First ranked galaxies in groups and clusters
نویسندگان
چکیده
منابع مشابه
Gas in Groups and Clusters of Galaxies
Groups and clusters contain a large fraction of hot gas which emits X-ray radiation. This gas yields information on the dynamical state and on the total mass of these systems. X-ray spectra show that heavy elements are present in the gas. As these metals must have been produced in the cluster/group galaxies and later transported into the gas, the metallicity is a good tracer for the transport p...
متن کاملGlobular Clusters around Galaxies in Groups
We have obtained deep photometry of NGC 1199 (in the compact group HCG 22) and NGC 6868 (in the Telescopium loose group) with the Keck II and the VLT-I telescopes. Both galaxies are the optically brightest galaxy of their groups. NGC 1199 has two companion galaxies at a median projected distance of only 33 kpc and, based in its peculiar internal structure and large X-ray halo, NGC 6868 has been...
متن کاملTHE WARPS X-RAY SURVEY OF GALAXIES, GROUPS AND CLUSTERS – I. Method and first results
We have embarked on a survey of ROSAT PSPC archival data with the aim of detecting all significant surface brightness enhancements due to sources in the innermost R ≤ 15 arcmin of the PSPC field of view in the energy band 0.5− 2.0 keV. This project is part of the Wide Angle ROSAT Pointed Survey (WARPS) and is designed primarily to measure the low luminosity, high redshift, X-ray luminosity func...
متن کاملClusters and Groups of Galaxies in the Simulated Local Universe
We compare the properties of galaxy groups extracted from the Update Zwicky Catalogue (UZC) with those of groups extracted from the N -body simulations of the local Universe, in a ΛCDM and a τCDM cosmology. In the simulations the initial conditions of the dark matter density field are set to reproduce the present time distribution of the galaxies within 80h Mpc from the Milky Way. These initial...
متن کاملThe colours of satellite galaxies in groups and clusters
Current models of galaxy formation predict satellite galaxies in groups and clusters that are redder than observed. We investigate the effect on the colours of satellite galaxies produced by the ram pressure stripping of their hot gaseous atmospheres as the satellites orbit within their parent halo. We incorporate a model of the stripping process based on detailed hydrodynamic simulations withi...
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ژورنال
عنوان ژورنال: Monthly Notices of the Royal Astronomical Society
سال: 1985
ISSN: 0035-8711,1365-2966
DOI: 10.1093/mnras/213.4.857