نتایج جستجو برای: cluster of galaxy

تعداد نتایج: 21184710  

2008
Rupert A. C. Croft Gavin B. Dalton George Efstathiou

We estimate the cluster-galaxy cross-correlation function (ξcg), from the APM galaxy and galaxy cluster surveys. We obtain estimates both in real space from the inversion of projected statistics and in redshift space using the galaxy and cluster redshift samples. The amplitude of ξcg is found to be almost independent of cluster richness. At large separations, r ∼> 5 h Mpc ( h = H0/100km s , whe...

Journal: :Science 2001
M A Zwaan P G van Dokkum M A Verheijen

We have detected the neutral atomic hydrogen (HI) emission line at a cosmologically significant distance [redshift (z) = 0.18] in the rich galaxy cluster Abell 2218 with the Westerbork Synthesis Radio Telescope. The HI emission originates in a spiral galaxy 2.0 h65(-1) megaparsecs from the cluster core. No other significant detections have been made in the cluster, suggesting that the mechanism...

Journal: :Monthly Notices of the Royal Astronomical Society 1998

2000
S. Ortolani E. Bica B. Barbuy

By means of VI CCD photometry we identify a new globular cluster in the Galaxy: ESO 280−SC06. The images and Colour Magnitude Diagrams indicate that we are dealing with a sparsely populated globular cluster, showing a compact core. The cluster is located in Ara, projected at only 12.6 o from the plane, and appears to be metal poor ([Fe/H] ≈ −1.8). We derive a reddening E(B−V) = 0.07 and a dista...

2002
A. Peel

Galaxy cluster peculiar velocities can be inferred from high–sensitivity, high–resolution multiple–frequency observations in the 30 to 400 GHz range. While galaxy cluster counts and power spectra are sensitive to the growth factor, peculiar velocities are sensitive to the time–derivative of the growth factor and are hence complementary. Using linear perturbation theory, we forecast constraints ...

2003
Stephen L. W. McMillan Simon F. Portegies Zwart

A star cluster in a galactic nucleus sinks toward the galactic center due to dynamical friction. As it spirals inward, the cluster loses mass due to stellar evolution, relaxation driven evaporation, and tidal stripping, eventually dissolving in the galactic tidal field. We model the inspiral of dense young star clusters near the center of our Galaxy to study the extent of the region of paramete...

2006
TARO SATO CRYSTAL L. MARTIN

We report on the local environment, radial velocity, and star formation history of [O II]-selected emissionline objects in the z ≈ 0.4 galaxy cluster Abell 851, using optical spectra obtained with Keck I/LRIS and Keck II/DEIMOS. A large fraction (≈ 55%) of cluster [O II] emitters show strong Balmer absorption lines (& 4 Å in equivalent width at Hδ). These e(a)-type spectra have been attributed ...

2003
Yen-Ting Lin Joseph J. Mohr

We explore the near-infrared (NIR) K-band properties of galaxies within 93 galaxy clusters and groups using data from the Two Micron All Sky Survey (2MASS). We use X-ray properties of these clusters to pinpoint cluster centers and estimate cluster masses. By stacking all these systems, we study the shape of the cluster luminosity function and the galaxy distribution within the clusters. We find...

2005
L. Metcalfe D. Fadda A. Biviano

Starting with nearby galaxy clusters like Virgo and Coma, and continuing out to the furthest galaxy clusters for which ISO results have yet been published (z = 0.56), we discuss the development of knowledge of the infrared and associated physical properties of galaxy clusters from early IRAS observations, through the “ISO-era” to the present, in order to explore the status of ISO’s contribution...

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