J/MNRAS/518/4290 MeerKaT radio sources subset in G4Jy survey (Sejake+, 2023)
MeerKAT follow-up of enigmatic GLEAM 4-Jy (G4Jy) sources.
Sejake P.K., White S.V., Heywood I., Thorat K., Bester H.L., Makhathini S.,
Fanaroff B.
<Mon. Not. R. Astron. Soc. 518, 4290 (2023)>
=2023MNRAS.518.4290S 2023MNRAS.518.4290S (SIMBAD/NED BibCode)
ADC_Keywords: Radio sources ; Galaxies ; Photometry ; Spectroscopy ; Redshifts ;
References ; Positional data ; Morphology
Keywords: galaxies: active - galaxies: evolution - galaxies: formation -
galaxies: jets
Abstract:
We present the results from studying 140 radio sources in the GLEAM
(GaLactic and Extragalactic All-sky MWA [Murchison Widefield Array])
4-Jy (G4Jy) Sample. These sources were followed-up with MeerKAT to
assess their radio morphology and enable host-galaxy identification,
as existing radio images of 25 to 45-arcsec resolution do not provide
sufficient information. We refer to these sources as the MeerKAT-2019
subset. The aim is to identify the host galaxy of these sources by
visually inspecting the overlays comprising radio data from four
surveys (at 150, 200, 843/1400, and 1300 MHz). Our morphological
classification and host- galaxy identification relies upon the
∼7-arcsec resolution images from MeerKAT (1300 MHz). Through the
visual inspection of the overlays, 14 radio sources in the
MeerKAT-2019 subset have wide-angle tail morphology, 10 are head-tail,
and 5 have X-, S-/Z-shaped morphology. Most of the remaining sources
have the radio morphology of typical symmetric lobes. Of 140 sources,
we find host galaxies for 98 sources, leaving 42 with no identified
host galaxy. These 42 sources still have ambiguous identification even
with higher resolution images from MeerKAT.
Description:
The main objective of this study is to identify the host galaxies of a
subset of 140 G4Jy radio sources, which we regard as the MeerKAT-2019
subset. The MeerKAT-2019 subset sources showed complex 'enigmatic'
radio morphologies at 45 and 25-arcsec resolution images. These
sources were observed with MeerKAT (1.3 GHz and ∼7-arcsec resolution)
using the L-band (856-1712 MHz). We also use radio images from GLEAM,
TGSS ADR1, SUMSS, NVSS surveys. More, we complete radio surveys with
MIR AllWISE and 6dFGS, 2MRS optical redshift surveys.
As table results, we provide tablea1.dat containing G4Jy and host
names, astrometric positions, redshifts, spectral indices, host galaxy
and morphology classes, radio fluxes and luminosities at 1300 and
1400MHz and linear sizes for the 140 MeerKAT observed radio sources.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
tablea1.dat 194 140 Properties of G4Jy radio sources in the
MeerKAT-2019 subset
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See also:
II/347 : KiDS-ESO-DR3 multi-band source catalog (de Jong+, 2017)
II/349 : The Pan-STARRS release 1 (PS1) Survey - DR1 (Chambers+,2016)
J/A+A/598/A78 : The GMRT 150MHz all-sky radio survey (Intema+, 2017)
J/A+A/544/A18 : Radio galaxies of the local universe (van Velzen+, 2012)
J/MNRAS/421/1569 : Properties of 18286 SDSS radio galaxies (Best+, 2012)
J/MNRAS/204/151 : Bright radio sources at 178 MHz (3CRR) (Laing+ 1983)
J/ApJS/199/26 : The 2MASS Redshift Survey (2MRS) (Huchra+, 2012)
J/A+AS/132/31 : Kinematical models for double radio sources (Nilsson, 1998)
J/AJ/131/114 : The Molonglo Southern 4Jy sample. II (Burgess+, 2006)
J/ApJS/124/285 : VLA Images of Extragalactic Objects (Reid+, 1999)
J/ApJS/80/137 : Southern Extragalactic Radio Sources (Jones+, 1992)
V/147 : The SDSS Photometric Catalogue, Release 12 (Alam+, 2015)
VII/233 : 2MASS All-Sky Extended Source Catalog (XSC)
(IPAC-UMass, 2003-2006)
VII/259 : 6dF galaxy survey final redshift release (Jones+, 2009)
VII/273 : The Half Million Quasars (HMQ) catalogue (Flesch, 2015)
VIII/100 : GaLactic and Extragalactic All-sky MWA survey
(Hurley-Walker+, 2016)
VIII/105 : The GLEAM 4-Jy (G4Jy) Sample (White+, 2020)
VIII/50 : VLA Survey of Rich Clusters of Galaxies (Slee+ 1996)
VIII/65 : 1.4GHz NRAO VLA Sky Survey (NVSS) (Condon+ 1998)
VIII/70 : Sydney University Molonglo Sky Survey (SUMSS) (Mauch+ 2003)
VIII/82 : 2nd Epoch Molonglo Galactic Plane Survey (MGPS-2)
(Murphy+, 2007)
Byte-by-byte Description of file: tablea1.dat
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Bytes Format Units Label Explanations
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1- 9 A9 --- G4Jy The G4Jy name designation as G4Jy NNNN
(G4Jy_name)
11- 30 A20 --- GLEAM The host GLEAM name designation as
GLEAM JHHMMSS+DDMMSS (GLEAM_name)
32- 40 F9.5 deg RAdeg Right ascension of the source center (J2000)
(Centroid_RAJ2000)
42- 50 F9.5 deg DEdeg Declination of the source center (J2000)
(Centroid_DEJ200)
52 A1 --- f_Galaxy Host identification flag (Host_flag) (1)
54- 81 A28 --- Galaxy The host galaxy name (Host_galaxy)
83- 91 F9.5 --- RAHdeg ? Right ascension of the host galaxy (J2000)
(Host_RAJ2000)
93-101 F9.5 --- DEHdeg ? Declination of the host galaxy (J2000)
(Host_DEJ2000)
103-108 F6.4 --- z ? Redshift (Redshift)
110-119 A10 --- r_z Literature reference of z
(Redshift_reference) (2)
121-126 F6.3 --- alpha ? Spectral index between 151 and 1300 MHz as
explained in section 3.6 equation 1
(alpha1511300)
128-135 F8.3 mJy/beam SC13 ? The core intensity at 1300 MHz
(Score1300MHz)
137-141 F5.3 Jy S13 ? Integrated flux density at 1300 MHz
(totalintflux_1300)
143-147 F5.3 Jy e_S13 ? Error of S13 (errtotalintflux1300)
149-154 F6.4 Jy S14 ? Integrated flux density at 1400 MHz
(totalintflux_1400)
156-167 E12.7 W/Hz L13 ? Radio luminosities at 1300 MHz
(Luminosity_1300) (3)
169-180 E12.7 W/Hz L14 ? Radio luminosities at 1400 MHz
(Luminosity_1400) (3)
182-186 F5.3 Mpc LS ? Linear size of the galaxy (Linear_size)
188-194 A7 --- Morph The radio morphology label based on MeerKAT
∼7-arcsec resolution images (Morphology) (4)
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Note (1): Host galaxy identification flags are as follows:
i = The source has a corresponding host galaxy identified in the
AllWISE/2MASS catalogue, 98 sources in our sample
u = It is unclear which AllWISE or 2MASS source is the host galaxy
as (1) the source has complex radio morphology or (2) there is
no radio core detected in the MeerKAT image that coincides with
the AllWISE/2MASS position, 24 sources in our sample
m = Either the source is affected by nearby bright mid-infrared
emission, or there is no corresponding AllWISE position,
18 sources in our sample
Note (2): Literature references are as follows:
6dFGS = The 6-degree Field Galaxy Survey,
Jones et al. 2009MNRAS.399..683J 2009MNRAS.399..683J, Cat. VII/259,
20 sources in our sample
Ned = NASA/IPAC Extragalactic database (NED),
10 sources in our sample
milliquas = Half Million Quasars (HMQ) Catalogue,
Flesch 2015PASA...32...10F 2015PASA...32...10F, Cat. VII/273, Cat. VII/277,
Cat. VII/280, Cat. VII/283, Cat. VII/290,
10 sources in our sample
2MRS = The 2 Micron All Sky Survey Redshift Survey,
Huchra et al. 2012ApJS..199...26H 2012ApJS..199...26H, Cat. J/ApJS/199/26,
5 sources in our sample
KiDS_DR3 = Kilo-Degree Survey DR3,
De Jong et al. 2017A&A...604A.134D 2017A&A...604A.134D, Cat. II/347,
1 source in our sample
SDSS12_zph = The SDSS Photometric Catalogue, Release 12,
photometric redshift,
Alam S. et al. 2015ApJS..219...12A 2015ApJS..219...12A, Cat. V/147,
1 source in our sample
SDSS12_zsp = The SDSS Photometric Catalogue, Release 12,
spectroscopic redshift,
Alam S. et al. 2015ApJS..219...12A 2015ApJS..219...12A, Cat. V/147,
1 source in our sample
SDSS16 = Sloan Digital Sky Surveys (SDSS), Release 16 (DR16),
Ahumada et al. 2020ApJS..249....3A 2020ApJS..249....3A, Cat. V/154,
1 source in our sample
Note (3): Radio luminosities are computed as in section 5.3.2 equation 2.
Note (4): The radio morphologies are as follows:
Single = The radio source has a compact morphology in the MeerKAT
image, 10 sources in our sample
Double = The radio source has two distinct lobes in the MeerKAT
image but there is no detection of the radio core, or the
source has an extended, elongated emission which is
suggestive of radio lobes in the MeerKAT image,
78 sources in our sample
Triple = The radio source has a radio core and two distinct radio
lobes in the MeerKAT image,
34 sources in our sample
Complex = The radio source has a morphology that does not meet the
above three categories,
16 sources in our sample
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History:
From electronic version of the journal
(End) Luc Trabelsi [CDS] 13-Jan-2026