Modeling magnetar outbursts: flux enhancements and the connection with short bursts and glitches

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Title: Modeling magnetar outbursts: flux enhancements and the connection with short bursts and glitches
Authors: Pons, José A. | Rea, Nanda
Research Group/s: Astrofísica Relativista
Center, Department or Service: Universidad de Alicante. Departamento de Física Aplicada
Keywords: Stars: magnetars | Stars: neutron | X-rays: bursts
Knowledge Area: Astronomía y Astrofísica
Issue Date: 9-Apr-2012
Publisher: IOP Publishing
Citation: The Astrophysical Journal Letters. 2012, 750(1): L6. doi:10.1088/2041-8205/750/1/L6
Abstract: The availability of a large amount of observational data recently collected from magnetar outbursts is now calling for a complete theoretical study of outburst characteristics. In this Letter (the first of a series dedicated to modeling magnetar outbursts), we tackle the long-standing open issue of whether or not short bursts and glitches are always connected to long-term radiative outbursts. We show that the recent detection of short bursts and glitches seemingly unconnected to outbursts is only misleading our understanding of these events. We show that, in the framework of the starquake model, neutrino emission processes in the magnetar crust limit the temperature, and therefore the luminosity. This natural limit to the maximum luminosity makes outbursts associated with bright persistent magnetars barely detectable. These events are simply seen as a small luminosity increase over the already bright quiescent state, followed by a fast return to quiescence. In particular, this is the case for 1RXS J1708–4009, 1E 1841–045, SGR 1806–20, and other bright persistent magnetars. On the other hand, a similar event (with the same energetics) in a fainter source will drive a more extreme luminosity variation and longer cooling time, as for sources such as XTE J1810–197, 1E 1547–5408, and SGR 1627–41. We conclude that the non-detection of large radiative outbursts in connection with glitches and bursts from bright persistent magnetars is not surprising per se, nor does it need any revision of the glitches and burst mechanisms as explained by current theoretical models.
Sponsor: This work was partly supported by Compstar, a Research Networking Programme of the European Science Foundation and grants AYA2010-21097-C03-02, GVPROMETEO2009-13 (J.A.P.) and AYA2009-07391, SGR2009-811, iLINK 2011- 0303, and TW2010005 (N.R.). N.R. is supported by a Ramón y Cajal fellowship through Consejo Superior de Investigaciones Científicas (CSIC).
ISSN: 2041-8205 (Print) | 2041-8213 (Online)
DOI: 10.1088/2041-8205/750/1/L6
Language: eng
Type: info:eu-repo/semantics/article
Rights: © 2012. The American Astronomical Society
Peer Review: si
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Appears in Collections:INV - Astrofísica Relativista - Artículos de Revistas

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