The Eta Carinae 2020 periastron passage as seen by H.E.S.S.

H.E.S.S. Collaboration

The Eta Carinae 2020 periastron passage as seen by H.E.S.S.

H.E.S.S. Collaboration

Max-Planck-Institut für Kernphysik
Université Paris-Saclay
Dublin Institute for Advanced Studies
Yerevan State University
Landessternwarte Heidelberg
University of Groningen
University of Namibia
North-West University
Universität Hamburg
c/o DESY
Jagiellonian University
University of the Free State
University of Potsdam
Astroparticule and Cosmol APC
Linnaeus University, Växjö
University of the Witwatersrand, Johannesburg
University of Tübingen
LUTH - Laboratoire de l'Univers et de ses Theories
Sorbonne Université
Humboldt-Universität zu Berlin
University of Oxford
Friedrich-Alexander University (FAU) Erlangen-Nürnberg and Universitätsklinikum Erlangen
University of Warsaw
Université Savoie Mont Blanc
Institute for Nuclear Physics
UMR 5797
University of Adelaide
Laboratoire Univers et Particules de Montpellier
Aix-Marseille Université
Ip Paris
University of Innsbruck
Nicolaus Copernicus University
Rikkyo University
Nicolaus Copernicus Astronomical Center of the Polish Academy of Sciences
University of Leicester
University of Amsterdam
Yerevan Physics Institute
Konan University
University of Tokyo
Riken

Résultats de recherche: Contribution à un journal › Article de conférence › Revue par des pairs

Résumé

The binary system Eta Carinae is a unique laboratory to study particle acceleration up to very high energies (VHE) under a wide range of conditions. Particles are thought to be accelerated at shocks forming in the wind collision region. Eta Carinae has been firmly established as a source of high energy gamma-rays in Fermi-LAT data over several orbits. With its highly eccentric orbit lasting 5.5 years, the periastron passage of the two stars is extremely close. This provides an opportunity to constrain the acceleration and absorption mechanisms of the system. Eta Carinae was detected above 200 GeV by the H.E.S.S. telescopes (H.E.S.S. Collaboration, 2020) based on data before and after the 2014 periastron. Unfortunately the 2014 periastron itself could not be observed by H.E.S.S. due to visibility constraints. Hence the 2020 periastron was the first periastron passage visible for the full 5 telescope H.E.S.S. array and was therefore monitored with an extensive observation campaign spanning the phase range from 0.97 to 1.05. We report the detection of a VHE signal from Eta Carinae during the 2020 periastron and describe its spectral properties together with simultaneous Fermi-LAT data. Together with previous and follow up observations, for the first time a VHE light curve spanning a full orbit is presented.

langue originale	Anglais
Numéro d'article	640
journal	Proceedings of Science
Volume	444
état	Publié - 27 sept. 2024
Evénement	38th International Cosmic Ray Conference, ICRC 2023 - Nagoya, Japon Durée: 26 juil. 2023 → 3 août 2023

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@article{184a60cf55964db3a16b8d0cf7c5746b,

title = "The Eta Carinae 2020 periastron passage as seen by H.E.S.S.",

abstract = "The binary system Eta Carinae is a unique laboratory to study particle acceleration up to very high energies (VHE) under a wide range of conditions. Particles are thought to be accelerated at shocks forming in the wind collision region. Eta Carinae has been firmly established as a source of high energy gamma-rays in Fermi-LAT data over several orbits. With its highly eccentric orbit lasting 5.5 years, the periastron passage of the two stars is extremely close. This provides an opportunity to constrain the acceleration and absorption mechanisms of the system. Eta Carinae was detected above 200 GeV by the H.E.S.S. telescopes (H.E.S.S. Collaboration, 2020) based on data before and after the 2014 periastron. Unfortunately the 2014 periastron itself could not be observed by H.E.S.S. due to visibility constraints. Hence the 2020 periastron was the first periastron passage visible for the full 5 telescope H.E.S.S. array and was therefore monitored with an extensive observation campaign spanning the phase range from 0.97 to 1.05. We report the detection of a VHE signal from Eta Carinae during the 2020 periastron and describe its spectral properties together with simultaneous Fermi-LAT data. Together with previous and follow up observations, for the first time a VHE light curve spanning a full orbit is presented.",

author = "\{H.E.S.S. Collaboration\} and Simon Steinmassl and Vincent Marandon and Quentin Remy and Jim Hinton and F. Aharonian and \{Ait Benkhali\}, F. and A. Alkan and J. Aschersleben and H. Ashkar and M. Backes and A. Baktash and \{Barbosa Martins\}, V. and A. Barnacka and J. Barnard and R. Batzofin and Y. Becherini and G. Beck and D. Berge and K. Bernl{\"o}hr and B. Bi and M. B{\"o}ttcher and C. Boisson and J. Bolmont and \{de Bony de Lavergne\}, M. and J. Borowska and M. Bouyahiaoui and F. Bradascio and M. Breuhaus and R. Brose and A. Brown and F. Brun and B. Bruno and T. Bulik and C. Burger-Scheidlin and T. Bylund and F. Cangemi and S. Caroff and S. Casanova and R. Cecil and J. Celic and M. Cerruti and P. Chambery and T. Chand and S. Chandra and A. Chen and J. Chibueze and O. Chibueze and T. Collins and G. Cotter and S. Fegan",

note = "Publisher Copyright: {\textcopyright} Copyright owned by the author(s) under the terms of the Creative Commons.; 38th International Cosmic Ray Conference, ICRC 2023 ; Conference date: 26-07-2023 Through 03-08-2023",

year = "2024",

month = sep,

day = "27",

language = "English",

volume = "444",

journal = "Proceedings of Science",

issn = "1824-8039",

}

TY - JOUR

T1 - The Eta Carinae 2020 periastron passage as seen by H.E.S.S.

AU - H.E.S.S. Collaboration

AU - Steinmassl, Simon

AU - Marandon, Vincent

AU - Remy, Quentin

AU - Hinton, Jim

AU - Aharonian, F.

AU - Ait Benkhali, F.

AU - Alkan, A.

AU - Aschersleben, J.

AU - Ashkar, H.

AU - Backes, M.

AU - Baktash, A.

AU - Barbosa Martins, V.

AU - Barnacka, A.

AU - Barnard, J.

AU - Batzofin, R.

AU - Becherini, Y.

AU - Beck, G.

AU - Berge, D.

AU - Bernlöhr, K.

AU - Bi, B.

AU - Böttcher, M.

AU - Boisson, C.

AU - Bolmont, J.

AU - de Bony de Lavergne, M.

AU - Borowska, J.

AU - Bouyahiaoui, M.

AU - Bradascio, F.

AU - Breuhaus, M.

AU - Brose, R.

AU - Brown, A.

AU - Brun, F.

AU - Bruno, B.

AU - Bulik, T.

AU - Burger-Scheidlin, C.

AU - Bylund, T.

AU - Cangemi, F.

AU - Caroff, S.

AU - Casanova, S.

AU - Cecil, R.

AU - Celic, J.

AU - Cerruti, M.

AU - Chambery, P.

AU - Chand, T.

AU - Chandra, S.

AU - Chen, A.

AU - Chibueze, J.

AU - Chibueze, O.

AU - Collins, T.

AU - Cotter, G.

AU - Fegan, S.

PY - 2024/9/27

Y1 - 2024/9/27

N2 - The binary system Eta Carinae is a unique laboratory to study particle acceleration up to very high energies (VHE) under a wide range of conditions. Particles are thought to be accelerated at shocks forming in the wind collision region. Eta Carinae has been firmly established as a source of high energy gamma-rays in Fermi-LAT data over several orbits. With its highly eccentric orbit lasting 5.5 years, the periastron passage of the two stars is extremely close. This provides an opportunity to constrain the acceleration and absorption mechanisms of the system. Eta Carinae was detected above 200 GeV by the H.E.S.S. telescopes (H.E.S.S. Collaboration, 2020) based on data before and after the 2014 periastron. Unfortunately the 2014 periastron itself could not be observed by H.E.S.S. due to visibility constraints. Hence the 2020 periastron was the first periastron passage visible for the full 5 telescope H.E.S.S. array and was therefore monitored with an extensive observation campaign spanning the phase range from 0.97 to 1.05. We report the detection of a VHE signal from Eta Carinae during the 2020 periastron and describe its spectral properties together with simultaneous Fermi-LAT data. Together with previous and follow up observations, for the first time a VHE light curve spanning a full orbit is presented.

AB - The binary system Eta Carinae is a unique laboratory to study particle acceleration up to very high energies (VHE) under a wide range of conditions. Particles are thought to be accelerated at shocks forming in the wind collision region. Eta Carinae has been firmly established as a source of high energy gamma-rays in Fermi-LAT data over several orbits. With its highly eccentric orbit lasting 5.5 years, the periastron passage of the two stars is extremely close. This provides an opportunity to constrain the acceleration and absorption mechanisms of the system. Eta Carinae was detected above 200 GeV by the H.E.S.S. telescopes (H.E.S.S. Collaboration, 2020) based on data before and after the 2014 periastron. Unfortunately the 2014 periastron itself could not be observed by H.E.S.S. due to visibility constraints. Hence the 2020 periastron was the first periastron passage visible for the full 5 telescope H.E.S.S. array and was therefore monitored with an extensive observation campaign spanning the phase range from 0.97 to 1.05. We report the detection of a VHE signal from Eta Carinae during the 2020 periastron and describe its spectral properties together with simultaneous Fermi-LAT data. Together with previous and follow up observations, for the first time a VHE light curve spanning a full orbit is presented.

M3 - Conference article

AN - SCOPUS:85185588545

SN - 1824-8039

VL - 444

JO - Proceedings of Science

JF - Proceedings of Science

M1 - 640

T2 - 38th International Cosmic Ray Conference, ICRC 2023

Y2 - 26 July 2023 through 3 August 2023

ER -

The Eta Carinae 2020 periastron passage as seen by H.E.S.S.

Résumé

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