J/A+A/704/A137ivo://CDS.VizieR/J/A+A/704/A137CDSRetana-Montenegro E.2026-03-02T06:25:50Z2025-12-05T09:24:12ZCDS support team

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

cds-question@unistra.frsurveysradio-galaxiesradio-continuum-emissionWe present wide-field upgraded Giant Metrewave Radio Telescope (uGMRT) images of the fields around the X-shaped radio galaxies (XRGs) 4C32.25, 4C61.23, and MRC 2011-298 obtained at 400MHz. The observations are calibrated using the extreme peeling method to account for direction-dependent effects across the field of view, as was previously applied to Low-Frequency ARray (LOFAR) data. Our 400 MHz images capture in fine detail the radio morphology of the XRGs, as well as other serendipitous radio sources located in these fields. We use these images along with archival low-frequency and high-frequency radio data to investigate the spectral properties of the XRGs 4C32.25 and 4C61.23. Under the assumption of conditions corresponding to the maximum radio source age, we estimate the spectral ages of both the primary lobes and the wings. These ages indicate that the wings are the oldest component of the XRGs and are a product of past radio activity. Moreover, we have used the radio images available to derive high-resolution spectral index maps for these two XRGs. We find that the spectral index steepens from the primary lobes toward the wings, consistent with our spectral age estimates. These results suggest that precessional and backflow models explain the X-shaped radio morphology of 4C32.25 and 4C61.23, respectively. Finally, taking advantage of our wide-area images, we identify several serendipitous diffuse radio sources located in our XRG fields and cross-reference them with previous surveys.2025A&A...704A.137Rhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/704/A137CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/704/A137https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/704/A137http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/704/A137https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/704/A137https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/704/A137http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/704/A137GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/A+A/704/A137/cat_4c32 (4C32.25 source catalog)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/704/A137/cat_4c32?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/704/A137/cat_4c32?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/704/A137/cat_4c32?GETtext/xml+votable180.050000true128.715132.19190.005555555555555556Cone search capability for table J/A+A/704/A137/cat_4c61 (4C61.23 source catalog)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/704/A137/cat_4c61?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/704/A137/cat_4c61?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/704/A137/cat_4c61?GETtext/xml+votable180.050000true175.844461.29620.005555555555555556Cone search capability for table J/A+A/704/A137/cat_mrc (MRC2011-298 source catalog)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/704/A137/cat_mrc?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/704/A137/cat_mrc?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/704/A137/cat_mrc?GETtext/xml+votable180.050000true304.4069-29.77530.005555555555555556Cone search capability for table J/A+A/704/A137/list (List of fits images)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/704/A137/list?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/704/A137/list?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/704/A137/list?GETtext/xml+votable180.050000true126.674432.325480.0055555555555555565/1262 6/5037 5039 5042 6105-6108 6110 6128-6129 47615 47957 47959 48298 48640 486422.6504278676176564e-25 2.6504278676176564e-25https://cdsarc.cds.unistra.fr/viz-bin/moc/J/A+A/704/A137?format=asciiRadiodefaultJ/A+A/704/A137/cat_4c324C32.25 source catalogrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintSourceSource name (JHHMMSS.ss+DDMMSS.s) (Source_ID)meta.id;meta.maincharRAJ2000Right ascension (J2000) (RA)degpos.eq.ra;meta.maine_RAJ2000rms uncertainty on RAdeg (E_RA)degstat.error;pos.eq.radoubleDEJ2000Declination (J2000) (DEC)degpos.eq.dec;meta.maine_DEJ2000rms uncertainty on DEdeg (E_DEC)degstat.error;pos.eq.decdoubleFtotalIntegrated source flux density at 400MHz (Ftotal)mJyphot.flux.density;em.radio.200-400MHzdoublee_Ftotalrms uncertainty on Ftotal (e_Ftotal)mJystat.errordoubleFpeakPeak flux density at 400HzmJy/beamphot.flux.density;em.radio.200-400MHzdoublee_Fpeakrms uncertainty on Fpeak (e_Fpeak)mJy/beamstat.errordoubleFsmearApproximate correction factor to the peak flux density to account for bandwidth- and time-smearing (Fsmear)instr.paramfloatrmsLocal rms noise used for the source detection (rms)mJy/beamstat.stdev;instr.det.noisedoublePyBDSFCode[S/M] flag indicating the source structure code by PyBDSF (PyBDSF_code) (1)meta.codecharFlagEdge[0/1] an object that is located close to or in a facet edge, which could result in some flux loss (Flag_edge)meta.code.errorintFlagMerged[1/2] a large diffuse source whose separate components are merged into a single one according to a visual inspection (Flag_merged)meta.code.errorintJ/A+A/704/A137/cat_4c614C61.23 source catalogrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintSourceSource name (JHHMMSS.ss+DDMMSS.s) (Source_ID)meta.id;meta.maincharRAJ2000Right ascension (J2000) (RA)degpos.eq.ra;meta.maine_RAJ2000rms uncertainty on RAdeg (E_RA)degstat.error;pos.eq.radoubleDEJ2000Declination (J2000) (DEC)degpos.eq.dec;meta.maine_DEJ2000rms uncertainty on DEdeg (E_DEC)degstat.error;pos.eq.decdoubleFtotalIntegrated source flux density at 400MHz (Ftotal)mJyphot.flux.density;em.radio.200-400MHzdoublee_Ftotalrms uncertainty on Ftotal (e_Ftotal)mJystat.errordoubleFpeakPeak flux density at 400HzmJy/beamphot.flux.density;em.radio.200-400MHzdoublee_Fpeakrms uncertainty on Fpeak (e_Fpeak)mJy/beamstat.errordoubleFsmearApproximate correction factor to the peak flux density to account for bandwidth- and time-smearing (Fsmear)instr.paramfloatrmsLocal rms noise used for the source detection (rms)mJy/beamstat.stdev;instr.det.noisedoublePyBDSFCode[S/M] flag indicating the source structure code by PyBDSF (PyBDSF_code) (1)meta.codecharFlagEdge[0/1] an object that is located close to or in a facet edge, which could result in some flux loss (Flag_edge)meta.code.errorintFlagMerged[1/2] a large diffuse source whose separate components are merged into a single one according to a visual inspection (Flag_merged)meta.code.errorintJ/A+A/704/A137/cat_mrcMRC2011-298 source cataloge_DEJ2000rms uncertainty on DEdeg (E_DEC)degstat.error;pos.eq.decdoubleFtotalIntegrated source flux density at 400MHz (Ftotal)mJyphot.flux.density;em.radio.200-400MHzdoublee_Ftotalrms uncertainty on Ftotal (e_Ftotal)mJystat.errordoubleFpeakPeak flux density at 400HzmJy/beamphot.flux.density;em.radio.200-400MHzdoublerecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintSourceSource name (JHHMMSS.ss+DDMMSS.s) (Source_ID)meta.id;meta.maincharRAJ2000Right ascension (J2000) (RA)degpos.eq.ra;meta.maine_RAJ2000rms uncertainty on RAdeg (E_RA)degstat.error;pos.eq.radoubleDEJ2000Declination (J2000) (DEC)degpos.eq.dec;meta.maine_Fpeakrms uncertainty on Fpeak (e_Fpeak)mJy/beamstat.errordoubleFsmearApproximate correction factor to the peak flux density to account for bandwidth- and time-smearing (Fsmear)instr.paramfloatrmsLocal rms noise used for the source detection (rms)mJy/beamstat.stdev;instr.det.noisedoublePyBDSFCode[S/M] flag indicating the source structure code by PyBDSF (PyBDSF_code) (1)meta.codecharFlagEdge[0/1] an object that is located close to or in a facet edge, which could result in some flux loss (Flag_edge)meta.code.errorintFlagMerged[1/2] a large diffuse source whose separate components are merged into a single one according to a visual inspection (Flag_merged)meta.code.errorintJ/A+A/704/A137/listList of fits imagesrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintRAJ2000Right Ascension of center (J2000)degpos.eq.ra;meta.mainDEJ2000Declination of center (J2000)degpos.eq.dec;meta.mainNxNumber of pixels along X-axismeta.numberintNyNumber of pixels along Y-axismeta.numberintsizeSize of FITS fileKibytephys.size;meta.fitsintFileNameName of FITS file, in subdirectory fitsmeta.id;meta.fitscharTitleTitle of the FITS filemeta.title;meta.fitschar