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J/A+A/436/457 Ultra-steep spectrum radio sources (Gopal-Krishna+, 2005)
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Beginning of ReadMe :J/A+A/436/457 Ultra-steep spectrum radio sources (Gopal-Krishna+, 2005)
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Optical and radio observations of a sample of 52 powerful
ultra-steep spectrum radio sources.
Gopal-Krishna, Ledoux C., Melnick J., Giraud E., Kulkarni V., Altieri B.
<Astron. Astrophys., 436, 457-464 (2005)>
=2005A&A...436..457G
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ADC_Keywords: Galaxies, radio ; Morphology ; Photometry, UBVRI
Keywords: cosmology: observations - galaxies: active - cooling flows -
galaxies: clusters: general - quasars: general -
radio continuum: galaxies
Abstract:
We present the results of radio (VLA) and optical (ESO/La Silla)
imaging of a sample of 52 radio sources having an ultra-steep radio
spectrum with alpha mostly steeper than -1.1 at decimetre
wavelengths (median alpha=-1.22). Radio-optical overlays are
presented to an astrometric accuracy of 1". For 41 of the sources,
radio spectral indices are newly determined using unpublished
observations made with the 100-m Effelsberg radio telescope. For 14 of
the sources identified with relatively brighter optical counterparts,
spectroscopic observations were also carried out at La Silla and their
redshifts are found to lie in the range 0.4 to 2.6.