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: -------------------------------------------------------------------------------- FileName Lrecl Records Explanations -------------------------------------------------------------------------------- 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 -------------------------------------------------------------------------------- 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 -------------------------------------------------------------------------------- Bytes Format Units Label Explanations -------------------------------------------------------------------------------- 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 -------------------------------------------------------------------------------- Note (1): Notes as follows: a = Visible contamination from background sources; b = ambiguous detection (e.g. low signal-to-noise ratio). -------------------------------------------------------------------------------- Byte-by-byte Description of file: tablea2.dat -------------------------------------------------------------------------------- Bytes Format Units Label Explanations -------------------------------------------------------------------------------- 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) -------------------------------------------------------------------------------- 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 -------------------------------------------------------------------------------- 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 de Gasperin et al., Paper V 2019A&A...622A...5D 2019A&A...622A...5D Arias et al., Paper VI 2019A&A...622A...6A 2019A&A...622A...6A Emig et al., Paper VII 2019A&A...622A...7E 2019A&A...622A...7E Heesen et al., Paper VIII 2019A&A...622A...8H 2019A&A...622A...8H, Cat, J/A+A/622/A8 Miskolczi et al., Paper IX 2019A&A...622A...9M 2019A&A...622A...9M Croston et al., Paper X 2019A&A...622A..10C 2019A&A...622A..10C Gurkan et al., Paper XI 2019A&A...622A..11G 2019A&A...622A..11G, Cat. J/A+A/622/A11 Hardcastle et al., Paper XII 2019A&A...622A..12H 2019A&A...622A..12H 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 Morabito et al., Paper XV 2019A&A...622A..15M 2019A&A...622A..15M, Cat. J/A+A/622/A15 O'Sullivan et al., Paper XVI 2019A&A...622A..16O 2019A&A...622A..16O Sabater et al., Paper XVII 2019A&A...622A..17S 2019A&A...622A..17S Stacey et al., Paper XVIII 2019A&A...622A..18S 2019A&A...622A..18S Botteon et al., Paper XIX 2019A&A...622A..19B 2019A&A...622A..19B Hoang et al., Paper XX 2019A&A...622A..20H 2019A&A...622A..20H 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
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