Millimeter Light Curves of Sagittarius A* Observed during the 2017 Event Horizon Telescope Campaign
Artikel i vetenskaplig tidskrift, 2022
The Event Horizon Telescope (EHT) observed the compact radio source, Sagittarius A* (Sgr A*), in the Galactic Center on 2017 April 5-11 in the 1.3 mm wavelength band. At the same time, interferometric array data from the Atacama Large Millimeter/submillimeter Array and the Submillimeter Array were collected, providing Sgr A* light curves simultaneous with the EHT observations. These data sets, complementing the EHT very long baseline interferometry, are characterized by a cadence and signal-to-noise ratio previously unattainable for Sgr A* at millimeter wavelengths, and they allow for the investigation of source variability on timescales as short as a minute. While most of the light curves correspond to a low variability state of Sgr A*, the April 11 observations follow an X-ray flare and exhibit strongly enhanced variability. All of the light curves are consistent with a red-noise process, with a power spectral density (PSD) slope measured to be between -2 and -3 on timescales between 1 minute and several hours. Our results indicate a steepening of the PSD slope for timescales shorter than 0.3 hr. The spectral energy distribution is flat at 220 GHz, and there are no time lags between the 213 and 229 GHz frequency bands, suggesting low optical depth for the event horizon scale source. We characterize Sgr A*'s variability, highlighting the different behavior observed just after the X-ray flare, and use Gaussian process modeling to extract a decorrelation timescale and a PSD slope. We also investigate the systematic calibration uncertainties by analyzing data from independent data reduction pipelines.
Författare
Maciek Wielgus
Max-Planck-Gesellschaft
Nicola Marchili
Max-Planck-Gesellschaft
Istituto nazionale di astrofisica (INAF)
Ivan Marti-Vidal
Universitat de Valencia
Garrett K. Keating
Harvard-Smithsonian Center for Astrophysics
Venkatessh Ramakrishnan
Turun Yliopisto
Universidad de Concepción
Aalto-Yliopisto
Paul Tiede
Harvard-Smithsonian Center for Astrophysics
Harvard University
Ed Fomalont
National Radio Astronomy Observatory
Sara Issaoun
Harvard-Smithsonian Center for Astrophysics
Joseph Neilsen
Villanova University
Michael A. Nowak
Washington University in St. Louis
Lindy Blackburn
Harvard-Smithsonian Center for Astrophysics
Harvard University
Charles F. Gammie
University of Illinois
Ciriaco Goddi
Istituto nazionale di astrofisica (INAF)
Universita degli Studi di Cagliari
Daryl Haggard
McGill University
Daeyoung Lee
University of Illinois
Monika Moscibrodzka
Radboud Universiteit
Alexandra J. Tetarenko
Texas Tech University at Lubbock
Geoffrey C. Bower
Academia Sinica
University of Hawaii
Chi-kwan Chan
University of Arizona
Koushik Chatterjee
Harvard-Smithsonian Center for Astrophysics
Harvard University
Paul M. Chesler
Harvard University
Jason Dexter
University of Colorado at Boulder
Sheperd S. Doeleman
Harvard University
Harvard-Smithsonian Center for Astrophysics
Boris Georgiev
University of Waterloo
Perimeter Institute for Theoretical Physics
Mark Gurwell
Harvard-Smithsonian Center for Astrophysics
Michael D. Johnson
Harvard University
Harvard-Smithsonian Center for Astrophysics
Daniel P. Marrone
University of Arizona
Alejandro Mus
Universitat de Valencia
Dimitrios Psaltis
University of Arizona
Bart Ripperda
Flatiron Institute
Princeton University
Gunther Witzel
Max-Planck-Gesellschaft
Kazunori Akiyama
Harvard University
National Astronomical Observatory of Japan
Massachusetts Institute of Technology (MIT)
Antxon Alberdi
Consejo Superior de Investigaciones Científicas (CSIC)
Walter Alef
Max-Planck-Gesellschaft
Juan Carlos Algaba
University of Malaya
Richard Anantua
Harvard-Smithsonian Center for Astrophysics
Harvard University
University of Texas at San Antonio
Keiichi Asada
Academia Sinica
Rebecca Azulay
Max-Planck-Gesellschaft
Universitat de Valencia
Uwe Bach
Max-Planck-Gesellschaft
Anne-Kathrin Baczko
Max-Planck-Gesellschaft
David Ball
University of Arizona
Mislav Balokovic
Yale University
John Barrett
Massachusetts Institute of Technology (MIT)
Michi Baubock
University of Illinois
Bradford A. Benson
University of Chicago
Fermi National Accelerator Laboratory
Dan Bintley
East Asian Observatory
James Clerk Maxwell Telescope
Raymond Blundell
Harvard-Smithsonian Center for Astrophysics
Wilfred Boland
Nederlandse Onderzoekschool voor Astronomie (NOVA)
Katherine L. Bouman
California Institute of Technology (Caltech)
Hope Boyce
McGill University
Michael Bremer
Institut de Radioastronomie Millimétrique (IRAM)
Christiaan D. Brinkerink
Radboud Universiteit
Roger Brissenden
Harvard University
Harvard-Smithsonian Center for Astrophysics
Silke Britzen
Max-Planck-Gesellschaft
Avery E. Broderick
University of Waterloo
Perimeter Institute for Theoretical Physics
Dominique Broguiere
Institut de Radioastronomie Millimétrique (IRAM)
Thomas Bronzwaer
Radboud Universiteit
Sandra Bustamante
University of Massachusetts
Do-Young Byun
Korea Astronomy and Space Science Institute
University of Science and Technology (UST)
John E. Carlstrom
University of Chicago
Chiara Ceccobello
Chalmers, Rymd-, geo- och miljövetenskap, Astronomi och plasmafysik
Andrew Chael
Princeton University
Shami Chatterjee
Cornell University
Ming-Tang Chen
Academia Sinica
Yongjun Chen
Chinese Academy of Sciences
Ilje Cho
Consejo Superior de Investigaciones Científicas (CSIC)
Pierre Christian
Fairfield University
Nicholas S. Conroy
Harvard-Smithsonian Center for Astrophysics
University of Illinois
John Conway
Chalmers, Rymd-, geo- och miljövetenskap, Onsala rymdobservatorium
James M. Cordes
Cornell University
Thomas M. Crawford
University of Chicago
Geoffrey B. Crew
Massachusetts Institute of Technology (MIT)
Alejandro Cruz-Osorio
Johann Wolfgang Goethe Universität Frankfurt am Main
Yuzhu Cui
The Graduate University for Advanced Studies (SOKENDAI)
Shanghai Jiao Tong University
National Astronomical Observatory of Japan
Jordy Davelaar
Columbia University
Flatiron Institute
Radboud Universiteit
Mariafelicia De Laurentis
Johann Wolfgang Goethe Universität Frankfurt am Main
Istituto Nazionale di Fisica Nucleare
Universita degli Studi di Napoli Federico II
Roger Deane
Universiteit van Pretoria
University of Witwatersrand
Rhodes University
Jessica Dempsey
James Clerk Maxwell Telescope
Netherlands Institute for Radio Astronomy (ASTRON)
East Asian Observatory
Gregory Desvignes
Université Paris Descartes
Max-Planck-Gesellschaft
Vedant Dhruv
University of Illinois
Sergio A. Dzib
Institut de Radioastronomie Millimétrique (IRAM)
Max-Planck-Gesellschaft
Ralph P. Eatough
Chinese Academy of Sciences
Max-Planck-Gesellschaft
Razieh Emami
Harvard-Smithsonian Center for Astrophysics
Heino Falcke
Radboud Universiteit
Joseph Farah
Las Cumbres Observatory Global Telescope Network
University of California at Santa Barbara
Vincent L. Fish
Massachusetts Institute of Technology (MIT)
H. Alyson Ford
University of Arizona
Raquel Fraga-Encinas
Radboud Universiteit
William T. Freeman
Google Inc.
Massachusetts Institute of Technology (MIT)
Per Friberg
James Clerk Maxwell Telescope
East Asian Observatory
Christian M. Fromm
Johann Wolfgang Goethe Universität Frankfurt am Main
Julius-Maximilians Universität Würzburg
Max-Planck-Gesellschaft
Antonio Fuentes
Consejo Superior de Investigaciones Científicas (CSIC)
Peter Galison
Harvard University
Roberto Garcia
Institut de Radioastronomie Millimétrique (IRAM)
Olivier Gentaz
Institut de Radioastronomie Millimétrique (IRAM)
Roman Gold
Syddansk Universitet
Johann Wolfgang Goethe Universität Frankfurt am Main
Gomez-Ruiz
Instituto Nacional de Astrofísica, Óptica y Electrońica
Consejo Nacional de Ciencia y Tecnologia Mexico
Jose L. Gomez
Consejo Superior de Investigaciones Científicas (CSIC)
Minfeng Gu
Chinese Academy of Sciences
Kazuhiro Hada
The Graduate University for Advanced Studies (SOKENDAI)
National Astronomical Observatory of Japan
Kari Haworth
Harvard-Smithsonian Center for Astrophysics
Michael H. Hecht
Massachusetts Institute of Technology (MIT)
Ronald Hesper
Rijksuniversiteit Groningen
Luis C. Ho
Beijing University of Technology
Paul Ho
James Clerk Maxwell Telescope
Academia Sinica
Mareki Honma
University of Tokyo
National Astronomical Observatory of Japan
The Graduate University for Advanced Studies (SOKENDAI)
Chih-Wei L. Huang
Academia Sinica
Lei Huang
Chinese Academy of Sciences
David H. Hughes
Instituto Nacional de Astrofísica, Óptica y Electrońica
Shiro Ikeda
National Astronomical Observatory of Japan
University of Tokyo
The Graduate University for Advanced Studies (SOKENDAI)
The Institute of Statistical Mathematics
C. M. Violette Impellizzeri
Universiteit Leiden
National Radio Astronomy Observatory
Makoto Inoue
Academia Sinica
David J. James
ASTRAVEO
Buell T. Jannuzi
University of Arizona
Michael Janssen
Max-Planck-Gesellschaft
Britton Jeter
Academia Sinica
Wu Jiang
Chinese Academy of Sciences
Alejandra Jimenez-Rosales
Radboud Universiteit
Svetlana Jorstad
Boston University
Joshi
University of Illinois
Taehyun Jung
University of Science and Technology (UST)
Korea Astronomy and Space Science Institute
Mansour Karami
Perimeter Institute for Theoretical Physics
University of Waterloo
Ramesh Karuppusamy
Max-Planck-Gesellschaft
Tomohisa Kawashima
University of Tokyo
Mark Kettenis
Joint Institute for VLBI in Europe (JIVE)
Dong-Jin Kim
Max-Planck-Gesellschaft
Jae-Young Kim
Max-Planck-Gesellschaft
Kyungpook National University
Korea Astronomy and Space Science Institute
Jongsoo Kim
Korea Astronomy and Space Science Institute
Junhan Kim
California Institute of Technology (Caltech)
University of Arizona
Motoki Kino
National Astronomical Observatory of Japan
Kogakuin University of Technology and Engineering
Jun Yi Koay
Academia Sinica
Prashant Kocherlakota
Johann Wolfgang Goethe Universität Frankfurt am Main
Yutaro Kofuji
University of Tokyo
National Astronomical Observatory of Japan
Patrick M. Koch
Academia Sinica
Shoko Koyama
Academia Sinica
Niigata University
Carsten Kramer
Institut de Radioastronomie Millimétrique (IRAM)
Michael Kramer
Max-Planck-Gesellschaft
Thomas P. Krichbaum
Max-Planck-Gesellschaft
Cheng-Yu Kuo
Academia Sinica
National Sun Yat-Sen University
Noemi La Bella
Radboud Universiteit
Tod R. Lauer
National Optical Astronomy Observatory
Sang-Sung Lee
Korea Astronomy and Space Science Institute
Po Kin Leung
Chinese University of Hong Kong
Aviad Levis
California Institute of Technology (Caltech)
Zhiyuan Li
Nanjing University
Rocco Lico
Istituto nazionale di astrofisica (INAF)
Consejo Superior de Investigaciones Científicas (CSIC)
Max-Planck-Gesellschaft
Greg Lindahl
Harvard-Smithsonian Center for Astrophysics
Michael Lindqvist
Chalmers, Rymd-, geo- och miljövetenskap, Onsala rymdobservatorium
Mikhail Lisakov
Max-Planck-Gesellschaft
Jun Liu
Max-Planck-Gesellschaft
Kuo Liu
Max-Planck-Gesellschaft
Elisabetta Liuzzo
Istituto nazionale di astrofisica (INAF)
Wen-Ping Lo
National Taiwan University
Academia Sinica
Andrei P. Lobanov
Max-Planck-Gesellschaft
Laurent Loinard
Universidad Nacional Autónoma de México
Colin Lonsdale
Massachusetts Institute of Technology (MIT)
Ru-Sen Lu
Chinese Academy of Sciences
James Clerk Maxwell Telescope
Max-Planck-Gesellschaft
East Asian Observatory
Jirong Mao
Chinese Academy of Sciences
James Clerk Maxwell Telescope
East Asian Observatory
Sera Markoff
Universiteit Van Amsterdam
Alan P. Marscher
Boston University
Satoki Matsushita
Academia Sinica
Lynn D. Matthews
Massachusetts Institute of Technology (MIT)
Lia Medeiros
University of Arizona
Institute for Advanced Study
Karl M. Menten
Max-Planck-Gesellschaft
Daniel Michalik
University of Chicago
European Space Research and Technology Centre (ESA ESTEC)
Izumi Mizuno
East Asian Observatory
James Clerk Maxwell Telescope
Yosuke Mizuno
Johann Wolfgang Goethe Universität Frankfurt am Main
Shanghai Jiao Tong University
James M. Moran
Harvard-Smithsonian Center for Astrophysics
Harvard University
Kotaro Moriyama
Johann Wolfgang Goethe Universität Frankfurt am Main
Massachusetts Institute of Technology (MIT)
National Astronomical Observatory of Japan
Cornelia Mueller
Radboud Universiteit
Max-Planck-Gesellschaft
Gibwa Musoke
Radboud Universiteit
Chinese Academy of Sciences
Ioannis Myserlis
Institut de Radioastronomie Millimétrique (IRAM)
Andrew Nadolski
University of Illinois
Hiroshi Nagai
The Graduate University for Advanced Studies (SOKENDAI)
National Astronomical Observatory of Japan
Neil M. Nagar
Universidad de Concepción
Masanori Nakamura
National Institute of Technology, Hachinohe College
Academia Sinica
Ramesh Narayan
Harvard-Smithsonian Center for Astrophysics
Harvard University
Gopal Narayanan
University of Massachusetts
Iniyan Natarajan
University of Witwatersrand
South African Radio Astronomy Observatory (SARAO)
Antonios Nathanail
Johann Wolfgang Goethe Universität Frankfurt am Main
National and Kapodistrian University of Athens
Santiago Navarro Fuentes
Institut de Radioastronomie Millimétrique (IRAM)
Roberto Neri
Institut de Radioastronomie Millimétrique (IRAM)
Chunchong Ni
University of Waterloo
Perimeter Institute for Theoretical Physics
Aristeidis Noutsos
Max-Planck-Gesellschaft
Junghwan Oh
Sejong University
Hiroki Okino
University of Tokyo
National Astronomical Observatory of Japan
Hector Olivares
Radboud Universiteit
Gisela N. Ortiz-Leon
Universidad Nacional Autónoma de México
Tomoaki Oyama
National Astronomical Observatory of Japan
Feryal Ozel
University of Arizona
Daniel C. M. Palumbo
Harvard University
Harvard-Smithsonian Center for Astrophysics
Georgios Filippos Paraschos
Max-Planck-Gesellschaft
Jongho Park
Academia Sinica
Harriet Parsons
James Clerk Maxwell Telescope
East Asian Observatory
Nimesh Patel
Harvard-Smithsonian Center for Astrophysics
Ue-Li Pen
Canadian Institute for Advanced Research
Academia Sinica
University of Toronto
Perimeter Institute for Theoretical Physics
Dominic W. Pesce
Harvard University
Harvard-Smithsonian Center for Astrophysics
Vincent Pietu
Institut de Radioastronomie Millimétrique (IRAM)
Richard Plambeck
University of California at Berkeley
Aleksandar PopStefanija
University of Massachusetts
Oliver Porth
Chinese Academy of Sciences
Johann Wolfgang Goethe Universität Frankfurt am Main
Felix M. Potzl
Max-Planck-Gesellschaft
University College Cork
Ben Prather
University of Illinois
Jorge A. Preciado-Lopez
Perimeter Institute for Theoretical Physics
Hung-Yi Pu
Academia Sinica
National Taiwan Normal University
Ramprasad Rao
Academia Sinica
Mark G. Rawlings
East Asian Observatory
NSF's National Optical-Infrared Astronomy Research Laboratory (NOIRLab)
James Clerk Maxwell Telescope
Alexander W. Raymond
Harvard University
Harvard-Smithsonian Center for Astrophysics
Luciano Rezzolla
Johann Wolfgang Goethe Universität Frankfurt am Main
Trinity College Dublin
Frankfurt Institute for Advanced Studies
Angelo Ricarte
Harvard-Smithsonian Center for Astrophysics
Harvard University
Freek Roelofs
Radboud Universiteit
Harvard-Smithsonian Center for Astrophysics
Harvard University
Alan Rogers
Massachusetts Institute of Technology (MIT)
Eduardo Ros
Max-Planck-Gesellschaft
Cristina Romero-Canizales
Academia Sinica
Arash Roshanineshat
University of Arizona
Helge Rottmann
Max-Planck-Gesellschaft
Alan L. Roy
Max-Planck-Gesellschaft
Ignacio Ruiz
Institut de Radioastronomie Millimétrique (IRAM)
Chet Ruszczyk
Massachusetts Institute of Technology (MIT)
Kazi L. J. Rygl
Istituto nazionale di astrofisica (INAF)
Salvador Sanchez
Institut de Radioastronomie Millimétrique (IRAM)
David Sanchez-Arguelles
Consejo Nacional de Ciencia y Tecnologia Mexico
Instituto Nacional de Astrofísica, Óptica y Electrońica
Miguel Sanchez-Portal
Institut de Radioastronomie Millimétrique (IRAM)
Mahito Sasada
Hiroshima University
National Astronomical Observatory of Japan
Kaushik Satapathy
University of Arizona
Tuomas Savolainen
Aalto-Yliopisto
Max-Planck-Gesellschaft
F. Peter Schloerb
University of Massachusetts
Karl-Friedrich Schuster
Institut de Radioastronomie Millimétrique (IRAM)
Lijing Shao
Beijing University of Technology
Max-Planck-Gesellschaft
Zhiqiang Shen
East Asian Observatory
Chinese Academy of Sciences
James Clerk Maxwell Telescope
Des Small
Joint Institute for VLBI in Europe (JIVE)
Bong Won Sohn
Korea Astronomy and Space Science Institute
University of Science and Technology (UST)
James Clerk Maxwell Telescope
Yonsei University
East Asian Observatory
Jason SooHoo
Massachusetts Institute of Technology (MIT)
Kamal Souccar
University of Massachusetts
He Sun
California Institute of Technology (Caltech)
Fumie Tazaki
National Astronomical Observatory of Japan
Remo P. J. Tilanus
Nederlandse Organisatie voor Wetenschappelijk Onderzoek (NWO)
University of Arizona
Universiteit Leiden
Radboud Universiteit
Michael Titus
Massachusetts Institute of Technology (MIT)
Pablo Torne
Max-Planck-Gesellschaft
Shanghai Jiao Tong University
Efthalia Traianou
Consejo Superior de Investigaciones Científicas (CSIC)
Max-Planck-Gesellschaft
Tyler Trent
University of Arizona
Sascha Trippe
Seoul National University
James Clerk Maxwell Telescope
East Asian Observatory
Ilse van Bemmel
Joint Institute for VLBI in Europe (JIVE)
Huib Jan van Langevelde
Joint Institute for VLBI in Europe (JIVE)
Universiteit Leiden
University of New Mexico
Daniel R. van Rossum
Radboud Universiteit
Jesse Vos
Radboud Universiteit
Jan Wagner
Max-Planck-Gesellschaft
Derek Ward-Thompson
University of Central Lancashire
John Wardle
Brandeis University
Jonathan Weintroub
Harvard University
Harvard-Smithsonian Center for Astrophysics
Norbert Wex
Max-Planck-Gesellschaft
Robert Wharton
Max-Planck-Gesellschaft
Kaj Wiik
Turun Yliopisto
Michael F. Wondrak
Radboud Universiteit
George N. Wong
Universiteit Van Amsterdam
University College London (UCL)
Qingwen Wu
Huazhong University of Science and Technology
James Clerk Maxwell Telescope
East Asian Observatory
Paul Yamaguchi
Harvard-Smithsonian Center for Astrophysics
Doosoo Yoon
Chinese Academy of Sciences
Andre Young
Radboud Universiteit
Ken Young
Harvard-Smithsonian Center for Astrophysics
Ziri Younsi
Princeton University
Johann Wolfgang Goethe Universität Frankfurt am Main
Feng Yuan
James Clerk Maxwell Telescope
East Asian Observatory
Chinese Academy of Sciences
Ye-Fei Yuan
James Clerk Maxwell Telescope
East Asian Observatory
University of Science and Technology of China
J. Anton Zensus
Max-Planck-Gesellschaft
Shuo Zhang
Bard College
Guang-Yao Zhao
Consejo Superior de Investigaciones Científicas (CSIC)
Shan-Shan Zhao
Chinese Academy of Sciences
Astrophysical Journal Letters
2041-8205 (ISSN) 2041-8213 (eISSN)
Vol. 930 2 L19Ämneskategorier (SSIF 2011)
Astronomi, astrofysik och kosmologi
Atom- och molekylfysik och optik
Annan fysik
DOI
10.3847/2041-8213/ac6428