Please use this identifier to cite or link to this item:
http://hdl.handle.net/20.500.12386/30265
Title: | Chandra monitoring of the Galactic Centre magnetar SGR J1745-2900 during the initial 3.5 years of outburst decay | Authors: | Coti Zelati, F. Rea, N. Turolla, R. Pons, J. A. PAPITTO, ALESSANDRO Esposito, P. ISRAEL, Gian Luca CAMPANA, Sergio Zane, S. Tiengo, A. MIGNANI, Roberto MEREGHETTI, Sandro Baganoff, F. K. Haggard, D. PONTI, GABRIELE Torres, D. F. Borghese, A. Elfritz, J. |
Issue Date: | 2017 | Journal: | MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY | Number: | 471 | Issue: | 2 | First Page: | 1819 | Abstract: | We report on 3.5 yr of Chandra monitoring of the Galactic Centre magnetar SGR J1745-2900 since its outburst onset in 2013 April. The magnetar spin-down has shown at least two episodes of period derivative increases so far, and it has slowed down regularly in the past year or so. We observed a slightly increasing trend in the time evolution of the pulsed fraction, up to ∼55 per cent in the most recent observations. SGR J1745-2900 has not reached the quiescent level yet, and so far the overall outburst evolution can be interpreted in terms of a cooling hot region on the star surface. We discuss possible scenarios, showing in particular how the presence of a shrinking hotspot in this source is hardly reconcilable with internal crustal cooling and favours the untwisting bundle model for this outburst. Moreover, we also show how the emission from a single uniform hotspot is incompatible with the observed pulsed fraction evolution for any pair of viewing angles, suggesting an anisotropic emission pattern. | URI: | http://hdl.handle.net/20.500.12386/30265 | URL: | https://academic.oup.com/mnras/article/471/2/1819/3930866 | ISSN: | 0035-8711 | DOI: | 10.1093/mnras/stx1700 | Bibcode ADS: | 2017MNRAS.471.1819C | Fulltext: | open |
Appears in Collections: | 1.01 Articoli in rivista |
Files in This Item:
File | Description | Size | Format | |
---|---|---|---|---|
2017-CotiZelati-stx1700.pdf | Pdf editoriale | 858.69 kB | Adobe PDF | View/Open |
Page view(s)
61
checked on Apr 20, 2024
Download(s)
11
checked on Apr 20, 2024
Google ScholarTM
Check
Altmetric
Altmetric
Items in DSpace are published in Open Access, unless otherwise indicated.