J/ApJS/165/439ivo://CDS.VizieR/J/ApJS/165/439doi:10.26093/cds/vizier.21650439CDSRickett B.J.Lazio T.J.W.Ghigo F.D.2017-09-22T16:16:21Z2008-04-16T21:55:54ZCDS support team

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

cds-question@unistra.frbl-lacertae-objectsradio-sourcesFrom 1979 to 1996 the Green Bank Interferometer was used by the Naval Research Laboratory to monitor the flux density from 146 compact radio sources at frequencies near 2 and 8GHz. We filter the light curves to separate intrinsic variations on times of a year or more from more rapid interstellar scintillation (ISS) on times of 550 days. Whereas the intrinsic variation at 2GHz is similar to that at 8GHz (although diminished in amplitude), the ISS variation is much stronger at 2 than at 8GHz. We characterize the ISS variation by an rms amplitude and a timescale and examine the statistics of these parameters for the 121 sources with significant ISS at 2GHz. We model the scintillations using the NE2001 Galactic electron model assuming the sources are brightness-limited.2006ApJS..165..439Rhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJS/165/439CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/ApJS/136/265 : Monitoring compact radio sources at 2.5 + 8.2GHz (Lazio+ 2001)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJS/165/439https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJS/165/439http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJS/165/439https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJS/165/439https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJS/165/439http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJS/165/439GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJS/165/439/table1 (Short-term Variations in GBI Flux Density Monitoring)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJS/165/439/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJS/165/439/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJS/165/439/table1?GETtext/xml+votable180.050000true1.488229238.33754720.0055555555555555566/60 124 579 677 1154 1521 1544 1546 1701 1782 2098 2143 2214 2245 2710 2836 3096 3402 3675 3820 3886 3965 4054 4361 4436 4448 4695 4754 4820 5371 5448 5693 5767 6033 6167 6641 6686 7570 7873 7896 7911 7969 8017 8031 8123 8487 8615 8705 8717 8858 8977 8997 9073 9442 9633 9813 9976 10006 10288 10321 10422 10432 10566 10743 10795 11203 11639 12301 12352 12444 12466 12987 13156 13410 13545 13789 13927 13995 14359 14737 15067 15286 15494 16059 16093 16281 16298 17351 17414 17541 17836 18271 19101 19341 19523 19609 19723 19970 20099 20202 20213 20468 21117 21298 21373 21758 21885 22047 22375 22658 22943 22950 23121 23291 24084 24571 24936 25302 25503 25937 26115 26131 26547 26642 27060 27290 27702 28167 28383 28453 28830 29675 29963 30542 30942 31334 31529 31559 31857 31894 32527 32594 36417 40692 40730 44670 48595https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJS/165/439?format=asciiRadiodefaultJ/ApJS/165/439/table1Short-term Variations in GBI Flux Density MonitoringrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameSource name (HHMM+DDD, B1950)meta.id;meta.maincharLeffEffective length through interstellar plasmakpcarith.factor;pos.distancefloatS2GHzMean 2GHz flux densityJyphot.flux.density;em.radio.1500-3000MHzfloatS8GHzMean 8GHz flux densityJyphot.flux.density;em.radio.6-12GHzfloatm2The 2GHz modulation indexsrc.var.indexfloatq_m2Confidence level in m2 (1)meta.code.qualinttau2Signal timescale at 2GHzdtime.scalefloatTsmSmoothing timedtime.epochintm8The 8GHz modulation indexsrc.var.indexfloatq_m8Confidence level in m8 (1)meta.code.qualinttau8Signal timescale at 8GHzdtime.scalefloatM2The 2GHz rms variation on a 300-day timescale (2)src.var.amplitudefloatM8The 8GHz rms variation on a 300-day timescale (2)src.var.amplitudefloatrho? Cross correlation coefficient between ISS at 2 and 8GHzstat.correlationfloatnullablealphaSpectral index between 2 and 8GHz (3)spect.index;em.radio.6-12GHzfloatS2.4GHzMost compact component VLBI 2.4GHz flux densityJyphot.flux.density;em.radio.1500-3000MHzfloatDiamMost compact component VLBI diametermasphys.angSizefloatSimbadNameSimbad column added by the CDSmeta.idcharSpShow the radio spectrum for this source with SPECFIND (Cat. VIII/74)meta.ref.urlchar_RAComputed Right Ascension for Equinox: J2000degpos.eq.ra;meta.main_DEComputed Declination for Equinox: J2000degpos.eq.dec;meta.main