Authors: Sera Markoff; André Young; Charles F. Gammie; Paulo J. V. Garcia; Jason Dexter; Wolfgang Brandner; Giovanni G. Fazio; Julien Woillez; Daniel Stern; Jinyi Shangguan; Eric Gendron; Sebastian Rabien; Patrick Lowrance; Frank Eisenhauer; Thomas Ott; V. Lapeyrère; Reinhard Genzel; Felix Widmann; Feng Gao; A. Drescher; G. Witzel; Pierre Léna; Steven P. Willner; Frederick K. Baganoff; Pierre Kervella; T. Taro Shimizu; Yann Clénet; G. Rodríguez-Coira; H. Bonnet; Joseph L. Hora; S. Zhang; Maryam Habibi; Linda J. Tacconi; Ekkehard Wieprecht; M. Nowak; Dieter Lutz; Karine Perraut; C. J. Hailey; Silvia Scheithauer; A. Jiménez-Rosales; S. D. von Fellenberg; Stefan Gillessen; Ric Davies; N. M. Förster Schreiber; Fiona A. Harrison; Eckhard Sturm; Gérard Zins; Idel Waisberg; G. Ponti; Daryl Haggard; Jean-Phillipe Berger; António Amorim; Y. Dallilar; Mark Gurwell; F. Vincent; P. T. de Zeeuw; Andreas Kaufer; K. Foster; J. Neilsen; Julia Stadler; Guy Perrin; Christian Straubmeier; Erich Wiezorrek; Stefan Hippler; Mark Morris; Gabriele Ghisellini; Lieselotte Jochum; K. Mori; J.-B. Le Bouquin; Roberto Abuter; Oliver Pfuhl; Hope Boyce; S. Yazici; G. Heißel; M. Bauböck; Howard A. Smith; Matthew Horrobin; Andreas Eckart; Odele Straub; Thibaut Paumard; Sylvestre Lacour; Laurent Jocou; Xavier Haubois; Th. Henning

Venue: Astronomy & Astrophysics

Type: Publication

Abstract: We report the time-resolved spectral analysis of a bright near-infrared and moderate X-ray flare of Sgr A⋆. We obtained light curves in theM,K, andHbands in the mid- and near-infrared and in the 2 − 8 keV and 2 − 70 keV bands in the X-ray. The observed spectral slope in the near-infrared band isνLν ∝ ν0.5 ± 0.2; the spectral slope observed in the X-ray band isνLν ∝ ν−0.7 ± 0.5. Using a fast numerical implementation of a synchrotron sphere with a constant radius, magnetic field, and electron density (i.e., a one-zone model), ... (read more)

DOI: 10.48550/arxiv.2107.01096