J/A+A/622/A23ivo://CDS.VizieR/J/A+A/622/A23doi:10.26093/cds/vizier.36220023CDSNikiel-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.2019-07-24T12:28:57Z2019-06-05T11:39:39ZCDS support team

CDS, Observatoire de Strasbourg, 11 rue de l'Universite, F-67000 Strasbourg, France

cds-question@unistra.frradio-galaxiesmagnetic-fieldsWe 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.2019A&A...622A..23Nhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/622/A23CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toVII/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 imagesJ/A+A/622/A15 : Broad absorption line quasars in LDR1 (Morabito+, 2019)J/A+A/622/A22 : Abell 1914 multiwavelength radio images (Mandal+, 2019)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/622/A23https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/622/A23http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/622/A23https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/622/A23https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/622/A23http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/622/A23GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/A+A/622/A23/tablea1 (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)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/622/A23/tablea1?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/622/A23/tablea1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/622/A23/tablea1?GETtext/xml+votable180.050000true173.1472352.947240.005555555555555556Cone search capability for table J/A+A/622/A23/tablea2 (Sky position, redshift, and flux densities for all members of the HCG and MLCG systems detected in the LoTSS)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/622/A23/tablea2?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/622/A23/tablea2?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/622/A23/tablea2?GETtext/xml+votable180.050000true173.1472352.947240.0055555555555555566/5589 5592 5603-5604 5615-5616 5618 5620 5629-5630 5905 5909 5919 5942 5948 5967 5970 5972 5974-5975 5978 5982 5989-5991 5996-5997 6001-6002 6039 6081 10619 10621 10695 10705 10732-10733 10968-10969 10974-10975 10980 10983 11001-11003 11028 11044 11051 11057-11058 11100-11101 11103-11104 11117 11146 11178 11186 11279 11287 11300 11305 11308 11322 11362 11397 11405 11413 11422 11432 11436 117789.939104750406538e-26 9.939104750406538e-26https://cdsarc.cds.unistra.fr/viz-bin/moc/J/A+A/622/A23?format=asciiRadiodefaultJ/A+A/622/A23/tablea1Sky position, redshift, flux densities, type of the emission, number of members, and their overall abundance for HCG and MLCG systems detected in the LoTSSNameName of the systemmeta.id;pos.framecharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintSubset[CE] subset either Isolated (E), or Contained (C)meta.idcharRAJ2000System right ascension (J2000)degpos.eq.ra;meta.mainDEJ2000System declination (J2000)degpos.eq.dec;meta.mainzSpectroscopic redshift from Sohn et al. (2016, Cat. J/ApJS/225/23)src.redshiftfloatSi6? Integrated (measured by BLOBCAT) flux density of the group at 150MHzmJyphot.flux.density;em.radio.100-200MHzfloatnullablee_Si6? rms uncertainty on Si6mJystat.errorfloatnullableType[EGN] Emission type Galactic, or Envelope ( N for not determined)src.classcharn_Type[ab] Note on Type (1)meta.notecharNrcompNumber of members from Sohn et al. (2016, Cat. J/ApJS/225/23))meta.numberintNremitt? Number of emitting componentsmeta.numberintnullableSimbadSimbad column added by the CDSmeta.ref.urlcharJ/A+A/622/A23/tablea2Sky position, redshift, and flux densities for all members of the HCG and MLCG systems detected in the LoTSSrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameName of the systemmeta.id;pos.framecharn_NameCompanion designation (1)meta.notecharRAJ2000System right ascension (J2000)degpos.eq.ra;meta.mainDEJ2000System declination (J2000)degpos.eq.dec;meta.mainz? Spectroscopic redshift from Sohn et al. (2016, Cat. J/ApJS/225/23)src.redshiftfloatnullableSi6? Integrated (measured by BLOBCAT) flux of the group at 150MHzmJyphot.flux.density;em.radio.100-200MHzfloatnullablen_Si6[a?] Note on Si6 (2)meta.notechare_Si6? rms uncertainty on Si6mJystat.errorfloatnullablen_e_Si6[a?] Note on e_Si6 (2)meta.notechar