Modeling the polarization of high-energy radiation from accreting black holes : A case study of XTE J1118+480

Context. The high-energy emission (400 keV-2 MeV) of Cygnus X-1, which is the best-studied Galactic black hole, was recently found to be strongly polarized. The origin of this radiation is still unknown. Aims. We suggest that the emission is the result of non-thermal processes in the hot corona ar...

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Autores principales: Vieyro, Florencia Laura, Romero, Gustavo Esteban, Chaty, S.
Formato: Articulo
Lenguaje:Inglés
Publicado: 2016
Materias:
Ciencias Astronómicas
gamma rays: general
polarization
stars: individual: XTE J1118+480
X-rays: binaries
Acceso en línea:http://sedici.unlp.edu.ar/handle/10915/86658
Aporte de:
SEDICI (UNLP) de Universidad Nacional de La Plata
id I19-R120-10915-86658
record_format dspace
institution Universidad Nacional de La Plata
institution_str I-19
repository_str R-120
collection SEDICI (UNLP)
language Inglés
topic Ciencias Astronómicas
gamma rays: general
polarization
stars: individual: XTE J1118+480
X-rays: binaries
spellingShingle Ciencias Astronómicas
gamma rays: general
polarization
stars: individual: XTE J1118+480
X-rays: binaries
Vieyro, Florencia Laura
Romero, Gustavo Esteban
Chaty, S.
Modeling the polarization of high-energy radiation from accreting black holes : A case study of XTE J1118+480
topic_facet Ciencias Astronómicas
gamma rays: general
polarization
stars: individual: XTE J1118+480
X-rays: binaries
description Context. The high-energy emission (400 keV-2 MeV) of Cygnus X-1, which is the best-studied Galactic black hole, was recently found to be strongly polarized. The origin of this radiation is still unknown. Aims. We suggest that the emission is the result of non-thermal processes in the hot corona around the accreting compact object and study the polarization of high-energy radiation that is expected for black hole binaries. Methods. Two contributions to the total magnetic field were taken into account in our study: a small-scale random component related to the corona, and an ordered magnetic field associated with the accretion disk. The degree of polarization of gamma-ray emission for this particular geometry was estimated together with the angle of the polarization vector. Results. We obtain that the configuration of corona plus disk can account for the high degree of polarization of gamma-rays that are detected in galactic black holes and does not need to invoke a relativistic jet. We make specific predictions for sources in a low-hard state. In particular, the model is applied to the transient source XTE J1118+480. We show that if a new outburst of XTE J1118+480 is observed, then its gamma-ray polarization should be measurable by future instruments, such as ASTRO-H or the proposed ASTROGAM.
format Articulo
Articulo
author Vieyro, Florencia Laura
Romero, Gustavo Esteban
Chaty, S.
author_facet Vieyro, Florencia Laura
Romero, Gustavo Esteban
Chaty, S.
author_sort Vieyro, Florencia Laura
title Modeling the polarization of high-energy radiation from accreting black holes : A case study of XTE J1118+480
title_short Modeling the polarization of high-energy radiation from accreting black holes : A case study of XTE J1118+480
title_full Modeling the polarization of high-energy radiation from accreting black holes : A case study of XTE J1118+480
title_fullStr Modeling the polarization of high-energy radiation from accreting black holes : A case study of XTE J1118+480
title_full_unstemmed Modeling the polarization of high-energy radiation from accreting black holes : A case study of XTE J1118+480
title_sort modeling the polarization of high-energy radiation from accreting black holes : a case study of xte j1118+480
publishDate 2016
url http://sedici.unlp.edu.ar/handle/10915/86658
work_keys_str_mv AT vieyroflorencialaura modelingthepolarizationofhighenergyradiationfromaccretingblackholesacasestudyofxtej1118480
AT romerogustavoesteban modelingthepolarizationofhighenergyradiationfromaccretingblackholesacasestudyofxtej1118480
AT chatys modelingthepolarizationofhighenergyradiationfromaccretingblackholesacasestudyofxtej1118480
bdutipo_str Repositorios
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