Search results for: Norman Murray

Items from 1 to 11 out of 11 results

article

Stellar feedback and bulge formation in clumpy discs

Philip F. Hopkins, Dusan Kereš, Norman Murray, Eliot Quataert, more

Monthly Notices of the Royal Astronomical Society > 427 > 2 > 968 - 978

We use numerical simulations of isolated galaxies to study the effects of stellar feedback on the formation and evolution of giant star‐forming gas ‘clumps’ in high‐redshift, gas‐rich galaxies. Such galactic discs are unstable to the formation of bound gas‐rich clumps whose properties initially depend only on global disc properties, not the microphysics of feedback. In simulations without stellar...

article

A Giant Metrewave Radio Telescope/Chandra view of IRAS 09104+4109: a type 2 QSO in a cooling flow

Ewan O'Sullivan, Simona Giacintucci, Arif Babul, Somak Raychaudhury, more

Monthly Notices of the Royal Astronomical Society > 424 > 4 > 2971 - 2993

IRAS 09104+4109 is a rare example of a dust enshrouded type 2 quasi‐stellar object (QSO) in the centre of a cool‐core galaxy cluster. Previous observations of this z = 0.44 system showed that, as well as powering the hyperluminous infrared emission of the cluster‐central galaxy, the QSO is associated with a double‐lobed radio source. However, the steep radio spectral index and misalignment between...

article

The structure of the interstellar medium of star‐forming galaxies

Philip F. Hopkins, Eliot Quataert, Norman Murray

Monthly Notices of the Royal Astronomical Society > 421 > 4 > 3488 - 3521

We develop and implement numerical methods for including stellar feedback in galaxy‐scale numerical simulations. Our models include simplified treatments of heating by Type I and Type II supernovae, gas recycling from young stars and asymptotic giant branch winds, heating from the shocked stellar winds, H ii photoionization heating and radiation pressure from stellar photons. The energetics and time...

article

Stellar feedback in galaxies and the origin of galaxy‐scale winds

Philip F. Hopkins, Eliot Quataert, Norman Murray

Monthly Notices of the Royal Astronomical Society > 421 > 4 > 3522 - 3537

Feedback from massive stars is believed to play a critical role in driving galactic super‐winds that enrich the intergalactic medium and shape the galaxy mass function, mass–metallicity relation and other global galaxy properties. In previous papers, we have introduced new numerical methods for implementing stellar feedback on sub‐giant molecular cloud (sub‐GMC) through galactic scales in numerical...

article

A physical model of FeLoBALs: implications for quasar feedback

Claude‐André Faucher‐Giguère, Eliot Quataert, Norman Murray

Monthly Notices of the Royal Astronomical Society > 420 > 2 > 1347 - 1354

Photoionization modelling of the low‐ionization broad absorption lines of certain quasars, known as FeLoBALs, has recently revealed the number density of the wind absorbers and their distance from the central supermassive black hole. From these, the feedback efficiency of the quasars can in principle be derived. The implied properties of the FeLoBALs are, however, surprising, with the thickness of...

article

Self‐regulated star formation in galaxies via momentum input from massive stars

Philip F. Hopkins, Eliot Quataert, Norman Murray

Monthly Notices of the Royal Astronomical Society > 417 > 2 > 950 - 973

Feedback from massive stars is believed to play a critical role in shaping the galaxy mass function, the structure of the interstellar medium (ISM) and the low efficiency of star formation, but the exact form of the feedback is uncertain. In this paper, the first in a series, we present and test a novel numerical implementation of stellar feedback resulting from momentum imparted to the ISM by radiation,...

chapter

Contextual Interaction Support in 3D Worlds

Norman Murray

2011 IEEE/ACM 15th International Symposium on Distributed Simulation and Real Time Applications > 58 - 63

2011 IEEE/ACM 15th International Symposium on Distributed Simulation and Real Time Applications (DS-RT)

With the increasing use of 3D displays and input devices we need to be sure that when 3D worlds are created that their users can easily learn how to operate within these 3D worlds. To do this we can provide the user with a contextal interaction support within the environment. Within virtual worlds where you are free to move around and especially when you are immersed, trying to refer to a manual to...

article

A maximum stellar surface density in dense stellar systems

Philip F. Hopkins, Norman Murray, Eliot Quataert, Todd A. Thompson

Monthly Notices of the Royal Astronomical Society: Letters > 401 > 1 > L19 - L23

We compile observations of the surface mass density profiles of dense stellar systems, including globular clusters in the Milky Way and nearby galaxies, massive star clusters in nearby starbursts, nuclear star clusters in dwarf spheroidals and late‐type discs, ultra‐compact dwarfs, and galaxy spheroids spanning the range from low‐mass ‘cusp’ bulges and ellipticals to massive ‘core’ ellipticals. We...

article

A constraint manager to support virtual maintainability

Luis Marcelino, Norman Murray, Terrence Fernando

Computers & Graphics > 2003 > 27 > 1 > 19-26

Virtual prototyping tools have already captivated the industry's interest as viable design tool. One of the key challenges for the research community is to extend the capabilities of Virtual Reality technology beyond its current scope of ergonomics and design reviews. The research presented in this paper is part of a larger research programme that aims to perform maintainability assessment on virtual...

article

A Virtual Environment for the Design and Simulated Construction of Prefabricated Buildings

Norman Murray, Terrence Fernando, Ghassan Aouad

Virtual Reality > 2003 > 6 > 4 > 244-256

The construction industry has acknowledged that its current working practices are in need of substantial improvements in quality and efficiency and has identified that computer modelling techniques and the use of prefabricated components can help reduce times, costs, and minimise defects and problems of on-site construction. This paper describes a virtual environment to support the design and construction...

article

A Framework for Describing Visual Interfaces to Databases

NORMAN MURRAY, CAROLE GOBLE, NORMAN W. PATON

Journal of Visual Languages and Computing > 1998 > 9 > 4 > 429-456

In the field of HCI there exist many formalisms for analysing, describing and evaluating interactive systems. However, in developing and evaluating user interfaces to databases, we found it necessary to be able to describe presentation and interaction aspects that are catered for poorly or not at all in current formalisms. This paper presents a framework for the systematic description of data model,...

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