J/ApJ/869/66ivo://CDS.VizieR/J/ApJ/869/66doi:10.26093/cds/vizier.18690066CDSHarp G.R.Ackermann R.F.Astorga A.Arbunich J.Barrios J.,Hightower K.Meitzner S.Barott W.C.Nolan M.C.Messerschmitt D.G.,Vakoch D.A.Shostak S.Tarter J.C.2020-08-03T06:18:24Z2019-12-30T09:45:35ZCDS support team

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

cds-question@unistra.frinterferometryradio-astronomyexoplanetsquasarsbl-lacertae-objectsastrophysical-maserssupernova-remnantssolar-systemo-starsthe-sunWe report a novel radio autocorrelation search for extraterrestrial intelligence. For selected frequencies across the terrestrial microwave window (1-10GHz), observations were conducted at the Allen Telescope Array to identify artificial non-sinusoidal periodic signals with radio bandwidths greater than 4Hz, which are capable of carrying substantial messages with symbol rates from 4 to 10^6^Hz. Out of 243 observations, about half (101) were directed toward sources with known continuum flux >~1Jy over the sampled bandwidth (quasars, pulsars, supernova remnants, and masers), based on the hypothesis that they might harbor heretofore undiscovered natural or artificial repetitive, phase or frequency modulation. The rest of the observations were directed mostly toward exoplanet stars with no previously discovered continuum flux. No signals attributable to extraterrestrial technology were found in this study. We conclude that the maximum probability that future observations like the ones described here will reveal repetitively modulated emissions is less than 5% for continuum sources and exoplanets alike. The paper concludes by describing a new approach to expanding this survey to many more targets and much greater sensitivity using archived data from interferometers all over the world.2018ApJ...869...66Hhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/869/66CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toVIII/65 : 1.4GHz NRAO VLA Sky Survey (NVSS) (Condon+ 1998)IX/29 : ROSAT All-Sky Survey Faint Source Catalog (Voges+ 2000)VIII/87 : The Allen Telescope Array 20cm Survey (ATATS). I. (Croft+ 2010)J/A+A/410/847 : Galactic emission at decimeter wavelengths (Platania+, 2003)J/ApJ/710/L58 : Coronal type II radio bursts in 2002 (Lobzin+, 2010)J/ApJS/211/24 : Rotation periods of Kepler MS stars (McQuillan+, 2014)J/A+A/581/L5 : Mid-IR/radio correlation for Ghat galaxies (Garrett+, 2015)J/AJ/152/181 : SETI observations of exoplanets with the ATA (Harp+, 2016)J/MNRAS/465/1789 : SCUBA-2 Cosmology Legacy Survey (Geach+, 2017)J/PASP/129/E4501 : Search for extraterrestrial intelligence (Isaacson+, 2017)http://wiki.setiquest.info/ : SETIquest homepagehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/869/66https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/869/66http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/869/66https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/869/66https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/869/66http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/869/66GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJ/869/66/table3 (List of observations for this study)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/869/66/table3?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/869/66/table3?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/869/66/table3?GETtext/xml+votable180.050000true24.2458347.858060.0055555555555555566/89 706 748 1129 1450 1521 1701 1949 2245 2472 2836 3162 3649 3675 3932 4429 4528 4615 4831 5009 5506 5522 5718 6638 6831 7036 7345 7570 7746 7760 7896 8068 8265 9633 10432 10743 11087 11326 11352 11473 12030 12975 13702 13927 14285 14520 14758 14826 14921 14939 15067 15110 15129 15149 15273 15494 16058 18397 18496 18666 19904 19912 20072 20339 21713 22517 24116 24185 24227 24466 24546 24572 26112 26131 26183 26242 26491 26554 26575 26706 26901 26978 26997 27018 27088 27164 27554 27616 27750 27765 27881 27975 28135 28226 28548 29515 29537 29570 30216 30694 30818 36697 40442 40777 43911 44921 48496https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJ/869/66?format=asciiRadiodefaultJ/ApJ/869/66/table3List of observations for this studySimbadNameSimbad column added by the CDSmeta.idcharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintSetSet (1)meta.notecharIDSource identifiermeta.id;meta.maincharRAJ2000? Hour of right ascension (J2000)pos.eq.ra;meta.mainnullableDEJ2000? Degree of declination (J2000)pos.eq.dec;meta.mainnullableTypeObject type of the sourcesrc.classcharFreq[611/8200] Frequence of observationMHzem.freq;obsintl_Flux[~<] Flag on flux (~ = varies)meta.code.error;phot.fluxcharFlux[0/1000000]? Flux at observed frequenceJyphot.flux.density;em.radiodoublenullableDateDate of observationtime.epochnullable