Detecting emission lines with XMM-Newton in 4U 1538–52

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Title: Detecting emission lines with XMM-Newton in 4U 1538–52
Authors: Rodes Roca, José Joaquín | Page, Kim L. | Torrejon, Jose M. | Osborne, Julian P. | Bernabeu, Guillermo
Research Group/s: Astronomía y Astrofísica
Center, Department or Service: Universidad de Alicante. Departamento de Física, Ingeniería de Sistemas y Teoría de la Señal
Keywords: X-rays: binaries | Pulsars: individual: 4U 1538−52
Knowledge Area: Física Aplicada | Astronomia y Astrofísica
Issue Date: Feb-2011
Publisher: EDP Sciences
Citation: Astronomy & Astrophysics. 2011, 526: A64. doi:10.1051/0004-6361/201014324
Abstract: 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.
Sponsor: 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.
ISSN: 0004-6361 (Print) | 1432-0746 (Online)
DOI: 10.1051/0004-6361/201014324
Language: eng
Type: info:eu-repo/semantics/article
Rights: © ESO 2010
Peer Review: si
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Appears in Collections:INV - Astronomía y Astrofísica - Artículos de Revistas

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