ar X iv : a st ro - p h / 01 11 17 1 v 1 8 N ov 2 00 1 Near - infrared micro - variability of radio - loud quasars . Matthew Whiting 1 Alicia Oshlack

Near-infrared micro-variability of radio-loud quasars

We observed three AGN from the Parkes Half-Jansky Flat-spectrum Sample at nearinfrared (NIR) wavelengths to search for micro-variability. In one source, the blue quasar PKS 2243−123, good evidence for NIR micro-variability was found. In the other two sources, PKS 2240−260 and PKS 2233−148, both BL Lacertae objects, no such evidence of variability was detected. We discuss the implications of the...

ar X iv : a st ro - p h / 01 05 21 3 v 2 1 6 M ay 2 00 1 A Very Radio - Loud Narrow - Line Seyfert 1 : PKS 2004 - 447

We have discovered a very radio-loud Narrow-Line Seyfert 1 candidate: PKS 2004-447. This Seyfert is consistent with the formal definition for NLS1s, although it does not have quite the same spectral features as some typical members of this subclass. Only ROSAT survey data is available at X-ray wavelengths, so it has not been possible to compare this source with other NLS1s at these wavelengths....

ar X iv : a st ro - p h / 01 05 21 3 v 1 1 4 M ay 2 00 1 A Very Radio - Loud Narrow - Line Seyfert 1 : PKS 2004 - 447

We have discovered a very radio-loud Narrow-Line Seyfert 1 candidate: PKS 2004-447. This Seyfert is consistent with the formal definition for NLS1s, although it does not have quite the same spectral features as some typical members of this subclass. Only ROSAT survey data is available at X-ray wavelengths, so it has not been possible to compare this source with other NLS1s at these wavelengths....

ar X iv : a st ro - p h / 01 11 13 6 v 1 7 N ov 2 00 1 1 Active Optics in Modern , Large Optical Telescopes

ar X iv : a st ro - p h / 03 01 09 8 v 1 7 J an 2 00 3 Quasars are more luminous than radio galaxies – so what ? Chris Simpson

Surveys to find high-redshift radio galaxies deliberately exclude optically-bright objects, which may be distant radio-loud quasars. In order to properly determine the space density of supermassive black holes, the fraction of such objects missed must be determined within a quantitative framework for AGN unification. I briefly describe the receding torus model, which predicts that quasars shoul...