J/MNRAS/446/2985 Double-lobed radio sources catalog (van Velzen+, 2015)
Nature and evolution of powerful radio galaxies at z∼1 and their link with
the quasar luminosity function.
van Velzen S., Falcke H., Kording E.
<Mon. Not. R. Astron. Soc., 446, 2985-3001 (2015)>
=2015MNRAS.446.2985V 2015MNRAS.446.2985V (SIMBAD/NED BibCode)
ADC_Keywords: Radio sources ; Redshifts ; Photometry, SDSS
Keywords: accretion, accretion discs - catalogues - galaxies: jets -
quasars: general
Abstract:
Current wide-area radio surveys are dominated by active galactic
nuclei, yet many of these sources have no identified optical
counterparts. Here we investigate whether one can constrain the nature
and properties of these sources, using Fanaroff-Riley type II (FR II)
radio galaxies as probes. These sources are easy to identify since the
angular separation of their lobes remains almost constant at some tens
of arcseconds for z>1. Using a simple algorithm applied to the Faint
Images of the Radio Sky at Twenty-cm survey, we obtain the largest FR
II sample to date, containing over 104 double-lobed sources. A subset
of 459 sources is matched to Sloan Digital Sky Survey quasars. This
sample yields a statistically meaningful description of the fraction
of quasars with lobes as a function of redshift and luminosity. This
relation is combined with the bolometric quasar luminosity function
and a disc-lobe correlation to obtain a robust prediction for the
density of FR IIs on the radio sky. We find that the observed density
can be explained by the population of known quasars, implying that the
majority of powerful jets originate from a radiatively efficient
accretion flow with a linear jet-disc coupling. Finally, we show that
high-redshift jets are more often quenched within 100kpc, suggesting a
higher efficiency of jet-induced feedback into their host galaxies.
Description:
We derived a model that predicts the FR II density on the radio sky by
using the luminosity function of quasars and a linear relation between
the accretion disc and lobe radio luminosity.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
tablea1.dat 115 59192 Catalog of 59192 double-lobed radio sources
from FIRST, including redshift information for
matches to SDSS quasars
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See also:
VIII/92 : The FIRST Survey Catalog, Version 2014Dec17 (Helfand+ 2015)
Byte-by-byte Description of file: tablea1.dat
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Bytes Format Units Label Explanations
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1- 12 F12.8 deg RAdeg Geometrical center of lobes (J2000)
14- 25 F12.8 deg DEdeg Geometrical center of lobes (J2000)
27- 33 F7.4 Jy Flobe Total lobe flux (1)
35- 42 F8.4 Jy Fcore ?=0 Core flux (zero if no core is detected)
44- 51 F8.4 --- Fratio Lobe-lobe flux ratio
53- 60 F8.6 deg Sep Lobe-lobe separation
62 I1 --- Ngauss [2/8] Number of Gaussian components
64 I1 --- Qual [0/1] Flag: 1 if source passes quality cuts
66- 75 F10.6 deg RAOdeg ?=0 Coordinates of optical quasar
(zero if no match) (J2000)
77- 86 F10.6 deg DEOdeg ?=0 Coordinates of optical quasar
(zero if no match) (J2000)
88- 95 F8.6 --- z ?=0 Redshift
97-103 F7.4 mag imag ?=0 SDSS i-band magnitude (AB)
105-111 F7.4 [10-7W] log10Lbol ?=0 Log10 of bolometric luminosity
(using Hopkins et al., 2007ApJ...654..731H 2007ApJ...654..731H)
113 I1 --- DR ?=0 SDSS Data Release (2)
115 I1 --- Flag [0/1] Flag: 1 if QSO was targeted based on
optical properties
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Note (1): integrated flux from FIRST, corrected for missing flux, see Sect 2.3.
Note (2): SDSS Data Release as follows:
7 = DR7
9 = DR9
0 = no matching QSO
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History:
From electronic version of the journal
(End) Patricia Vannier [CDS] 16-Jun-2015