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1999MNRAS.306..137C - Mon. Not. R. Astron. Soc., 306, 137-152 (1999/June-2)
The shape of the blue/UV continuum of B3-VLA radio quasars: dependence on redshift, blue/UV luminosity and radio power.
CARBALLO R., GONZALEZ-SERRANO J.I., BENN C.R., SANCHEZ S.F. and VIGOTTI M.
Abstract (from CDS):
The continuum shape is shown to depend on redshift. For the quasars with z<1.2 we find αblue=0.21±0.16 and αUV=-0.87±0.20, i.e. a higher steepening. For z>1.2, αUV is more flat, -0.48±0.12, and there are too few spectral points longward of 3000 Å to obtain αblue and analyse the presence of the 3000-Å break. A trend similar to that between αUV and z is found between αUV and luminosity at 2400 Å, L2400, with luminous quasars exhibiting a harder spectrum.
The data show an intrinsic correlation between L2400 and the radio power at 408 MHz, not related to selection effects or independent cosmic evolution. The correlations αUV-z, αUV-L2400 and L2400-z appear to be consistent with accretion disc models with approximately constant black hole mass and accretion rates decreasing with time. If the trends L2400-z and P408-z are predominantly related to a selection bias, rather than cosmic evolution, only one of the correlations αUV-L2400 or αUV-z needs to be intrinsic.
Abstract Copyright: 1999 RAS
Journal keyword(s): galaxies: active - galaxies: photometry - quasars: general - ultraviolet: galaxies
Simbad objects: 73
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