Category Archives: Uncategorized

GGCs-DB: a progress report

“Galactic Globular Clusters Database: a progress report”

Authors: M. Castellani

Abstract: The present status of Galactic Globular Clusters Database is briefly reviewed. The features implemented at the time writing are described, as well as plans for future improvements.

Comments: 3 pages, proceedings of “XXI Century challenges for stellar evolution” (Cefalu’, Italy), eds. S. Cassisi and M. Salaris, to be published in MemSAIt, 79, 2. See this http URL for a PDF version with encapsulated figures

URL: http://arxiv.org/abs/0711.2932

(Update: PDF is now also available at scribd.com)

A comment by the author: this is the first publication related to the globular clusters database! Please feel free to report me any feedback or comment you may have 😉

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Dedication…

Just a line, to let you know that the “Globular Clustes Database” from now on, is dedicated to my father, Vittorio Castellani, who passed away on May 20, 2006.

He told me several times to keep on on this project, so… daddy, these pages are for you: from where you are now, please from time to time, take a look and see if I’m doing a “good job” … 😉

Marco Castellani

The Formation Histories of Metal-Rich and Metal-Poor Globular Clusters

Preprint (astro-ph/0605373)

Authors: Stephen E. Zepf
The Formation Histories of Metal-Rich and Metal-Poor Globular Clusters

To appear in the proceedings of the “Globular Clusters: Guides to Galaxies” conference

Abstract:
This review presents the results of ongoing studies of the formation histories of metal-poor and metal-rich globular clusters and their host galaxies. I first discuss the strong observational evidence that the globular cluster systems of most elliptical galaxies have bimodal metallicity distributions. I then focus on new results for metal-poor and metal-rich globular cluster systems. Metal-poor globular clusters are often associated with early structure formation, and I review new constraints on their formation epoch based on the “bias” of the number of metal-poor clusters with host galaxy mass. For metal-rich globular clusters, I discuss new results from ongoing optical to near-infrared photometric studies which both confirm an intermediate-age population in NGC 4365 and generally reveal a variety of formation histories for now quiescent ellipticals.


http://babbage.sissa.it/abs/astro-ph/0605373

[preprint] Globular clusters and galaxy formation

Duncan A. Forbes
Globular clusters and galaxy formation

We first discuss recent progress in using the Milky Way globular cluster (GC) system as a `test-bed’ for properties derived from integrated spectra and stellar population models. Standard techniques may give rise to spuriously high alpha-element ratios at low metallicities. We then discuss evidence for early epoch (z > 2) formation for most GCs in galaxies today. Recent accretions of GCs (and their host galaxy) make a small contribution but recent mergers form few if any new GCs in today’s elliptical galaxies. The early formation of metal-poor GCs and the bimodality seen in GC specific frequency requires a `truncation’ which may be due to reionization.

(Globular Clusters – Guides to Galaxies conference)

http://arxiv.org/abs/astro-ph/0605209

[Preprint] Globular Cluster System evolution in early type galaxies

Preprint

R. Capuzzo-Dolcetta
“Globular Cluster System evolution in early type galaxies”

Globular clusters (GCs) constitute a system which is evolving because of various interactions with the galactic environment. Evolution may be the explanation of many observed features of Globular Cluster Systems (GCSs); the different radial distribution of the GCS and the stellar component of early type galaxies is explained by dynamical friction and tidal effects, this latter acting both on the large scale (that of the bulge-halo stars) and on the small scale (that of the nucleus, often containing a central massive black hole). Merging of quickly orbitally decayed massive GCs leads to formation of a Super Star Cluster (SSC) which enriches the galactic nucleus and is a reservoire of mass-energy for a centrally located black hole

Talk given at the Globular Clusters Guide to Galaxies conference held in Concepcion (Chile) march 6-10 2006


http://arxiv.org/abs/astro-ph/0605162