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dc.identifier.citationThe Astrophysical Journal, 807(2), 150.
dc.description.abstractWe report on 230 GHz (1.3 mm) very long baseline interferometry (VLBI) observations of M87 with the Event Horizon Telescope using antennas on Mauna Kea in Hawaii, Mt. Graham in Arizona, and Cedar Flat in California. For the first time, we have acquired 230 GHz VLBI interferometric phase information on M87 through measurement of the closure phase on the triangle of long baselines. Most of the measured closure phases are consistent with 0° as expected by physically motivated models for 230 GHz structure such as jet models and accretion disk models. The brightness temperature of the event-horizon-scale structure is ∼1 × 10<sup>10</sup> K derived from the compact flux density of ∼1 Jy and the angular size of ∼40 μas ∼ 5.5 R<inf>s</inf>, which is broadly consistent with the peak brightness of the radio cores at 1-86 GHz located within ∼10<sup>2</sup> R<inf>s</inf>. Our observations occurred in the middle of an enhancement in very-high-energy (VHE) γ-ray flux, presumably originating in the vicinity of the central black hole. Our measurements, combined with results of multi-wavelength observations, favor a scenario in which the VHE region has an extended size of ∼20-60 R<inf>s</inf>.en_NZ
dc.publisherIOP Publishingen_NZ
dc.rightsThe American Astronomecal Society (AAS) grants authors the non-exclusive right of republication, subject only to authors giving appropriate credit to the journal in which their article is published. This non-exclusive right of republication includes author's right to allow reproduction of parts of their article wherever they wish, and permits authors to post the published (PDF) version of their article on their personal web site. To protect the copyright in author's article, the original copyright notice as it appears in the journal should be included in the credit.
dc.subjectGalaxies: Activeen_NZ
dc.subjectGalaxies: Individual (M87)en_NZ
dc.subjectGalaxies: Jetsen_NZ
dc.subjectRadio continuum: Galaxiesen_NZ
dc.subjectTechniques: High angular resolutionen_NZ
dc.subjectTechniques: Interferometricen_NZ
dc.title230 GHz VLBI Observations of M87: Event-horizon-scale Structure During an Enhanced Very-high-energy Y-ray State in 2012en_NZ
dc.typeJournal Article
dark.contributor.authorAkiyama, Ken_NZ
dark.contributor.authorLu, R-Sen_NZ
dark.contributor.authorFish, VLen_NZ
dark.contributor.authorDoeleman, SSen_NZ
dark.contributor.authorBroderick, AEen_NZ
dark.contributor.authorDexter, Jen_NZ
dark.contributor.authorHada, Ken_NZ
dark.contributor.authorKino, Men_NZ
dark.contributor.authorNagai, Hen_NZ
dark.contributor.authorHonma, Men_NZ
dark.contributor.authorJohnson, MDen_NZ
dark.contributor.authorAlgaba, JCen_NZ
dark.contributor.authorAsada, Ken_NZ
dark.contributor.authorBrinkerink, Cen_NZ
dark.contributor.authorBlundell, Ren_NZ
dark.contributor.authorBower, GCen_NZ
dark.contributor.authorCappallo, Ren_NZ
dark.contributor.authorCrew, GBen_NZ
dark.contributor.authorDexter, Men_NZ
dark.contributor.authorDzib, SAen_NZ
dark.contributor.authorFreund, Ren_NZ
dark.contributor.authorFriberg, Pen_NZ
dark.contributor.authorGurwell, Men_NZ
dark.contributor.authorHo, PTPen_NZ
dark.contributor.authorInoue, Men_NZ
dark.contributor.authorKrichbaum, TPen_NZ
dark.contributor.authorLoinard, Len_NZ
dark.contributor.authorMacMahon, Den_NZ
dark.contributor.authorMarrone, DPen_NZ
dark.contributor.authorMoran, JMen_NZ
dark.contributor.authorNakamura, Men_NZ
dark.contributor.authorNagar, NMen_NZ
dark.contributor.authorOrtiz-Leon, Gen_NZ
dark.contributor.authorPlambeck, Ren_NZ
dark.contributor.authorPradel, Nen_NZ
dark.contributor.authorPrimiani, RAen_NZ
dark.contributor.authorRogers, AEEen_NZ
dark.contributor.authorRoy, ALen_NZ
dark.contributor.authorSooHoo, Jen_NZ
dark.contributor.authorTavares, J-Len_NZ
dark.contributor.authorTilanus, RPJen_NZ
dark.contributor.authorTitus, Men_NZ
dark.contributor.authorWagner, Jen_NZ
dark.contributor.authorWeintroub, Jen_NZ
dark.contributor.authorYamaguchi, Pen_NZ
dark.contributor.authorYoung, KHen_NZ
dark.contributor.authorZensus, Aen_NZ
dark.contributor.authorZiurys, LMen_NZ
aut.relation.journalAstrophysical Journalen_NZ

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