INTEGRAL Discovery of a Burst with Associated Radio Emission from the Magnetar SGR 1935+2154
INTEGRAL Discovery of a Burst with Associated Radio Emission from the Magnetar SGR 1935+2154
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DOI：
10.3847/2041-8213/aba2cf
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发表时间：
2020-05
期刊：
影响因子：
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通讯作者：
S. Mereghetti;V. Savchenko;C. Ferrigno;D. Götz;M. Rigoselli;A. Tiengo;A. Bazzano;E. Bozzo;
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作者：
S. Mereghetti;V. Savchenko;C. Ferrigno;D. Götz;M. Rigoselli;A. Tiengo;A. Bazzano;E. Bozzo;
我们报告了国际伽玛射线天体物理实验室（INTEGRAL）在2020年4月28日至5月3日期间对软γ射线中继器SGR 1935+2154的观测。在20-200 keV范围内，用IBIS仪器探测到几个影响为erg cm−2的短脉冲。由INTEGRAL暴警系统实时发现并定位的最硬光谱暴，在空间和时间上与加拿大氢强度映射实验（CHIME）和瞬态天文射电发射2 （STARE2）射电望远镜分别在400-800 MHz和1.4 GHz探测到的短而亮的射电暴在空间和时间上是一致的。它的光曲线显示三个间隔约29 ms的窄峰，叠加在持续约0.6 s的宽脉冲上。最亮的峰值相对于1.4 GHz的无线电脉冲有6.5±1.0 ms的延迟（这与在较低频率下看到的第二个最亮的成分一致）。暴谱是一个具有光子指数和峰值能量的指数截断幂律，比通常从这颗磁星和其他磁星观测到的暴谱更难。通过分析Neil Gehrels Swift天文台x射线望远镜（XRT）在x射线中看到的膨胀尘埃散射环，我们得出SGR 1935+2154的距离为kpc，独立于它与超新星遗迹G57.2+0.8的可能关联。在这个距离上，erg cm−2的20 - 200kev的爆发能量对应于erg的各向同性发射能量。这是第一次用软γ射线中继器观测到与之对应的射电暴，它有力地支持了基于磁星的星系外快速射电暴模型。
We report on International Gamma-Ray Astrophysics Laboratory (INTEGRAL) observations of the soft γ-ray repeater SGR 1935+2154 performed between 2020 April 28 and May 3. Several short bursts with fluence of erg cm−2 were detected by the Imager on-board INTEGRAL (IBIS) instrument in the 20–200 keV range. The burst with the hardest spectrum, discovered and localized in real time by the INTEGRAL Burst Alert System, was spatially and temporally coincident with a short and very bright radio burst detected by the Canadian Hydrogen Intensity Mapping Experiment (CHIME) and Survey for Transient Astronomical Radio Emission 2 (STARE2) radio telescopes at 400–800 MHz and 1.4 GHz, respectively. Its lightcurve shows three narrow peaks separated by ∼29 ms time intervals, superimposed on a broad pulse lasting ∼0.6 s. The brightest peak had a delay of 6.5 ± 1.0 ms with respect to the 1.4 GHz radio pulse (that coincides with the second and brightest component seen at lower frequencies). The burst spectrum, an exponentially cutoff power law with photon index and peak energy , is harder than those of the bursts usually observed from this and other magnetars. By the analysis of an expanding dust-scattering ring seen in X-rays with the Neil Gehrels Swift Observatory X-ray Telescope (XRT) instrument, we derived a distance of kpc for SGR 1935+2154, independent of its possible association with the supernova remnant G57.2+0.8. At this distance, the burst 20–200 keV fluence of erg cm−2 corresponds to an isotropic emitted energy of erg. This is the first burst with a radio counterpart observed from a soft γ-ray repeater and it strongly supports models based on magnetars that have been proposed for extragalactic fast radio bursts.