GB 790305 as a very strongly magnetized neutron star
GB 790305 as a very strongly magnetized neutron star
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发表时间：
1992
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通讯作者：
B. Paczyński
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作者：
B. Paczyński
1979年3月5日的事件是有史以来观测到的最强烈的伽马射线爆发。它在天空中的位置已知的精度约为10角秒，它与大麦哲伦星云中的N49超新星遗迹相吻合。主爆发之后是一个周期性的8秒调制的软尾，在接下来的几年里有16个软伽马事件。如果源是磁中子星星，其自转周期为8 s，年龄约为10 exp 4年，如N49所示，则场强约为5 x 10 exp 14高斯。由于强磁场抑制了电子散射不透明度，相应的临界亮度约为10 exp 4 L（Edd）。这个光度与观测到的软尾和软中继星的峰值通量是一致的。软光谱可以用kT（eff）= 17 keV处的光球发射来近似。相应的光球半径约为14公里，符合中子星星假说。这颗星星的总磁能约为4 × 10 exp 46 erg，足以为3月5日的事件及其所有中继器提供动力。
The March 5 1979 event was the strongest gamma-ray burst ever observed. Its location in the sky is known with an accuracy of about 10 arcsec, and it coincides with the N49 supernova remnant in the Large Magellanic Cloud. The main burst was followed by a soft tail with the periodic 8 s modulation, and 16 soft gamma events over the following few years. If the source is a magnetic neutron star with the 8 s rotation period and the age of about 10 exp 4 years as indicated by N49 then the field strength of about 5 x 10 exp 14 gauss is implied. The corresponding critical luminosity is about 10 exp 4 L(Edd), as the electron scattering opacity is suppressed by the strong magnetic field. This luminosity is consistent with the observed peak flux of the soft tail and the soft repeaters. The soft spectrum may be approximated with the photospheric emission at kT(eff) = 17 keV. The corresponding photospheric radius is about 14 km, compatible with a neutron star hypothesis. The total magnetic energy of the star is about 4 x 10 exp 46 erg, more than enough to power the March 5 event and all its repeaters.