J/MNRAS/445/955 Radio-AGN feedback for 0.5<z<1 (Best+, 2014)
The cosmic evolution of radio-AGN feedback to z = 1.
Best P.N., Ker L.M., Simpson C., Rigby E.E., Sabater J.
<Mon. Not. R. Astron. Soc., 445, 955-969 (2014)>
=2014MNRAS.445..955B 2014MNRAS.445..955B (SIMBAD/NED BibCode)
ADC_Keywords: Active gal. nuclei ; Galaxies, radio ; Redshifts
Keywords: accretion, accretion discs - galaxies: active - galaxies: evolution -
galaxies: jets - radio continuum: galaxies
Abstract:
This paper presents the first measurement of the radio luminosity
function of 'jet-mode' (radiatively inefficient) radio-AGN out to
z=1, in order to investigate the cosmic evolution of radio-AGN
feedback. Eight radio source samples are combined to produce a
catalogue of 211 radio-loud AGN with 0.5<z<1.0, which are
spectroscopically classified into jet-mode and radiative-mode
(radiatively efficient) AGN classes. Comparing with large samples of
local radio-AGN from the Sloan Digital Sky Survey, the cosmic
evolution of the radio luminosity function of each radio-AGN class is
independently derived. Radiative-mode radio-AGN show an order of
magnitude increase in space density out to z∼1 at all
luminosities, consistent with these AGN being fuelled by cold gas. In
contrast, the space density of jet-mode radio-AGN decreases with
increasing redshift at low radio luminosities (L1.4GHz≲1024W/Hz)
but increases at higher radio luminosities. Simple models are
developed to explain the observed evolution. In the best-fitting
models, the characteristic space density of jet-mode AGN declines with
redshift in accordance with the declining space density of massive
quiescent galaxies, which fuel them via cooling of gas in their hot
haloes. A time delay of 1.5-2Gyr may be present between the quenching
of star formation and the onset of jet-mode radio-AGN activity. The
behaviour at higher radio luminosities can be explained either by an
increasing characteristic luminosity of jet-mode radio-AGN activity
with redshift (roughly as (1+z)3) or if the jet-mode radio-AGN
population also includes some contribution of cold-gas-fuelled sources
seen at a time when their accretion rate was low. Higher redshifts
measurements would distinguish between these possibilities.
Description:
Eight separate radio surveys with a wide range of flux density limits
were combined in order to develop a large total radio source sample
covering a broad span of radio luminosities. Each of these surveys was
selected to have high spectroscopic completeness from which galaxies
in the target redshift range 0.5<z<1.0 could be drawn.
Observations of a subsample of the galaxies were carried out during
two runs on the William Herschel Telescope (WHT) from 2012 May 22 to
24 and October 18 to 19 (the latter of which was almost entirely lost
to bad weather), with further observations obtained in service mode in
2012 November.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
tablea1.dat 74 211 The properties of the 211-source combined sample
used in the analysis of this paper
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See also:
J/MNRAS/216/173 : Bright extragalactic radio sources at 2.7 GHz (Wall+, 1985)
J/MNRAS/404/1719 : CoNFIG sample II (Gendre+, 2010)
J/MNRAS/416/1900 : CENSORS + other 1.4GHz sources (Rigby+, 2011)
J/MNRAS/346/627 : CENSORS (Combined EIS-NVSS Survey) catalog (Best+, 2003)
J/MNRAS/366/1265 : CENSORS infrared imaging (Brookes+, 2006)
J/MNRAS/385/1297 : CENSORS spectroscopic observations (Brookes+, 2008)
J/MNRAS/416/1900 : CENSORS + other 1.4GHz sources (Rigby+, 2011)
J/MNRAS/421/3060 : Subaru/XMM Deep Field radio imaging. III. (Simpson+, 2012)
Byte-by-byte Description of file: tablea1.dat
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Bytes Format Units Label Explanations
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1- 8 A8 --- Survey Survey (1)
10- 20 A11 --- Source Source name
22 A1 --- f_Source [o] o: observed in the new WHT observations
(see table B1 - flag added at CDS)
24- 31 F8.5 Jy S1.4 [0.0002/22] Flux density at 1.4GHz
33- 37 F5.3 --- z [0.5/1] Redshift
39 A1 --- n_z [PS] Photometric or Spectroscopic redshift
41- 44 F4.2 --- alpha [0.5/1.7]?=- Spectral index α
46- 50 F5.2 [W/Hz] logL [23.4/28.9] Luminosity
52- 74 A23 --- Class Classification: "Radiative-mode", "Jet-mode",
"Quasar (radiative-mode)", or "Unclassified"
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Note (1): Radio surveys used:
WP85 = Wall & Peacock, 1985, J/MNRAS/216/173
CoNFIG = CoNFIG-1 (Gendre et al., 2010, J/MNRAS/404/1719) and
CoNFIG-2r (Ker et al., 2012MNRAS.420.2644K 2012MNRAS.420.2644K)
Parkes = Rigby et al., 2011, J/MNRAS/416/1900
7CRS = Lacy et al. (1999MNRAS.308.1096L 1999MNRAS.308.1096L) and
Willott et al. (2002MNRAS.335.1120W 2002MNRAS.335.1120W)
TOOT = Vardoulaki et al. (2010MNRAS.401.1709V 2010MNRAS.401.1709V)
CENSORS = Best et al. (2003, J/MNRAS/346/627);
Brookes et al. (2006, J/MNRAS/366/1265 and 2008, J/MNRAS/385/1297);
Rigby et al. (2011, J/MNRAS/416/1900)
Hercules = Waddington et al. (2001MNRAS.328..882W 2001MNRAS.328..882W)
SXDF = Simpson et al. (2012, J/MNRAS/421/3060)
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History:
From electronic version of the journal
17-Oct-2015 : Insert into vizieR
12-Jan-2016 : Flag on Source added - all spectroscopic redshifts
with this flag come from the WHT observations.
(End) Patricia Vannier [CDS] 05-May-2015