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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.

Ionization and charge transfer in proton-helium collisions. (1991)
Journal Article
Slim, H., Heck, E., Bransden, B., & Flower, D. (1991). Ionization and charge transfer in proton-helium collisions. Journal of Physics B: Atomic, Molecular and Optical Physics, 24(17), L421-L424. https://doi.org/10.1088/0953-4075/24/17/002

Cross sections have been calculated for single ionization in collisions between protons and helium atoms, in the range of projectile energies 25-100 keV. The semiclassical impact parameter method was employed, with a basis comprising 22 states on the... Read More about Ionization and charge transfer in proton-helium collisions..

A statistically complete survey for arc-like features in images of distant rich clusters of galaxies (1991)
Journal Article
Smail, I., Ellis, R., Fitchett, M., Nørgaard-Nielsen, H., Hansen, L., & Jørgensen, H. (1991). A statistically complete survey for arc-like features in images of distant rich clusters of galaxies. Monthly Notices of the Royal Astronomical Society, 252(1), 19-29. https://doi.org/10.1093/mnras/252.1.19

Using data from an earlier search for supernovae in distant clusters, we have constructed a homogeneous set of V images for 19 rich clusters with mean redshift z¯¯¯=0.32z¯=0.32. By considering the images above a fixed surface brightness limit, the da... Read More about A statistically complete survey for arc-like features in images of distant rich clusters of galaxies.