J/A+A/681/A79ivo://CDS.VizieR/J/A+A/681/A79doi:10.26093/cds/vizier.36810079CDSEvent Horizon Telescope CollaborationAkiyama K.Alberdi A.Alef W.,Carlos Algaba J.Anantua R.Asada K.Azulay R.Bach U.Baczko A.-K.,Ball D.Balokovic M.Bandyopadhyay B.Barrett J.Bauboeck M.,Benson B.A.Bintley D.Blackburn L.Blundell R.Bouman K.L.Bower G.C.,Boyce H.Bremer M.Brissenden R.Britzen S.Broderick A.E.,Broguiere D.Bronzwaer T.Bustamante S.Carlstrom J.E.Chael A.,Chan C.-k.Chang D.O.Chatterjee K.Chatterjee S.Chen M.-T.Chen Y.,Cheng X.Cho I.Christian P.Conroy N.S.Conway J.E.Crawford T.M.,Crew G.B.Cruz-Osorio A.Cui Y.Dahale R.Davelaar J.De Laurentis M.,Deane R.Dempsey J.Desvignes G.Dexter J.Dhruv V.Dihingia I.K.,Doeleman S.S.Dzib S.A.Eatough R.P.Emami R.Falcke H.Farah J.,Fish V.L.Fomalont E.Ford H.A.Foschi M.Fraga-Encinas R.,Freeman W.T.Friberg P.Fromm C.M.Fuentes A.Galison P.Gammie C.F.,Garcia R.Gentaz O.Georgiev B.Goddi C.Gold R.Gomez-Ruiz A.I.,Gomez J.L.Gu M.Gurwell M.Hada K.Haggard D.Hesper R.Heumann D.,Ho L.C.Ho P.Honma M.Huang C.-W.L.Huang L.Hughes D.H.Ikeda S.,Impellizzeri C.M.V.Inoue M.Issaoun S.James D.J.Jannuzi B.T.,Janssen M.Jeter B.Jiang W.Jimenez-Rosales A.Johnson M.D.,Jorstad S.Jones A.C.Joshi A.V.Jung T.Karuppusamy R.Kawashima T.,Keating G.K.Kettenis M.Kim D.-J.Kim J.-Y.Kim J.Kim J.Kino M.,Yi Koay J.Kocherlakota P.Kofuji Y.Koch P.M.Koyama S.Kramer C.,Kramer J.A.Kramer M.Krichbaum T.P.Kuo C.-Y.La Bella N.Lee S.-S.,Levis A.Li Z.Lico R.Lindahl G.Lindqvist M.Lisakov M.Liu J.,Liu K.Liuzzo E.Lo W.-P.Lobanov A.P.Loinard L.Lonsdale C.J.,Lowitz A.E.Lu R.-S.MacDonald N.R.Mao J.Marchili N.Markoff S.,Marrone D.P.Marscher A.P.Marti-Vidal I.Matsushita S.Matthews L.D.,Medeiros L.Menten K.M.Mizuno I.Mizuno Y.Montgomery J.Moran J.M.,Moriyama K.Moscibrodzka M.Mulaudzi W.Mueller C.Mueller H.Mus A.,Musoke G.Myserlis I.Nagai H.Nagar N.M.Nakamura M.Narayanan G.,Natarajan I.Nathanail A.Navarro Fuentes S.Neilsen J.Ni C.,Nowak M.A.Oh J.Okino H.Olivares H.Oyama T.Oezel F.,Palumbo D.C.M.Filippos Paraschos G.Park J.Parsons H.Patel N.,Pen U.-L.Pesce D.W.Pietu V.PopStefanija A.Porth O.Prather B.,Psaltis D.Pu H.-Y.Ramakrishnan V.Rao R.Rawlings M.G.Raymond A.W.,Rezzolla L.Ricarte A.Ripperda B.Roelofs F.Romero-Canizales C.,Ros E.Roshanineshat A.Rottmann H.Roy A.L.Ruiz I.Ruszczyk C.,Rygl K.L.J.Sanchez S.Sanchez-Argueelles D.Sanchez-Portal M.,Sasada M.Satapathy K.Savolainen T.Schloerb F.P.Schonfeld J.,Schuster K.-F.Shao L.Shen Z.Small D.Won Sohn B.SooHoo J.,Sosapanta Salas L.D.Souccar K.Stanway J.S.Sun H.Tazaki F.,Tetarenko A.J.Tiede P.Tilanus R.P.J.Titus M.Toma K.Torne P.,Toscano T.Traianou E.Trent T.Trippe S.Turk M.van Bemmel I.,Jan van Langevelde H.van Rossum D.R.Vos J.Wagner J.Ward-Thompson D.,Wardle J.Washington J.E.Weintroub J.Wharton R.Wielgus M.Wiik K.,Witzel G.Wondrak M.F.Wong G.N.Wu Q.Yadlapalli N.Yamaguchi P.,Yfantis A.Yoon D.Young A.Younsi Z.Yu W.Yuan F.Yuan Y.-F.,Zensus J.A.Zhang S.Zhao G.-Y.Zhao S.-S.Allardi A.Chang S.-H.,Chang C.-C.Chang S.-C.Chen C.-C.Chilson R.Faber A.Gale D.M.,Han C.-C.Han K.-C.Hasegawa Y.Hernandez-Rebollar J.L.Huang Y.-D.,Jiang H.Jinchi H.Kimura K.Kubo D.Li C.-T.Lin L.C.-C.Liu C.-T.,Liu K.-Y.Lu L.-M.Martin-Cocher P.Meyer-Zhao Z.Montana A.,Moraghan A.Emir Moreno-Nolasco M.Nishioka H.Norton T.J.Nystrom G.,Ogawa H.Oshiro P.Pradel N.Principe G.Raffin P.,Rodriguez-Montoya I.Shaw P.Snow W.Kumara Sridharan T.Srinivasan R.,Wei T.-S.Yu C.-Y.2025-01-09T20:01:00Z2024-01-18T09:11:17ZCDS support team

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

cds-question@unistra.fractive-galactic-nucleivery-long-baseline-interferometrymillimeter-astronomysubmillimeter-astronomyIn April 2019, the Event Horizon Telescope (EHT) Collaboration reported the first-ever event-horizon-scale images of a black hole, resolving the central compact radio source in the giant elliptical galaxy M 87. These images reveal a ring with a southerly brightness distribution and a diameter of ~42{mu}as, consistent with the predicted size and shape of a shadow produced by the gravitationally lensed emission around a supermassive black hole. These results were obtained as part of the April 2017 EHT observation campaign, using a global very long baseline interferometric radio array operating at a wavelength of 1.3mm. Here, we present results based on the second EHT observing campaign, taking place in April 2018 with an improved array, wider frequency coverage, and increased bandwidth. In particular, the additional baselines provided by the Greenland telescope improved the coverage of the array. Multiyear EHT observations provide independent snapshots of the horizon-scale emission, allowing us to confirm the persistence, size, and shape of the black hole shadow, and constrain the intrinsic structural variability of the accretion flow. We have confirmed the presence of an asymmetric ring structure, brighter in the southwest, with a median diameter of 43.3_-3.1_+^1.5^{mu}as. The diameter of the 2018 ring is remarkably consistent with the diameter obtained from the previous 2017 observations. On the other hand, the position angle of the brightness asymmetry in 2018 is shifted by about 30{deg} relative to 2017. The perennial persistence of the ring and its diameter robustly support the interpretation that the ring is formed by lensed emission surrounding a Kerr black hole with a mass ~6.5x10^9^M_{sun}_. The significant change in the ring brightness asymmetry implies a spin axis that is more consistent with the position angle of the large-scale jet.2024A&A...681A..79Ehttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/681/A79CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/ApJ/807/150 : 230GHz VLBI observations of M87 (Akiyama+, 2015)J/A+A/616/A188 : M87 jet VLBI images (Kim+, 2018)J/A+A/673/A159 : Spectral analysis of M87 jet (Ro+, 2023)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/681/A79https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/681/A79http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/681/A79https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/681/A79https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/681/A79http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/681/A79GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/A+A/681/A79/list (Information on fits imag)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/681/A79/list?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/681/A79/list?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/681/A79/list?GETtext/xml+votable180.050000true187.7059312.391120.0055555555555555566/27765https://cdsarc.cds.unistra.fr/viz-bin/moc/J/A+A/681/A79?format=asciiMillimeterRadiodefaultJ/A+A/681/A79/listInformation on fits imagrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintRAJ2000Right Ascension of center (J2000)degpos.eq.ra;meta.mainDEJ2000Declination of center (J2000)degpos.eq.dec;meta.mainNxNumber of pixels along X-axismeta.numberintNyNumber of pixels along Y-axismeta.numberintObs.dateObservation datestime.epoch;obsnullableFreqObserved frequencyGHzem.freqfloatsizeSize of FITS fileKibytephys.size;meta.fitsintFileNameName of FITS file, in subdirectory fitsmeta.id;meta.fitscharTitleTitle of the FITS filemeta.title;meta.fitschar