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dc.contributor.author Pepe, Carolina
dc.contributor.author Vila, Gabriela Soledad
dc.contributor.author Romero, Gustavo Esteban
dc.date.available 2016-08-08T14:39:00Z
dc.date.issued 2015-12
dc.identifier.citation Pepe, Carolina; Vila, Gabriela Soledad; Romero, Gustavo Esteban; Lepto-hadronic model for the broadband emission of Cygnus X-1; EDP Sciences; Astronomy And Astrophysics; 584; 95; 12-2015; 1-11
dc.identifier.issn 0004-6361
dc.identifier.uri http://hdl.handle.net/11336/6977
dc.description.abstract Context. Cygnus X-1 is a well-observed microquasar. Broadband observations at all wavelengths have been collected over the years.The origin of the MeV tail observed with COMPTEL and INTEGRAL is still under debate and it has mostly been attributed to thecorona, although its high degree of polarization suggests that it is synchrotron radiation from a jet. The origin of the transient emissionabove ∼100 GeV is also unclear.Aims. We aim to clarify the origin of the broadband spectral energy distribution (SED) of Cygnus X-1, focusing particularly on thegamma-ray emission, and to gain information on the physical conditions inside the jets.Methods. We developed a lepto-hadronic, inhomogeneous jet model and applied it to the non-thermal SED of Cygnus X-1. Wecalculated the contributions to the SED of both protons and electrons accelerated in an extended region of the jet. We also estimatedthe radiation of charged secondaries produced in hadronic interactions through several radiative processes. Absorption effects wereconsidered. We produced synthetic maps of the jets at radio wavelengths.Results. We find two sets of model parameters that lead to good fits of the SED. One of the models fits all the observations, includingthe MeV tail. This model also predicts hadronic gamma-ray emission slightly below the current upper limits. The flux predicted at8.4 GHz is in agreement with the observations available in the literature, although the synthetic source is more compact than theimaged radio jet.Conclusions. Our results show that the MeV emission in Cygnus X-1 may be jet synchrotron radiation. This depends mainly on thestrength of the jet magnetic field and the location of the injection region of the relativistic particles. Our calculations show that theremust be energetic electrons in the jets quite far from the black hole.
dc.format application/pdf
dc.language.iso eng
dc.publisher EDP Sciences
dc.rights info:eu-repo/semantics/embargoedAccess
dc.rights.uri https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
dc.subject Gamma rays
dc.subject Nonthermal mechanisms
dc.subject X-ray binaries
dc.subject Cygnus X-1 (microquasar)
dc.subject Microquasars
dc.subject.classification Astronomía
dc.subject.classification Ciencias Físicas
dc.subject.classification CIENCIAS NATURALES Y EXACTAS
dc.title Lepto-hadronic model for the broadband emission of Cygnus X-1
dc.type info:eu-repo/semantics/article
dc.type info:ar-repo/semantics/artículo
dc.type info:eu-repo/semantics/publishedVersion
dc.date.updated 2016-07-26T15:12:42Z
dc.journal.volume 584
dc.journal.number 95
dc.journal.pagination 1-11
dc.journal.pais Francia
dc.journal.ciudad Paris
dc.description.fil Fil: Pepe, Carolina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico la Plata. Instituto Argentino de Radioastronomia (i); Argentina
dc.description.fil Fil: Vila, Gabriela Soledad. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico la Plata. Instituto Argentino de Radioastronomia (i); Argentina
dc.description.fil Fil: Romero, Gustavo Esteban. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico la Plata. Instituto Argentino de Radioastronomia (i); Argentina. Universidad Nacional de la Plata. Facultad de Ciencias Astronómicas y Geofísicas; Argentina
dc.journal.title Astronomy And Astrophysics
dc.rights.embargoDate 2016-12-30
dc.relation.alternativeid info:eu-repo/semantics/altIdentifier/url/http://www.aanda.org/articles/aa/abs/2015/12/aa27156-15/aa27156-15.html
dc.relation.alternativeid info:eu-repo/semantics/altIdentifier/doi/http://dx.doi.org/10.1051/0004-6361/201527156
dc.relation.alternativeid info:eu-repo/semantics/altIdentifier/doi/10.1051/0004-6361/201527156


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info:eu-repo/semantics/embargoedAccess Excepto donde se diga explícitamente, este item se publica bajo la siguiente descripción: Creative Commons Attribution-NonCommercial-ShareAlike 2.5 Unported (CC BY-NC-SA 2.5)