of inverse Compton X-rays, since it is not a high-luminosity source of thermal X-rays.

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