Hertfordshire Astronomy 2018-2021

赫特福德郡天文学 2018-2021

• 批准号: ST/R000905/1
• 负责人: Martin Hardcastle
• 金额: $ 243.66万
• 依托单位: University of Hertfordshire
• 依托单位国家: 英国
• 项目类别: Research Grant
• 财政年份: 2018
• 资助国家: 英国
• 起止时间: 2018 至 无数据
• 项目状态: 已结题
• 来源: https://gtr.ukri.org/projects?ref=ST%2FR000905%2F1
• 关键词: Hertfordshire; Astronomy; 2018; 2021

The Centre for Astrophysics Research carries out observational programmes spanning the wavelength range from X-ray to radio -- supporting this by computer modelling and simulation. Our research ranges from observations of high-redshift galaxies at long wavelengths through to novel statistical analyses of observations seeking to detect planets outside our Solar System. In between these extremes, we carry out the largest multi-wavelength surveys conducted to date to understand the properties of the Milky Way. Our research makes use of observations from all of the main European and international astronomical observatories, including ground-based observatories at optical, radio and submillimetre wavelengths, and space observatories at wavelengths ranging from the far infrared to X-rays. Computer simulations gives us a better understanding of the physical processes detected in our observations, and we need to apply advanced data-mining techniques to work with the ~terabyte datasets we are generating. Below is a brief description of our research in each of these areas.We perform searches of nearby stars to discover planets, and are world leaders in the application of radial-velocity methods for this purpose; our focus in the grant period will be the planet populations around Sun-like nearby stars. We also discover, follow up and model the properties of the coolest brown dwarfs whose temperatures overlap with those of planets. These studies aim to understand the diversity of the population of brown dwarfs detected with the Gaia satellite and to establish how their modes of formation fit in with those of their brethren of different masses, i.e. heavier (stars) or lighter (planets). The Milky Way is our home galaxy. Material within it, in the form of gas and dust, is the raw material for forming stars and planetary systems. At the end of stellar lives some of this material remains locked up in stellar remnants but much of it is returned in late superwind phases and supernova explosions. The cycle between accretion in youth and outflow in old age enriches the gaseous medium and governs its dynamics, via the thermal and mechanical energy injected into the gas. By using large area imaging surveys, our research looks at how gas, dust and stars within the Milky Way are connected, and at the details of how stars are formed. Our surveys span the optical to radio domains, tracing stars, extinction, molecular clouds, their dust properties and associated star formation.Looking beyond the Milky Way, it is possible to appraise how stars form and evolve in different environments, from small dwarf galaxies to the outer parts of other galaxies like our own. We study the gas content of galaxies, providing the material for star formation, and link what we find to stellar populations and to star forming regions in the full range of local galaxies. By understanding the processes that trigger star formation and stellar evolution in the nearby Universe, we can apply this understanding to the very earliest galaxies and the first generations of stars in the distant Universe. Indeed some of our work focuses on high-redshift galaxies detected with great efficiency at sub-millimetre wavelengths, making use of cutting-edge instruments such as ALMA.A new generation of surveys is mapping out the most distant galaxies, and allows us to investigate what links the processes of star formation and the growth of supermassive black holes. We also use detailed radio and X-ray observations, along with computer modelling, to measure the energy injected by jets ejected from supermassive black holes into distant galaxies and clusters of galaxies, affecting star formation and gas properties, and playing a long-term role in their evolutionary history. The evolution of the chemical elements in these galaxies, and the interplay between black-hole activity and elemental abundances, is a particular focus of this proposal.

天体物理学研究中心执行的观测方案涵盖从X射线到无线电的波长范围，并通过计算机建模和模拟予以支持。我们的研究范围从长波长高红移星系的观测到对观测的新统计分析，以探测太阳系外的行星。在这些极端之间，我们进行了迄今为止最大的多波长调查，以了解银河系的性质。我们的研究利用了欧洲和国际所有主要天文观测台的观测结果，包括光学、无线电和亚毫米波长的地面观测台，以及从远红外到X射线波长的空间观测台。计算机模拟让我们更好地理解在我们的观察中检测到的物理过程，我们需要应用先进的数据挖掘技术来处理我们正在生成的~ TB数据集。下面是我们在每个领域的研究的简要描述。我们执行搜索附近的恒星来发现行星，并且在径向速度方法的应用方面处于世界领先地位;我们在资助期间的重点将是类太阳附近恒星周围的行星种群。我们还发现，跟踪和模拟最冷的褐矮星的性质，其温度与行星的温度重叠。这些研究旨在了解盖亚卫星探测到的褐矮星种群的多样性，并确定它们的形成模式如何与不同质量的兄弟，即较重（恒星）或较轻（行星）的形成模式相适应。银河系是我们的家。其中的物质，以气体和尘埃的形式，是形成恒星和行星系统的原材料。在恒星生命结束时，这些物质中的一部分仍然被锁定在恒星残骸中，但其中大部分在后期的超级风阶段和超新星爆炸中返回。年轻时的吸积和老年时的外流之间的循环丰富了气体介质，并通过注入气体的热能和机械能来控制其动力学。通过使用大面积成像调查，我们的研究着眼于银河系内的气体，尘埃和恒星是如何连接的，以及恒星如何形成的细节。我们的观测范围涵盖了从光学到射电的各个领域，追踪恒星、灭绝、分子云、它们的尘埃特性和相关的星星形成。放眼银河系之外，我们可以评估恒星如何在不同的环境中形成和演化，从小型矮星系到像我们这样的其他星系的外部。我们研究星系的气体含量，为星星的形成提供物质，并将我们的发现与恒星种群和整个局部星系中的星星形成区域联系起来。通过了解触发附近宇宙中星星形成和恒星演化的过程，我们可以将这种理解应用于遥远宇宙中最早的星系和第一代恒星。事实上，我们的一些工作集中在高红移星系的探测上，利用先进的仪器，如ALMA，在亚毫米波长上进行了高效率的探测。新一代的调查正在绘制最遥远的星系，并使我们能够调查星星形成过程和超大质量黑洞生长的联系。我们还使用详细的无线电和X射线观测，沿着计算机建模，来测量从超大质量黑洞喷射到遥远星系和星系团中的喷射流注入的能量，影响星星的形成和气体性质，并在其演化历史中发挥长期作用。这些星系中化学元素的演化，以及黑洞活动和元素丰度之间的相互作用，是这一提议的一个特别重点。

项目成果

An ALMA study of hub-filament systems - I. On the clump mass concentration within the most massive cores

轮毂-细丝系统的 ALMA 研究 - I. 关于最大质量核心内的团块质量集中

• DOI: 10.1093/mnras/stab2674
• 发表时间: 2021
• 期刊: Monthly Notices of the Royal Astronomical Society
• 影响因子: 4.8
• 作者: Anderson M

Variable stars in the VVV globular clusters II. NGC 6441, NGC 6569, NGC 6626 (M 28), NGC 6656 (M 22), 2MASS-GC 02, and Terzan 10

VVV 球状星团 II 中的变星。

• DOI: 10.1051/0004-6361/202140546
• 发表时间: 2021
• 期刊: Astronomy & Astrophysics
• 影响因子: 6.5
• 作者: Alonso-García J

Polarization of hot Jupiter systems: a likely detection of stellar activity and a possible detection of planetary polarization

• DOI: 10.1093/mnras/stab172
• 发表时间: 2021-01
• 作者: J. Bailey;K. Bott;D. Cotton;L. Kedziora-Chudczer;Jinglin Zhao;D. Evensberget;J. Marshall;D. Wright

Elevated r-process Enrichment in Gaia Sausage and Sequoia

• DOI: 10.3847/2041-8213/abdbb8
• 发表时间: 2020-12
• 期刊: The Astrophysical Journal Letters
• 作者: D. Aguado;V. Belokurov;G. Myeong;N. Evans;C. Kobayashi;L. Sbordone;J. Chanamé;C. Navarrete

AGN candidates in the VVV near-IR galaxy catalogue

VVV 近红外星系目录中的 AGN 候选者

• DOI: 10.1093/mnras/stad490
• 发表时间: 2023
• 期刊: Monthly Notices of the Royal Astronomical Society
• 影响因子: 4.8
• 作者: Baravalle L