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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 Sparks
We 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.

History

Publication status

  • Published

Journal

Astrophysical Journal

ISSN

0004-637X

Publisher

Institute of Physics

Issue

1

Volume

713

Page range

66-81

Department affiliated with

  • Physics and Astronomy Publications

Full text available

  • No

Peer reviewed?

  • Yes

Legacy Posted Date

2012-02-06

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