The Peculiar Light Curve of J1415+1320

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dc.contributor Aalto-yliopisto fi
dc.contributor Aalto University en Vedantham, H. K. Readhead, A.C.S. Hovatta, T. Koopmans, L. V.E. Pearson, T. J. Blandford, R. D. Gurwell, M. A. Lähteenmäki, A. Max-Moerbeck, W. Pavlidou, V. Ravi, V. Reeves, Rodrigo A. Richards, J. L. Tornikoski, M. Zensus, J. A. 2017-10-15T20:40:50Z 2017-10-15T20:40:50Z 2017-08-20
dc.identifier.citation Vedantham , H K , Readhead , A C S , Hovatta , T , Koopmans , L V E , Pearson , T J , Blandford , R D , Gurwell , M A , Lähteenmäki , A , Max-Moerbeck , W , Pavlidou , V , Ravi , V , Reeves , R A , Richards , J L , Tornikoski , M & Zensus , J A 2017 , ' The Peculiar Light Curve of J1415+1320 : A Case Study in Extreme Scattering Events ' Astrophysical Journal , vol 845 , no. 2 , 90 . DOI: 10.3847/1538-4357/aa7741 en
dc.identifier.issn 0004-637X
dc.identifier.issn 1538-4357
dc.identifier.other PURE UUID: 8f31e707-8545-4f22-acb7-f1ac65449d44
dc.identifier.other PURE ITEMURL:
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dc.description.abstract The radio light curve of J1415+1320 (PKS 1413+135) shows time-symmetric and recurring U-shaped features across the centimeter-wave and millimeter-wave bands. The symmetry of these features points to lensing by an intervening object as the cause. U-shaped events in radio light curves in the centimeter-wave band have previously been attributed to Extreme scattering events (ESE). ESEs are thought to be the result of lensing by compact plasma structures in the Galactic interstellar medium, but the precise nature of these plasma structures remains unknown. Since the strength of a plasma lens evolves with wavelength λ as , the presence of correlated variations at over a wide wavelength range casts doubt on the canonical ESE interpretation for J1415+1320. In this paper, we critically examine the evidence for plasma lensing in J1415+1320. We compute limits on the lensing strength and the associated free-free opacity of the putative plasma lenses. We compare the observed and model ESE light curves, and also derive a lower limit on the lens distance based on the effects of parallax due to the Earth's orbit around the Sun. We conclude that plasma lensing is not a viable interpretation for J1415+1320's light curves and that symmetric U-shaped features in the radio light curves of extragalactic sources do not present prima facie evidence for ESEs. The methodology presented here is generic enough to be applicable to any plasma-lensing candidate. en
dc.format.extent 9
dc.format.mimetype application/pdf
dc.language.iso en en
dc.relation.ispartofseries Astrophysical Journal en
dc.relation.ispartofseries Volume 845, issue 2 en
dc.rights openAccess en
dc.subject.other Astronomy and Astrophysics en
dc.subject.other Space and Planetary Science en
dc.subject.other 115 Astronomy and space science en
dc.title The Peculiar Light Curve of J1415+1320 en
dc.type A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä fi
dc.description.version Peer reviewed en
dc.contributor.department California Institute of Technology
dc.contributor.department Metsähovi Radio Observatory
dc.contributor.department University of Groningen
dc.contributor.department Stanford University
dc.contributor.department Harvard University
dc.contributor.department Department of Radio Science and Engineering
dc.contributor.department Max Planck Institute for Radio Astronomy
dc.contributor.department University of Crete
dc.contributor.department Universidad de Concepcion
dc.contributor.department Department of Electronics and Nanoengineering en
dc.subject.keyword BL Lacertae objects: individual (PKS 1413+135)
dc.subject.keyword galaxies: jets
dc.subject.keyword ISM: structure
dc.subject.keyword scattering
dc.subject.keyword Astronomy and Astrophysics
dc.subject.keyword Space and Planetary Science
dc.subject.keyword 115 Astronomy and space science
dc.identifier.urn URN:NBN:fi:aalto-201710157105
dc.identifier.doi 10.3847/1538-4357/aa7741
dc.type.version publishedVersion

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