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Zooming in on feedback in active galaxies: the first high-resolution radio survey

放大活跃星系的反馈：第一次高分辨率射电勘测

基本信息

批准号：
MR/T042842/1
负责人：
Leah Morabito
金额：
$ 101.89万
依托单位：
Durham University
依托单位国家：
英国
项目类别：
Fellowship
财政年份：
2020
资助国家：
英国
起止时间：
2020 至无数据
项目状态：
未结题

来源：
https://gtr.ukri.org/projects?ref=MR%2FT042842%2F1
关键词：
Zooming feedback active galaxies first

项目摘要

A super-massive black hole exists at the centre of almost every massive galaxy, but what role do they play in galaxy evolution? In about 10 percent of all galaxies, we observe energetic phenomena like outflows and jets of plasma that are powered by these black holes. When a galaxy shows these characteristics we call it an active galaxy, and refer to the black hole and its energetic ouput as an active galactic nucleus (AGN). We know from both observations and cosmological simulations that feedback between an AGN and its host galaxy can have a significant impact on that galaxy's evolution. What we do not know are the details of how this AGN feedback works. Current AGN feedback studies rely on indirect evidence and focus on individual objects or small samples. It can be extremely difficult to tell the difference between star formation, which is how galaxies normally grow, and AGN activity. High resolution imaging can help, and at radio wavelengths this alone is enough to clearly distinguish between AGN activity and star formation. Traditionally radio telescopes with high enough resolution to do this have tiny fields of view which limits studies to small numbers of galaxies. The advent of next-generation of low-frequency radio telescopes offers a new and exciting way to overcome this challenge. This relies on combining both wide-field and high-resolution capabilities of the LOw Frequency ARray (LOFAR), using techniques I have developed. LOFAR is a Square Kilometre Array (SKA) pathfinder with antennas spread all across Europe. Default operations use only the antennas centred in the Netherlands, but I have developed a high-resolution imaging data pipeline to combine signals from all the antennas in the array, providing a larger effective 'lens' and 20 times improved resolution. My high-resolution work is opening a new regime for radio surveys, and I hold the record for the highest resolution image ever made below 100 MHz (just below the FM radio band). My ambitious and exciting UKRI FLF project is to conduct the first high-resolution survey across the entire Northern sky, which will allow me to study the physical processes by which AGN produce radio emission, what properties govern these processes across large samples of galaxies, and how these processes impact the typical growth of galaxies through star formation. This survey will build from smaller datasets on interesting areas of sky with exquisite coverage across radio, infrared, optical, and X-ray wavelengths, and eventually cover the entire Northern sky. I will drive forward major advances in AGN feedback studies with my UKRI-FLF project, and push the field to new and exciting territory in answering fundamental astrophysical questions. Dealing with such large data volumes will feed into the general trend for developing tools and techniques to deal with Big Data. I will exploit opportunities for interdisciplinary science, including working with computer scientists to develop new algorithms for identifying and classifying the radio emission from AGN in large surveys. In the next few years, my work will lay the foundation for future scientific surveys with the SKA, in which the UK has already invested £119 million. I will build international collaborations with SKA pathfinder teams in South Africa, the Netherlands, and place Durham and the UK at the forefront of this exciting new revolution in science.

几乎每个大质量星系的中心都存在一个超大质量黑洞，但它们在星系演化中扮演了什么角色？在大约10%的星系中，我们观察到由黑洞提供能量的等离子体流出和喷射等高能现象。当一个星系表现出这些特征时，我们称之为活动星系，并将黑洞及其能量输出称为活动星系核（AGN）。我们从观测和宇宙学模拟中都知道，AGN与其宿主星系之间的反馈可以对该星系的演化产生重大影响。我们不知道的是AGN反馈是如何工作的细节。目前的AGN反馈研究依赖于间接证据，并侧重于单个对象或小样本。区分恒星形成和AGN活动是非常困难的，恒星形成是星系正常生长的方式。高分辨率成像可以提供帮助，仅在无线电波长上就足以清楚地区分AGN活动和恒星形成。传统的分辨率足够高的射电望远镜的视野很小，这限制了对少数星系的研究。下一代低频射电望远镜的出现为克服这一挑战提供了一种令人兴奋的新方法。这依赖于结合低频阵列（LOFAR）的宽视场和高分辨率能力，使用我开发的技术。LOFAR是一个平方公里阵列（SKA）探路者，其天线遍布整个欧洲。默认操作仅使用以荷兰为中心的天线，但我开发了一种高分辨率成像数据管道，将来自阵列中所有天线的信号组合在一起，提供更大的有效“镜头”和20倍的分辨率提高。我的高分辨率工作为无线电调查开辟了一个新的制度，我保持着100兆赫以下（刚好低于调频无线电频段）的最高分辨率图像的记录。我的雄心勃勃和令人兴奋的UKRI FLF项目是在整个北方天空进行第一次高分辨率调查，这将使我能够研究AGN产生无线电发射的物理过程，在大型星系样本中控制这些过程的特性，以及这些过程如何通过恒星形成影响星系的典型增长。这项调查将从较小的数据集建立在有趣的天空区域，通过无线电，红外，光学和x射线波长进行精细覆盖，最终覆盖整个北方天空。我将通过我的UKRI-FLF项目推动AGN反馈研究的重大进展，并将该领域推向新的令人兴奋的领域，以回答基本的天体物理学问题。处理如此大的数据量将成为开发处理大数据的工具和技术的大趋势。我将利用跨学科科学的机会，包括与计算机科学家合作开发新的算法，用于在大型调查中识别和分类AGN的无线电发射。在接下来的几年里，我的工作将为SKA未来的科学调查奠定基础，英国已经在SKA上投资了1.19亿英镑。我将与南非、荷兰的SKA探路者团队建立国际合作，并将达勒姆和英国置于这一激动人心的科学新革命的前沿。

项目成果

期刊论文数量（10）

专著数量（0）

科研奖励数量（0）

会议论文数量（0）

专利数量（0）

A Quick Look at the 3 GHz Radio Sky. II. Hunting for DRAGNs in the VLA Sky Survey

DOI：
10.3847/1538-4365/acda30
发表时间：
2023-03
期刊：
The Astrophysical Journal Supplement Series
影响因子：
0
作者：
Y. Gordon;L. Rudnick;H. Andernach;L. Morabito;C. O’Dea;Kaylan-Marie Achong;S. Baum;Caryelis Bayona-Figueroa;E. Hooper;B. Mingo;M. E. Morris;A. Vantyghem
通讯作者：
Y. Gordon;L. Rudnick;H. Andernach;L. Morabito;C. O’Dea;Kaylan-Marie Achong;S. Baum;Caryelis Bayona-Figueroa;E. Hooper;B. Mingo;M. E. Morris;A. Vantyghem

Fundamental differences in the properties of red and blue quasars: measuring the reddening and accretion properties with X-shooter

DOI：
10.1093/mnras/stac945
发表时间：
2022-01
期刊：
Monthly Notices of the Royal Astronomical Society
影响因子：
4.8
作者：
V. A. Fawcett;D. Alexander;D. Rosario;L. Klindt;E. Lusso;L. Morabito;G. Rivera
通讯作者：
V. A. Fawcett;D. Alexander;D. Rosario;L. Klindt;E. Lusso;L. Morabito;G. Rivera

High-resolution imaging with the International LOFAR Telescope: Observations of the gravitational lenses MG 0751+2716 and CLASS B1600+434

使用国际 LOFAR 望远镜进行高分辨率成像：引力透镜 MG 0751 2716 和 CLASS B1600 434 的观测