A 3\times10$^9$ M$_solar$ Black Hole in the Quasar SDSS J1148+5251 at z=6.41
\apjl 587 (2003) L15-L18-L15-L18
Near-infrared imaging and the K-z relation for radio galaxies in the 7C Redshift Survey
Monthly Notices of the Royal Astronomical Society 339:1 (2003) 173-188
Galaxies in southern bright star fields. I. Near-infrared imaging
Astronomy and Astrophysics 406:2 (2003) 593-601
Abstract:
As a prerequisite for cosmological studies using adaptive optics techniques, we have begun to identify and characterize faint sources in the vicinity of bright stars at high Galactic latitudes. The initial phase of this work has been a program of Ks imaging conducted with SOFI at the ESO NTT. From observations of 42 southern fields evenly divided between the spring and autumn skies, we have identified 391 additional stars and 1589 galaxies lying at separations Δθ ≤ 60″ from candidate guide stars in the magnitude range 9.0 ≤ R ≤ 12.4. When analyzed as a "discrete deep field" with 131 arcmin2 area, our dataset gives galaxy number counts that agree with those derived previously over the range 16 ≤ Ks < 20.5. This consistency indicates that in the aggregate, our fields should be suitable for future statistical studies. We provide our source catalogue as a resource for users of large telescopes in the southern hemisphere.Radio galaxy host properties spanning three dex in radio luminosity
New Astronomy Reviews 47:4-5 (2003) 187-191
Abstract:
We describe a major study of radio source host galaxies being carried out with the HST and ground-based facilities. Our sample is selected from 4 complete samples with different radio flux-density limits, giving a range of three orders of magnitude in radio luminosity at a fixed epoch (z=0.5). High-resolution HST WFPC2 imaging shows that all 44 radio galaxies have flux distributions well fit by an r1/4 law and lying on the Kormendy relation defined by lower redshift ellipticals with a shift in the zero-point to account for passive evolution. Spectroscopic follow-up enables stellar velocity dispersions to be determined and black hole masses estimated. The clustering environments of the radio galaxies are being probed via multi-colour wide-field imaging. Together, these data allow a detailed investigation of how factors such as clustering environment, close interactions and star-formation history affect the accretion rate, ionizing luminosity and jet production from supermassive black holes. © 2003 Elsevier B.V. All rights reserved.The host galaxies of flat-spectrum quasars
New Astronomy Reviews 47:4-5 (2003) 183-186