The giant outburst of 4U 0115+634 in 2011 with Suzaku and RXTE - Minimizing cyclotron line biases
| Autor: | Jose M. Torrejon, Ralf Ballhausen, Victoria Grinberg, Felix Fürst, Richard E. Rothschild, Bosco Oruru, Paul Hemphill, Carlo Ferrigno, Diana M. Marcu-Cheatham, Dominik Hertel, S. Martínez-Núñez, Katja Pottschmidt, Fritz-Walter Schwarm, Peter Kretschmar, Peter A. Becker, I. Kreykenbohm, Michael T. Wolff, Matthias Kühnel, Dmitry Klochkov, Ekaterina Sokolova-Lapa, Sebastian Müller, Jörn Wilms |
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| Přispěvatelé: | Universidad de Alicante. Departamento de Física, Ingeniería de Sistemas y Teoría de la Señal, Universidad de Alicante. Instituto Universitario de Física Aplicada a las Ciencias y las Tecnologías, Astronomía y Astrofísica |
| Jazyk: | angličtina |
| Rok vydání: | 2020 |
| Předmět: |
Physics
Accretion (meteorology) 010308 nuclear & particles physics individual: 4U 0115+634 [Pulsars] Astrophysics::High Energy Astrophysical Phenomena Continuum (design consultancy) Cyclotron Flux Astronomy and Astrophysics Astrophysics Accretion accretion disks 01 natural sciences Power law Spectral line law.invention Space and Planetary Science law Magnetic fields Física Aplicada 0103 physical sciences binaries [X-rays] Emission spectrum 010303 astronomy & astrophysics Line (formation) |
| Zdroj: | RUA. Repositorio Institucional de la Universidad de Alicante Universidad de Alicante (UA) |
| Popis: | We present an analysis of X-ray spectra of the high-mass X-ray binary 4U 0115+634 as observed with Suzaku and RXTE in 2011 July, during the fading phase of a giant X-ray outburst. We used a continuum model consisting of an absorbed cutoff power law and an ad hoc Gaussian emission feature centered around 8.5 keV, which we attribute to cyclotron emission. Our results are consistent with a fundamental cyclotron absorption line centered at ∼10.2 keV for all observed flux ranges. At the same time we rule out significant influence of the 8.5 kev Gaussian on the parameters of the cyclotron resonant scattering feature, which are not consistent with the cyclotron line energies or the depths of previously reported flux-dependent descriptions. We also show that some continuum models can lead to artificial line-like residuals in the analyzed spectra, which are then misinterpreted as unphysically strong cyclotron lines. Specifically, our results do not support the existence of a previously claimed additional cyclotron feature at ∼15 keV. Apart from these features, we find for the first time evidence for a He-like Fe XXV emission line at ∼6.7 keV and weak H-like Fe XXVI emission close to ∼7.0 keV. We acknowledge funding by the European Space Agency under contract number C4000115860/15/NL/IB, by the Bundesministerium für Wirtschaft und Technologie under Deutsches Zentrum für Luft- und Raumfahrt grants 50OR0808, 50OR0905, 50OR1113, and 50OR1207, and by the Deutscher Akademischer Austauschdienst. MTW is supported by the NASA Astrophysical Data Analysis Program and the Chief of Naval Research. VG is supported through the Margarethe von Wrangell fellowship by the ESF and the Ministry of Science, Research and the Arts Baden-Württemberg. SMN and JMT acknowledge Spanish Ministerio de Ciencia, Tecnología e Innovación (MICINN) through the grant ESP2016-76683-C3-1-R and ESP2017-85691-P, respectively. |
| Databáze: | OpenAIRE |
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