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The 2dF galaxy redshift survey: clustering properties of radio galaxies

Magliocchetti, Manuela and Maddox, Steve J. and Hawkins, Ed and Peacock, John A. and Bland-Hawthorn, Joss and Bridges, Terry and Cannon, Russell and Cole, Shaun and Colless, Matthew and Collins, Chris and Couch, Warrick and Dalton, Gavin and de Propris, Roberto and Driver, Simon P. and Efstathiou, George and Ellis, Richard S. and Frenk, Carlos S. and Glazebrook, Karl and Jackson, Carole A. and Jones, Bryn and Lahav, Ofer and Lewis, Ian and Lumsden, Stuart and Norberg, Peder and Peterson, Bruce A. and Sutherland, Will and Taylor, Keith (2004) The 2dF galaxy redshift survey: clustering properties of radio galaxies. Monthly Notices of the Royal Astronomical Society, 350 (4). pp. 1485-1494. ISSN 0035-8711. doi:10.1111/j.1365-2966.2004.07751.x.

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The clustering properties of local, S₁.₄ ≥ 1 mJy, radio sources are investigated for a sample of 820 objects drawn from the joint use of the Faint Images of the Radio Sky at 20 cm (FIRST) and 2dF Galaxy Redshift surveys. To this aim, we present 271 new bⱼ≤ 19.45 spectroscopic counterparts of FIRST radio sources to be added to those already introduced in our previous paper. The two-point correlation function for the local radio population is found to be entirely consistent with estimates obtained for the whole sample of 2dFGRS galaxies. From measurements of the redshift-space correlation function ξ(s) we derive a redshift-space clustering length s₀ = 10.7⁺⁰.⁸−₀.₇ Mpc, while from the projected correlation function Ξr_T we estimate the parameters of the real-space correlation function ξ(r) = (r/r₀) −γ, r₀ = 6.7⁺⁰.⁹ −₁.₁ Mpc and γ= 1.6 ± 0.1, where h = 0.7 is assumed. Different results are instead obtained if we only consider sources that present signatures of active galactic nucleus (AGN) activity in their spectra. These objects are shown to be very strongly correlated, with r₀ = 10.9⁺¹.⁰−₁.₂ Mpc and γ = 2 ± 0.1, a steeper slope than has been claimed in other recent works. No difference is found in the clustering properties of radio-AGNs of different radio luminosity. Comparisons with models for ξ(r) show that AGN-fuelled sources reside in dark matter haloes more massive than ∼10¹³.⁴ M⊙, higher than the corresponding figure for radio-quiet quasi-stellar objects. This value can be converted into a minimum black hole mass associated with radio-loud, AGN-fuelled objects of M^(min)_(BH)∼ 10⁹ M⊙. The above results then suggest – at least for relatively faint radio objects – the existence of a threshold black hole mass associated with the onset of significant radio activity such as that of radio-loud AGNs; however, once the activity is triggered, there appears to be no evidence for a connection between black hole mass and level of radio output.

Item Type:Article
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URLURL TypeDescription Paper
Bland-Hawthorn, Joss0000-0001-7516-4016
Colless, Matthew0000-0001-9552-8075
Ellis, Richard S.0000-0001-7782-7071
Norberg, Peder0000-0002-5875-0440
Additional Information:© 2004 RAS. Accepted 2004 February 18. Received 2004 February 6; in original form 2003 October 30.
Subject Keywords:galaxies: active, galaxies: distances and redshifts, galaxies: starburst, galaxies: statistics, cosmology: observations, radio continuum: galaxies
Issue or Number:4
Record Number:CaltechAUTHORS:20200710-171316627
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Official Citation:Manuela Magliocchetti, Steve J. Maddox, Ed Hawkins, John A. Peacock, Joss Bland-Hawthorn, Terry Bridges, Russell Cannon, Shaun Cole, Matthew Colless, Chris Collins, Warrick Couch, Gavin Dalton, Roberto de Propris, Simon P. Driver, George Efstathiou, Richard S. Ellis, Carlos S. Frenk, Karl Glazebrook, Carole A. Jackson, Bryn Jones, Ofer Lahav, Ian Lewis, Stuart Lumsden, Peder Norberg, Bruce A. Peterson, Will Sutherland, Keith Taylor, The 2dF galaxy redshift survey: clustering properties of radio galaxies, Monthly Notices of the Royal Astronomical Society, Volume 350, Issue 4, June 2004, Pages 1485–1494,
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:104341
Deposited By: Rebecca Minjarez
Deposited On:13 Jul 2020 22:46
Last Modified:16 Nov 2021 18:30

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