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http://hdl.handle.net/20.500.12386/31865
Title: | The New Magnetar SGR J1830-0645 in Outburst | Authors: | Coti Zelati, F. Borghese, A. ISRAEL, Gian Luca Rea, N. Esposito, P. PILIA, Maura BURGAY, MARTA POSSENTI, ANDREA CORONGIU, ALESSANDRO RIDOLFI, ALESSANDRO Dehman, C. Viganò, D. Turolla, R. Zane, S. Tiengo, A. Keane, E. F. |
Issue Date: | 2021 | Journal: | THE ASTROPHYSICAL JOURNAL LETTERS | Number: | 907 | Issue: | 2 | First Page: | L34 | Abstract: | The detection of a short hard X-ray burst and an associated bright soft X-ray source by the Swift satellite in 2020 October heralded a new magnetar in outburst, SGR J1830-0645. Pulsations at a period of ∼10.4 s were detected in prompt follow-up X-ray observations. We present here the analysis of the Swift/Burst Alert Telescope burst, of XMM-Newton and the Nuclear Spectroscopic Telescope Array observations performed at the outburst peak, and of a Swift/X-ray Telescope monitoring campaign over the subsequent month. The burst was single-peaked, lasted ∼6 ms, and released a fluence of ≍5 × 10<SUP>-9</SUP> erg cm<SUP>-2</SUP> (15-50 keV). The spectrum of the X-ray source at the outburst peak was well described by an absorbed double-blackbody model plus a power-law component detectable up to ∼25 keV. The unabsorbed X-ray flux decreased from ∼5 × 10<SUP>-11</SUP> to ∼2.5 × 10<SUP>-11</SUP> erg cm<SUP>-2</SUP> s<SUP>-1</SUP> one month later (0.3-10 keV). Based on our timing analysis, we estimate a dipolar magnetic field ≍5.5 × 10<SUP>14</SUP> G at pole, a spin-down luminosity ≍2.4 × 10<SUP>32</SUP> erg s<SUP>-1</SUP>, and a characteristic age ≍24 kyr. The spin modulation pattern appears highly pulsed in the soft X-ray band, and becomes smoother at higher energies. Several short X-ray bursts were detected during our campaign. No evidence for periodic or single-pulse emission was found at radio frequencies in observations performed with the Sardinia Radio Telescope and Parkes. According to magneto-thermal evolutionary models, the real age of SGR J1830-0645 is close to the characteristic age, and the dipolar magnetic field at birth was slightly larger, ∼10<SUP>15</SUP> G. | URI: | http://hdl.handle.net/20.500.12386/31865 | URL: | https://iopscience.iop.org/article/10.3847/2041-8213/abda52 https://api.elsevier.com/content/abstract/scopus_id/85100771764 |
ISSN: | 2041-8205 | DOI: | 10.3847/2041-8213/abda52 | Bibcode ADS: | 2021ApJ...907L..34C | Fulltext: | open |
Appears in Collections: | 1.01 Articoli in rivista |
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File | Description | Size | Format | |
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2011.08653.pdf | preprint | 2.84 MB | Adobe PDF | View/Open |
Zelati_2021_ApJL_907_L34.pdf | [Administrators only] | 2 MB | Adobe PDF |
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