无线电和Gamma-Ray对PSR J2043 +2740的发射几何和发射位置的限制
Radio and Gamma-Ray Constraints on the Emission Geometry and Birthplace of PSR J2043+2740
摘要：
我们报告的第一年费米伽马射线观测脉冲高能发射从旧PSR J2043 + 2740。对这些老恒星的伽马射线效率的研究使我们能够深入了解恒星随着年龄的增长而发射伽马射线的能力的演变。这颗脉冲星在0.1 GeV以上的伽马射线光变曲线由两个尖锐的峰值清楚地定义，相隔0.353 +/-0.035个周期。我们结合了PSR J2043 + 2740的伽马射线剖面特征与脉冲星的无线电发射的几何特性，来自无线电极化数据，并约束脉冲星束几何结构的框架内的两极焦散和外间隙模型。两极焦散线模型的磁倾角和视角范围为{α，zeta}~{52 - 57，61 - 68}，外隙模型的磁倾角和视角范围为{α，zeta}~{62 - 73，74 - 81}和{α，zeta}~{72 - 83，60 - 75}。基于这种几何形状，我们评估可能的诞生地点，这颗脉冲星，并得出一个可能的自行，足够高的VLBI测量。PSR J2043 + 2740的特征年龄为120万年，是所有发现的非回收伽马射线天体中第三古老的：它的年龄是第二古老的PSR J0357 + 32的两倍，并且仅比最近发现的PSR J1836 + 5925和PSR J2055 + 25年轻，这两个天体的能量分别至少低5倍和10倍。
英文摘要：
We report on the first year of Fermi gamma-ray observations of pulsed high-energy emission from the old PSR J2043+2740. The study of the gamma-ray efficiency of such old pulsars gives us an insight into the evolution of pulsars' ability to emit in gammma rays as they age. The gamma-ray lightcurve of this pulsar above 0.1 GeV is clearly defined by two sharp peaks, 0.353+/-0.035 periods apart. We have combined the gamma-ray profile characteristics of PSR J2043+2740 with the geometrical properties of the pulsar's radio emission, derived from radio polarization data, and constrained the pulsar-beam geometry in the framework of a Two Pole Caustic and an Outer Gap model. The ranges of magnetic inclination and viewing angle were determined to be {alpha,zeta}~{52-57,61-68} for the Two Pole Caustic model, and {alpha,zeta}~{62-73,74-81} and {alpha,zeta}~{72-83,60-75} for the Outer Gap model. Based on this geometry, we assess possible birth locations for this pulsar and derive a likely proper motion, sufficiently high to be measurable with VLBI. At a characteristic age of 1.2 Myr, PSR J2043+2740 is the third oldest of all discovered, non-recycled, gamma-ray pulsars: it is twice as old as the next oldest, PSR J0357+32, and younger only than the recently discovered PSR J1836+5925 and PSR J2055+25, both of which are at least 5 and 10 times less energetic, respectively.
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