ar X iv : a st ro - p h / 93 10 02 8 v 1 1 4 O ct 1 99 3 WHAT DO WE MEAN BY ‘ MALMQUIST BIAS ’ ?

ar X iv : a st ro - p h / 93 10 02 6 v 1 1 4 O ct 1 99 3 Alpha Clustering and the stellar nucleosynthesis of carbon

The astrophysical S–factor and reaction rates for the triple–alpha process are calculated in the direct–capture model. It is shown that the stellar carbon production is extremely sensitive to small variations in the N–N interaction.

ar X iv : a st ro - p h / 93 10 02 9 v 1 1 4 O ct 1 99 3 Optimal Galaxy Distance Estimators

The statistical properties of galaxy distance estimators corresponding to the Tully-Fisher and D n − σ relations are studied, and a rigorous framework for identifying and removing the effects of Malmquist bias due to observational selection is developed. The prescription of Schechter (1980) for defining unbiased distance estimators is verified and extended to more general – and more realistic –...

ar X iv : a st ro - p h / 98 10 02 1 v 1 1 O ct 1 99 8 A NIR search for high - redshift clusters

We describe our preliminary results on a search for high-redshift (z > 0.5) galaxy clusters using near-infrared photometry obtained with the Omega camera at the 3.5m telescope at Calar Alto.

ar X iv : a st ro - p h / 93 10 02 3 v 1 1 3 O ct 1 99 3 Mergers of Systems Containing Gas

Several simple mergers between model galaxy clusters containing a mixture of gas and dark matter are examined, testing the coupling of the gas to the underlying collisionless material. The gas is shocked, irreversibly dissipating the energy fed into it by the collisionless component and forms a resolved constant-density core. For the dark matter, however, admixture of phase space vacuum is not ...

ar X iv : a st ro - p h / 98 10 37 1 v 1 2 2 O ct 1 99 8 ELLIPTICAL GALAXY DYNAMICS