J/A+A/704/A65ivo://CDS.VizieR/J/A+A/704/A65CDSBoxelaarlaar J.M.De Gasperin F.Hardcastle M.J.Croston J.H.,Morabito L.K.van Weeren R.J.Edler H.2026-03-02T06:25:50Z2025-12-04T07:40:57ZCDS support team

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

cds-question@unistra.frradio-galaxiesredshiftedgalaxy-classification-systemsThe Low Frequency Array (LOFAR) is uniquely able to perform deep, high- resolution imaging at frequencies below 100MHz. Observations in this regime, using the Low Band Antenna (LBA) system, are significantly affected by instrumental and ionospheric distortions. Recent developments in calibration techniques have enabled routine production of high-fidelity images at these challenging frequencies. The aim of this paper is to obtain images of the radio sources included in the Third Cambridge catalog, second revised version (3CRR) at an observing frequency of 58MHz, with an angular resolution of approximately 15arcsec and sensitivity to both compact and diffuse radio emission. This work also aims to produce accurate flux measurements for all sources. This dataset is designed to serve as a reference for low-frequency radio galaxy studies and future spectral aging analyses. We present the data reduction and calibration procedures developed for narrowband observations of bright sources with the LOFAR LBA. These include tailored direction-independent calibration strategies optimized for mitigating ionospheric phase corruptions and instrumental effects at 58~MHz. Imaging techniques were refined to reliably recover both small- and large-scale radio structures reliably. We deliver 58MHz radio images for the complete 3CRR sample, with flux density measurements exhibiting an average uncertainty of 10%. These results offer new insights into the energetics and evolution of radio galaxies at low frequencies. We also provide high-resolution models of these sources which is useful for calibrating future surveys. This legacy survey significantly expands the available high-resolution data at low frequencies and is the first fully imaged high-resolution sample at ultra low frequencies (<100MHz). It lays the foundation for future studies of radio galaxy physics, low-energy cosmic-ray populations, and the interplay between radio jets and their environments.2025A&A...704A..65Bhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/704/A65CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/MNRAS/204/151 : Bright radio sources at 178 MHz (3CRR) (Laing+ 1983)https://www.lofar-surveys.org : LOFAR Home Pagehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/704/A65https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/704/A65http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/704/A65https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/704/A65https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/704/A65http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/704/A65GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/A+A/704/A65/tablec1 (3CRR catalogue observed at 58 MHz)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/704/A65/tablec1?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/704/A65/tablec1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/704/A65/tablec1?GETtext/xml+votable180.050000true4.1301379.280660.0055555555555555566/245-246 928 946 1129 1521 1701 2052 2063 2111 2136 2225 2227 2245 2249 2292 2324 2402 2414 2569 2704 2866 2949 2951 3803 4014 4088 4285 4303 4324 4341 4352 4366 4376 4629 4649 4835 5027 5086 5130 5284 5311 5413 5439 5553 5617 5671 5758 5806 5817 6075 6536 6618 6889 7005 7061 7349 7508 7606 7763 7888 7925 7959 8003 8017 8043 8116 8152 8528 8555 8626 8644 8675 8705 8809 8989 9009 9230 9252 9273 9443 9468 9633 9655 9992 10004 10052 10217 10288 10355 10374 10432 10485 10529 10601 10743 10839 10877 10925 11073 11259 11365 11377 11408 11512 11551 11652 11667 11874 12010 12045 12047 12241 12593 12684 12796 13120 13455 13564 13663 13707 13855 14858 15045 15064 15067 15909 16189 16221 16301 18365 18387 19321 19325 19432 19664 19745 19842 19857 19935 20030 20099 20111 20355 22364 22452 22501 22505 23469 23476 23529 24023 24116 24247 27514 27765 27773 27872 27934 27955 28063 28249 28279 28540 28574 31940 31951 32059 32322 323943.843120240194179e-26 9.54153977050123e-26https://cdsarc.cds.unistra.fr/viz-bin/moc/J/A+A/704/A65?format=asciiOpticalRadiodefaultJ/A+A/704/A65/tablec13CRR catalogue observed at 58 MHzrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameObject namemeta.id;meta.maincharRAJ2000Right Ascension (J2000)degpos.eq.ra;meta.mainDEJ2000Declination (J2000)degpos.eq.dec;meta.mainzRedshift of the sourcesrc.redshiftdoubleS58Flux density at 58MHzJyphot.flux.density;em.radio.20-100MHzfloate_S58Uncertainty on flux density at 58MHzJystat.errorfloatBmajMajor axis of the restoring beamarcsecphys.angSizefloatBminMinor axis of the restoring beamarcsecphys.angSize;srcfloatRMSRMS noise in the imagemJy/beaminstr.det.noise;obs.imagedoubleS144? Flux density at 144MHz, calculated from LoTSS HBA DR3 dataJyphot.flux.density;em.radio.100-200MHzfloatnullableSpIndex? Spectral index between 58MHz and 144MHzspect.index;em.radio.20-100MHzfloatnullableSimbadSimbad column added by the CDSmeta.ref.urlchar