Hubble Space Telescope Near Infrared Snapshot Survey of 3CR radio source counterparts III: Radio galaxies and quasars in context
David J. E. Floyd, David Axon, Stefi Baum, Alessandro Capetti, Marco, Chiaberge, Juan Madrid, Christopher P. O'Dea, Eric Perlman, William Sparks

TL;DR
This study compares the near-infrared properties of low-redshift 3CR radio galaxy hosts with other galaxy types, revealing similarities and differences that inform the understanding of active galactic nuclei and their host galaxies.
Contribution
It provides a detailed comparison of 3CR radio galaxy hosts with quasars and other galaxy types, highlighting differences in host galaxy luminosity and mass that impact AGN unification models.
Findings
Most 3CR FR II hosts are massive ellipticals similar to quasar hosts.
Approximately 20% of FR II hosts are under-luminous and often red or in groups.
RLQs require more massive hosts than radio galaxies and RQQs.
Abstract
We compare the near-infrared (NIR) H band photometric and morphological properties of low-redshift (z<0.3) 3CR radio galaxies with samples of BL Lac object 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 (~L*) elliptical galaxies. The vast majority of FR II's (~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 (~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…
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