J/AJ/77/797ivo://CDS.VizieR/J/AJ/77/797doi:10.26093/cds/vizier.50770797CDSPauliny-Toth I.I.K.Kellermann K.I.2013-03-04T06:55:01Z1999-12-20T10:25:03ZCDS support team

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

cds-question@unistra.frradio-sourcessurveysThe 140-ft telescope at the National Radio Astronomy Observatory has been used to extend the 5-GHz strong source (S) survey over an area of 1.14 steradian. Some 240 sources have been detected in this region, of which 135 are above the completeness limit of 0.6f.u. The distribution of spectral indices for sources above the completeness limit is much broader than for samples selected from long-wavelength surveys, owing to an increase in the fraction of compact sources with flat spectra. For about half of the sources selected at 6 cm, the spectral index {alpha}>-0.5. Analysis of the dependence of the spectral index on the flux density shows that, as expected from the 408-MHz number counts and spectral index distribution, at 5 GHz there are fewer flat spectra among the weak sources than among the stronger ones. The spectral index distributions for the identified galaxies and quasars show the familiar forms: the galaxies have a strong concentration near {alpha}=-0.8 with a small tail extending toward flat spectra. The quasars show a much broader distribution of indices, but the fraction (80%) of quasars having flat spectra ({alpha}>-0.5) is much greater than that found in the low-frequency surveys. The number-flux density relation for various groups of sources selected from the 5-GHz survey show that the anomalously steep slope is confined to (a) unidentified sources, (b) sources with steep spectra ({alpha}<-0.5), and (c) sources located in the north galactic hemisphere. Sources identified with radio galaxies or quasars, or which have flat spectra, or which are in the south galactic hemisphere all show a number-flux density slope near -1.5.1972AJ.....77..797Phttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/AJ/77/797CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toVIII/38 : The Parkes-MIT-NRAO 4.85GHz (PMN) Surveys (Griffith+ 1993-1996)J/ApJS/90/173 : PMN map catalog of radiosources (Gregory+, 1994)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/AJ/77/797https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/AJ/77/797http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/AJ/77/797https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/AJ/77/797https://vizier.iucaa.in/viz-bin/votable?-source=J/AJ/77/797http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/AJ/77/797GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/AJ/77/797/table2 (Green Bank 5-GHz strong source survey)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/AJ/77/797/table2?https://vizier.iucaa.in/viz-bin/conesearch/J/AJ/77/797/table2?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/AJ/77/797/table2?GETtext/xml+votable180.050000true1.4884838.3435730.0055555555555555566/370 375 1025 1032 1038 2280 2331 2343 2402 2434 2605 2631 2694 2704 4303 4324 4341 4366 4372 4376 4436 4446 4448 4455 4475 4490 4569 4572 4649 4663 4681 4695 4696 4708 4751 4754 4765 4770 4805 4812 4817 4820 4835 4856 4866 4881 4924 4992 5001 5125 5154 5163 5200 5264 6164 6167 6174 6175 6193 6219 8299 8413 8440 8452 8466 8477 8484 8487 8514 8515 8520 8528 8555 8556 8615 8626 8773 8777 8780 8809 8812 8830 8858 8915 8927 8937 8948 9003 9219 10288 10296 10409 12301 12323 12335 12352 12359 12377 12400 12423 12444 12459 12487 12505 12571 12580 12581 12593 12599 12604 12673 12686 12687 12744 12752 13060 13470 13496 13545 13564 13614 13626 13643 13707 17351 17407 17606 17639 17662 17718 17719 17734 17754 17937 17950 17979 18002 18016 18017 18065 18084 18755 18769 19166 19177 19189 19190 19197 19370 20468 20474 20476 22774 22828 22834 22917 23022 23045 23099 23121 23184 23185 23210 23323 23333 23339 23358 23364 23397 23401 23416 23476 23478 23529 27583 27639 27773 27857 27866 27872 27955 27962 27984 27993 28063 28083 28139 28149 28184 28197 28216 28249 28258 28265 28279 28311 28315 28336 28339 28341 28370 28376 28383 28423 28453 28454 28471 28479 28492 28517 28523 28581 30160 30171 30205 31664 31686 31691 31696 31697 31894 31909 31930 31950 31986 32297 32311 32325 32327 32345 32348 32394 32395 36829 368403.313034785154005e-24 3.313034785154005e-24https://cdsarc.cds.unistra.fr/viz-bin/moc/J/AJ/77/797?format=asciiRadiodefaultJ/AJ/77/797/table2Green Bank 5-GHz strong source surveyrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintS3Object designationmeta.id;meta.maincharRA1950Right ascension (1950.0)pos.eq.ra;meta.mainDE1950Declination (1950.0)pos.eq.dec;meta.mainn_RA1950Origin of the position (1)meta.notecharS5GHzFlux density at 5GHzJyphot.flux.density;em.radio.3-6GHzfloatn_SI[>] > when lower limitmeta.notecharSI? Spectral index below 5GHz (2)spect.index;em.radio.3-6GHzfloatnullablee_SI? rms uncertainty on SIstat.errorfloatnullableIdentOptical identification (4)meta.idcharn_Ident[:] : tentative identification (3)meta.notecharNotesIndividual notes detailed in file "\begin{tex}\vFile{J/AJ/77/797/./notes.dat}{notes.dat}\end{tex}"meta.notecharCatMembership in other catalogsmeta.code.memberchar_RA.icrsRight ascension (ICRS) (computed by VizieR, not part of the original data)pos.eq.ranullableindexed_DE.icrsDeclination (ICRS) (computed by VizieR, not part of the original data)pos.eq.decnullableindexedJ/AJ/77/797/notesNotes on table2.datrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNoteID[1,16]+= Note number, repeated when several lines are needed.meta.noteintTextText of notemeta.notechar