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Professor Cedric Lacey's Outputs (194)

Merger rates in hierarchical models of galaxy formation (1993)
Journal Article
Lacey, C., & Cole, S. (1993). Merger rates in hierarchical models of galaxy formation. Monthly Notices of the Royal Astronomical Society, 262(3), 627-649. https://doi.org/10.1093/mnras/262.3.627

We present an analytical description of the merging of virialized haloes which is applicable to any hierarchical model in which structure grows via gravitational instability. The formulae are an extension of the Press-Schechter model. The dependence... Read More about Merger rates in hierarchical models of galaxy formation.

Tidally triggered galaxy formation. II - Galaxy number counts (1993)
Journal Article
Lacey, C., Guiderdoni, B., Rocca-Volmerange, B., & Silk, J. (1993). Tidally triggered galaxy formation. II - Galaxy number counts. Astrophysical Journal, 402, 15-41. https://doi.org/10.1086/172109

A model is presented for the evolution of the galaxy luminosity function in which the distribution of the galaxy masses, star formation time scales, and star formation turn-on redshifts is derived from the initial power spectrum of density fluctuatio... Read More about Tidally triggered galaxy formation. II - Galaxy number counts.

The Disk Heating Problem (1991)
Presentation / Conference Contribution
Lacey, C. (1991, December). The Disk Heating Problem

Tidally triggered galaxy formation. I - Evolution of the galaxy luminosity function (1991)
Journal Article
Lacey, C., & Silk, J. (1991). Tidally triggered galaxy formation. I - Evolution of the galaxy luminosity function. Astrophysical Journal, 381, 14-32. https://doi.org/10.1086/170625

Motivated by accumulating evidence that large-scale galactic star formation is initiated and sustained by tidal interactions, a phenomenological model is developed for the galaxy luminosity function, commencing from a galaxy mass function that is pre... Read More about Tidally triggered galaxy formation. I - Evolution of the galaxy luminosity function.

Gravitational instability in a primordial collapsing gas cloud (1989)
Journal Article
Lacey, C. G. (1989). Gravitational instability in a primordial collapsing gas cloud. Astrophysical Journal, 336, 612-638. https://doi.org/10.1086/167039

This paper presents an analysis of the linear evolution of short-wavelength perturbations in a background fluid flow which is undergoing gravitational collapse on large scales. Local evolution equations for perturbations to an arbitrary flow are deri... Read More about Gravitational instability in a primordial collapsing gas cloud.

Energetic constraints on spectral distortions of the microwave background (1988)
Journal Article
Lacey, C. G., & Field, G. B. (1988). Energetic constraints on spectral distortions of the microwave background. Astrophysical Journal, 330(7), L1-L4. https://doi.org/10.1086/185191

The energetic constraints on mechanisms for producing the spectral distortion of the microwave background claimed by Matsumoto et al., (1988) are investigated in the light of the new upper bounds on the cosmological baryon density derived by Kawano e... Read More about Energetic constraints on spectral distortions of the microwave background.

The structure of shocks with thermal conduction and radiative cooling (1988)
Journal Article
Lacey, C. G. (1988). The structure of shocks with thermal conduction and radiative cooling. Astrophysical Journal, 326, 769-778. https://doi.org/10.1086/166136

A general analysis is presented of the structure of a steady state, plane-parallel shock wave in which both thermal conduction and radiative cooling are important. The fluid is assumed to have a perfect-gas equation of state, with radiative cooling a... Read More about The structure of shocks with thermal conduction and radiative cooling.

The diffusion of stars through phase space (1988)
Journal Article
Binney, J., & Lacey, C. (1988). The diffusion of stars through phase space. Monthly Notices of the Royal Astronomical Society, 230(4), 597-627. https://doi.org/10.1093/mnras/230.4.597

Deviations of the potentials of stellar systems from integrability cause stars to diffuse through three-dimensional orbit space. The Fokker–Planck equation that describes this diffusion takes a particularly simple form when actions are used as orbit-... Read More about The diffusion of stars through phase space.

Massive black holes in galactic halos? (1985)
Journal Article
Lacey, C., & Ostriker, J. (1985). Massive black holes in galactic halos?. Astrophysical Journal, 299, 633-652. https://doi.org/10.1086/163729

The authors consider the idea that galaxy halos are composed of massive black holes as a possible resolution of two problems: the composition of dark halos, and the heating of stellar disks. It is found that in order to account for the amount of disk... Read More about Massive black holes in galactic halos?.

Chemical evolution of the galactic disk with radial gas flows (1985)
Journal Article
Lacey, C., & Fall, S. (1985). Chemical evolution of the galactic disk with radial gas flows. Astrophysical Journal, 290, 154-170. https://doi.org/10.1086/162970

Models are presented for the chemical evolution of the galactic disc with radial inflows of the gas at a velocity constant with time, but that may vary with the galactocentric radius. The models include the infall of metal-free gas from outside the d... Read More about Chemical evolution of the galactic disk with radial gas flows.

The influence of massive gas clouds on stellar velocity dispersions in galactic discs (1984)
Journal Article
Lacey, C. (1984). The influence of massive gas clouds on stellar velocity dispersions in galactic discs. Monthly Notices of the Royal Astronomical Society, 208(4), 687-707. https://doi.org/10.1093/mnras/208.4.687

This paper calculates the evolution of the three components of the velocity dispersion of the stars in a galactic disc due to the influence of massive gas clouds in circular orbits in the disc. We find that there are two phases in this evolution: an... Read More about The influence of massive gas clouds on stellar velocity dispersions in galactic discs.

Kinematical and chemical evolution of the galactic disc (1983)
Journal Article
Lacey, C., & Fall, S. (1983). Kinematical and chemical evolution of the galactic disc. Monthly Notices of the Royal Astronomical Society, 204(3), 791-810. https://doi.org/10.1093/mnras/204.3.791

In the models presented here, metal-free gas accumulates in the galactic disc at a rate that decays exponentially on a time-scale tf. Stars then form with a constant initial mass function and a small velocity dispersion at a rate proportional to the... Read More about Kinematical and chemical evolution of the galactic disc.