Probing the magnetic field in the GW170817 outflow using H.E.S.S. observations
Abstract
The detection of the first electromagnetic counterpart to the binary neutron star (BNS) merger remnant GW170817 established the connection between short -ray bursts and BNS mergers. It also confirmed the forging of heavy elements in the ejecta (a so-called kilonova) via the r-process nucleosynthesis. The appearance of non-thermal radio and X-ray emission, as well as the brightening, which lasted more than 100 days, were somewhat unexpected. Current theoretical models attempt to explain this temporal behavior as either originating from a relativistic off-axis jet or a kilonova-like outflow. In either scenario, there is some ambiguity regarding how much energy is transported in the non-thermal electrons versus the magnetic field of the emission region. Combining the VLA (radio) and Chandra (X-ray) measurements with observations in the GeV-TeV domain can help break this ambiguity, almost independently of the assumed origin of the emission. Here we report for the first time on deep H.E.S.S. observations of GW170817 / GRB 170817A between 124 and 272 days after the BNS merger with the full H.E.S.S. array of telescopes, as well as on an updated analysis of the prompt (<5 days) observations with the upgraded H.E.S.S. phase-I telescopes. We discuss implications of the H.E.S.S. measurement for the magnetic field in the context of different source scenarios.
Keywords
Cite
@article{arxiv.2004.10105,
title = {Probing the magnetic field in the GW170817 outflow using H.E.S.S. observations},
author = {H. E. S. S. Collaboration and : and H. Abdalla and R. Adam and F. Aharonian and F. Ait Benkhali and E. O. Angüner and M. Arakawa and C. Arcaro and C. Armand and T. Armstrong and H. Ashkar and M. Backes and V. Baghmanyan and V. Barbosa-Martins and A. Barnacka and M. Barnard and Y. Becherini and D. Berge and K. Bernlöhr and R. Blackwell and M. Böttcher and C. Boisson and J. Bolmont and S. Bonnefoy and J. Bregeon and M. Breuhaus and F. Brun and P. Brun and M. Bryan and M. Büchele and T. Bulik and T. Bylund and S. Caroff and A. Carosi and S. Casanova and M. Cerruti and T. Chand and S. Chandra and A. Chen and G. Cotter and M. Curyło and I. D. Davids and J. Davies and C. Deil and J. Devin and P. deWilt and L. Dirson and A. Djannati-Ataï and A. Dmytriiev and A. Donath and V. Doroshenko and J. Dyks and K. Egberts and F. Eichhorn and G. Emery and J. -P. Ernenwein and S. Eschbach and K. Feijen and S. Fegan and A. Fiasson and G. Fontaine and S. Funk and M. Füßling and S. Gabici and Y. A. Gallant and G. Giavitto and L. Giunti and D. Glawion and J. F. Glicenstein and D. Gottschall and M. -H. Grondin and J. Hahn and M. Haupt and G. Heinzelmann and G. Hermann and J. A. Hinton and W. Hofmann and C. Hoischen and T. L. Holch and M. Holler and M. Hörbe and D. Horns and D. Huber and H. Iwasaki and M. Jamrozy and D. Jankowsky and F. Jankowsky and A. Jardin-Blicq and V. Joshi and I. Jung-Richardt and M. A. Kastendieck and K. Katarzyński and M. Katsuragawa and U. Katz and D. Khangulyan and B. Khélifi and S. Klepser and W. Kluźniak and Nu. Komin and R. Konno and K. Kosack and D. Kostunin and M. Kreter and G. Lamanna and A. Lemière and M. Lemoine-Goumard and J. -P. Lenain and E. Leser and C. Levy and T. Lohse and I. Lypova and J. Mackey and J. Majumdar and D. Malyshev and D. Malyshev and V. Marandon and P. Marchegiani and A. Marcowith and A. Mares and G. Martí-Devesa and R. Marx and G. Maurin and P. J. Meintjes and R. Moderski and M. Mohamed and L. Mohrmann and C. Moore and P. Morris and E. Moulin and J. Muller and T. Murach and S. Nakashima and K. Nakashima and M. de Naurois and H. Ndiyavala and F. Niederwanger and J. Niemiec and L. Oakes and P. O'Brien and H. Odaka and S. Ohm and E. de Ona Wilhelmi and M. Ostrowski and M. Panter and R. D. Parsons and B. Peyaud and Q. Piel and S. Pita and V. Poireau and A. Priyana Noel and D. A. Prokhorov and H. Prokoph and G. Pühlhofer and M. Punch and A. Quirrenbach and S. Raab and R. Rauth and A. Reimer and O. Reimer and Q. Remy and M. Renaud and F. Rieger and L. Rinchiuso and C. Romoli and G. Rowell and B. Rudak and E. Ruiz-Velasco and V. Sahakian and S. Sailer and S. Saito and D. A. Sanchez and A. Santangelo and M. Sasaki and M. Scalici and R. Schlickeiser and F. Schüssler and A. Schulz and H. Schutte and U. Schwanke and S. Schwemmer and M. Seglar-Arroyo and M. Senniappan and A. S. Seyffert and N. Shafi and K. Shiningayamwe and R. Simoni and A. Sinha and H. Sol and A. Specovius and S. Spencer and M. Spir-Jacob and Ł. Stawarz and R. Steenkamp and C. Stegmann and C. Steppa and T. Takahashi and T. Tavernier and A. M. Taylor and R. Terrier and D. Tiziani and M. Tluczykont and L. Tomankova and C. Trichard and M. Tsirou and N. Tsuji and R. Tuffs and Y. Uchiyama and D. J. van der Walt and C. van Eldik and C. van Rensburg and B. van Soelen and G. Vasileiadis and J. Veh and C. Venter and P. Vincent and J. Vink and H. J. Völk and T. Vuillaume and Z. Wadiasingh and S. J. Wagner and J. Watson and F. Werner and R. White and A. Wierzcholska and R. Yang and H. Yoneda and M. Zacharias and R. Zanin and A. A. Zdziarski and A. Zech and J. Zorn and N. Zywucka and X. Rodrigues},
journal= {arXiv preprint arXiv:2004.10105},
year = {2020}
}
Comments
7 pages, 2 figures, 1 table