PATT travel grant support for Bristol Astrophysics and Planetary Studies

Lead Research Organisation: University of Bristol
Department Name: Physics

Abstract

The Bristol Astrophysics and Planetary Studies groups work on programmes that require careful observations to be made using the world's largest telescopes. This proposal requests two years of funding for travel to those telescopes, to allow observing on projects that cannot be run remotely.

In studies of the microwave background radiation, the left-over radiation from the Big Bang, it is important to remove contamination from foreground sources of emission that confuse our measurements of the background itself. These emission sources are radio galaxies and quasars, which may be much brighter than the radiation itself. Removal of this contamination requires sensitive observations of the radio environments of our target fields using large radio telescopes in the USA and elsewhere. Many of the effects that we are looking for relate to the "shadows" cast on the background radiation by the gas in clusters of galaxies. We then also need to study those clusters with optical and infra-red telescopes, to measure the cluster masses, and to gain insights into how clusters form and change over the history of the Universe.

Our work on active galaxies, which host supermassive black holes in their nuclei, is principally done using orbiting X-ray telescopes, but to understand the physics of the emission it is essential also to map the galaxies in the radio, infra-red, and optical bands. Here again Group members make extensive use of large ground-based telescopes, particularly the VLA in the USA, the ATCA in Australia, and ESO's large telescopes in Chile. A major aim of this work is to understand how active galaxies pump energy into gas in the Universe, helping to keep the gas between the galaxies hot.

Small-scale models of those active galaxies can be found in our own Galaxy, in black hole systems with masses a few times the mass of the Sun. Work on these systems is done in the same way as for the active galaxies, but with the extra need to observe the systems repeatedly to follow their rapid changes in brightness and structure. From such information we can discover how matter behaves near black holes.

A unifying thread of our work is the investigation into how the stucture of the Universe forms and changes with time. A large fraction of our observing is therefore dedicated to finding and characterizing the earliest galaxies and clusters, and then seeing how these systems differ from their older counterparts that lie closer to us. Again, we have to use a wide range of ground-based telescopes for this work, from the radio to the optical. Much of the optical work is done with the ESO telescopes in Chile. The corresponding radio work, to detect mm-wave lines from cold gas, often uses the ATCA in Australia, or the GBT in the USA.

Nearby galaxies can be studied in more detail than more distant ones, and we also look at the changing populations of galaxies in different environments or at different redshifts. We are particularly interested in galaxies of the lowest mass, which are the most common, but which have properties that are both poorly understood and rather different from galaxies like our own.

We also study our own Galaxy, looking at the gas between the stars, which has been heated by supernovae or young stars, and at the dense lumps of gas that emit coherent (maser) radiation. The gas motions tell us about how processes in the Galaxy continually recycle its gas, and can be used to measure the distances of objects within our Galaxy.

Finally, we seek to understand the properties of the atmospheres of planets and large satellites in our solar system - the formation and evolution can be studied by detailed spectroscopy, which we undertake using large ground-based telescopes such as the IRTF.

Publications

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Davies L (2014) Identifying clustering at high redshift through actively star-forming galaxies in Monthly Notices of the Royal Astronomical Society

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Davies L (2013) The detection of FIR emission from high-redshift star-forming galaxies in the ECDF-S in Monthly Notices of the Royal Astronomical Society

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Geach J (2017) The SCUBA-2 Cosmology Legacy Survey: 850 µm maps, catalogues and number counts in Monthly Notices of the Royal Astronomical Society

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Husband K (2013) Are z ~ 5 quasars found in the most massive high-redshift overdensities?? in Monthly Notices of the Royal Astronomical Society

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Michalowski M (2017) The SCUBA-2 Cosmology Legacy Survey: the nature of bright submm galaxies from 2 deg2 of 850-µm imaging in Monthly Notices of the Royal Astronomical Society

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Robotham A (2012) Galaxy And Mass Assembly (GAMA): in search of Milky Way Magellanic Cloud analogues GAMA: in search of MMAs in Monthly Notices of the Royal Astronomical Society

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Robotham A (2013) Galaxy And Mass Assembly (GAMA): the life and times of L? galaxies in Monthly Notices of the Royal Astronomical Society

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Roseboom I (2013) The SCUBA-2 Cosmology Legacy Survey: demographics of the 450-µm population in Monthly Notices of the Royal Astronomical Society

 
Description PATT Linked Grant
Amount £10,000 (GBP)
Funding ID ST/M00208X/1 
Organisation Science and Technologies Facilities Council (STFC) 
Sector Academic/University
Country United Kingdom
Start 10/2014 
End 09/2016
 
Description Public lectures and science cafes 
Form Of Engagement Activity A talk or presentation
Part Of Official Scheme? No
Geographic Reach Regional
Primary Audience Public/other audiences
Results and Impact Multiple public talks to astronomy societies and other organisations, also Science Cafes and other groups (e.g., Anglo-Polish society).

Activities tended to go on to time limit because of question-and-answer sessions, and have generated eMail questions after the fact from attendees. Continued requests for talks and other contacts based on experiences.
Year(s) Of Engagement Activity 2006,2007,2008,2009,2010