Detecting emission lines with XMM-Newton in 4U 1538–52
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Título: | Detecting emission lines with XMM-Newton in 4U 1538–52 |
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Autor/es: | Rodes Roca, José Joaquín | Page, Kim L. | Torrejon, Jose M. | Osborne, Julian P. | Bernabeu, Guillermo |
Grupo/s de investigación o GITE: | Astronomía y Astrofísica |
Centro, Departamento o Servicio: | Universidad de Alicante. Departamento de Física, Ingeniería de Sistemas y Teoría de la Señal |
Palabras clave: | X-rays: binaries | Pulsars: individual: 4U 1538−52 |
Área/s de conocimiento: | Física Aplicada | Astronomia y Astrofísica |
Fecha de publicación: | feb-2011 |
Editor: | EDP Sciences |
Cita bibliográfica: | Astronomy & Astrophysics. 2011, 526: A64. doi:10.1051/0004-6361/201014324 |
Resumen: | Context. The properties of the X-ray emission lines are a fundamental tool for studying the nature of the matter surrounding the neutron star and the phenomena that produce these lines. Aims. The aim of this work is to analyse the X-ray spectrum of 4U 1538−52 obtained by the XMM-Newton observatory and to look for the presence of diagnostic lines in the energy range 0.3−11.5 keV. Methods. We used a 54 ks PN & MOS/XMM-Newton observation of the high-mass X-ray binary 4U 1538−52 covering the orbital phase between 0.75 to 1.00 (the eclipse ingress). We modelled the 0.3−11.5 keV continuum emission with three absorbed power laws and looked for the emission lines. Results. We found previously unreported recombination lines in this system at ~2.4 keV, ~1.9 keV, and ~1.3 keV, which is consistent with the presence of highly ionized states of S XV Heα, Si XIII Heα, and either Mg Kα or Mg XI Heα. On the other hand, in spectra that are both out of eclipse and in eclipse, we detect a fluorescence iron emission line at 6.4 keV, which is resolved into two components: a narrow (σ ≤ 10 eV) fluorescence Fe Kα line plus one hot line from highly photoionized Fe XXV. Conclusions. The detection of new recombination lines during eclipse ingress in 4U 1538−52 indicates that there is an extended ionized region surrounding the neutron star. |
Patrocinador/es: | Part of this work was supported by the Spanish Ministry of Education and Science Primera ciencia con el GTC: La astronomía española en vanguardia de la astronomía europea CSD200670 and Multiplicidad y evolución de estrellas masivas project number AYA200806166C0303 and partially supported by AYA2010-15431. J.J.R.R. acknowledges the support by the Spanish Ministerio de Educación y Ciencia under grant PR2009-0455. |
URI: | http://hdl.handle.net/10045/89569 |
ISSN: | 0004-6361 (Print) | 1432-0746 (Online) |
DOI: | 10.1051/0004-6361/201014324 |
Idioma: | eng |
Tipo: | info:eu-repo/semantics/article |
Derechos: | © ESO 2010 |
Revisión científica: | si |
Versión del editor: | https://doi.org/10.1051/0004-6361/201014324 |
Aparece en las colecciones: | INV - Astronomía y Astrofísica - Artículos de Revistas |
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2011_Rodes-Roca_etal_A&A.pdf | 413,85 kB | Adobe PDF | Abrir Vista previa | |
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