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Evolution of star clusters in arbitrary tidal fields
globular clusters: general – open clusters and associations: general – galaxies: star clusters – methods: analytical – methods: numerical
2011/10/20
We present a novel and flexible tensor approach to computing the effect of a time-dependent tidal field acting on a stellar system. The tidal forces are recovered from the tensor by polynomial interpo...
Average Heating Rate of Hot Atmospheres in Distant Clusters by Radio AGN: Evidence for Continuous AGN Heating
Average Heating Atmospheres Distant Clusters Evidence Continuous Heating
2011/10/9
We examine atmospheric heating by radio active galactic nuclei (AGN) in distant X-ray clusters by cross correlating clusters selected from the 400 Square Degree (400SD) X-ray Cluster survey with radio...
Mass segregation and fractal substructure in young massive clusters: (I) the McLuster code and method calibration
galaxies: star clusters: individual: R136 — galaxies: star formation —methods: data analysis — Magellanic Clouds
2011/10/8
By analysing models of the young massive cluster R136 in 30 Doradus, set-up using the herewith introduced and publicly made available code McLuster, we investigate and compare different methods for de...
A new Monte Carlo method has been developed in order to derive ages of young embedded clusters within massive star forming regions where there is strong differential reddening. After foreground and in...
Variable Stars in Large Magellanic Cloud Globular Clusters I: NGC 1466
Variable Stars Large Magellanic Cloud Globular Clusters
2011/10/18
This is the first in a series of papers studying the variable stars in Large Magellanic Cloud globular clusters. The primary goal of this series is to better understand how the RR Lyrae stars in Ooste...
Primordial Non-Gaussianity and Extreme-Value Statistics of Galaxy Clusters
Primordial Non-Gaussianity Extreme-Value Statistics Galaxy Clusters
2011/10/20
What is the size of the most massive object one expects to find in a survey of a given volume? In this paper, we present a solution to this problem using Extreme-Value Statistics. We calculate the pro...
Galaxy evolution in groups and clusters: star formation rates, red sequence fractions, and the persistent bimodality
methods: statistical-galaxies: groups: general-galaxies: clusters:general-galaxies: haloes-galaxies: evolution-galaxies: star formation
2011/10/17
Using galaxy group/cluster catalogs created from the Sloan Digital Sky Survey Data Release 7, we examine in detail the specific star formation rate (SSFR) distribution of satellite galaxies and its de...
Spectroscopy of Luminous Compact Blue Galaxies in Distant Clusters I. Spectroscopic Data
Spectroscopy of Luminous Compact Blue Galaxies in Distant Clusters I. Spectroscopic Data
2011/10/17
We used the DEIMOS spectrograph on the Keck II Telescope to obtain spectra of galaxies in the fields of five distant, rich galaxy clusters over the redshift range 0.5 < z < 0.9 in a search for luminou...
Open clusters in 2MASS photometry - I. Structural and basic astrophysical parameters
associations general – infrared galaxies – astronomical databases
2011/10/21
The main goal of our project is to obtain a complete picture of individual open clusters from homogeneous data and then search for correlations between their astrophysical parameters. The near-infrare...
A WFC3 study of globular clusters in NGC 4150 - an early-type minor merger
galaxies: star clusters - galaxies: individual: NGC 4150 - galaxies: ellipti-cal and lenticular, cD - galaxies: evolution galaxies: interactions - ultraviolet: galaxies
2011/10/19
We combine near-ultraviolet (NUV; 2250 {\AA}) and optical (U, B, V, I) imaging from the Wide Field Camera 3 (WFC3), on board the Hubble Space Telescope (HST), to study the globular cluster (GC) popula...
Early massive clusters and the bouncing coupled dark energy
dark energy – dark matter – cosmology: theory – galaxies: formation –methods:N-body simulations
2011/10/21
The abundance of the most massive objects in the Universe at different epochs is a very sensitive probe of the cosmic background evolution and of the growth history of density perturbations, and could...
Luminosities of recycled radio pulsars in globular clusters
stars: neutron — pulsars: general — methods:general — globular clusters: individual
2011/10/13
Using Monte Carlo simulations, we model the luminosity distribution of recycled pulsars in globular clusters as the brighter, observable part of an intrinsic distribution and find that the observed lu...
A Chemical Abundance Study of 10 Open Clusters Based on WIYN-Hydra Spectroscopy
Chemical Abundance Study Clusters Based WIYN-Hydra Spectroscopy
2011/10/12
We present a detailed chemical abundance study of evolved stars in 10 open clusters based on Hydra multi-object echelle spectra obtained with the WIYN 3.5m telescope. From an analysis of both equivale...
I review the characteristics of cluster populations in other galaxies, with particular emphasis on young star clusters and a comparison with the (known) open cluster population of the Milky Way. Young...
We develop a general theory for estimating the probability that a galaxy cluster of a given shape exists. The theory is based on the observed result that the distribution of galaxies is very close to ...