Cosmological Interpretation of Redshift Data on Quasars through the V/V<sub>Max</sub>Test

Schmidt, Maarten

doi:10.1017/s0074180900016235

Cited by 1 publication

(2 citation statements)

References 17 publications

(10 reference statements)

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“…The evolution of low-luminosity radio AGN is less well understood with some studies finding no evidence for any evolution of the RLF for low-luminosity radio AGN (e.g. In order to calculate luminosity functions, the sample must have known redshifts as well as both an optical magnitude limit and a radio flux density limit (Schmidt 1968(Schmidt , 1977. Moreover, the sample volume must be large enough to mitigate the effects of cosmic variance (Moster et al 2011).…”

Section: Computing the Radio Luminosity Functionmentioning

confidence: 99%

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The Australia Telescope Large Area Survey: spectroscopic catalogue and radio luminosity functions

Mao

Sharp

Norris

et al. 2012

Monthly Notices of the Royal Astronomical Society

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The Australia Telescope Large Area Survey (ATLAS) has surveyed 7 square degrees of sky around the Chandra Deep Field South and the European Large Area ISO Survey-South 1 fields at 1.4 GHz. ATLAS aims to reach a uniform sensitivity of 10 μJy beam −1 rms over the entire region with first data release currently reaching ∼ 30μJy beam −1 rms. Here we present 466 new spectroscopic redshifts for radio sources in ATLAS as part of our optical follow-up programme. Of the 466 radio sources with new spectroscopic redshifts, 142 have star-forming optical spectra, 282 show evidence for active galactic nuclei (AGN) in their optical spectra, 10 have stellar spectra and 32 have spectra revealing redshifts, but with insufficient features to classify. We compare our spectroscopic classifications with two mid-infrared diagnostics and find them to be in broad agreement. We also construct the radio luminosity function for star-forming galaxies to z = 0.5 and for AGN to z = 0.8. The radio luminosity function for star-forming galaxies appears to be in good agreement with previous studies. The radio luminosity function for AGN appears higher than previous studies of the local AGN radio luminosity function. We explore the possibility of evolution, cosmic variance and classification techniques affecting the AGN radio luminosity function. ATLAS is a pathfinder for the forthcoming Evolution Map of the Universe (EMU) survey and the data presented in this paper will be used to guide EMU's survey design and early science papers.

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Section: Computing the Radio Luminosity Functionmentioning

confidence: 99%

“…We can now check the completeness of our dataset using the V/VMAX test of Schmidt (1968Schmidt ( , 1977. We calculated both the available and enclosed volumes for each radio source, as well as both the volume and maximum volume out to which the optical source might be detected.…”

Section: V/vmax Testmentioning

confidence: 99%