Further Definition of the Mass-Metallicity Relation in Globular Cluster Systems Around Brightest Cluster Galaxies

We combine the globular cluster data for fifteen Brightest Cluster Galaxies and use this material to trace the mass-metallicity relations (MMR) in their globular cluster systems (GCSs). This work extends previous studies which correlate the properties of the MMR with those of the host galaxy. Our combined data sets show a mean trend for the metal-poor (MP) subpopulation which corresponds to a scaling of heavy-element abundance with cluster mass Z ~ M^(0.30+/-0.05). No trend is seen for the metal-rich (MR) subpopulation which has a scaling relation that is consistent with zero. We also find that the scaling exponent is independent of the GCS specific frequency and host galaxy luminosity, except perhaps for dwarf galaxies. We present new photometry in (g',i') obtained with Gemini/GMOS for the globular cluster populations around the southern giant ellipticals NGC 5193 and IC 4329. Both galaxies have rich cluster populations which show up as normal, bimodal sequences in the colour-magnitude diagram. We test the observed MMRs and argue that they are statistically real, and not an artifact caused by the method we used. We also argue against asymmetric contamination causing the observed MMR as our mean results are no different from other contamination-free studies. Finally, we compare our method to the standard bimodal fitting method (KMM or RMIX) and find our results are consistent. Interpretation of these results is consistent with recent models for globular cluster formation in which the MMR is determined by GC self-enrichment during their brief formation period.Comment: 35 pages, 20 figures. Accepted by Astronomical Journal. Complete preprint including high resolution figures available at http://www.physics.mcmaster.ca/~cockcroft/MMRpape

The Victorian Newsletter (Spring 1976)

The Victorian Newsletter is sponsored for the English X Group of the Modern Language Association by New York University and Queens College, City University of New York.Desperate Remedies: Sensation Novels of the 1860s / Elaine Showalter -- "Feeling Hot": Victorian Drama and the Censors / John R. Elliott, Jr. -- A Straight Bat and a Modest Mind / Coral Lansbury -- Hymns for Children: Cultural Imperialism in Victorian England / Susan S. Tamke -- Arnold's Two Regions of Form / Mary W. Schneider -- The Double Narrator in The Amazing Marriage / Robert M. DeGraaff -- Stammering in the Dodgson Family: An Unpublished Letter by 'Lewis Carroll' / Joseph Sigman and Richard Slobodin -- Recent Publications: A Selected List / Arthur F. Minerof -- Victorian Group New