J/MNRAS/466/4346 Properties of 1329 extended radio galaxies (Miraghaei+, 2017)
The nuclear properties and extended morphologies of powerful radio galaxies:
the roles of host galaxy and environment.
Miraghaei H., Best P.N.
<Mon. Not. R. Astron. Soc., 466, 4346-4363 (2017)>
=2017MNRAS.466.4346M 2017MNRAS.466.4346M (SIMBAD/NED BibCode)
ADC_Keywords: Active gal. nuclei ; Galaxies, radio ; Morphology
Keywords: galaxies: active - galaxies: interactions - radio continuum: galaxies
Abstract:
Powerful radio galaxies exist as either compact or extended sources,
with the extended sources traditionally classified by their radio
morphologies as Fanaroff-Riley (FR) type I and II sources. FRI/FRII
and compact radio galaxies have also been classified by their optical
spectra into two different types: high excitation (HERG; quasar-mode)
and low excitation (LERG; jet-mode). We present a catalogue of visual
morphologies for a complete sample of >1000 1.4-GHz-selected extended
radio sources from the Sloan Digital Sky Survey. We study the
environment and host galaxy properties of FRI/FRII and compact
sources, classified into HERG/LERG types, in order to separate and
distinguish the factors that drive the radio morphological variations
from those responsible for the spectral properties. Comparing FRI
LERGs with FRII LERGs at fixed stellar mass and radio luminosity, we
show that FRIs typically reside in richer environments and are hosted
by smaller galaxies with higher mass surface density; this is
consistent with extrinsic effects of jet disruption driving the
Fanaroff-Riley (FR) dichotomy. Using matched samples of HERGs and
LERGs, we show that HERG host galaxies are more frequently star
forming, with more evidence for disc-like structure than LERGs, in
accordance with currently favoured models of fundamentally different
fuelling mechanisms. Comparing FRI/FRII LERGs with compact LERGs, we
find the primary difference is that compact objects typically harbour
less massive black holes. This suggests that lower mass black holes
may be less efficient at launching stable radio jets, or do so for
shorter times. Finally, we investigate rarer sub-classes:
wide-angle-tailed, head-tail, FR-hybrid and double-double sources.
Description:
We have studied powerful radio galaxies with a wide range of radio
structures, from compact to very extended double-lobe radio sources,
and with a very different optical spectrum, in order to understand the
origin of the observed differences.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 85 1329 Properties of the 1329 extended radio galaxies
with z>0.03
table4.dat 147 245 Properties of FR radio galaxies and compact
radio sources used in our analysis
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Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 4 I4 --- Plate SDSS plate ID
6- 10 I5 d MJD SDSS MJD ID
12- 14 I3 --- Fiber SDSS fiber ID
16- 25 F10.7 h RAhours Right ascension (J2000)
27- 35 F9.5 deg DEdeg Declination (J2000)
37- 42 F6.4 --- z Redshift
45- 49 F5.2 [W/Hz] logLradT Total radio luminosity
51- 58 F8.2 arcsec Sizerad Size of the radio source
61- 63 I3 --- FRclass FR class Morphological classification of
the radio source (1)
65- 85 A21 --- Note Note (from table2 of the paper)
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Note (1): This is expressed in three digits.
The first (left-most) digit indicates the FR class:
(1) represents FRI,
(2) is for FRII,
(3) for hybrid and
(4) unclassifiable.
The second (middle) digit indicates whether the FR classification is
consider certain (0) or less secure (1).
The third (right-most) digit highlights any special nature of the sources:
(0) stands for normal,
(1) for a double-double source,
(2) for a wide-angle-tailed source,
(3) for diffuse and
(4) for head-tail radio galaxies.
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Byte-by-byte Description of file: table4.dat
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Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 4 I4 --- Plate SDSS plate ID
6- 10 I5 d MJD SDSS MJD ID
12- 14 I3 --- Fiber SDSS fiber ID
16- 25 F10.7 h RAhours Right ascension (J2000)
27- 35 F9.5 deg DEdeg Declination (J2000)
38- 44 F7.5 --- z Redshift
46- 50 F5.2 [Msun] logMstar Stellar mass
52- 70 F19.16 kpc R50 Galaxy size
72- 75 F4.2 mag g-r SDSS g-r colour index
77- 80 F4.2 --- D4000 4000Å break strength
82- 85 F4.2 --- C Concentration index, C=R90/R50
87- 93 F7.5 [---] logmu50 Half-light surface mass density
95- 98 F4.2 [Msun] logMBH Black hole mass
100-105 F6.3 --- eta Density defined from the distance to the 10th
nearest neighbour
107-112 F6.3 --- Q Tidal interaction
114-120 F7.3 [-] logn ?=-99 Richness
122-128 F7.4 --- PCA1 PCA1 which traces the overall interaction
level and environmental density of a galaxy
131-137 F7.4 --- PCA2 PCA2 in which a higher value traces higher
one-on-one interactions and a lower value
traces galaxies that are relatively isolated
for their overall environment
139-142 F4.2 [Lsun] logL[OIII] Luminosity from detected [OIII] line
145 I1 --- H/L [0/1]? Type, HERG (1) or LERG (0) (1)
147 I1 --- c/e [0/2]? Classification (2)
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Note (1): Optical spectrum type as follows:
1 = HERG, high excitation
0 = LERG, low excitation
Note (2): Classification as follows:
0 = compact
1 = FRI
2 = FRII
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History:
06-Dec-2019: From electronic version of the journal
27-Mar-2020: units corrected for RA (hours instead of deg)
(End) Patricia Vannier [CDS] 14-Nov-2019