J/MNRAS/483/1354ivo://CDS.VizieR/J/MNRAS/483/1354doi:10.26093/cds/vizier.74831354CDSSadler E.M.Chhetri R.Morgan J.Mahony E.K.Jarrett T.H.Tingay S.2024-08-19T20:15:35Z2022-08-10T14:52:02ZCDS support team

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

cds-question@unistra.fractive-galactic-nucleiradio-continuum-emissionquasarsgalaxiesAround 10 per cent of bright low-frequency radio sources observed with the Murchison Wide-field Array (MWA) show strong interplanetary scintillation (IPS) on time-scales of a few seconds, implying that almost all their low-frequency radio emission comes from a compact component less than 0.5arcsec in angular size. Most of these objects are compact steep-spectrum or MHz-peaked spectrum radio sources. We have used mid-infrared data from the Wide-field Infrared Survey Explorer (WISE) catalogue to search for the host galaxies of 65 strongly scintillating MWA sources and compare their properties with those of the overall population of bright low-frequency radio sources. We identified WISE mid-infrared counterparts for 91 per cent of the bright sources in a single 900deg^2^ MWA field, and found that the hosts of the strongly scintillating sources were typically at least 1mag fainter in the WISE W1 (3.4{mu}m) band than the hosts of weakly scintillating MWA sources of similar radio flux density. This difference arises mainly because the strongly scintillating sources are more distant. We estimate that strongly scintillating MWA sources have a median redshift of z~1.5, and that at least 30 per cent of them are likely to lie at z>2. The recently developed wide-field IPS technique therefore has the potential to provide a powerful new tool for identifying high-redshift radio galaxies without the need for radio spectral-index selection.2019MNRAS.483.1354Shttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/MNRAS/483/1354CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/MNRAS/483/1354https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/MNRAS/483/1354http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/MNRAS/483/1354https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/MNRAS/483/1354https://vizier.iucaa.in/viz-bin/votable?-source=J/MNRAS/483/1354http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/MNRAS/483/1354GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/MNRAS/483/1354/table3 (The main IPS-FIRST high S/N sources from the Chhetri et al. (2018MNRAS.474.4937C) IPS sample that lie within the FIRST overlap area)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/MNRAS/483/1354/table3?https://vizier.iucaa.in/viz-bin/conesearch/J/MNRAS/483/1354/table3?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/MNRAS/483/1354/table3?GETtext/xml+votable180.050000true0.24025833-10.908933330.005555555555555556Cone search capability for table J/MNRAS/483/1354/table4 (Expanded list of strongly scintillating (NSI>=0.90, NormSNR>=8.0) sources from the Chhetri et al. (2018MNRAS.474.4937C) IPS sample with no restriction on sky area)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/MNRAS/483/1354/table4?https://vizier.iucaa.in/viz-bin/conesearch/J/MNRAS/483/1354/table4?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/MNRAS/483/1354/table4?GETtext/xml+votable180.050000true2.2750833-20.94230560.005555555555555556Cone search capability for table J/MNRAS/483/1354/table5 (The IPS-MRC-1Jy sources from the Chhetri et al. (2018MNRAS.474.4937C) IPS sample that also appear in the MRC-1Jy sample)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/MNRAS/483/1354/table5?https://vizier.iucaa.in/viz-bin/conesearch/J/MNRAS/483/1354/table5?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/MNRAS/483/1354/table5?GETtext/xml+votable180.050000true0.9495417-23.49502780.0055555555555555566/16471 16476 16494 16496 16500-16501 16509 16511 16593 16614 16617 16621 16625 16632 16635 16638 16643 16655 16659 16668 16676 16684-16686 16688 16692-16693 16696-16697 16699 16702 16704-16705 16707-16709 16712-16713 16722 16725 16733 16739 16749 16754 16773 16776 16781-16784 16787 16792 16802 16816 16821 16833 16836 16855 16879 16882 16886 16891 16967 17213 17217 17223 17227 17230-17231 17233 17235 17237 17241 17244-17245 17247 17254 17264-17265 17267 17270 17276 17362 17365 17414 17423 17439-17440 17443 17449-17450 17452 17469 17487 17507 17513 17515-17516 17519-17520 17547-17548 17551-17552 17555 17558 17560 17563 17567 17569 17571 17576-17578 17580-17581 17584 17588 17592-17593 17600-17601 17604 17606 17618 17620 17624 17633 17639 17642 17644 17662 17793 17922 17925-17928 17933-17935 17937 17940 17950 17966 17972 17979 18000 18017 18065 35692 35696 35699 35723 35735-35736 35742 35754 35761 35768-35769 35771 35774 35779-35780 35783 35786 35788 35792 35794-35795 35798 35801 35806 35810 35812 35816-35817 35833 35836 36392 36484 36487-36489 36493 36512 365281.0734232735494539e-25 6.513807192489934e-20https://cdsarc.cds.unistra.fr/viz-bin/moc/J/MNRAS/483/1354?format=asciiRadiodefaultJ/MNRAS/483/1354/table3The main IPS-FIRST high S/N sources from the Chhetri et al. (2018MNRAS.474.4937C) IPS sample that lie within the FIRST overlap arearecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintSNRclassSubsample name based on the value of NormSNR (1)meta.idcharNameGLEAM name for the source (JHHMMSS+DDMMSS)meta.id;meta.maincharOnameAlternative namemeta.idcharS162162MHz flux density from Chhetri et al. (2018MNRAS.474.4937C, Cat. J/MNRAS/474/4937)Jyphot.flux.density;em.radio.100-200MHzfloate_S162Error on S162Jystat.errorfloatNormSNRNormalized S/N ratio from Chhetri et al. (2018MNRAS.474.4937C, Cat. J/MNRAS/474/4937)stat.snrfloatl_NSIUpper limit on NSI for sources where IPS waw not detectedmeta.code.errorcharNSINormalized scintillation indexsrc.var.indexfloatFIRSTcompNumber of separate FIRST components associated with the GLEAM sourcemeta.numberintRadioclassRadio source classificationmeta.code.classcharRAJ2000Right ascension (J2000) (2)pos.eq.ra;meta.mainDEJ2000Declination (J2000) (2)pos.eq.dec;meta.mainWISEName of matched WISE sourcemeta.idcharW1mag? WISE W1 magnitudemagphot.mag;em.IR.3-4umfloatnullablee_W1mag? Error on W1magmagstat.error;phot.magfloatnullablez? Optical spectroscopic redshiftsrc.redshiftfloatnullabler_zReference for z (G1)meta.ref;pos.framecharNote1[AFP ] Additional notes (3)meta.notecharNote2[*] Indivudal notes in notes.datmeta.notecharJ/MNRAS/483/1354/table4Expanded list of strongly scintillating (NSI>=0.90, NormSNR>=8.0) sources from the Chhetri et al. (2018MNRAS.474.4937C) IPS sample with no restriction on sky arearecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameGLEAM name for the source (JHHMMSS+DDMMSS)meta.id;meta.maincharOnameAlternative namemeta.idcharS162162MHz flux density from Chhetri et al. (2018MNRAS.474.4937C, Cat. J/MNRAS/474/4937)Jyphot.flux.density;em.radio.100-200MHzfloate_S162Error on S162Jystat.errorfloatNormSNRNormalized S/N ratio from Chhetri et al. (2018MNRAS.474.4937C, Cat. J/MNRAS/474/4937)stat.snrfloatNSINormalized scintillation indexsrc.var.indexfloatRAJ2000Right ascension (J2000) (1)pos.eq.ra;meta.mainDEJ2000Declination (J2000) (1)pos.eq.dec;meta.mainWISEName of matched WISE sourcemeta.idcharW1mag? WISE W1 magnitudemagphot.mag;em.IR.3-4umfloatnullablee_W1mag? Error on W1mag16magstat.error;phot.magfloatnullablez? Optical spectroscopic redshiftsrc.redshiftfloatnullabler_zReference for z (G1)meta.ref;pos.framecharNote1[AFP35 ] Additional notes (2)meta.notecharNote2[*] Individual notes in notes.datmeta.notecharJ/MNRAS/483/1354/table5The IPS-MRC-1Jy sources from the Chhetri et al. (2018MNRAS.474.4937C) IPS sample that also appear in the MRC-1Jy samplerecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintS162162MHz flux density from Chhetri et al. (2018MNRAS.474.4937C, Cat. J/MNRAS/474/4937)Jyphot.flux.density;em.radio.100-200MHzfloate_S162Error on S162Jystat.errorfloatNormSNRNormalized S/N ratio from Chhetri et al. (2018MNRAS.474.4937C, Cat. J/MNRAS/474/4937)stat.snrfloatNSINormalized scintillation indexsrc.var.indexfloatRAJ2000Right ascension (J2000) (1)pos.eq.ra;meta.mainDEJ2000Declination (J2000) (1)pos.eq.dec;meta.mainTypeObject type (QSO or galaxy (gal))src.classcharWISEName of matched WISE sourcemeta.idcharW1mag? WISE W1 magnitudemagphot.mag;em.IR.3-4umfloatnullablee_W1mag? Error on W1magmagstat.error;phot.magfloatnullablez? Optical spectroscopic redshiftsrc.redshiftfloatnullabler_zReference for z (G1)meta.ref;pos.framecharNote1[AFP ] Additional notes (2)meta.notecharNote2[*] Individual notes in notes.dat filesmeta.notecharNameGLEAM name for the source (JHHMMSS+DDMMSS)meta.id;meta.maincharOnameAlternative namemeta.idcharl_NSIUpper limit on NSI for sources where IPS was not detectedmeta.code.errorcharJ/MNRAS/483/1354/notesIndividual notes on the sources listed in Tables 3, 4 and 5ONameAlternative namemeta.idcharNotesComments on the sourcemeta.notecharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameGLEAM name for the source (JHHMMSS+DDMMSS)meta.id;meta.mainchar