J/MNRAS/450/1477ivo://CDS.VizieR/J/MNRAS/450/1477doi:10.26093/cds/vizier.74501477CDSCoppejans R.Cseh D.Williams W.L.van Velzen S.Falcke H2024-08-14T20:21:35Z2015-04-28T12:26:07ZCDS support team

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

cds-question@unistra.frsurveysactive-galactic-nucleiradio-galaxiesradio-sourcesWe present a 324.5MHz image of the NOAO Bootes field that was made using Very Large Array (VLA) P-band observations. The image has a resolution of 5.6"x5.1", a radius of 2.05 degrees and a central noise of ~0.2mJy/beam. Both the resolution and noise of the image are an order of magnitude better than what was previously available at this frequency and will serve as a valuable addition to the already extensive multiwavelength data that are available for this field. The final source catalogue contains 1370 sources and has a median 325 to 1400MHz spectral index of -0.72. Using a radio colour-colour diagram of the unresolved sources in our catalogue, we identify 33 megahertz peaked-spectrum (MPS) sources. Based on the turnover frequency linear size relation for the gigahertz peaked-spectrum (GPS) and compact steep-spectrum (CSS) sources, we expect that the MPS sources that are compact on scales of tens of milliarcseconds should be young radio loud active galactic nuclei at high (z>2) redshifts. Of the 33 MPS sources, we were able to determine redshifts for 24, with an average redshift of 1.3. Given that five of the sources are at z>2, that the four faint sources for which we could not find redshifts are likely at even higher redshifts and that we could only select sources that are compact on a scale of ~5", there is encouraging evidence that the MPS method can be used to search for high-redshift sources.2015MNRAS.450.1477Chttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/MNRAS/450/1477CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/AJ/123/1784 : 1.4GHz imaging of the Bootes field (de Vries+, 2002)J/AJ/127/213 : LALA Bootes field X-ray source catalog (Wang+, 2004)J/AJ/130/923 : Faint radio sources in the NOAO Bootes field (Wrobel+, 2005)J/ApJ/634/L1 : 16 micron sources in the NOAO Bootes field (Kasliwal+, 2005)J/ApJS/161/9 : X-ray survey of the NDWFS Bootes field (Kenter+, 2005)J/ApJ/641/140 : Optical counterparts in the NDWFS Bootes field (Brand+, 2006)J/A+A/535/A38 : Observations of NOAO Bootes field at 153Mhz (Intema+, 2011)J/A+A/549/A55 : GMRT 153MHz (2m) Radio Mini Survey I (Williams+, 2013)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/MNRAS/450/1477https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/MNRAS/450/1477http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/MNRAS/450/1477https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/MNRAS/450/1477https://vizier.iucaa.in/viz-bin/votable?-source=J/MNRAS/450/1477http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/MNRAS/450/1477GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/MNRAS/450/1477/table1 (List of sources and Gaussian component in the VLA 325MHz image)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/MNRAS/450/1477/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/MNRAS/450/1477/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/MNRAS/450/1477/table1?GETtext/xml+votable180.050000true220.4828333.914070.0055555555555555565/2286-2287 2628-2629 6/9135 9139 9142-9143 9192 9194 10501 10503 10520-10521 10524 105602.1534725313611987e-25 2.1534725313611987e-25https://cdsarc.cds.unistra.fr/viz-bin/moc/J/MNRAS/450/1477?format=asciiRadiodefaultJ/MNRAS/450/1477/table1List of sources and Gaussian component in the VLA 325MHz imagerecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintSourceSource identifier (JHHMMSS+DDMMSS) (1)meta.id;meta.maincharm_Source[a-i] Gaussian component (2)meta.code.multipcharRAJ2000Centroid right ascension (J2000)degpos.eq.ra;meta.maine_RAJ2000[0/2] rms uncertainty on RA (1{sigma})arcsecstat.error;pos.eq.rafloatDEJ2000Centroid declination (J2000)degpos.eq.dec;meta.maine_DEJ2000[0/2] rms uncertainty on DEC (1{sigma})arcsecstat.error;pos.eq.decfloatSi[0.1/2013] 325MHz integrated flux densitymJyphot.flux.density;em.radio.200-400MHzfloate_Sirms uncertainty on Si (1{sigma})mJystat.errorfloatSp[0.8/873] 325MHz peak flux density in mJy/beammJyphot.flux.density;em.radio.200-400MHzfloate_Sprms uncertainty on Sp (1{sigma}) in mJy/beammJystat.error;src.spTypefloataDeconvolved major-axisarcsecphys.angSizefloate_arms uncertainty on a (1{sigma})arcsecstat.errorfloatbDeconvolved minor-axisarcsecphys.angSize;srcfloate_brms uncertainty on b (1{sigma})arcsecstat.errorfloatphi[0/180] position angle {phi}degpos.posAngfloate_phirms uncertainty on phi (1{sigma})degstat.errorfloatrmsLocal RMS image noise near source in mJy/beammJyphys.angSize;obs.image;pos.lgfloatNg[1/9]? Number of gaussians out of which the source is composed (2)meta.numberintnullable