J/A+A/672/A178 Radio galaxy alignment in ELAIS-N1 (Simonte+, 2023)
Revisiting the alignment of radio galaxies in the ELAIS-N1 field.
Simonte M., Andernach H., Brueggen M., Best P.N., Osinga E.
<Astron. Astrophys. 672, A178 (2023)>
=2023A&A...672A.178S 2023A&A...672A.178S (SIMBAD/NED BibCode)
ADC_Keywords: Active gal. nuclei ; QSOs ; Radio sources ; Galaxies, radio
Keywords: galaxies: active - galaxies: jets - radio continuum: galaxies
Abstract:
We study the alignment of radio galaxies (RG) in the ELAIS-N1 Low
Frequency ARray (LOFAR) deep field, which covers an area of 25 deg2.
The low noise level of below 0.02 mJy/beam of the LOFAR deep field
observations at 144 MHz enabled the identification of 447 extended
radio galaxies (ERG) with apparent radio size larger than 30 arcsec.
For these we measured the major axis radio position angle (RPA). For
95 per cent of these sources have either photometric or spectroscopic
redshifts, we performed a three-dimensional alignment analysis. We
show the distribution of the position angles of radio galaxies in the
ELAIS-N1 field and perform multiple statistical tests to find that the
distribution of position angles is consistent with being uniform. Two
peaks around position angles of 50 and 140 deg are likely spurious and
not caused by clustering of aligned sources in 3D space. Our results
do not support a 2D or 3D alignment of radio galaxies on scales
smaller than ∼4 deg.
Description:
We report radio and optical parameters of 447 radio sources with
projected angular sizes larger than 30 arcsec in the ELAIS N1 LOFAR
Two-metre Sky Survey (LoTSS) Deep Field (ELDF), a circular area of
25 deg2, imaged with 6-arcsec resolution at 144 MHz, centered at
RA,DEC=16:10:35,+54:50:00 (J2000), with central rms noise level of
0.02 mJy/beam. We provide host position, name and type, optical or IR
magnitude, spectroscopic or photometric redshift, angular and linear
radio size, and Fanaroff-Riley (FR) type for the radio morphology. The
projected linear sizes range from 0.02 to 3.55 Mpc, with 30 sources
larger than 1 Mpc and an additional 38 larger than 0.7 Mpc.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
tablea1.dat 104 447 Radio and optical data for 447
Extended Radio Galaxies (ERG)
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See also:
II/328 : AllWISE Data Release (Cutri+ 2013)
II/365 : CatWISE2020 catalog (updated version 28-Jan-2021) (Marocco+, 2021)
II/357 : The Dark Energy Survey (DES): Data Release 1 (Abbott+, 2018)
VII/292 : DESI Legacy Imaging Surveys DR8 (Duncan, 2022)
J/A+A/648/A2 : LoTSS Deep Fields DR1 ELAIS-N1 deep field (Sabater+, 2021)
J/A+A/648/A3 : LoTSS Deep Fields DR1 ELAIS-N1 & Lockman Hole (Kondapally+ 2021)
J/A+A/648/A4 : LoTSS Deep Fields DR1 photometric redshifts (Duncan+, 2021)
Byte-by-byte Description of file: tablea1.dat
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Bytes Format Units Label Explanations
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1- 11 A11 --- Jname ERG object designation, JHHMM+DDMMa (1)
13 A1 --- cflag [C] C if considered a candidate
15- 22 F8.4 deg RAdeg Right ascension (J2000) of ERG host
24- 30 F7.4 deg DEdeg Declination (J2000) of ERG host
32- 36 F5.2 arcmin LAS Largest projected angular size of ERG
38- 40 I3 deg RPA [0,179] radio position angle
42 A1 --- f_RPA [:] : if RPA is uncertain
44- 47 A4 --- FRtype Fanaroff-Riley radio morphological type (2)
49- 53 F5.3 --- z Redshift adopted for the host (3)
55- 58 F4.2 --- e_z ? Uncertainty of the redshift
60 A1 --- ztype [spe] Type of redshift (4)
62- 87 A26 --- Host Name of the ERG host object
89- 90 A2 --- Class Type of host of the ERG (5)
92- 96 F5.2 mag mag Apparent magnitude of host in filter
98- 99 A2 --- Filter r' and r are rmag from SDSS and DES(I),
iK is Kron imag from Pan-STARRS,
W1/2 from AllWISE or CatWISE2020
101-104 F4.2 Mpc LLS Largest projected linear size (6)
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Note (1): the name JHHMM+DDMM is created from truncated J2000 host coordinates.
and letters a and b are attached to it if their hosts lie close to each other.
Note (2): whenever the source shows features of both FR I and FR II type,
we assign I/II and cpx for source too complex to assign an FR type
Note (3): spectroscopic or photometric redshifts were taken from the references:
Ahumada et al., 2020ApJS..249....3A 2020ApJS..249....3A (SDSS DR16, spectroscopic z);
Beck et al., 2016MNRAS.460.1371B 2016MNRAS.460.1371B (SDSS photometric z)
Beck et al., 2021MNRAS.500.1633B 2021MNRAS.500.1633B (Pan-STARRS)
Bilicki et al., 2014ApJS..210....9B 2014ApJS..210....9B (2MASX photometric z)
Bilicki et al., 2016ApJS..225....5B 2016ApJS..225....5B (AllWISE photometric z)
Duncan et al., 2021A&A...648A...4D 2021A&A...648A...4D (LoTSS Deep photometric z)
Duncan et al., 2022MNRAS.512.3662D 2022MNRAS.512.3662D (DESI DR8 photometric z)
Rowan-Robinson et al., 2013MNRAS.428.1958R 2013MNRAS.428.1958R (SWIRE photometric z)
Wen & Han, 2021MNRAS.500.1003W 2021MNRAS.500.1003W (Subaru/unWISE cluster photometric z)
Zhou et al., 2021MNRAS.501.3309Z 2021MNRAS.501.3309Z (DESI DR9 photometric z)
Note (4): Type of redshift as follows:
s = spectroscopic
p = photometric
e = estimated by us
Note (5): Type of host of the ERG as follows:
G = galaxy
Q = quasar
Qc = quasar candidate
? = too faint to classify
Note (6): based on H0 = 70km/s/Mpc, Omegam = 0.3, OmegaLambda = 0.7
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Acknowledgements:
Heinz Andernach, heinz(at)ugto.mx
(End) Heinz Andernach [Univ. Guanajuato], Patricia Vannier [CDS] 10-Mar-2023