Relativistic X-ray reflection and photoionized absorption in the neutron star low-mass X-ray binary GX 13+1

Autores
Saavedra, Enzo Agustin; García, Federico; Fogantini, Federico Adrián; Méndez, Mariano; Combi, Jorge Ariel; Luque Escamilla, Pedro L.; Martí, Josep
Año de publicación
2023
Idioma
inglés
Tipo de recurso
artículo
Estado
versión publicada
Descripción
We analysed a dedicated NuSTAR observation of the neutron-star low-mass X-ray binary Z-source GX 13+1 to study the timing and spectral properties of the source. From the colour-colour diagram, we conclude that during that observation the source transitioned from the normal branch to the flaring branch. We fitted the spectra of the source in each branch with a model consisting of an accretion disc, a Comptonised blackbody, relativistic reflection (relxillNS), and photo-ionised absorption (warmabs). Thanks to the combination of the large effective area and good energy resolution of NuSTAR at high energies, we found evidence of relativistic reflection in both the Fe K line profile, and the Compton hump present in the 10-25 keV energy range. The inner disc radius is Rin ≲ 9.6 rg, which allowed us to further constrain the magnetic field strength to B ≲ 1.8 × 108 G. We also found evidence for the presence of a hot wind leading to photo-ionised absorption of Fe and Ni, with a Ni overabundance of ~6 times solar. From the spectral fits, we find that the distance between the ionising source and the slab of ionised absorbing material is ~4 - 40 × 105 km. We also found that the width of the boundary layer extends ~3 km above the surface of a neutron star, which yielded a neutron-star radius RNS ≲ 16 km. The scenario inferred from the spectral modelling becomes self-consistent only for high electron densities in the accretion disk, ne ~ 1022 - 1023 cm-3, as expected for a Shakura-Sunyaev disc, and significantly above the densities provided by relxillNS models. These results have implications for our understanding of the physical conditions in GX 13+1.
Fil: Saavedra, Enzo Agustin. Universidad Nacional de La Plata. Facultad de Ciencias Astronómicas y Geofísicas; Argentina. Provincia de Buenos Aires. Gobernación. Comisión de Investigaciones Científicas. Instituto Argentino de Radioastronomía. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata. Instituto Argentino de Radioastronomía; Argentina
Fil: García, Federico. Provincia de Buenos Aires. Gobernación. Comisión de Investigaciones Científicas. Instituto Argentino de Radioastronomía. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata. Instituto Argentino de Radioastronomía; Argentina
Fil: Fogantini, Federico Adrián. Provincia de Buenos Aires. Gobernación. Comisión de Investigaciones Científicas. Instituto Argentino de Radioastronomía. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata. Instituto Argentino de Radioastronomía; Argentina
Fil: Méndez, Mariano. Kapteyn Astronomical Institute; Países Bajos
Fil: Combi, Jorge Ariel. Provincia de Buenos Aires. Gobernación. Comisión de Investigaciones Científicas. Instituto Argentino de Radioastronomía. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata. Instituto Argentino de Radioastronomía; Argentina
Fil: Luque Escamilla, Pedro L.. Universidad de Jaén; España
Fil: Martí, Josep. Universidad de Jaén; España
Materia
ACCRETION
ACCRETION DISKS
STARS: NEUTRON
STARS: INDIVIDUAL (GX 13+1)
Nivel de accesibilidad
acceso abierto
Condiciones de uso
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
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CONICET Digital (CONICET)
Institución
Consejo Nacional de Investigaciones Científicas y Técnicas
OAI Identificador
oai:ri.conicet.gov.ar:11336/217978
Acceder
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network_name_str CONICET Digital (CONICET)
spelling Relativistic X-ray reflection and photoionized absorption in the neutron star low-mass X-ray binary GX 13+1Saavedra, Enzo AgustinGarcía, FedericoFogantini, Federico AdriánMéndez, MarianoCombi, Jorge ArielLuque Escamilla, Pedro L.Martí, JosepACCRETIONACCRETION DISKSSTARS: NEUTRONSTARS: INDIVIDUAL (GX 13+1)https://purl.org/becyt/ford/1.3https://purl.org/becyt/ford/1We analysed a dedicated NuSTAR observation of the neutron-star low-mass X-ray binary Z-source GX 13+1 to study the timing and spectral properties of the source. From the colour-colour diagram, we conclude that during that observation the source transitioned from the normal branch to the flaring branch. We fitted the spectra of the source in each branch with a model consisting of an accretion disc, a Comptonised blackbody, relativistic reflection (relxillNS), and photo-ionised absorption (warmabs). Thanks to the combination of the large effective area and good energy resolution of NuSTAR at high energies, we found evidence of relativistic reflection in both the Fe K line profile, and the Compton hump present in the 10-25 keV energy range. The inner disc radius is Rin ≲ 9.6 rg, which allowed us to further constrain the magnetic field strength to B ≲ 1.8 × 108 G. We also found evidence for the presence of a hot wind leading to photo-ionised absorption of Fe and Ni, with a Ni overabundance of ~6 times solar. From the spectral fits, we find that the distance between the ionising source and the slab of ionised absorbing material is ~4 - 40 × 105 km. We also found that the width of the boundary layer extends ~3 km above the surface of a neutron star, which yielded a neutron-star radius RNS ≲ 16 km. The scenario inferred from the spectral modelling becomes self-consistent only for high electron densities in the accretion disk, ne ~ 1022 - 1023 cm-3, as expected for a Shakura-Sunyaev disc, and significantly above the densities provided by relxillNS models. These results have implications for our understanding of the physical conditions in GX 13+1.Fil: Saavedra, Enzo Agustin. Universidad Nacional de La Plata. Facultad de Ciencias Astronómicas y Geofísicas; Argentina. Provincia de Buenos Aires. Gobernación. Comisión de Investigaciones Científicas. Instituto Argentino de Radioastronomía. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata. Instituto Argentino de Radioastronomía; ArgentinaFil: García, Federico. Provincia de Buenos Aires. Gobernación. Comisión de Investigaciones Científicas. Instituto Argentino de Radioastronomía. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata. Instituto Argentino de Radioastronomía; ArgentinaFil: Fogantini, Federico Adrián. Provincia de Buenos Aires. Gobernación. Comisión de Investigaciones Científicas. Instituto Argentino de Radioastronomía. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata. Instituto Argentino de Radioastronomía; ArgentinaFil: Méndez, Mariano. Kapteyn Astronomical Institute; Países BajosFil: Combi, Jorge Ariel. Provincia de Buenos Aires. Gobernación. Comisión de Investigaciones Científicas. Instituto Argentino de Radioastronomía. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata. Instituto Argentino de Radioastronomía; ArgentinaFil: Luque Escamilla, Pedro L.. Universidad de Jaén; EspañaFil: Martí, Josep. Universidad de Jaén; EspañaWiley Blackwell Publishing, Inc2023-07info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionhttp://purl.org/coar/resource_type/c_6501info:ar-repo/semantics/articuloapplication/pdfapplication/pdfhttp://hdl.handle.net/11336/217978Saavedra, Enzo Agustin; García, Federico; Fogantini, Federico Adrián; Méndez, Mariano; Combi, Jorge Ariel; et al.; Relativistic X-ray reflection and photoionized absorption in the neutron star low-mass X-ray binary GX 13+1; Wiley Blackwell Publishing, Inc; Monthly Notices of the Royal Astronomical Society; 522; 3; 7-2023; 3367-33770035-8711CONICET DigitalCONICETenginfo:eu-repo/semantics/altIdentifier/url/https://academic.oup.com/mnras/article/522/3/3367/7131466info:eu-repo/semantics/altIdentifier/doi/10.1093/mnras/stad1157info:eu-repo/semantics/openAccesshttps://creativecommons.org/licenses/by-nc-sa/2.5/ar/reponame:CONICET Digital (CONICET)instname:Consejo Nacional de Investigaciones Científicas y Técnicas2025-10-15T14:57:18Zoai:ri.conicet.gov.ar:11336/217978instacron:CONICETInstitucionalhttp://ri.conicet.gov.ar/Organismo científico-tecnológicoNo correspondehttp://ri.conicet.gov.ar/oai/requestdasensio@conicet.gov.ar; lcarlino@conicet.gov.arArgentinaNo correspondeNo correspondeNo correspondeopendoar:34982025-10-15 14:57:19.215CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicasfalse
dc.title.none.fl_str_mv Relativistic X-ray reflection and photoionized absorption in the neutron star low-mass X-ray binary GX 13+1
title Relativistic X-ray reflection and photoionized absorption in the neutron star low-mass X-ray binary GX 13+1
spellingShingle Relativistic X-ray reflection and photoionized absorption in the neutron star low-mass X-ray binary GX 13+1
Saavedra, Enzo Agustin
ACCRETION
ACCRETION DISKS
STARS: NEUTRON
STARS: INDIVIDUAL (GX 13+1)
title_short Relativistic X-ray reflection and photoionized absorption in the neutron star low-mass X-ray binary GX 13+1
title_full Relativistic X-ray reflection and photoionized absorption in the neutron star low-mass X-ray binary GX 13+1
title_fullStr Relativistic X-ray reflection and photoionized absorption in the neutron star low-mass X-ray binary GX 13+1
title_full_unstemmed Relativistic X-ray reflection and photoionized absorption in the neutron star low-mass X-ray binary GX 13+1
title_sort Relativistic X-ray reflection and photoionized absorption in the neutron star low-mass X-ray binary GX 13+1
dc.creator.none.fl_str_mv Saavedra, Enzo Agustin
García, Federico
Fogantini, Federico Adrián
Méndez, Mariano
Combi, Jorge Ariel
Luque Escamilla, Pedro L.
Martí, Josep
author Saavedra, Enzo Agustin
author_facet Saavedra, Enzo Agustin
García, Federico
Fogantini, Federico Adrián
Méndez, Mariano
Combi, Jorge Ariel
Luque Escamilla, Pedro L.
Martí, Josep
author_role author
author2 García, Federico
Fogantini, Federico Adrián
Méndez, Mariano
Combi, Jorge Ariel
Luque Escamilla, Pedro L.
Martí, Josep
author2_role author
author
author
author
author
author
dc.subject.none.fl_str_mv ACCRETION
ACCRETION DISKS
STARS: NEUTRON
STARS: INDIVIDUAL (GX 13+1)
topic ACCRETION
ACCRETION DISKS
STARS: NEUTRON
STARS: INDIVIDUAL (GX 13+1)
purl_subject.fl_str_mv https://purl.org/becyt/ford/1.3
https://purl.org/becyt/ford/1
dc.description.none.fl_txt_mv We analysed a dedicated NuSTAR observation of the neutron-star low-mass X-ray binary Z-source GX 13+1 to study the timing and spectral properties of the source. From the colour-colour diagram, we conclude that during that observation the source transitioned from the normal branch to the flaring branch. We fitted the spectra of the source in each branch with a model consisting of an accretion disc, a Comptonised blackbody, relativistic reflection (relxillNS), and photo-ionised absorption (warmabs). Thanks to the combination of the large effective area and good energy resolution of NuSTAR at high energies, we found evidence of relativistic reflection in both the Fe K line profile, and the Compton hump present in the 10-25 keV energy range. The inner disc radius is Rin ≲ 9.6 rg, which allowed us to further constrain the magnetic field strength to B ≲ 1.8 × 108 G. We also found evidence for the presence of a hot wind leading to photo-ionised absorption of Fe and Ni, with a Ni overabundance of ~6 times solar. From the spectral fits, we find that the distance between the ionising source and the slab of ionised absorbing material is ~4 - 40 × 105 km. We also found that the width of the boundary layer extends ~3 km above the surface of a neutron star, which yielded a neutron-star radius RNS ≲ 16 km. The scenario inferred from the spectral modelling becomes self-consistent only for high electron densities in the accretion disk, ne ~ 1022 - 1023 cm-3, as expected for a Shakura-Sunyaev disc, and significantly above the densities provided by relxillNS models. These results have implications for our understanding of the physical conditions in GX 13+1.
Fil: Saavedra, Enzo Agustin. Universidad Nacional de La Plata. Facultad de Ciencias Astronómicas y Geofísicas; Argentina. Provincia de Buenos Aires. Gobernación. Comisión de Investigaciones Científicas. Instituto Argentino de Radioastronomía. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata. Instituto Argentino de Radioastronomía; Argentina
Fil: García, Federico. Provincia de Buenos Aires. Gobernación. Comisión de Investigaciones Científicas. Instituto Argentino de Radioastronomía. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata. Instituto Argentino de Radioastronomía; Argentina
Fil: Fogantini, Federico Adrián. Provincia de Buenos Aires. Gobernación. Comisión de Investigaciones Científicas. Instituto Argentino de Radioastronomía. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata. Instituto Argentino de Radioastronomía; Argentina
Fil: Méndez, Mariano. Kapteyn Astronomical Institute; Países Bajos
Fil: Combi, Jorge Ariel. Provincia de Buenos Aires. Gobernación. Comisión de Investigaciones Científicas. Instituto Argentino de Radioastronomía. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata. Instituto Argentino de Radioastronomía; Argentina
Fil: Luque Escamilla, Pedro L.. Universidad de Jaén; España
Fil: Martí, Josep. Universidad de Jaén; España
description We analysed a dedicated NuSTAR observation of the neutron-star low-mass X-ray binary Z-source GX 13+1 to study the timing and spectral properties of the source. From the colour-colour diagram, we conclude that during that observation the source transitioned from the normal branch to the flaring branch. We fitted the spectra of the source in each branch with a model consisting of an accretion disc, a Comptonised blackbody, relativistic reflection (relxillNS), and photo-ionised absorption (warmabs). Thanks to the combination of the large effective area and good energy resolution of NuSTAR at high energies, we found evidence of relativistic reflection in both the Fe K line profile, and the Compton hump present in the 10-25 keV energy range. The inner disc radius is Rin ≲ 9.6 rg, which allowed us to further constrain the magnetic field strength to B ≲ 1.8 × 108 G. We also found evidence for the presence of a hot wind leading to photo-ionised absorption of Fe and Ni, with a Ni overabundance of ~6 times solar. From the spectral fits, we find that the distance between the ionising source and the slab of ionised absorbing material is ~4 - 40 × 105 km. We also found that the width of the boundary layer extends ~3 km above the surface of a neutron star, which yielded a neutron-star radius RNS ≲ 16 km. The scenario inferred from the spectral modelling becomes self-consistent only for high electron densities in the accretion disk, ne ~ 1022 - 1023 cm-3, as expected for a Shakura-Sunyaev disc, and significantly above the densities provided by relxillNS models. These results have implications for our understanding of the physical conditions in GX 13+1.
publishDate 2023
dc.date.none.fl_str_mv 2023-07
dc.type.none.fl_str_mv info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
http://purl.org/coar/resource_type/c_6501
info:ar-repo/semantics/articulo
format article
status_str publishedVersion
dc.identifier.none.fl_str_mv http://hdl.handle.net/11336/217978
Saavedra, Enzo Agustin; García, Federico; Fogantini, Federico Adrián; Méndez, Mariano; Combi, Jorge Ariel; et al.; Relativistic X-ray reflection and photoionized absorption in the neutron star low-mass X-ray binary GX 13+1; Wiley Blackwell Publishing, Inc; Monthly Notices of the Royal Astronomical Society; 522; 3; 7-2023; 3367-3377
0035-8711
CONICET Digital
CONICET
url http://hdl.handle.net/11336/217978
identifier_str_mv Saavedra, Enzo Agustin; García, Federico; Fogantini, Federico Adrián; Méndez, Mariano; Combi, Jorge Ariel; et al.; Relativistic X-ray reflection and photoionized absorption in the neutron star low-mass X-ray binary GX 13+1; Wiley Blackwell Publishing, Inc; Monthly Notices of the Royal Astronomical Society; 522; 3; 7-2023; 3367-3377
0035-8711
CONICET Digital
CONICET
dc.language.none.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv info:eu-repo/semantics/altIdentifier/url/https://academic.oup.com/mnras/article/522/3/3367/7131466
info:eu-repo/semantics/altIdentifier/doi/10.1093/mnras/stad1157
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
eu_rights_str_mv openAccess
rights_invalid_str_mv https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
dc.format.none.fl_str_mv application/pdf
application/pdf
dc.publisher.none.fl_str_mv Wiley Blackwell Publishing, Inc
publisher.none.fl_str_mv Wiley Blackwell Publishing, Inc
dc.source.none.fl_str_mv reponame:CONICET Digital (CONICET)
instname:Consejo Nacional de Investigaciones Científicas y Técnicas
reponame_str CONICET Digital (CONICET)
collection CONICET Digital (CONICET)
instname_str Consejo Nacional de Investigaciones Científicas y Técnicas
repository.name.fl_str_mv CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicas
repository.mail.fl_str_mv dasensio@conicet.gov.ar; lcarlino@conicet.gov.ar
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score 13.22299

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