论文标题
新发现的毫秒脉冲脉冲〜J1816--195从Insight-HXMT和NoTER观察到的多产热核X射线爆发。
The prolific thermonuclear X-ray bursts from the outburst of the newly discovered millisecond pulsar MAXI~J1816--195 observed by Insight-HXMT and NICER
论文作者
论文摘要
Maxi J1816-195是一种新发现的带有多产热核突发的积聚的脉冲星，在6月2022年爆发期间，Insight-HXMT和Bieler在其爆发期间被发现。在爆发期间，Insight-HXMT在其峰值和衰减阶段检测到73次爆发，是在积聚的毫秒脉冲星中发现的多产爆发系统。通过分析一个由Insight-HXMT和更好的爆发检测到的一个爆发，我们发现了与常规黑体模型的轻度偏差。通过堆叠具有相似曲线和强度的66次爆发的洞察力HXMT光曲线，在30-100 KEV中检测到硬X射线短缺，其显着性为15.7 Sigma。短缺约为持续通量的30％，与其他毛毛相比，这是低的。短缺分数是能量依赖性的：在较高能量带中较大。这些发现使新发现的毫秒Maxi J1816-195与其他毫秒脉冲星和环礁毛毛相比，是一个相当奇特的系统。另外，基于最明亮的爆发，我们得出了距离为6.3 kpc的上限，因此估计积聚盘的内盘半径的上限为约40 km。假设半径是磁层半径，衍生的磁场强度约为7.1*10^8G。
MAXI J1816-195 is a newly discovered accreting millisecond pulsar with prolific thermonuclear bursts, detected during its outburst in 2022 June by Insight-HXMT and NICER. During the outburst, Insight-HXMT detected 73 bursts in its peak and decay phase, serving as a prolific burst system found in the accreting millisecond pulsars. By analyzing one burst which was simultaneously detected by Insight-HXMT and NICER, we find a mild deviation from the conventional blackbody model. By stacking the Insight-HXMT lightcurves of 66 bursts which have similar profiles and intensities, a hard X-ray shortage is detected with a significance of 15.7 sigma in 30-100 keV. The shortage is about 30% of the persistent flux, which is low compared with other bursters. The shortage fraction is energy-dependent: larger in a higher energy band. These findings make the newly discovered millisecond MAXI J1816-195 a rather peculiar system compared with other millisecond pulsars and atoll bursters. In addition, based on the brightest burst, we derive an upper limit of the distance as 6.3 kpc, and therefore estimate the upper limit of the inner disc radius of the accretion disc to be~ 40 km. Assuming the radius as the magnetospheric radius, the derived magnetic field strength is about 7.1*10^8 G.
