The accretion environment in Vela X-1 during a flaring period using XMM-Newton

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Details zur Publikation

Autorinnen und Autoren: Martinez-Nunez S, Torrejon JM, Kühnel M, Kretschmar P, Stuhlinger M, Rodes-Roca JJ, Fuerst F, Kreykenbohm I, Martin-Carrillo A, Pollock AMT, Wilms J
Zeitschrift: Astronomy & Astrophysics
Jahr der Veröffentlichung: 2014
Band: 563
ISSN: 1432-0746


We present analysis of 100 ks contiguous XMM-Newton data of the prototypical wind accretor Vela X-1. The observation covered eclipse egress between orbital phases 0.134 and 0.265, during which a giant flare took place, enabling us to study the spectral properties both outside and during the flare. This giant flare with a peak luminosity of 3.92(-0.09)(+0.42) x 10(37) erg s(-1) allows estimates of the physical parameters of the accreted structure with a mass of similar to 10(21) g. We have been able to model several contributions to the observed spectrum with a phenomenological model formed by three absorbed power laws plus three emission lines. After analysing the variations with orbital phase of the column density of each component, as well as those in the Fe and Ni fluorescence lines, we provide a physical interpretation for each spectral component. Meanwhile, the first two components are two aspects of the principal accretion component from the surface of the neutron star, the third component seems to be the X-ray light echo formed in the stellar wind of the companion.

FAU-Autorinnen und Autoren / FAU-Herausgeberinnen und Herausgeber

Kreykenbohm, Ingo Dr.
Dr.Karl-Remeis-Sternwarte Bamberg, Astronomisches Institut
Wilms, Jörn Prof. Dr.
Professur für Astronomie und Astrophysik

Einrichtungen weiterer Autorinnen und Autoren

California Institute of Technology (Caltech)
European Space Astronomy Centre (ESAC)
Universitat d'Alacant (UA) / University of Alicante
University College Dublin (UCD)


Martinez-Nunez, S., Torrejon, J.M., Kühnel, M., Kretschmar, P., Stuhlinger, M., Rodes-Roca, J.J.,... Wilms, J. (2014). The accretion environment in Vela X-1 during a flaring period using XMM-Newton. Astronomy & Astrophysics, 563.

Martinez-Nunez, Silvia, et al. "The accretion environment in Vela X-1 during a flaring period using XMM-Newton." Astronomy & Astrophysics 563 (2014).


Zuletzt aktualisiert 2019-19-04 um 11:08