A deep radio and optical survey near the North Galactic Pole. V - JHK observations of a sample of 5C 12 optical identifications

Details A deep radio and optical survey near the North Galactic Pole. V - JHK observations of a sample of 5C 12 optical identifications A deep radio and optical survey near the North Galactic Pole. V - JHK observations of a sample of 5C 12 optical identifications

Nov 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988mnras.235..465b&link_type=abstract

Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 235, Nov. 15, 1988, p. 465-477.

Astronomy and Astrophysics

Astronomy

9

Astronomical Spectroscopy, Faint Objects, Infrared Photometry, Radio Sources (Astronomy), Sky Surveys (Astronomy), Deep Space, Elliptical Galaxies, Flux Density, Luminosity, Quasars, Red Shift, Spiral Galaxies

Scientific paper

Infrared JHK photometry is reported for 26 candidate optical identifications of faint radio sources (S0.4 GHz > 14 mJy) from the 5C 12 survey. The stellar objects coincident with the radio sources have infrared excesses, typical of QSOs, and most have bvrJHK colours consistent with power laws, Fν ∝ να, -1.5 < α < -0.5. Of the two bluest extended images observed, one has optical/infrared colours consistent with a power law (Fν ∝ να, α ≈ -1), and may be a QSO confused by a close neighbouring image, while the other has colours similar to those predicted for a spiral galaxy. The red extended images have apparent magnitudes and infrared and optical-infrared colours consistent with those expected for non-evolving giant elliptical galaxies at redshifts z < 0.6, and similar to those of 3CR radio galaxies. Redshifts for these red galaxies have been estimated independently on the basis of apparent magnitudes and on the basis of colours. There is good agreement between the two estimates, and a combination of the two techniques may provide an accurate estimate of redshift for low- to medium-redshift radio galaxies.

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