Near-infrared imaging and the K—z relation for radio galaxies in the 7C Redshift Survey
By C. Willott, S. Rawlings, M. Jarvis, K. Blundell. 2002
171 citations recorded by the source corpus.
We present K-band imaging of all 49 radio galaxies in the 7C-I and 7C-II regions of the 7C Redshift Survey (7CRS). The low-frequency (151-MHz) selected 7CRS sample contains all sources with flux densities S 1 5 1 > 0.5 Jyin three regions of the sky. We combine the K-band magnitudes of the 7CRS radio galaxies with those from the 3CRR, 6CE and 6C* samples to investigate the nature of the relationship between K-magnitude and redshift and whether there is any dependence upon radio luminosity. We find that radio galaxies appear to belong to a homogeneous population that formed the bulk of their stars at high redshifts (z f > 5) and evolved passively from then until they reach a mean present-day luminosity of 3 L * . We find a significant difference between the K-magnitudes of the 7CRS and 3CRR radio galaxies with the 7CRS galaxies being 0.55 mag fainter at all redshifts. The cause of this weak correlation between stellar and radio luminosities probably lies in mutual correlations of these properties with the central black hole mass. We compare the evolution-corrected host luminosities at a constant radio luminosity and find that the typical host luminosity (mass) increases by approximately 1 L * from z ∼ 2 to ∼0.5 which, although a much smaller factor than predicted by semi-analytic models of galaxy formation, is in line with results on optically selected quasars. Our study has therefore revealed that the small dispersion in stellar luminosity of radio galaxies around 3 L * includes subtle but significant differences between the host galaxies of extreme- and moderate-power radio sources at fixed redshift, and between hose of high- and low-redshift radio sources at fixed radio luminosity.
Subfields: Astronomy and Astrophysics
View Paper: https://www.semanticscholar.org/paper/d8b0fa4ab24eda75b7718089a02d1280d8d60871
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In Astronomy and Astrophysics
Citations in the corpus
- The VISTA deep extragalactic observations (VIDEO) survey (2012, background): “Although the central quasar is obscured in these objects, VIDEO will have the sensitivity to detect the host galaxies of such sources up to z ∼ 5 assuming that their host galaxies are ∼2–3 L (e.g. Jarvis et al. 2001; Dunlop et al. 2003; Willott et al. 2003; Herbert et al. 2011).”
- The active nuclei of z < 1.0 3CRR radio sources (2009, methodology): “…of anything better, we adopt the same approach in this paper as we did in H07, and use the Marconi & Hunt (2003) relationship between K-band absolute magnitude and MBH, taking the K-band luminosities of 3CRR objects either from Willott et al. (2003) or from the Two Micron All Sky Survey (2MASS).”
- Evidence for powerful AGN winds at high redshift: dynamics of galactic outflows in radio galaxies during the “Quasar Era” (2008, background): “This is also supported by the observation that powerful radio galaxies are among the most massive galaxies at all redshifts (De Breuck et al. 2001; Willott et al. 2003; Rocca-Volmerange et al. 2004).”
- The Rest-Frame Optical Properties of SCUBA Galaxies (2004, methodology): “Finally, we plot the expected variation with redshift for a nonevolving 3L K galaxy (where M K ¼ 24:3; Kochanek et al. 2001) and the best-fit relation for the powerful radio galaxy sample from Willott et al. (2003).”
- Hot and cold gas accretion and feedback in radio-loud active galaxies (2007, methodology): “1 we plot the observational quantities, radio luminosity andK-band luminosity, for radio galaxies from 3CRR (Laing, Riley & Longair 1983) with available K-band magnitudes, which are taken from the compilation1 of Willott et al. (2003) for sources withz > 0.05 and from 2MASS for nearby objects.”
- EMU: Evolutionary Map of the Universe (2011, background): “Alternatively, high-redshift radio galaxies can be identified from their strong radio emission coupledwith aK-band non-detection (Willott et al. 2003).”
- Early Growth and Efficient Accretion of Massive Black Holes at High Redshift (2003, background): “64+525150.3 based on both Mg ii (Willott et al. 2003a) and C iv line widths (Barth et al. 2003) are in agreement (but note that individual mass estimates based on scaling relationships may be uncertain by a factor 10 (Paper I); the factor 3 uncertainty is valid for statistical samples only). ton…”
- On the evolution of the black‐hole/spheroid mass ratio (2005, methodology): “Consequently, we have based our stellar mass estimates for the 3CRR radio galaxies largely on theK−band photometry compiled by Willott et al. (2003) for their study of theK − z relation (corrected to a fixed 64 kpc metric aperture and for emission-line contamination).”