Accretion, Structure and Evolution in Gravitating Systems
Lead Research Organisation:
University of Leicester
Department Name: Physics and Astronomy
Abstract
We propose to undertake a broad programme of research in theoretical astrophysics. This research will be centered around accretion, structure and evolution in many astrophysical systems. Accretion is the process whereby a massive, gravitating body accumulates mass from its surroundings. As the mass falls towards the body it can give up energy in the form of heat and light. Accretion onto a black hole is the most efficient way of extracting energy from normal matter. Astrophysical systems powered by accretion are among the luminous in the universe. Gravity not only powers these systems but determines their large-scale structure and long term evolution. The systems we aim to study cover many length scales, from compact binary star systems which would happily fit inside the Sun to colliding galaxies which consist of many billions of Sun-like stars. We will investigate the nature of the non-luminous, dark matter which constitutes about 90 per cent of the mass of our Galaxy, the Milky Way. Our work will also improve our understanding of how the Milky Way was formed and how it has slowly changed over the past 10 billion years.
Publications
Pasetto S
(2010)
Isolated dwarf galaxies: from cuspy to flat dark matter density profiles and metalicity gradients
in Astronomy and Astrophysics
Adén D
(2010)
An abundance study of red-giant-branch stars in the Hercules dwarf spheroidal galaxy
in Astronomy & Astrophysics
Nayakshin S
(2010)
Simulations of momentum feedback by black hole winds
in Monthly Notices of the Royal Astronomical Society
Nayakshin S
(2010)
Formation of planets by tidal downsizing of giant planet embryos
in Monthly Notices of the Royal Astronomical Society: Letters
Schönrich R
(2010)
Local kinematics and the local standard of rest
in Monthly Notices of the Royal Astronomical Society
Ural U
(2010)
Kinematic subpopulations in dwarf spheroidal galaxies
in Monthly Notices of the Royal Astronomical Society
Norris J
(2010)
CHEMICAL ENRICHMENT IN THE FAINTEST GALAXIES: THE CARBON AND IRON ABUNDANCE SPREADS IN THE BOÖTES I DWARF SPHEROIDAL GALAXY AND THE SEGUE 1 SYSTEM
in The Astrophysical Journal
Fabbiano G
(2010)
FIELD AND GLOBULAR CLUSTER LOW-MASS X-RAY BINARIES IN NGC 4278
in The Astrophysical Journal
Brassington N
(2010)
THE X-RAY SPECTRA OF THE LUMINOUS LMXBs IN NGC 3379: FIELD AND GLOBULAR CLUSTER SOURCES
in The Astrophysical Journal
King A
(2010)
AGN have underweight black holes and reach Eddington
in Monthly Notices of the Royal Astronomical Society: Letters
Cullen L
(2010)
Inviscid smoothed particle hydrodynamics Inviscid smoothed particle hydrodynamics
in Monthly Notices of the Royal Astronomical Society
Nayakshin S
(2010)
Grain sedimentation inside giant planet embryos Grain sedimentation in giant embryos
in Monthly Notices of the Royal Astronomical Society
Cha S
(2010)
Kelvin-Helmholtz instabilities with Godunov smoothed particle hydrodynamics
in Monthly Notices of the Royal Astronomical Society
Actis M
(2011)
Design concepts for the Cherenkov Telescope Array CTA: an advanced facility for ground-based high-energy gamma-ray astronomy
in Experimental Astronomy
Walker M
(2011)
DARK MATTER IN THE CLASSICAL DWARF SPHEROIDAL GALAXIES: A ROBUST CONSTRAINT ON THE ASTROPHYSICAL FACTOR FOR ?-RAY FLUX CALCULATIONS
in The Astrophysical Journal
Hobbs A
(2011)
Feeding supermassive black holes through supersonic turbulence and ballistic accretion Feeding SMBHs through supersonic turbulence
in Monthly Notices of the Royal Astronomical Society
Nayakshin S
(2011)
Rotation of the Solar system planets and the origin of the Moon in the context of the tidal downsizing hypothesis
in Monthly Notices of the Royal Astronomical Society: Letters
Power C
(2011)
The accretion disc particle method for simulations of black hole feeding and feedback The accretion disc particle method
in Monthly Notices of the Royal Astronomical Society
Cioni M
(2011)
The VMC survey I. Strategy and first data
in Astronomy & Astrophysics
Koposov S
(2011)
ACCURATE STELLAR KINEMATICS AT FAINT MAGNITUDES: APPLICATION TO THE BOÖTES I DWARF SPHEROIDAL GALAXY
in The Astrophysical Journal
Nixon C
(2011)
The final parsec problem: aligning a binary with an external accretion disc Disc-binary alignment
in Monthly Notices of the Royal Astronomical Society: Letters
King A. R.
(2011)
Large-scale outflows in galaxies
in MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
Ham Byoung S.
(2011)
Inversion-free, noiseless Raman echoes
in arXiv e-prints
Assmann P
(2011)
Star cluster collisions - a formation scenario for the extended globular cluster Scl-dE1 GC1 Formation scenario for Scl-dE1 GC1
in Monthly Notices of the Royal Astronomical Society
Alexander R
(2011)
Disc instability in RS Ophiuchi: a path to Type Ia supernovae RS Oph and Type Ia SNe
in Monthly Notices of the Royal Astronomical Society
Kuulkers E
(2011)
Secular changes in the quiescence of WZ Sagittae: the development of a cavity in the inner disk
in Astronomy & Astrophysics
Power C
(2011)
Self-regulated star formation and the black hole-galaxy bulge relation SMBH-bulge relation
in Monthly Notices of the Royal Astronomical Society: Letters
Nixon C
(2011)
Retrograde accretion and merging supermassive black holes Retrograde inflow and merging SMBH
in Monthly Notices of the Royal Astronomical Society
Bloom JS
(2011)
A possible relativistic jetted outburst from a massive black hole fed by a tidally disrupted star.
in Science (New York, N.Y.)
Zubovas K
(2011)
The Milky Way's Fermi bubbles: echoes of the last quasar outburst? The Milky Way's quasar outburst
in Monthly Notices of the Royal Astronomical Society: Letters
Dehnen W
(2011)
N-body simulations of gravitational dynamics
in The European Physical Journal Plus
Cole D
(2011)
Weakening dark matter cusps by clumpy baryonic infall Weakening dark matter cusps by baryonic infall
in Monthly Notices of the Royal Astronomical Society
King A
(2011)
THE BRIGHTEST CLUSTER X-RAY SOURCES
in The Astrophysical Journal
Charbonnier A
(2011)
Dark matter profiles and annihilation in dwarf spheroidal galaxies: prospectives for present and future ?-ray observatories - I. The classical dwarf spheroidal galaxies ?-ray from dark matter annihilation in dSphs
in Monthly Notices of the Royal Astronomical Society
Roberts T
(2012)
A VARIABLE ULTRALUMINOUS X-RAY SOURCE IN A GLOBULAR CLUSTER IN NGC 4649
in The Astrophysical Journal
Strader J
(2012)
DEEP CHANDRA MONITORING OBSERVATIONS OF NGC 4649. II. WIDE-FIELD HUBBLE SPACE TELESCOPE IMAGING OF THE GLOBULAR CLUSTERS
in The Astrophysical Journal
Cole D
(2012)
The mass distribution of the Fornax dSph: constraints from its globular cluster distribution The mass distribution of the Fornax dSph
in Monthly Notices of the Royal Astronomical Society
Farihi J
(2012)
Scars of intense accretion episodes at metal-rich white dwarfs Intense metal accretion at white dwarfs
in Monthly Notices of the Royal Astronomical Society
Zubovas K
(2012)
CLEARING OUT A GALAXY
in The Astrophysical Journal
Casewell S
(2012)
WD0837+185: THE FORMATION AND EVOLUTION OF AN EXTREME MASS-RATIO WHITE-DWARF-BROWN-DWARF BINARY IN PRAESEPE
in The Astrophysical Journal
Minchev I
(2012)
Radial migration does little for Galactic disc thickening
in Astronomy & Astrophysics
Zubovas K
(2012)
Sgr A* flares: tidal disruption of asteroids and planets? Sgr A* flares: tidal disruption of asteroids?
in Monthly Notices of the Royal Astronomical Society
Nixon C
(2012)
Broken discs: warp propagation in accretion discs Broken discs
in Monthly Notices of the Royal Astronomical Society
Nichols J
(2012)
ORIGIN OF ELECTRON CYCLOTRON MASER INDUCED RADIO EMISSIONS AT ULTRACOOL DWARFS: MAGNETOSPHERE-IONOSPHERE COUPLING CURRENTS
in The Astrophysical Journal
Zubovas K
(2012)
Fermi bubbles in the Milky Way: the closest AGN feedback laboratory courtesy of Sgr A*? Fermi bubbles: Sgr A* AGN feedback?
in Monthly Notices of the Royal Astronomical Society
Dehnen W
(2012)
Improving convergence in smoothed particle hydrodynamics simulations without pairing instability SPH without pairing instability
in Monthly Notices of the Royal Astronomical Society
Nixon C
(2012)
Rapid AGN accretion from counter-rotating discs Rapid accretion
in Monthly Notices of the Royal Astronomical Society
Zubovas K
(2012)
The M -s relation in different environments The M -s relation in different environments
in Monthly Notices of the Royal Astronomical Society
Tanvir N
(2012)
The structure of star clusters in the outer halo of M31 Halo star clusters of M31
in Monthly Notices of the Royal Astronomical Society
Nayakshin S
(2012)
THE OBSERVED M -s RELATIONS IMPLY THAT SUPER-MASSIVE BLACK HOLES GROW BY COLD CHAOTIC ACCRETION
in The Astrophysical Journal
Description | DiRAC2: Recurrent Costs for 100 Tflop/s HPC cluster |
Amount | £391,000 (GBP) |
Funding ID | ST/K003259/1 |
Organisation | Science and Technologies Facilities Council (STFC) |
Sector | Public |
Country | United Kingdom |
Start | 05/2012 |
End | 01/2016 |
Description | DiRAC |
Organisation | Science and Technologies Facilities Council (STFC) |
Department | Distributed Research Utilising Advanced Computing |
Country | United Kingdom |
Sector | Academic/University |
PI Contribution | I am the PI for two research grants for the procurement and running of the Complexity@DiRAC High Performance Computing cluster at the University of Leicester. This cluster is now in active operation as a national HPC facility. |
Collaborator Contribution | DiRAC is the facility which provides HPC resources for the theoretical astrophysics and particle physics communities within STFC. |
Impact | The establishment and running of a new HPC cluster at the University of Leicester as part of the DiRAC national facility. |
Start Year | 2011 |
Description | Astronomy Ireland |
Form Of Engagement Activity | A talk or presentation |
Part Of Official Scheme? | No |
Type Of Presentation | Keynote/Invited Speaker |
Geographic Reach | Regional |
Primary Audience | Public/other audiences |
Results and Impact | I spoke to about 100 people at the Astronomy Ireland meeting in November 2013 in Trinity College Dublin. My talk was very well received and I have been invited to give another talk to this audience at a later date. |
Year(s) Of Engagement Activity | 2013 |
URL | http://www.astronomy.ie/lecture201311.php |
Description | BBC Stargazing Live |
Form Of Engagement Activity | A talk or presentation |
Part Of Official Scheme? | No |
Type Of Presentation | Keynote/Invited Speaker |
Geographic Reach | Regional |
Primary Audience | Public/other audiences |
Results and Impact | Presentations as part of the BBC Stargazing Live at the National Space Centre and at the University of Leicester, attended by approximately 50 people (2011), 50 people (2012), 300 people (2013), 100 people (2014). The presentation generated lots of questions and discussion from the audience. Local schools had an opportunity to visit the University which is good for inclusivity. |
Year(s) Of Engagement Activity | 2011,2012,2013,2014 |
Description | Cafe Scientifique |
Form Of Engagement Activity | A talk or presentation |
Part Of Official Scheme? | No |
Type Of Presentation | Keynote/Invited Speaker |
Geographic Reach | Regional |
Primary Audience | Public/other audiences |
Results and Impact | I spoke to the Nottingham Cafe Scientifique about various aspects of the research that myself and others are doing with DiRAC. About 40 people attended. I gave a 25 minute presentation which was followed by more than an hour of questions and discussion. One audience member wrote a blog piece about my talk. |
Year(s) Of Engagement Activity | 2014 |
URL | http://nottinghamscience.blogspot.co.uk/2014/02/talk-building-galaxies-in-office.html |
Description | Royal Society Summer Exhibition |
Form Of Engagement Activity | A talk or presentation |
Part Of Official Scheme? | Yes |
Geographic Reach | National |
Primary Audience | Schools |
Results and Impact | Over the course of the four day, more than 600 people attended my talks. The Friday evening presentation was followed by more than an hour of audience questions. Several audience members contacted me to ask additional questions. |
Year(s) Of Engagement Activity | 2014 |
Description | School Visit (Dublin) |
Form Of Engagement Activity | A talk or presentation |
Part Of Official Scheme? | No |
Type Of Presentation | Keynote/Invited Speaker |
Geographic Reach | Local |
Primary Audience | Schools |
Results and Impact | Approximately 90 primary school students (3 classes) aged 8-12 years old attended my talks in Rathfarnham Parish National School. Following my visit, a number of students expressed interest in pursuing a career in science. |
Year(s) Of Engagement Activity | 2013 |
Description | Secular Society |
Form Of Engagement Activity | A talk or presentation |
Part Of Official Scheme? | No |
Type Of Presentation | Keynote/Invited Speaker |
Geographic Reach | Regional |
Primary Audience | Public/other audiences |
Results and Impact | Spoke to about 50 members of the Leicester Secular Society. My talk generated considerable discussion among the members of the LSS. |
Year(s) Of Engagement Activity | 2012 |
URL | http://www.leicestersecularsociety.org.uk/calendar/view_entry.php?id=1145&date=20121209 |