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Strong [O III] and [N II] emission lines in globular clusters from photoionized R Corona Borealis star winds
emission lines globular clusters
2011/1/13
The globular cluster X-ray source CXO J033831.8-352604 in NGC 1399 has recently been found to show strong emission lines of [O III] and [N II] in its optical spectrum in addition to ultraluminous X-ra...
Flying across Galaxy Clusters with Google Earth: additional imagery from SDSS co-added data
Flying across Galaxy Clusters Google Earth SDSS co-added data
2011/1/13
Galaxy clusters are spectacular. We provide a Google Earth compatible imagery for the deep co-added images from the Sloan Digital Sky Survey and make it a tool for examing galaxy clusters. More detail...
There is much debate on how high-mass star formation varies with environment, and whether the sparsest star-forming environments are capable of forming massive stars. To address this issue, we have ob...
Constraining the Redshift Evolution of FIRST Radio Sources in RCS1 Galaxy Clusters
the Redshift Evolution FIRST Radio Sources
2011/1/13
We conduct a statistical analysis of the radio source population in galaxy clusters as a function of redshift by matching radio sources from the Faint Images of the Radio Sky at Twenty-Centimeters (FI...
Massive and Refined. II. The statistical properties of turbulent motions in massive galaxy clusters with high spatial resolution
The statistical properties turbulent motions massive galaxy clusters
2011/1/13
We study the properties of chaotic motions in the intra cluster medium using a set of 20 galaxy clusters simulated with large dynamical range, using the Adaptive Mesh Refinement code ENZO (e.g. Norman...
Statistical comparison of clouds and star clusters
Statistical comparison clouds star clusters
2011/1/13
The extent to which the projected distribution of stars in a cluster is due to a large-scale radial gradient, and the extent to which it is due to fractal sub-structure, can be quantified -- statistic...
Dust-Obscured Star-Formation in Intermediate Redshift Galaxy Clusters
Dust-Obscured Star-Formation Intermediate Redshift Galaxy Clusters
2011/1/11
We present Spitzer MIPS 24-micron observations of 16 0.4clusters drawn from the ESO Distant Cluster Survey (EDisCS). This is the first large 24-micron survey of clusters at intermediate ...
Theory of Feedback in Clusters and Molecular Cloud Turbulence
Feedback in Clusters Molecular Cloud Turbulence
2011/1/11
I review recent numerical and analytical work on the feedback from both low- and high-mass cluster stars into their gasoeus environment. The main conclusions are that i) outflow driving appears capabl...
A great deal of research work has been undertaken in the alpha-clustering study since the pioneering discovery, half a century ago, of 12C+12C molecular resonances. Our knowledge of the field of the p...
Star Clusters in M31: Old Clusters with Bar Kinematics
catalogs – galaxies individual (M31) – galaxies star clusters – globular clusters
2010/11/12
We analyze our accurate kinematical data for the old clusters in the inner regions of M31. These velocities are based on high S/N Hectospec data (Caldwell et al 2010). The data are well suited for ana...
The mass-L_x relation for moderate luminosity X-ray clusters
mass-L_x relation moderate luminosity X-ray clusters
2010/11/10
We present measurements of the masses of a sample of 25 moderate X-ray luminosity clusters of galaxies from the 160 square degree ROSAT survey. The masses were obtained from a weak lensing analysis of...
Do giant spiral galaxies thwart clusters of young stars?（图）
giant spiral galaxies clusters young stars
2010/11/30
Astronomers in Scotland and Germany say simple physics may explain a long-standing paradox: why large clusters of young stars tend to reside in relatively small galaxies and not in giants like the Mil...
Exploring universality in nuclear clusters with Halo EFT
Exploring universality nuclear clusters Halo EFT
2010/12/29
I present results and highlight aspects of halo EFT to loosely bound systems composed of nucleons and alpha particles, with emphasis on Coulomb interactions.
The Cluster Birthline and the formation of stellar clusters in M33
Cluster Birthline stellar clusters
2010/11/10
We present a new method to analyze the IMF at its high mass end in young stellar clusters, which rely on two integrated observables: the cluster bolometric and H luminosity.Using several cluster samp...
Impact of anisotropy on vortex clusters and their dynamics
Impact of anisotropy vortex clusters their dynamics
2010/11/25
We investigate the e ects of anisotropy on the stability and dynamics of vortex cluster states
which arise in Bose-Einstein condensates. Suciently strong anisotropies are shown to stabilize states w...