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HUBBLE SPACE TELESCOPE NEAR-INFRARED SNAPSHOT SURVEY OF 3CR RADIO SOURCE COUNTERPARTS. III. RADIO GALAXIES AND QUASARS IN CONTEXT
journal contribution
posted on 2023-06-08, 04:52 authored by David J E Floyd, David Axon, Stefi Baum, Alessandro Capetti, Marco Chiaberge, Juan Madrid, Christopher P O'Dea, Eric Perlman, William SparksWe compare the near-infrared (NIR) H-band photometric and morphological properties of low-z (z < 0.3) 3CR radio galaxies with samples of BL Lac objects and quasar host galaxies, merger remnants, quiescent elliptical galaxies, and brightest cluster galaxies drawn from the literature. In general, the 3CR host galaxies are consistent with luminous (similar to L*) elliptical galaxies. The vast majority of FR II's (similar to 80%) occupy the most massive ellipticals and form a homogeneous population that is comparable to the population of radio-loud quasar (RLQ) host galaxies in the literature. However, a significant minority (similar to 20%) of the 3CR FR II's appears under-luminous with respect to quasar host galaxies. All FR II objects in this faint tail are either unusually red, or appear to be the brightest objects within a group. We discuss the apparent differences between the radio galaxy and RLQ host galaxy populations. RLQs appear to require greater than or similar to 10(11) M-circle dot host galaxies (and similar to 10(9) M-circle dot black holes), whereas radio galaxies and radio-quiet quasars can exist in galaxies down to similar to 3 x 10(10) M-circle dot. This may be due to biases in the measured quasar host galaxy luminosities or populations studied, or due to a genuine difference in host galaxy. If due to a genuine difference, it would support the idea that radio and optical active galactic nuclei are two separate populations with a significant overlap.
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Publication status
- Published
Journal
Astrophysical JournalISSN
0004-637XPublisher
Institute of PhysicsExternal DOI
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1Volume
713Page range
66-81Department affiliated with
- Physics and Astronomy Publications
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- No
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- Yes
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2012-02-06Usage metrics
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