Broadband Multi-wavelength Properties of M87 during the 2017 Event Horizon Telescope Campaign

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Broadband Multi-wavelength Properties of M87 during the 2017 Event Horizon Telescope Campaign. / (EHT Collaboration).

In: Astrophysical Journal Letters, Vol. 911, No. 1, L11, 01.04.2021.

Research output: Contribution to journal › Review article › peer-review

BibTeX

@article{1552e69c0b6d4def91fc984d55fd09d4,

title = "Broadband Multi-wavelength Properties of M87 during the 2017 Event Horizon Telescope Campaign",

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.",

keywords = "Accretion, Active galactic nuclei, Astrophysical black holes, High energy astrophysics, Low-luminosity active galactic nuclei, Radio cores",

author = "{(EHT Collaboration)} and Algaba, {J. C.} and J. Anczarski and K. Asada and M. Balokovi{\'c} and S. Chandra and Cui, {Y. Z.} and Falcone, {A. D.} and M. Giroletti and C. Goddi and K. Hada and D. Haggard and S. Jorstad and A. Kaur and T. Kawashima and G. Keating and Kim, {J. Y.} and M. Kino and S. Komossa and Kravchenko, {E. V.} and Krichbaum, {T. P.} and Lee, {S. S.} and Lu, {R. S.} and M. Lucchini and S. Markoff and J. Neilsen and Nowak, {M. A.} and J. Park and G. Principe and V. Ramakrishnan and Reynolds, {M. T.} and M. Sasada and Savchenko, {S. S.} and Williamson, {K. E.} and Kazunori Akiyama and Antxon Alberdi and Walter Alef and Richard Anantua and Rebecca Azulay and Baczko, {Anne Kathrin} and David Ball and John Barrett and Dan Bintley and Benson, {Bradford A.} and Lindy Blackburn and V. Doroshenko and Prokhorov, {D. A.} and L. Sun and Zhu, {S. J.} and Y. Chai and E. Molina",

note = "Publisher Copyright: {\textcopyright} 2021. The Author(s). Published by the American Astronomical Society..",

year = "2021",

month = apr,

day = "1",

doi = "10.3847/2041-8213/abef71",

language = "English",

volume = "911",

journal = "Astrophysical Journal Letters",

issn = "2041-8205",

publisher = "IOP Publishing Ltd.",

number = "1",

}

RIS

TY - JOUR

T1 - Broadband Multi-wavelength Properties of M87 during the 2017 Event Horizon Telescope Campaign

AU - (EHT Collaboration)

AU - Algaba, J. C.

AU - Anczarski, J.

AU - Asada, K.

AU - Baloković, M.

AU - Chandra, S.

AU - Cui, Y. Z.

AU - Falcone, A. D.

AU - Giroletti, M.

AU - Goddi, C.

AU - Hada, K.

AU - Haggard, D.

AU - Jorstad, S.

AU - Kaur, A.

AU - Kawashima, T.

AU - Keating, G.

AU - Kim, J. Y.

AU - Kino, M.

AU - Komossa, S.

AU - Kravchenko, E. V.

AU - Krichbaum, T. P.

AU - Lee, S. S.

AU - Lu, R. S.

AU - Lucchini, M.

AU - Markoff, S.

AU - Neilsen, J.

AU - Nowak, M. A.

AU - Park, J.

AU - Principe, G.

AU - Ramakrishnan, V.

AU - Reynolds, M. T.

AU - Sasada, M.

AU - Savchenko, S. S.

AU - Williamson, K. E.

AU - Akiyama, Kazunori

AU - Alberdi, Antxon

AU - Alef, Walter

AU - Anantua, Richard

AU - Azulay, Rebecca

AU - Baczko, Anne Kathrin

AU - Ball, David

AU - Barrett, John

AU - Bintley, Dan

AU - Benson, Bradford A.

AU - Blackburn, Lindy

AU - Doroshenko, V.

AU - Prokhorov, D. A.

AU - Sun, L.

AU - Zhu, S. J.

AU - Chai, Y.

AU - Molina, E.

PY - 2021/4/1

Y1 - 2021/4/1

N2 - 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.

AB - 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.

KW - Accretion

KW - Active galactic nuclei

KW - Astrophysical black holes

KW - High energy astrophysics

KW - Low-luminosity active galactic nuclei

KW - Radio cores

UR - http://www.scopus.com/inward/record.url?scp=85105584477&partnerID=8YFLogxK

UR - https://www.mendeley.com/catalogue/f5077b9d-4797-3578-ad31-2ef99771bd32/

U2 - 10.3847/2041-8213/abef71

DO - 10.3847/2041-8213/abef71

M3 - Review article

AN - SCOPUS:85105584477

VL - 911

JO - Astrophysical Journal Letters

JF - Astrophysical Journal Letters

SN - 2041-8205

IS - 1

M1 - L11

ER -

ID: 85052170