论文标题
雷达脉冲星的日食研究J1227 $ - $ 4853
Study of eclipses for Redback pulsar J1227$-$4853
论文作者
论文摘要
我们提出了一项多频研究,对过渡性闪烁的毫秒脉冲星J1227 $ - $ 4853在2014年使用GMRT发现。该脉冲星的排放量为607 MHz,约为其围绕上部连接的37%的轨道。我们观察到日食的进口和出口过渡,分别持续了其轨道的12%和15%,导致只有36%的轨道不受黯然失色的材料影响。我们报告了Eclipse边界上的多余色散度量(DM),为0.079(3)PC CM $^{ - 3} $,相应的电子柱密度(N $ _e $)为24.4(8)x 10 $^{16} $ cm $ $ $ $ $^{ - 2} $。同时定时和成像研究表明,J1227 $ - $ 4853中的日食不是由于过量的分散和散射引起的时间涂抹引起的,但可能是由于脉冲信号所引起的pulsar通量导致的脉冲信号所引起的。另外,在轨道相0.71和0.82处接近下部连接,脉冲发射显着延迟,这与脉冲和连续通量密度的褪色有关。在轨道阶段$ \ sim $ 0.82处,我们测量的DM的更改为0.035(3)PC CM $^{ - 3} $和N $ _e $ of 10.8(8)x 10 $^{16} $ cm $^{ - 2} $ ape $ \ sim $ \ sim $ 30%peaper peak flux flux denterive a dimming相关。没有报道其他黯然失色的二进制文件围绕固定轨道相逐渐褪色的通量。此外,围绕下等连接的事件可能是由于脉冲信号的吸收而引起的,该脉冲信号是通过通过L2 Lagrangian Point从质量损失产生的等离子体的碎片斑点引起的。
We present a multi-frequency study of eclipse properties of a transitional redback millisecond pulsar J1227$-$4853 discovered in 2014 with the GMRT. Emission from this pulsar is eclipsed at 607 MHz for about 37% of its orbit around the superior conjunction. We observe eclipse ingress and egress transition which last 12% and 15% of its orbit respectively, resulting in only 36% of the orbit being unaffected by eclipsing material. We report an excess dispersion measure (DM) at eclipse boundaries of 0.079(3) pc cm$^{-3}$ and the corresponding electron column density (N$_e$) is 24.4(8) x 10$^{16}$ cm$^{-2}$. Simultaneous timing and imaging studies suggests that the eclipses in J1227$-$4853 are not caused by temporal smearing due to excess dispersion and scattering but could be caused by removal of pulsar flux due to cyclotron absorption of the pulsed signal by intra-binary material constraining the companion's magnetic field. Additionally, near inferior conjunction at orbital phase 0.71 and 0.82 the pulsed emission is significantly delayed which is associated with a fading of the pulsed and continuum flux densities. At orbital phase $\sim$0.82, we measure a change in DM of 0.035(3) pc cm$^{-3}$ and N$_e$ of 10.8(8) x 10$^{16}$ cm$^{-2}$ associated with a dimming of up to $\sim$30% of the peak flux density. Such flux fading around a fixed orbital phase is not reported for other eclipsing binaries. Moreover, this event around inferior conjunction could be caused by absorption of pulsed signal by fragmented blobs of plasma generated from mass loss through the L2 Lagrangian point.