Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 1983
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983mnras.202..397i&link_type=abstract
Monthly Notices of the Royal Astronomical Society, vol. 202, Jan. 1983, p. 397-406.
Astronomy and Astrophysics
Astronomy
11
Astronomical Photometry, Bl Lacertae Objects, Extragalactic Radio Sources, Infrared Astronomy, Infrared Photometry, Elliptical Galaxies, Flux (Rate), Near Infrared Radiation, Radio Galaxies, Spiral Galaxies
Scientific paper
Near-infrared photometry in several apertures has been obtained for eight low redshift extragalactic radio sources. The measurements in the J, H and K bands isolate the central regions of the galaxies identified with these sources, covering a range of -0.17 less than log A/D(0) less than -1.42. Four of these objects are strong extended sources from the 3CR sample, and three are BL Lac objects with compact radio structure. These seven sources are all identified with E or S0 systems. The final object is 3C 305, the only double-lobed 3C radio source to be identified with a spiral galaxy. For the 3C sources, there is no indication of a non-thermal component even through the smallest apertures. However, two of them show central 2.2 micron fluxes in excess of those predicted from the radial flux gradient (curve-of-growth) for normal ellipticals. The BL Lac objects show a range in the relative proportions of non-thermal and galaxian flux, from power law to normal elliptical spectrum. In one object where the non-thermal component is resolved, the annular flux has the colors of a normal elliptical galaxy. There is no evidence in any of these objects that the violent nuclear activity affects the colors of the surrounding galaxy.
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