Ultra-steep spectrum radio sources (Gopal-Krishna+, 2005)

Details Ultra-steep spectrum radio sources (Gopal-Krishna+, 2005) Ultra-steep spectrum radio sources (Gopal-Krishna+, 2005)

Sep 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006ycat..34360457g&link_type=abstract

VizieR On-line Data Catalog: J/A+A/436/457. Originally published in: 2005A&A...436..457G

Astronomy and Astrophysics

Astronomy

Galaxies: Radio, Morphology, Photometry: Ubvri

Scientific paper

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 For 41 of the sources, radio spectral indices are newly determined using unpublished observations made with the 100-m Effelsberg radio telescope.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.
(2 data files).

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