The presence of interstellar scintillation in the 15 GHz interday variability of 1158 OVRO-monitored blazars

dc.contributorAalto-yliopistofi
dc.contributorAalto Universityen
dc.contributor.authorKoay, J. Y.en_US
dc.contributor.authorJauncey, D. L.en_US
dc.contributor.authorHovatta, Talvikkien_US
dc.contributor.authorKiehlmann, S.en_US
dc.contributor.authorBignall, H. E.en_US
dc.contributor.authorMax-Moerbeck, W.en_US
dc.contributor.authorPearson, T. J.en_US
dc.contributor.authorReadhead, A. C. S.en_US
dc.contributor.authorReeves, R.en_US
dc.contributor.authorReynolds, C.en_US
dc.contributor.authorVedantham, H.en_US
dc.contributor.departmentMetsähovi Radio Observatoryen
dc.contributor.organizationAcademia Sinica Institute of Astronomy and Astrophysicsen_US
dc.contributor.organizationCommonwealth Scientific and Industrial Research Organisation (CSIRO)en_US
dc.contributor.organizationUniversidad de Chileen_US
dc.contributor.organizationCalifornia Institute of Technologyen_US
dc.contributor.organizationUniversidad de Concepciónen_US
dc.date.accessioned2019-11-07T12:07:34Z
dc.date.available2019-11-07T12:07:34Z
dc.date.issued2019-11en_US
dc.description.abstractWe have conducted the first systematic search for interday variability in a large sample of extragalactic radio sources at 15 GHz. From the sample of 1158 radio-selected blazars monitored over an similar to 10 yr span by the Owens Valley Radio Observatory 40-m telescope, we identified 20 sources exhibiting significant flux density variations on 4-d time-scales. The sky distribution of the variable sources is strongly dependent on the line-of-sight Galactic H alpha intensities from the Wisconsin H alpha Mapper Survey, demonstrating the contribution of interstellar scintillation (ISS) to their interday variability. 21 per cent of sources observed through sightlines with H alpha intensities larger than 10 rayleighs exhibit significant ISS persistent over the similar to 10 yr period. The fraction of scintillators is potentially larger when considering less significant variables missed by our selection criteria, due to ISS intermittency. This study demonstrates that ISS is still important at 15 GHz, particularly through strongly scattered sightlines of the Galaxy. Of the 20 most significant variables, 11 are observed through the Orion-Eridanus superbubble, photoionized by hot stars of the Orion OB1 association. The high-energy neutrino source TXS 0506+056 is observed through this region, so ISS must be considered in any interpretation of its short-term radio variability. J0616-1041 appears to exhibit large similar to 20 per cent interday flux density variations, comparable in magnitude to that of the very rare class of extreme, intrahour scintillators that includes PKS0405-385, J1819+3845, and PKS1257-326; this needs to be confirmed by higher cadence follow-up observations.en
dc.description.versionPeer revieweden
dc.format.extent16
dc.format.extent5365-5380
dc.format.mimetypeapplication/pdfen_US
dc.identifier.citationKoay, J Y, Jauncey, D L, Hovatta, T, Kiehlmann, S, Bignall, H E, Max-Moerbeck, W, Pearson, T J, Readhead, A C S, Reeves, R, Reynolds, C & Vedantham, H 2019, ' The presence of interstellar scintillation in the 15 GHz interday variability of 1158 OVRO-monitored blazars ', Monthly Notices of the Royal Astronomical Society, vol. 489, no. 4, pp. 5365-5380 . https://doi.org/10.1093/mnras/stz2488en
dc.identifier.doi10.1093/mnras/stz2488en_US
dc.identifier.issn0035-8711
dc.identifier.issn1365-2966
dc.identifier.otherPURE UUID: b6c5a86c-99a1-4c20-b010-9f1cc076faa2en_US
dc.identifier.otherPURE ITEMURL: https://research.aalto.fi/en/publications/b6c5a86c-99a1-4c20-b010-9f1cc076faa2en_US
dc.identifier.otherPURE FILEURL: https://research.aalto.fi/files/38353245/ELEC_Hovatta_Presence_of_interstellar_MNoRAS.pdfen_US
dc.identifier.urihttps://aaltodoc.aalto.fi/handle/123456789/41147
dc.identifier.urnURN:NBN:fi:aalto-201911076152
dc.language.isoenen
dc.publisherOXFORD UNIV PRESS INC
dc.relation.ispartofseriesMonthly Notices of the Royal Astronomical Societyen
dc.relation.ispartofseriesVolume 489, issue 4en
dc.rightsopenAccessen
dc.subject.keywordscatteringen_US
dc.subject.keywordISM: generalen_US
dc.subject.keywordgalaxies: activeen_US
dc.subject.keywordgalaxies:jetsen_US
dc.subject.keywordquasars: generalen_US
dc.subject.keywordradio continuum: galaxiesen_US
dc.subject.keywordCOMPTON CATASTROPHE SCENARIOen_US
dc.subject.keywordEXTRAGALACTIC RADIO-SOURCESen_US
dc.subject.keywordORION OB1 ASSOCIATIONen_US
dc.subject.keywordINTRADAY VARIABILITYen_US
dc.subject.keywordBRIGHTNESS TEMPERATUREen_US
dc.subject.keywordSKYen_US
dc.subject.keywordSCATTERINGen_US
dc.subject.keywordQUASARen_US
dc.subject.keywordTURBULENCEen_US
dc.titleThe presence of interstellar scintillation in the 15 GHz interday variability of 1158 OVRO-monitored blazarsen
dc.typeA1 Alkuperäisartikkeli tieteellisessä aikakauslehdessäfi
dc.type.versionpublishedVersion
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