X-Ray and Radio Observations of the Magnetar SGR J1935+2154 during Its 2014, 2015, and 2016 Outbursts
dc.citation.articleNumber | 85 | |
dc.citation.journalTitle | The Astrophysical Journal | |
dc.citation.volumeNumber | 847 | |
dc.contributor.author | Younes, George | |
dc.contributor.author | Kouveliotou, Chryssa | |
dc.contributor.author | Jaodand, Amruta | |
dc.contributor.author | Baring, Matthew G. | |
dc.contributor.author | van der Horst, Alexander J. | |
dc.contributor.author | Harding, Alice K. | |
dc.contributor.author | Hessels, Jason W.T. | |
dc.contributor.author | Gehrels, Neil | |
dc.contributor.author | Gill, Ramandeep | |
dc.contributor.author | Huppenkothen, Daniela | |
dc.contributor.author | Granot, Jonathan | |
dc.contributor.author | Göğüş Ersin | |
dc.contributor.author | Lin, Lin | |
dc.date.accessioned | 2017-10-19T17:11:53Z | |
dc.date.available | 2017-10-19T17:11:53Z | |
dc.date.issued | 2017 | |
dc.description.abstract | We analyzed broadband X-ray and radio data of the magnetar SGR J1935+2154 taken in the aftermath of its 2014, 2015, and 2016 outbursts. The source soft X-ray spectrum <10 keV is well described with a blackbody+power-law (BB+PL) or 2BB model during all three outbursts. Nuclear Spectroscopic Telescope Array observations revealed a hard X-ray tail, with a PL photon index Γ = 0.9, extending up to 50 keV, with flux comparable to the one detected <10 keV. Imaging analysis of Chandra data did not reveal small-scale extended emission around the source. Following the outbursts, the total 0.5–10 keV flux from SGR J1935+2154 increased in concordance to its bursting activity, with the flux at activation onset increasing by a factor of ~7 following its strongest 2016 June outburst. A Swift/X-Ray Telescope observation taken 1.5 days prior to the onset of this outburst showed a flux level consistent with quiescence. We show that the flux increase is due to the PL or hot BB component, which increased by a factor of 25 compared to quiescence, while the cold BB component kT = 0.47 keV remained more or less constant. The 2014 and 2015 outbursts decayed quasi-exponentially with timescales of ~40 days, while the stronger 2016 May and June outbursts showed a quick short-term decay with timescales of about four days. Our Arecibo radio observations set the deepest limits on the radio emission from a magnetar, with a maximum flux density limit of 14 μJy for the 4.6 GHz observations and 7 μJy for the 1.4 GHz observations. We discuss these results in the framework of the current magnetar theoretical models. | |
dc.identifier.citation | Younes, George, Kouveliotou, Chryssa, Jaodand, Amruta, et al.. "X-Ray and Radio Observations of the Magnetar SGR J1935+2154 during Its 2014, 2015, and 2016 Outbursts." <i>The Astrophysical Journal,</i> 847, (2017) The American Astronomical Society: https://doi.org/10.3847/1538-4357/aa899a. | |
dc.identifier.digital | Younes_2017_ApJ_847_85 | |
dc.identifier.doi | https://doi.org/10.3847/1538-4357/aa899a | |
dc.identifier.uri | https://hdl.handle.net/1911/97804 | |
dc.language.iso | eng | |
dc.publisher | The American Astronomical Society | |
dc.rights | Article is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use. | |
dc.title | X-Ray and Radio Observations of the Magnetar SGR J1935+2154 during Its 2014, 2015, and 2016 Outbursts | |
dc.type | Journal article | |
dc.type.dcmi | Text | |
dc.type.publication | publisher version |
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