A T N F    D a i l y    A s t r o n o m y    P i c t u r e

10th of December 2020
Swift J1830.7-0645 -- a new magnetar
by Coti Zelati et al.
On 2020 October 10, the Burst Alert Telescope (BAT) on board the Neil Gehrels Swift Observatory triggered on a short, hard X-ray burst. Prompt observations with the Swift X-ray Telescope (XRT) localized a new uncatalogued X-ray source, Swift J1830.7−0645. A periodic signal at ∼10.4 s was detected in the XRT data. The burst properties, the periodicity detected in the prompt follow-up observations, and the proximity of the source to the Galactic plane indicated a newly discovered magnetar in outburst. A magnetar is an isolated neutron star powered by dissipation of their own magnetic energy, which usually implies that they are endowed with huge magnetic fields, up to ∼10^15 gauss. A large fraction of the ∼30 magnetars known to date have been discovered over the past two decades. The image above shows light curves of Swift J1830.7-0645 extracted from the Swift/XRT data, with detected X-ray bursts marked by arrows. Radio observations, with both the Parkes 64m and Sardinia 64m radio telescopes, found no evidence for periodic or single-pulse emission at radio frequencies. However, the non-detection of radio pulsations is not that surprising, as examples of both radio-loud and radio-silent magnetars have previously been documented. More details are given in the paper by Coti Zelati et al.

<<   |   archive   |   about   |   today   *   ATNF   |   Parkes   |   ATCA   |   Mopra   |   VLBI   |   ASKAP   |   >>