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arXiv 2008.03671astro-ph.HEastro-ph.SR
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PSR J1124 --5916中状态转移行为的发现

Discovery of state transition behaviors in PSR J1124--5916

M. Y. Ge, J. P. Yuan, F. J. Lu, H. Tong, S. Q. Zhou, L. L. Yan, L. J. Wang, Y. L. Tuo, X. F. Li, L. M. Song

摘要:

利用{ \sl Fermi}-LAT对PSR J 1124 - 5916进行了12年的观测,发现了两对自旋向下的态跃迁,使它成为第二颗被探测到具有自旋向下态跃迁的年轻脉冲星。PSR J1124- 5916的自旋降速演化主要表现为正常自旋降速态和低自旋降速态。在约80%的观测时间内,脉冲星处于正常的自旋下降状态,自旋下降速率线性减小,并给出一个制动指数$1.98\pm0.04$。到低自旋下降状态的两个跃迁分别在MJD 55183- 55803和MJD 56114- 56398中,分数幅度都是$\sim0.4\%$。观测到两个自旋下降态的$γ$射线轮廓没有显著差异,这与另一颗观测到状态跃迁的年轻脉冲星PSR B 0540 -69的情况相似。

英文摘要:

With the twelve-year long observations by {\sl Fermi}-LAT, we discover two pairs of spin-down state transitions of PSR J1124--5916, making it the second young pulsar detected to have such behaviors. PSR J1124--5916 shows mainly two states according to its spin-down rate evolution, the normal spin-down state and the low spin-down state. In about 80\% of the observation time, the pulsar is in the normal spin-down state, in which the spin-down rate decreases linearly and gives a braking index of $1.98\pm0.04$. The two transitions to the low spin-down state are in MJD 55183--55803 and MJD 56114--56398 respectively, with fractional amplitudes both $\sim0.4\%$. No significant difference between the $γ$-ray profiles of the two spin-down states is detected, which is similar to PSR B0540-69, the other young pulsar with state transition detected.

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