Parkes observations for project P985 semester 2019APRS_03

We propose to use the ultra-wide-bandwidth, low frequency receiver installed at the Parkes telescope in order to quantify the broad-band intermittency time scale, polarization, quasi-periodicities, and mode changing of a newly discovered pulsar, PSR J1926-0653. The pulsar is unique in its emission properties. It has multiple pulse components, that change with time (both mode- changing and sub-pulse drifting phenomena are evident). The pulsar exhibits nulls in which a few individual pulses seem to be missing. It also exhibits longer-scale (hour-scale) intermittency behaviour in which the emission switches off for long periods of time. The pulse flux densities often, but not always, seem to exhibit quasi-periodic variations. Clearly this pulsar may hold the key to many different emission phenomena and we request time on Parkes, FAST and ATCA to parameterise the pulsar and its emission properties in detail.

本研究计划采用安装于帕克斯望远镜（Parkes telescope）的超宽带宽低频接收机，对新发现的脉冲星PSR J1926-0653的宽带间歇性时间尺度、偏振特性、准周期性以及模式切换行为开展定量分析。该脉冲星的辐射特性独具一格：其包含多个随时间演化的脉冲成分，其中模式切换与亚脉冲漂移现象均已得到观测证实。该脉冲星存在脉冲消隐现象，即部分独立脉冲出现缺失；同时还表现出小时级长时标的间歇性行为，辐射会在较长时段内中断。其脉冲流量密度往往，但并非总是，呈现准周期性变化。显然，该脉冲星或为破解诸多辐射物理现象的关键线索，因此我们申请使用帕克斯望远镜、500米口径球面射电望远镜（Five-hundred-meter Aperture Spherical radio Telescope，FAST）以及澳大利亚望远镜致密阵列（Australia Telescope Compact Array，ATCA）的观测时间，以对该脉冲星及其辐射特性展开详尽的参数化研究。