On the Rate of Crustal Failures in Young Magnetars
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http://hdl.handle.net/10045/110108
Title: | On the Rate of Crustal Failures in Young Magnetars |
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Authors: | Dehman, Clara | Viganò, Daniele | Rea, Nanda | Pons, José A. | Perna, Rosalba | Garcia-Garcia, Alberto |
Research Group/s: | Astrofísica Relativista |
Center, Department or Service: | Universidad de Alicante. Departamento de Física Aplicada |
Keywords: | Magnetars | Neutron stars | Magnetic fields | Radio transient sources |
Knowledge Area: | Astronomía y Astrofísica |
Issue Date: | 19-Oct-2020 |
Publisher: | IOP Publishing |
Citation: | The Astrophysical Journal Letters. 2020, 902:L32 (7pp). https://doi.org/10.3847/2041-8213/abbda9 |
Abstract: | The activity of magnetars is powered by their intense and dynamic magnetic fields and has been proposed as the trigger to extragalactic fast radio bursts. Here we estimate the frequency of crustal failures in young magnetars, by computing the magnetic stresses in detailed magnetothermal simulations including Hall drift and ohmic dissipation. The initial internal topology at birth is poorly known but is likely to be much more complex than a dipole. Thus, we explore a wide range of initial configurations, finding that the expected rate of crustal failures varies by orders of magnitude depending on the initial magnetic configuration. Our results show that this rate scales with the crustal magnetic energy, rather than with the often used surface value of the dipolar component related to the spin-down torque. The estimated frequency of crustal failures for a given dipolar component can vary by orders of magnitude for different initial conditions, depending on how much magnetic energy is distributed in the crustal nondipolar components, likely dominant in newborn magnetars. The quantitative reliability of the expected event rate could be improved by a better treatment of the magnetic evolution in the core and the elastic/plastic crustal response, not included here. Regardless of that, our results are useful inputs in modeling the outburst rate of young Galactic magnetars, and their relation with the fast radio bursts in our and other galaxies. |
Sponsor: | C.D., D.V., N.R., and A.G.G. are supported by the ERC Consolidator Grant “MAGNESIA” (No. 817661) and acknowledge funding from grants SGR2017-1383 and PGC2018-095512-BI00. J.A.P. acknowledges support by the Generalitat Valenciana (PROMETEO/2019/071) and by AEI grant PGC2018-095984-BI00. R.P. acknowledges support from NSF award AST-1616157. We acknowledge support from the PHAROS COST Action (CA16214). |
URI: | http://hdl.handle.net/10045/110108 |
ISSN: | 2041-8205 (Print) | 2041-8213 (Online) |
DOI: | 10.3847/2041-8213/abbda9 |
Language: | eng |
Type: | info:eu-repo/semantics/article |
Rights: | © 2020 The American Astronomical Society |
Peer Review: | si |
Publisher version: | https://doi.org/10.3847/2041-8213/abbda9 |
Appears in Collections: | INV - Astrofísica Relativista - Artículos de Revistas |
Files in This Item:
File | Description | Size | Format | |
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Dehman_etal_2020_ApJL_final.pdf | Versión final (acceso restringido) | 1,75 MB | Adobe PDF | Open Request a copy |
Dehman_etal_2020_ApJL_preprint.pdf | Preprint (acceso abierto) | 2,59 MB | Adobe PDF | Open Preview |
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