Astronomy and Astrophysics – Astronomy
Scientific paper
May 1983
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983mnras.203..727l&link_type=abstract
Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 203, May 1983, p. 727-734. NSF-supported research.
Astronomy and Astrophysics
Astronomy
8
Extragalactic Radio Sources, Infrared Astronomy, Quasars, Radio Galaxies, Radio Spectra, Color, Elliptical Galaxies, Infrared Detectors, Magnitude, Near Infrared Radiation, Red Shift
Scientific paper
A sample of step-spectrum radio sources from the Jodrell Bank survey which correspond to empty fields on the POSS has been observed using the Multiple Mirror Telescope (MMR)IR photometer with a 9 arcsec diameter aperture positioned on the radio centroids. This technique has previously been successful with flat-spectrum sources, which are normally relatively compact, but has been thought to be inappropriate for steep-spectrum sources because they are usually extended and the position of the optical/IR counterpart may be too uncertain. Of a sample of 18 'empty field' sources, detections were made at K of 11 which, with four previous detections, gives a success rate of 15 out of the 18 sources and brings the optical/IR detection rate of a complete sample of 87 sources close to 100 per cent. For some detected sources, magnitudes at J and H, have also been determined and it is shown that the IR colors can be used to classify objects. The sample apparently includes galaxies with z approximately equal to 1 and QSOs with very steep optical-IR spectra.
Lebofsky Marcia J.
Rieke George H.
Walsh Dave
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