The giant outburst of 4U 0115+634 in 2011 with Suzaku and RXTE Minimizing cyclotron line biases
| dc.contributor.author | Kühnel, Matthias Bissinger né | |
| dc.contributor.author | Kreykenbohm, Ingo | |
| dc.contributor.author | Ferrigno, Carlo | |
| dc.contributor.author | Pottschmidt, Katja | |
| dc.contributor.author | Marcu-Cheatham, Diana M. | |
| dc.contributor.author | et al | |
| dc.date.accessioned | 2020-02-07T16:11:42Z | |
| dc.date.available | 2020-02-07T16:11:42Z | |
| dc.date.issued | 2020-02-13 | |
| dc.description | Authors: Matthias Bissinger né Kühnel, Ingo Kreykenbohm, Carlo Ferrigno, Katja Pottschmidt, Diana M. Marcu-Cheatham, Felix Fürst, Richard E. Rothschild, Peter Kretschmar, Dmitry Klochkov, Paul Hemphill, Dominik Hertel, Sebastian Müller, Ekaterina Sokolova-Lapa, Bosco Oruru, Victoria Grinberg, Silvia Martínez-Núñez, José M. Torrejón, Peter A. Becker, Michael T. Wolff, Ralf Ballhausen, Fritz-Walter Schwarm and Jörn Wilms | |
| dc.description.abstract | 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 discuss to be due 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 CRSF parameters, which are not consistent with the cyclotron line energies and 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. | en_US |
| dc.description.sponsorship | 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 (MCINN) through the grant ESP2016-76683-C3-1-R and ESP2017-85691-P, respectively. We thank John E. Davis for the development of the SLxfig module, which was used to create all figures in the paper. We thank the anonymous referee for her/his constructive comments on how to improve our paper. | en_US |
| dc.description.uri | https://www.aanda.org/articles/aa/full_html/2020/02/aa35666-19/aa35666-19.html | en_US |
| dc.format.extent | 12 pages | en_US |
| dc.genre | journal articles | en_US |
| dc.identifier | doi:10.13016/m2nnqq-nytz | |
| dc.identifier.citation | Bissinger né Kühnel, M., “The giant outburst of 4U 0115+634 in 2011 with Suzaku and RXTE. Minimizing cyclotron line biases”, Astronomy and Astrophysics, vol. 634, 2020. doi:10.1051/0004-6361/201935666. | en_US |
| dc.identifier.uri | http://hdl.handle.net/11603/17237 | |
| dc.identifier.uri | https://doi.org/10.1051/0004-6361/201935666 | |
| dc.language.iso | en_US | en_US |
| dc.publisher | EDP Sciences | |
| dc.relation.isAvailableAt | The University of Maryland, Baltimore County (UMBC) | |
| dc.relation.ispartof | UMBC Physics Department Collection | |
| dc.relation.ispartof | UMBC Center for Space Sciences and Technology (CSST) / Center for Research and Exploration in Space Sciences & Technology II (CRSST II) | |
| dc.relation.ispartof | UMBC Faculty Collection | |
| dc.rights | Public Domain Mark 1.0 | |
| dc.rights | This work was written as part of one of the author's official duties as an Employee of the United States Government and is therefore a work of the United States Government. In accordance with 17 U.S.C. 105, no copyright protection is available for such works under U.S. Law. | |
| dc.rights.uri | http://creativecommons.org/publicdomain/mark/1.0/ | |
| dc.title | The giant outburst of 4U 0115+634 in 2011 with Suzaku and RXTE Minimizing cyclotron line biases | en_US |
| dc.title.alternative | The giant outburst of 4U 0115+634 in 2011 with Suzaku and RXTE | en_US |
| dc.type | Text | en_US |
| dcterms.creator | https://orcid.org/0000-0002-4656-6881 |