نتایج جستجو برای: galaxies structure
تعداد نتایج: 1607913 فیلتر نتایج به سال:
Context. Environmental effects are known to have an important influence on cluster galaxies, but studies at very faint magnitudes (R> 21) are almost exclusively based on imaging. We present here a very deep spectroscopic survey of galaxies on the line of sight to the Coma cluster. Aims. After a series of papers based on deep multi–band imaging of the Coma cluster, we explore spectroscopically p...
We present a method for simulating numerically the eeect of the adiabatic growth of black holes on the structure of elliptical galaxies. Using a parallel self{consistent eld code, we add black holes to N{body realizations of model distribution functions for spherical galaxies, using a continuous mass{spectrum. The variable particle mass, combined with a simple multiple timestep integration sche...
We present a deep image of the radio galaxy MRC 1138 262 taken with the Hubble Space Telescope (HST) at a redshift of . The galaxy is known to have properties of a cD galaxy progenitor and be surrounded z p 2.2 by a 3 Mpc–sized structure, identified with a protocluster. The morphology shown on the new deep HST ACS image is reminiscent of a spider’s web. More than 10 individual clumpy features a...
We present early results from an ongoing study of the kinematic structure of star-forming galaxies at redshift z 2Y3 using integral-field spectroscopy of rest-frame optical nebular emission lines in combination with Keck laser guide star adaptive optics (LGSAO). We show kinematic maps of three target galaxies Q1623-BX453, Q0449-BX93, and DSF 2237a-C2 located at redshifts z 1⁄4 2:1820, 2.0067, a...
We study the effects of dust in hydrodynamic simulations of spiral galaxies when different radial metallicity gradients are assumed. SUNRISE, a Monte-Carlo radiative-transfer code, is used to make detailed calculations of the internal extinction of disk galaxies caused by their dust content. SUNRISE is used on eight different Smooth Particle Hydrodynamics (SPH) simulations of isolated spiral ga...
We present observational evidence for a galaxy ‘Type’ dependence to the location of a spiral galaxy’s disk parameters in the μ0–log h plane. With a sample of ∼40 Low Surface Brightness galaxies (both bulgeand disk-dominated) and ∼80 High Surface Brightness galaxies, the early-type disk galaxies (≤Sc) tend to define a bright envelope in the μ0–logh plane, while the late-type (≥Scd) spiral galaxi...
I give a review of catalogues of galaxies, clusters of galaxies and superclusters – sources of information to study the large-scale structure of the Universe. Thereafter I shall discuss the power spectrum of density perturbations, and the correlation function – principal description functions which characterize the large-scale structure. I shall pay special attention to the geometric interpreta...
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