论文标题
在低频（25-80〜MHz）的国际Lofar站FR606观察到的脉冲星人口的人口普查（25-80〜MHz）
A census of the pulsar population observed with the international LOFAR station FR606 at low frequencies (25-80~MHz)
论文作者
论文摘要
迄今为止，仅检测到100 MHz的脉冲无线电发射，仅鉴定出69个脉冲星。 LAFAR核心的LBA人口普查和NançayLofar站的专门运动在2014年$ - $ 2017进行了独立模式，以便在此频率范围内扩展已知的人群。在本文中，我们旨在以低频扩展已知无线电脉冲星的样本，并在25-80 MHz的频率范围内生成目录。这将使未来的研究能够探究局部银河脉冲星人群，除了帮助解释其发射机制，更好地表征光谱中的低频周转率，并通过研究分散，散射和闪烁来获得有关星际介质的新信息。我们观察到了102个脉冲星，这些脉冲星已散发出低于200 MHz的无线电脉冲，并且在\ si {-30} {\ guger}上方偏斜。我们以独立模式使用了低频阵列（Lofar）国际电台的低频阵列（Lofar）国际站FR606的低带天线（LBA），记录了25-80 MHz之间的数据。补充了一些其他候选人。在我们的102个脉冲星样品中，我们发现了64个。我们证实了第一次被Lofar lba人口普查检测到的十个脉冲星存在，这是第一次被Lofar lba Census检测到的，\ citep {bilous_lofar_2019}，我们添加了在此频率范围内从未检测到过的另外两个脉冲星。我们提供了平均脉冲曲线，DM值和平均通量密度（或非检测的上限）。与先前发表的结果的比较使我们能够确定五个脉冲星的迄今未知光谱周转，这证实了光谱失误是广泛现象的期望。
To date, only 69 pulsars have been identified with a detected pulsed radio emission below 100 MHz. A LOFAR-core LBA census and a dedicated campaign with the Nançay LOFAR station in stand-alone mode were carried out in the years 2014$-$2017 in order to extend the known population in this frequency range. In this paper, we aim to extend the sample of known radio pulsars at low frequencies and to produce a catalogue in the frequency range of 25-80 MHz. This will allow future studies to probe the local Galactic pulsar population, in addition to helping explain their emission mechanism, better characterising the low-frequency turnover in their spectra, and obtaining new information about the interstellar medium through the study of dispersion, scattering, and scintillation. We observed 102 pulsars that are known to emit radio pulses below 200 MHz and with declination above \SI{-30}{\degree}. We used the the Low Band Antennas (LBA) of the LOw Frequency ARray (LOFAR) international station FR606 at the Nançay Radio Observatory in stand-alone mode, recording data between 25-80 MHz. complemented with a few additional candidates. Out of our sample of 102 pulsars, we detected 64. We confirmed the existence of ten pulsars detected below 100 MHz by the LOFAR LBA census for the first time \citep{bilous_lofar_2019} and we added two more pulsars that had never before been detected in this frequency range. We provided average pulse profiles, DM values, and mean flux densities (or upper limits in the case of non-detections). The comparison with previously published results allows us to identify a hitherto unknown spectral turnover for five pulsars, confirming the expectation that spectral turnovers are a widespread phenomenon.
