J/A+A/622/A23 LoTSS compact groups of galaxies (Nikiel-Wroczynski+, 2019)
Exploring the properties of low-frequency radio emission and magnetic fields in
a sample of compact galaxy groups using the LOFAR Two-Metre Sky Survey (LoTSS).
Nikiel-Wroczynski B., Berger A., Herrera Ruiz N., Bomans D.J., Blex S.,
Horellou C., Paladino R., Becker A., Miskolczi A., Beck R., Chyzy K.,
Dettmar R.-J., Heald G., Heesen V., Jamrozy M., Shimwell T.W., Tasse C.
<Astron. Astrophys., 622, A23 (2019)>
=2019A&A...622A..23N 2019A&A...622A..23N (SIMBAD/NED BibCode)
ADC_Keywords: Galaxies, radio ; Magnetic fields
Keywords: radio continuum: galaxies - galaxies: groups: general -
galaxies: magnetic fields - magnetic fields
Abstract:
We use the LOFAR Two-metre Sky Survey (LoTSS) Data Release I to
identify the groups of galaxies (and individual galaxies) from the
Hickson compact groups (HCG) and magnitude-limited compact groups
(MLCG) samples that emit at the frequency of 150MHz, characterise
their radio emission (extended or limited to the galaxies), and
compare new results to earlier observations and theoretical
predictions. The detection of 73 systems (and 7 more - probably) out
of 120, of which as many as 17 show the presence of extended radio
structures, confirms the previous hypothesis of the common character
of the magnetic field inside galaxy groups and its detectability. In
order to investigate the future potential of low-frequency radio
studies of galaxy groups, we also present a more detailed insight into
four radio-emitting systems, for which the strength of the magnetic
field inside their intergalactic medium (IGM) is calculated. The
estimated values are comparable to that found inside star-forming
galaxies, suggesting a dynamical and evolutionary importance of the
magnetic field in galaxy groups.
Description:
Our sample of galaxy groups consists of "multiple" galaxies in the
area roughly covered by the first LoTSS data release from the HCG
(Hickson et al., 1992, Cat. VII/213) and magnitude-limited compact
groups (MLCG; Sohn et al., 2016, Cat. J/ApJS/225/23) catalogues.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
tablea1.dat 58 80 Sky position, redshift, flux densities, type of
the emission, number of members, and their
overall abundance for HCG and MLCG systems
detected in the LoTSS
tablea2.dat 53 136 Sky position, redshift, and flux densities for
all members of the HCG and MLCG systems
detected in the LoTSS
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See also:
VII/213 : Hickson's Compact groups of Galaxies (Hickson+ 1982-1994)
J/ApJS/225/23 : Compact groups of galaxies from SDSS-DR12 (MLCG) (Sohn+, 2016)
J/A+A/622/A1 : LOFAR Two-metre Sky Survey DR1 source catalog (Shimwell+, 2019)
J/A+A/622/A4 : LOFAR observations XMM-LSS field (Hale+, 2019)
J/A+A/622/A8 : NGC 3184, 4736, 5055 and 5194 LOFAR + WSRT maps (Heesen+, 2019)
J/A+A/622/A11 : LoTSS/HETDEX. Optical quasars. I. (Guerkan+, 2019)
J/A+A/622/A13 : VLA double-double radio galaxy candidates images
(Mahatma+, 2019)
J/A+A/622/A15 : Broad absorption line quasars in LDR1 (Morabito+, 2019)
J/A+A/622/A22 : Abell 1914 multiwavelength radio images (Mandal+, 2019)
Byte-by-byte Description of file: tablea1.dat
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Bytes Format Units Label Explanations
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1- 9 A9 --- Name Name of the system
11 A1 --- Subset [CE] subset either Isolated (E), or
Contained (C)
13- 21 F9.5 deg RAdeg System right ascension (J2000)
23- 30 F8.5 deg DEdeg System declination (J2000)
32- 37 F6.4 --- z Spectroscopic redshift from Sohn et al.
(2016, Cat. J/ApJS/225/23)
39- 44 F6.1 mJy Si6 ? Integrated (measured by BLOBCAT) flux
density of the group at 150MHz
47- 50 F4.1 mJy e_Si6 ? rms uncertainty on Si6
53 A1 --- Type [EGN] Emission type Galactic, or Envelope
( N for not determined)
54 A1 --- n_Type [ab] Note on Type (1)
56 I1 --- Nrcomp Number of members from Sohn et al.
(2016, Cat. J/ApJS/225/23))
58 I1 -- Nremitt ? Number of emitting components
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Note (1): Notes as follows:
a = Visible contamination from background sources;
b = ambiguous detection (e.g. low signal-to-noise ratio).
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Byte-by-byte Description of file: tablea2.dat
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Bytes Format Units Label Explanations
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1- 9 A9 --- Name Name of the system
11 A1 --- n_Name Companion designation (1)
13- 21 F9.5 deg RAdeg System right ascension (J2000)
23- 30 F8.5 deg DEdeg System declination (J2000)
32- 37 F6.4 --- z ?=- Spectroscopic redshift from Sohn et al.
(2016, Cat. J/ApJS/225/23)
40- 45 F6.1 mJy Si6 ? Integrated (measured by BLOBCAT) flux of
the group at 150MHz
46 A1 --- n_Si6 [a?] Note on Si6 (2)
49- 52 F4.1 mJy e_Si6 ? rms uncertainty on Si6
53 A1 --- neSi6 [a?] Note on e_Si6 (2)
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Note (1): Companion designation, according to HyperLeda
(Makarov et al., 2014A&A...570A..13M 2014A&A...570A..13M)
Note (2): Note as follows:
? = flux unknown due to the presence of artefacts/low signal
a = flux unknown due to the affiliation with a larger radio structure
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History:
From electronic version of the journal
References:
Williams et al., Paper II 2019A&A...622A...2W 2019A&A...622A...2W
Duncan et al., Paper III 2019A&A...622A...3D 2019A&A...622A...3D
Hale et al., Paper IV 2019A&A...622A...4H 2019A&A...622A...4H, Cat. J/A+A/622/A4
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Mahatma et al., Paper XIII 2019A&A...622A..13M 2019A&A...622A..13M, Cat. J/A+A/622/A13
Mooney et al., Paper XIV 2019A&A...622A..14M 2019A&A...622A..14M
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Hoang et al., Paper XXI 2019A&A...622A..21H 2019A&A...622A..21H
Mandal et al., Paper XXII 2019A&A...622A..22M 2019A&A...622A..22M, Cat. J/A+A/622/A22
Nikiel-Wroczynski et al., Paper XXIII 2019A&A...622A..23N 2019A&A...622A..23N
Savini et al., Paper XXIV 2019A&A...622A..24S 2019A&A...622A..24S
Wiber et al., Paper XXV 2019A&A...622A..25W 2019A&A...622A..25W
(End) Patricia Vannier [CDS] 01-Apr-2019