Astronomy and Astrophysics at Edinburgh

Lead Research Organisation: University of Edinburgh
Department Name: Sch of Physics and Astronomy

Abstract

This grant supports research in astronomy and astrophysics in Edinburgh, which spans processes from cosmological scales of billions of light years, down to the creation of stars, and the formation and evolution of planets and planetary systems. Our research involves observation, theory and numerical simulation, and in particular brings these different aspects together to address some of the most fundamental questions that humans have asked since the dawn of civilisation: what are the origins of the Earth and the objects that we see in the sky at night, and what is our place in the Universe?

Remarkable progress in our understanding has been made over the last few decades. On the largest scales, a standard model for cosmology has emerged, which can explain the expansion history of the Universe and the distribution of matter within it. In this model, only five percent of the Universe is composed of normal 'baryonic' matter - the matter we are familiar with, from which planets and stars are made. The rest is composed of exotic material known as 'dark matter', and a 'dark energy' field which is causing the rate of expansion of the Universe to increase. However, the nature of dark matter and dark energy remain unknown. Our proposed research addresses this, by studying their effects on the large-scale distribution of galaxies, the distortions that they cause to the light reaching us from distant galaxies (a process known as gravitational lensing), and more locally their effect on the distributions and orbits of stars and star clusters in our own and nearby galaxies.

Detailed observations of large samples of galaxies across cosmic time, combined with precision studies of the Milky Way and nearby galaxies, have led to an enhanced understanding of how galaxies form and evolve. Cosmological simulations are able to provide a remarkable match to observations and are providing considerable insight into the physical processes that must be driving galaxy evolution. Nevertheless, we still lack a complete understanding of what regulates star formation in galaxies, and how massive black holes (a million to a billion solar masses) and active galactic nuclei (AGN) form at their centres. Modern theory favours an input of energy from supernovae and AGN to heat and expel gas out of galaxies, but the details are not fully understood. Our research addresses this, through detailed studies of the galaxy population across cosmic time, the black holes within them, and the impact of galaxies and AGN on their gaseous surroundings.

On much smaller scales, it is only just over two decades since the first planet outside our Solar System was detected; more than 4000 of these exoplanets are now known. The remarkable diversity of the population of detected exoplanets, compared to the planets in our own Solar System, is revolutionising our understanding of how planetary systems form, but also opening up many new questions. Our research focusses primarily on simulations of planet formation, and on direct imaging and spectroscopic studies of exoplanets to understand their atmospheres and nature.

Our research in Edinburgh is driven by technological breakthroughs in observational facilities and computing power, and enhanced by novel statistical analysis techniques and new theoretical approaches. During the period of this grant, Edinburgh researchers will lead major new surveys and high-precision measurements at wavelengths across the electromagnetic spectrum from X-rays to radio waves, using ground-based observatories and space-based satellites. Our sophisticated new simulations will provide detailed predictions, to be compared to current and ongoing observational data. We anticipate major progress in our understanding of the full history and structure of our Universe and our place within it.

Planned Impact

We have a strong track record of broader impact from our research, both through knowledge exchange and public engagement, and we will continue to expand these activities building on the research proposed in this grant.

1) Knowledge transfer and exploitation

Much of our research involves new technological developments, including the management and statistical analysis of large datasets, high precision imaging analysis techniques, and the advanced computational and data visualisation techniques required for the production and analysis of our cosmological simulations. Knowledge transfer has long been a core part of our programme, and our knowledge transfer activities have been further enhanced by the opening of the Higgs Centre for Innovation (HCI) at the Royal Observatory in 2018; this joint venture between the University and STFC is a business incubation facility in the 'Big Data' and Space industries, which is currently half-way through its 2-yr ramp up to a full quota of 12 companies. To maximally exploit this opportunity, in recent years we have recruited three new faculty as Chancellors Fellows, with a specific focus on further advancing our knowledge transfer activities in the areas of novel data handling technology, data visualisation, and the Space industry sector. Combined with our Wide Field Astronomy Unit, with its extensive expertise in processing, analysing, combining and archiving enormous datasets, we are very well-placed to build on any opportunities that our research offers for broader impact, and have specific plans in this direction that are outlined in our Pathways to Impact document.

2) Public engagement

Our research is of great public interest, and we have a very strong track record of extensive activities in public engagement, in particular through the Royal Observatory Edinburgh Visitor Centre; this is managed by staff from the UK Astronomy Technology Centre (UK-ATC), but jointly funded by STFC and the University of Edinburgh, and implemented using volunteer effort from staff and students across the IfA and the UK-ATC. We undertake a large and vigorous programme that draws directly on the cutting-edge research supported by our STFC Consolidated grant. Activities include weekly winter talks, observing evenings, adult 'continuing-education' certificated evening courses, the 'ask an Astronomer' phone line, School visits, the development and operation of the Dark Sky Park programme, and the development of educational resources for teachers. The annual 'Open Doors' event attracted over 3000 visitors in 2019, and each year the overall Visitor Centre programme directly reaches nearly 2,500 schoolchildren through many tens of school visits, and around 9,000 members of the public. More widely, the Visitor Centre, with large contributions from IfA staff, took part in the creation of resources and delivery of events for a national public engagement campaign around the James Webb Space Telescope which has to date reached over 30,000 schoolchildren. Members of IfA also engage in many one-off activities including numerous public lectures, media engagements and actively promoting press coverage of our research. We intend to continue all of these activities through the forthcoming grant period, building directly on the proposed research. A particular highlight of our proposed future programme is the development and delivery of new planetarium shows, based on our consolidated grant research, taking advantage of a new planetarium system purchased by the Institute for Astronomy, and in partnership with Dynamic Earth.

Publications

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Title 144MHz radio fluxes of z>5 quasars 
Description VizieR online Data Catalogue associated with article published in journal Astronomy & Astrophysics with title 'Low frequency radio properties of the z > 5 quasar population.' (bibcode: 2021A&A...656A.137G) 
Type Of Material Database/Collection of data 
Year Produced 2021 
Provided To Others? Yes  
Impact First characaterisation of radio properties of the very highest redshift quasars. 
URL https://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/656/A137
 
Title LOFAR Two-metre Sky Survey (LoTSS) DR2 
Description VizieR online Data Catalogue associated with article published in journal Astronomy & Astrophysics with title 'The LOFAR Two-metre Sky Survey (LoTSS). V. Second data release.' (bibcode: 2022A&A...659A...1S) 
Type Of Material Database/Collection of data 
Year Produced 2022 
Provided To Others? Yes  
Impact This catalogue has been very widely used, with currently over 100 citations per year. 
URL https://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/659/A1
 
Title LoLSS-Deep Bootes 54MHz catalog 
Description VizieR online Data Catalogue associated with article published in journal Astronomy & Astrophysics with title 'The LOFAR LBA Sky Survey: Deep Fields I. The Bootes Field.' (bibcode: 2021A&A...655A..40W) 
Type Of Material Database/Collection of data 
Year Produced 2021 
Provided To Others? Yes  
Impact Deepest ever radio source catalogue at <60MHz. 
URL https://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/655/A40
 
Title The LOFAR Two-Metre Sky Survey (LoTSS): VI. Optical identifications for the second data release 
Description The second data release of the LOFAR Two-Metre Sky Survey (LoTSS) covers 27% of the northern sky, with a total area of $\sim 5,700$ deg$^2$. The high angular resolution of LOFAR with Dutch baselines (6 arcsec) allows us to carry out optical identifications of a large fraction of the detected radio sources without further radio followup; however, the process is made more challenging by the many extended radio sources found in LOFAR images as a result of its excellent sensitivity to extended structure. In this paper we present source associations and identifications for sources in the second data release based on optical and near-infrared data, using a combination of a likelihood-ratio cross-match method developed for our first data release, our citizen science project Radio Galaxy Zoo: LOFAR, and new approaches to algorithmic optical identification, together with extensive visual inspection by astronomers. We also present spectroscopic or photometric redshifts for a large fraction of the optical identifications. In total 4,116,934 radio sources lie in the area with good optical data, of which 85% have an optical or infrared identification and 58% have a good redshift estimate. We demonstrate the quality of the dataset by comparing it with earlier optically identified radio surveys. This is by far the largest ever optically identified radio catalogue, and will permit robust statistical studies of star-forming and radio-loud active galaxies. 
Type Of Material Database/Collection of data 
Year Produced 2023 
Provided To Others? Yes  
Impact Optical IDs for several million radio sources 
URL https://arxiv.org/abs/2309.00102
 
Description ROE Open Weekends and other ROE visitor centre activities 
Form Of Engagement Activity Participation in an open day or visit at my research institution
Part Of Official Scheme? No
Geographic Reach Regional
Primary Audience Public/other audiences
Results and Impact Open weekend at Royal Observatory. Annual event, attracting up to 3000 people. IfA staff and postdoc present research, including funded from this grant. Feedback is excellent.
Additional engagement in other ROE Visitor Centre activities such as 'Astronomy for All' talk series (which reach hundreds of people), and school visits. The ROE Visitor Centre programme directly reaches around 9,000 members of the public annually, including nearly 2,500 schoolchildren through many tens of school visits.
Year(s) Of Engagement Activity 2021,2022,2023,2024
URL https://www.eventbrite.com/cc/public-events-at-royal-observatory-edinburgh-1008419