J/AJ/151/74ivo://CDS.VizieR/J/AJ/151/74doi:10.26093/cds/vizier.51510074CDSYan T.Stocke J.T.Darling J.Momjian E.Sharma S.Kanekar N.2018-05-16T07:04:02Z2018-03-27T14:17:05ZCDS support team

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

cds-question@unistra.fractive-galactic-nucleiradio-continuum-emissionredshiftedspectroscopygalaxy-classification-systemsinterferometryThis is the second paper directed toward finding new highly redshifted atomic and molecular absorption lines at radio frequencies. To this end, we selected a sample of 80 candidates for obscured radio-loud active galactic nuclei (AGNs) and presented their basic optical/near-infrared (NIR) properties in Yan et al. 2012AJ....144..124Y. In this paper, we present both high-resolution radio continuum images for all of these sources and H I 21 cm absorption spectroscopy for a few selected sources in this sample. A-configuration 4.9 and 8.5 GHz Very Large Array continuum observations find that 52 sources are compact or have substantial compact components with size <0.5" and flux densities >0.1 Jy at 4.9 GHz. The 36 most compact sources were then observed with the Very Long Baseline Array at 1.4 GHz. One definite and 10 candidate Compact Symmetric Objects (CSOs) are newly identified, which is a detection rate of CSOs ~three times higher than the detection rate previously found in purely flux-limited samples. Based on possessing compact components with high flux densities, 60 of these sources are good candidates for absorption-line searches. Twenty-seven sources were observed for H I 21 cm absorption at their photometric or spectroscopic redshifts with only six detections (five definite and one tentative). However, five of these were from a small subset of six CSOs with pure galaxy optical/NIR spectra (i.e., any AGN emission is obscured) and for which accurate spectroscopic redshifts place the redshifted 21 cm line in a radio frequency intereference (RFI)-free spectral "window" (i.e., the percentage of H I 21 cm absorption-line detections could be as high as ~90% in this sample). It is likely that the presence of ubiquitous RFI and the absence of accurate spectroscopic redshifts preclude H I detections in similar sources (only 1 detection out of the remaining 22 sources observed, 13 of which have only photometric redshifts); that is, H I absorption may well be present but is masked by the RFI. Future searches for highly redshifted H I and molecular absorption can easily find more distant CSOs among bright, "blank field" radio sources, but will be severely hampered by an inability to determine accurate spectroscopic redshifts due to their lack of rest-frame UV continuum.2016AJ....151...74Yhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/AJ/151/74CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toVIII/60 : Interferometer phase calibration sources (Patnaik+ 1998)VIII/72 : CLASS survey of radio sources (Myers+, 2003)J/A+A/369/380 : CSS/GPS radio sources VLA observations (Fanti+, 2001)J/A+A/416/35 : Radio Emission from VLA FIRST Survey AGN (Wadadekar, 2004)J/ApJ/658/203 : VLBA imaging and polarimetry survey at 5GHz (Helmboldt+, 2007)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/AJ/151/74https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/AJ/151/74http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/AJ/151/74https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/AJ/151/74https://vizier.iucaa.in/viz-bin/votable?-source=J/AJ/151/74http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/AJ/151/74GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/AJ/151/74/table1 (Observing Summary)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/AJ/151/74/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/AJ/151/74/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/AJ/151/74/table1?GETtext/xml+votable180.050000true0.2402375-10.90892220.005555555555555556Cone search capability for table J/AJ/151/74/table11 (VLA 4.9 GHz Gaussian Fit Results)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/AJ/151/74/table11?https://vizier.iucaa.in/viz-bin/conesearch/J/AJ/151/74/table11?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/AJ/151/74/table11?GETtext/xml+votable180.050000true0.240195833-10.9091305560.005555555555555556Cone search capability for table J/AJ/151/74/table13 (VLBA 1.4 GHz Gaussian Fit Results)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/AJ/151/74/table13?https://vizier.iucaa.in/viz-bin/conesearch/J/AJ/151/74/table13?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/AJ/151/74/table13?GETtext/xml+votable180.050000true119.77697666753.21331750.0055555555555555566/4108 4120 4199 4357 4479 4494 4595 4655 4681 4793 4883 4906 4937 5332 5367 5596 5722 5727 5800 6008 6096 6217 6249 6491 6589 6654 7188 7217 7333 7336 8319 8717 8752 8803 9079 9203 9349 9525 9813 9839 10020 10260 10701 10736 10942 11055 11173 11178 11370 11482 11559 11655 11779 11790 17213 17834 19045 25907 25908 26011 26229 26476 26491 26998 27339 27361 27414 27421 27428 27588 27732 27846 27875 27974 27975 28043 28268 28376 31367 31485 31695 367672.4185154563535474e-25 3.2467741526420485e-24https://cdsarc.cds.unistra.fr/viz-bin/moc/J/AJ/151/74?format=asciiRadioOpticaldefaultJ/AJ/151/74/table1Observing SummarySimbadNameSimbad column added by the CDSmeta.idcharRadioRadio namemeta.idcharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameObject name (JHHMM+DDMM)meta.id;meta.maincharNNumber of observational data for this object in the other tablesmeta.numberintnullableDate4.9Date of observation at 4.9 GHztime.epochnullabler_Date4.9[1/15]? Reference for Date4.9 (1)meta.ref;pos.frameintnullableDate8.5Date of observation at 8.5 GHztime.epochnullabler_Date8.5[1/17]? Reference for Date8.5 (1)meta.ref;pos.frameintnullableDateVLBIDate of VLBI observationtime.epochnullabler_DateVLBI[1/19]? Reference for DateVLBI (1)meta.ref;pos.frameintnullableNoteNote(s) (2)meta.notechar_RARight Ascension (J2000) from SIMBAD (not part of the original data)degpos.eq.ra;meta.main_DEDeclination (J2000) from SIMBAD (not part of the original data)degpos.eq.dec;meta.mainJ/AJ/151/74/table2Summary of Radio Galaxy PropertiesS1.4GHz[0.32/4.86] Flux density at 1.4 GHzJyphot.flux.density;em.radio.750-1500MHzfloatrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameObject name (JHHMM+DDMM)meta.id;meta.maincharz[0.122/3.200]? Redshiftsrc.redshiftfloatnullablen_z[*abc] Note on z (1)meta.notecharu_z[:] Uncertainty flag on zmeta.code.error;src.redshiftcharSEDTypeOptical+NIR SED type from Yan et al. (2012AJ....144..124Y) (2)src.classcharGTypeHubble type for pure "G"-type objects in column "SEDType" (3)srccharS365MHz[0.25/8.31] Flux density at 365 MHzJyphot.flux.density;em.radio.200-400MHzfloatS4.9CHz[0.07/3.09] Flux density at 4.9 GHzJyphot.flux.density;em.radio.3-6GHzfloatalphal[0.02/1.28] Low-frequency spectral index, {alpha}_l_, between 365 MHz and 1.4 GHzspect.indexfloatalphah[-1.41/0.37] High-frequency spectral index, {alpha}_h_, between 1.4 and 4.9 GHzspect.indexfloatClassRadio spectral classification (4)src.spTypecharn_Class[a] Note on Class (5)meta.notecharu_Class[:] Uncertainty flag on Classmeta.code.errorcharLAS[0.002/6.6] Largest angular size between major componentsarcsecphys.angSize;stat.maxfloatu_LAS[:] Uncertainty flag on LASmeta.code.errorcharLLS[0.014/45.7] Largest linear sizekpcphys.size.diameterfloatn_LLS[<~] Note on LLS (6)meta.notecharFreq[1.4/8.5] Frequency with which the LAS and LLS are measuredGHzem.freqfloatTelTelescope with which the LAS and LLS are measuredinstr.telcharMorphRadio source morphological classification (7)meta.notecharEval1[YN] Whether the object remains a good candidate for an absorption-line search at radio frequencies (Y=Yes, N=No)meta.codecharEval2Whether the object is an intervening system (I) or candidate (I:)meta.codecharJ/AJ/151/74/table10Basic Observing Resultsn_rms4.9[*] Note on rms4.9 (G1)meta.notecharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameObject name (JHHMM+DDMM)meta.id;meta.maincharMajAxis4.9[0.42/0.97]? Major axis size at 4.9 GHzarcsecphys.angSizefloatnullableMinAxis4.9[0.40/0.49]? Minor axis size at 4.9 GHzarcsecphys.angSize;em.radio.3-6GHzfloatnullablePA4.9[-89.4/87.8]? Position angle of the restored beam at 4.9 GHzdegpos.posAng;instr.beamfloatnullablerms4.9[0.12/0.77]? Map rms ({sigma}) in the vicinity of the source at 4.9 GHzmJy/beaminstr.det.noisefloatnullableSmax4.9[21.6/578.7]? Maximum flux density in the map at 4.9 GHzmJy/beamphot.flux.density;em.radio.3-6GHzfloatnullablen_Smax4.9[*] Note on Smax4.9 (G1)meta.notecharMajAxis8.5[0.24/0.74]? Major axis size at 8.5 GHzarcsecphys.angSizefloatnullableMinAxis8.5[0.23/0.42]? Minor axis size at 8.5 GHzarcsecphys.angSize;em.radio.6-12GHzfloatnullablePA8.5[-175.8/174.3]? Position angle of the restored beam at 8.5 GHzdegpos.posAng;instr.beamfloatnullablerms8.5[0.06/0.71]? Map rms ({sigma}) in the vicinity of the source at 8.5 GHzmJy/beaminstr.det.noisefloatnullablen_rms8.5[*] Note on rms8.5 (G1)meta.notecharSmax8.5[10.0/605.1]? Maximum flux density in the map at 8.5 GHzmJy/beamphot.flux.density;em.radio.6-12GHzfloatnullablen_Smax8.5[*] Note on Smax8.5 (G1)meta.notecharMajAxis1.4[8.12/61.82]? Major axis size at 1.4 GHzarcsecphys.angSizefloatnullableMinAxis1.4[4.86/55.91]? Minor axis size at 1.4 GHzarcsecphys.angSize;em.radio.750-1500MHzfloatnullablePA1.4[-33.9/78.2]? Position angle of the restored beam at 1.4 GHzdegpos.posAng;instr.beamfloatnullablerms1.4[0.11/3.50]? Map rms ({sigma}) in the vicinity of the source at 1.4 GHzmJy/beaminstr.det.noisefloatnullableSmax1.4[7.5/401.1]? Maximum flux density in the map at 1.4 GHzmJy/beamphot.flux.density;em.radio.750-1500MHzfloatnullableJ/AJ/151/74/table11VLA 4.9 GHz Gaussian Fit ResultsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameObject name (JHHMM+DDMM)meta.id;meta.maincharm_NameMultiplicity index on Namemeta.code.multipcharRAJ2000? Hour of Right Ascension (J2000) (1)pos.eq.ra;meta.mainnullableDEJ2000? Degree of Declination (J2000)pos.eq.dec;meta.mainnullableSpeak[0.4/650.6] Peak flux densitymJy/beamphot.flux.density;em.radiofloatn_Speak[*] Note on Speak (not in table 13) (G1)meta.notecharSint[1.8/929.4] Integrated flux densitymJyphot.flux.density;em.radiofloatn_Sint[*] Note on Sint (not in table 13) (G1)meta.notecharMajAxis[0.03/109] Deconvolved major axisarcsecphys.angSizefloatMinAxis[0.00/63] Deconvolved minor axisarcsecphys.angSize;srcfloatPA[0.1/179.2] Position angle of the Gaussian componentdegpos.posAngfloatJ/AJ/151/74/table12VLA 8.5 GHz Gaussian Fit ResultsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameObject name (JHHMM+DDMM)meta.id;meta.maincharm_NameMultiplicity index on Namemeta.code.multipcharSpeak[0.4/650.6] Peak flux densitymJy/beamphot.flux.density;em.radiofloatn_Speak[*] Note on Speak (not in table 13) (G1)meta.notecharSint[1.8/929.4] Integrated flux densitymJyphot.flux.density;em.radiofloatn_Sint[*] Note on Sint (not in table 13) (G1)meta.notecharMajAxis[0.03/109] Deconvolved major axisarcsecphys.angSizefloatMinAxis[0.00/63] Deconvolved minor axisarcsecphys.angSize;srcfloatPA[0.1/179.2] Position angle of the Gaussian componentdegpos.posAngfloatalpha[-3.6/3.1]? Spectral index ({alpha}) calculated between 4.9 and 8.5 GHz (only in table 12)spect.index;em.radio.6-12GHz;meta.modelledfloatnullableJ/AJ/151/74/table13VLBA 1.4 GHz Gaussian Fit ResultsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameObject name (JHHMM+DDMM)meta.id;meta.maincharm_NameMultiplicity index on Namemeta.code.multipcharRAJ2000? Hour of Right Ascension (J2000) (1)pos.eq.ra;meta.mainnullableDEJ2000? Degree of Declination (J2000)pos.eq.dec;meta.mainnullableSpeak[0.4/650.6] Peak flux densitymJy/beamphot.flux.density;em.radiofloatSint[1.8/929.4] Integrated flux densitymJyphot.flux.density;em.radiofloatMajAxis[0.03/109] Deconvolved major axisarcsecphys.angSizefloatMinAxis[0.00/63] Deconvolved minor axisarcsecphys.angSize;srcfloatPA[0.1/179.2] Position angle of the Gaussian componentdegpos.posAngfloat