Galaxy-scale jets with new extragalactic radio surveys

银河级喷射机与新的河外无线电勘测

• 批准号: 1947458
• 金额: --
• 依托单位: The Open University
• 依托单位国家: 英国
• 项目类别: Studentship
• 财政年份: 2017
• 资助国家: 英国
• 起止时间: 2017 至 无数据
• 项目状态: 已结题
• 来源: https://gtr.ukri.org/projects?ref=studentship-1947458
• 关键词: Galaxy; scale; jets; new; extragalactic

Extragalactic jets from supermassive black holes are known to play an important role in the process of how galaxies evolve. Research in this area over the last decade has focused particularly on powerful jets in the centres of rich galaxy clusters, where jets appear to regulate star formation in massive galaxies - a process now incorporated into most cosmological simulations of galaxy formation. But smaller jets contained within their host galaxies can also have a powerful effect on the scale of individual galaxies, as we have found from recent X-ray studies measuring the impact of their shocks (e.g. Croston et al. 2007, 2009, Mingo et al. 2011, 2012, Heesen et al. 2014). Their low radio luminosity and small size mean that these jets have been difficult to identify in previous radio surveys. For this reason, the demographics of the population, and the role of these small-scale jets in the high-redshift Universe, are not understood. Similarly, direct measurements of their impact via X-ray follow up have only been possible for a handful of objects.This project will involve exploiting new low-frequency surveys of the extragalactic sky with LOFAR (the Low-Frequency Array), which have the sensitivity, resolution and image fidelity to identify and characterize galaxy-scale jets. By cross-matching this population with data at other wavelengths, it will be possible to answer questions about how common they are, and how their radio properties relate to their black hole mass, accretion behaviour and environment. There is also the possibility to work on new and archival X-ray observations to measure shock properties in individual objects.

众所周知，来自超级质量黑洞的外乳流喷射在星系如何发展的过程中起着重要作用。在过去十年中，该领域的研究特别集中在丰富的星系簇中心的强大喷气机上，在那里喷气机似乎调节了巨大的星系中的恒星形成 - 现在，这一过程纳入了大多数宇宙学的星系构造中。但是，正如我们最近的X射线研究中发现的，托管星系中包含的较小喷气机也可以对单个星系的规模产生强大的影响（例如，Croston等，2007，2009； Mingo等人2011，2011，2011，Heesen等人，2014年）。它们的低无线电发光度和小尺寸意味着这些喷气机在先前的无线电调查中很难识别。因此，尚不清楚人口的人口统计以及这些小规模喷气机在高红移宇宙中的作用。 Similarly, direct measurements of their impact via X-ray follow up have only been possible for a handful of objects.This project will involve exploiting new low-frequency surveys of the extragalactic sky with LOFAR (the Low-Frequency Array), which have the sensitivity, resolution and image fidelity to identify and characterize galaxy-scale jets.通过与其他波长的数据交叉匹配，可以回答有关它们的常见程度以及其无线电性能与黑洞质量，积聚行为和环境的关系。还可以进行新的和档案X射线观察以测量单个对象中的冲击特性。