NASA/IPAC EXTRAGALACTIC DATABASE
Date and Time of the Query: 2019-06-20 T14:31:53 PDT
Help | Comment | NED Home

For refcode 2001MNRAS.327..907J:
Retrieve 68 NED objects in this reference.
Please click here for ADS abstract

NED Abstract

Copyright by Royal Astronomical Society. 2001MNRAS.327..907J On the redshift cut-off for steep-spectrum radio sources Matt J. Jarvis, Steve Rawlings, Chris J. Willott, Katherine M. Blundell, Steve Eales and Mark Lacy Accepted 2001 June 25. Received 2001 May 14; in original form 2000 June 19 ABSTRACT We use three samples (3CRR, 6CE and 6C*) selected at low radio frequency to constrain the cosmic evolution in the radio luminosity function (RLF) for the 'most luminous' steep-spectrum radio sources. Though intrinsically rare, such sources give the largest possible baseline in redshift for the complete flux-density-limited samples currently available. Using parametric models to describe the RLF, incorporating distributions in radio spectral shape and linear size, as well as the usual luminosity and redshift, we find that the data are consistent with a constant comoving space density between z ~ 2.5 and z ~ 4.5. We find that this model is favoured over a model with similar evolutionary behaviour to that of optically selected quasars (i.e., a roughly Gaussian distribution in redshift) with probability ratios of ~25:1 and ~100:1 for spatially flat cosmologies with {OMEGA}_{LAMBDA} = 0 and {OMEGA}_{LAMBDA}_ = 0.7 respectively. Within the uncertainties, this evolutionary behaviour may be reconciled with the shallow decline preferred for the comoving space density of flat-spectrum sources by Dunlop & Peacock and Jarvis & Rawlings, in line with the expectations of unified schemes. Keywords: galaxies: active - galaxies: luminosity function, mass function - radio continuum: galaxies.
Retrieve 68 NED objects in this reference.
Please click here for ADS abstract

Back to NED Home