Title: | Broadband Multi-wavelength Properties of M87 during the 2017 Event Horizon Telescope Campaign |
Authors: | Algaba, J. C. Anczarski, J. Asada, K. Baloković, M. Chandra, S. Cui, Y. Z. Falcone, A. D. GIROLETTI, MARCELLO Goddi, C. Hada, K. Haggard, D. Jorstad, S. Kaur, A. Kawashima, T. Keating, G. Kim, J. Y. Kino, M. Komossa, S. Kravchenko, E. V. Krichbaum, T. P. Lee, S. S. Lu, R. S. Lucchini, M. Markoff, S. Neilsen, J. Nowak, M. A. Park, J. PRINCIPE, GIACOMO Ramakrishnan, V. Reynolds, M. T. Sasada, M. Savchenko, S. S. Williamson, K. E. Akiyama, Kazunori Alberdi, Antxon Alef, Walter Anantua, Richard Azulay, Rebecca Baczko, Anne Kathrin Ball, David Barrett, John Bintley, Dan Benson, Bradford A. Blackburn, Lindy Blundell, Raymond Boland, Wilfred Bouman, Katherine L. Bower, Geoffrey C. Boyce, Hope Bremer, Michael Brinkerink, Christiaan D. Brissenden, Roger Britzen, Silke Broderick, Avery E. Broguiere, Dominique Bronzwaer, Thomas Byun, Do Young Carlstrom, John E. Chael, Andrew Chan, Chi Kwan Chatterjee, Shami Chatterjee, Koushik Chen, Ming Tang Chen, Yongjun Chesler, Paul M. Cho, Ilje Christian, Pierre Conway, John E. Cordes, James M. Crawford, Thomas M. Crew, Geoffrey B. Cruz-Osorio, Alejandro Davelaar, Jordy De Laurentis, Mariafelicia Deane, Roger Dempsey, Jessica Desvignes, Gregory Dexter, Jason Doeleman, Sheperd S. Eatough, Ralph P. Falcke, Heino Farah, Joseph Fish, Vincent L. Fomalont, Ed Ford, H. Alyson Fraga-Encinas, Raquel Friberg, Per Fromm, Christian M. Fuentes, Antonio Galison, Peter Gammie, Charles F. García, Roberto Gentaz, Olivier Georgiev, Boris Gold, Roman Gómez, José L. Gómez-Ruiz, Arturo I. Gu, Minfeng Gurwell, Mark Hecht, Michael H. ANTONELLI, Lucio Angelo BIGONGIARI, Ciro BONNOLI, Giacomo COVINO, Stefano D'ELIA, Valerio DAZZI , FRANCESCO DONINI, ALICE LAMASTRA, Alessandra LOMBARDI, Saverio PAIANO, Simona PERSIC, Massimo PRANDINI, ELISA Righi, Chiara SATURNI, FRANCESCO GABRIELE SPOLON, ALESSIA STAMERRA, Antonio TAVECCHIO, Fabrizio |
Issue Date: | 2021 |
Journal: | THE ASTROPHYSICAL JOURNAL LETTERS |
Number: | 911 |
Issue: | 1 |
First Page: | L11 |
Abstract: | In 2017, the Event Horizon Telescope (EHT) Collaboration succeeded in capturing the first direct image of the center of the M87 galaxy. The asymmetric ring morphology and size are consistent with theoretical expectations for a weakly accreting supermassive black hole of mass ∼6.5 × 109 M o˙. The EHTC also partnered with several international facilities in space and on the ground, to arrange an extensive, quasi-simultaneous multi-wavelength campaign. This Letter presents the results and analysis of this campaign, as well as the multi-wavelength data as a legacy data repository. We captured M87 in a historically low state, and the core flux dominates over HST-1 at high energies, making it possible to combine core flux constraints with the more spatially precise very long baseline interferometry data. We present the most complete simultaneous multi-wavelength spectrum of the active nucleus to date, and discuss the complexity and caveats of combining data from different spatial scales into one broadband spectrum. We apply two heuristic, isotropic leptonic single-zone models to provide insight into the basic source properties, but conclude that a structured jet is necessary to explain M87's spectrum. We can exclude that the simultaneous γ-ray emission is produced via inverse Compton emission in the same region producing the EHT mm-band emission, and further conclude that the γ-rays can only be produced in the inner jets (inward of HST-1) if there are strongly particle-dominated regions. Direct synchrotron emission from accelerated protons and secondaries cannot yet be excluded. |
URI: | http://hdl.handle.net/20.500.12386/31961 |
URL: | https://api.elsevier.com/content/abstract/scopus_id/85105584477 https://iopscience.iop.org/article/10.3847/2041-8213/abef71 |
ISSN: | 2041-8205 |
DOI: | 10.3847/2041-8213/abef71 |
Bibcode ADS: | 2021ApJ...911L..11E |
Fulltext: | open |
Appears in Collections: | 1.01 Articoli in rivista
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