Results 31 to 40 of about 136 (129)
Clusters of Galaxies in a Weyl Geometric Approach to Gravity
Journal of Gravity, Volume 2016, Issue 1, 2016., 2016 A model for the dark halos of galaxy clusters, based on the Weyl geometric scalar tensor theory of gravity (WST) with a MOND‐like approximation, is proposed. It is uniquely determined by the baryonic mass distribution of hot gas and stars. A first heuristic check against empirical data for 19 clusters (2 of which are outliers), taken from the ...
Erhard Scholz +1 more
wiley +1 more source
Chemodynamical Simulations of Dwarf Galaxy Evolution
Advances in Astronomy, Volume 2014, Issue 1, 2014., 2014 In this review I give a summary of the state of the art for what concerns the chemo‐dynamical numerical modelling of galaxies in general and of dwarf galaxies in particular. In particular, I focus my attention on (i) initial conditions, (ii) the equations to solve; (iii) the star formation process in galaxies, (iv) the initial mass function, (v) the ...
Simone Recchi +1 more
wiley +1 more source
Astronomical Signatures of Dark Matter
Advances in High Energy Physics, Volume 2014, Issue 1, 2014., 2014 Several independent astronomical observations in different wavelength bands reveal the existence of much larger quantities of matter than what we would deduce from assuming a solar mass to light ratio. They are very high velocities of individual galaxies within clusters of galaxies, higher than expected rotation rates of stars in the outer regions of ...
Paul Gorenstein +2 more
wiley +1 more source
Properties of the Photometric Components of Lenticular Galaxies
Advances in Astronomy, Volume 2012, Issue 1, 2012., 2012 After almost one century since their definition, the origin of lenticular galaxies is still a matter of debate. Several formation processes have been proposed in order to explain the wide variety of their observational properties. These properties could indicate that the class of lenticulars is a family formed by galaxies with different formations and ...
J. Alfonso L. Aguerri, Elias Brinks
wiley +1 more source
Two‐Phase Intracluster Medium in the Centaurus Cluster of Galaxies
The Astrophysical Journal, 1999 accepted for publication in ...
Ikebe, Yasushi +6 more
openaire +2 more sources
On the origin of central abundance drops in the intracluster medium of galaxy groups and clusters [PDF]
Monthly Notices of the Royal Astronomical Society, 2019 A central drop of ICM Fe abundance has been observed in several cool-core clusters. It has been proposed that this abundance drop may be due, at least partially, to the depletion of Fe into dust grains in the central, high-density regions. According to this scenario, noble gas elements such as Ar and Ne are not expected to be depleted into dust, and ...
Ang Liu, Meng Zhai, Paolo Tozzi
openaire +4 more sources
Evidence for AGN Feedback in Galaxy Clusters and Groups
Advances in Astronomy, Volume 2012, Issue 1, 2012., 2012 The current generation of flagship X‐ray missions, Chandra and XMM-Newton, has changed our understanding of the so‐called “cool‐core” galaxy clusters and groups. Instead of the initial idea that the thermal gas is cooling and flowing toward the center, the new picture envisages a complex dynamical evolution of the intracluster medium (ICM) regulated by
Myriam Gitti +3 more
wiley +1 more source
The Multiphase Nature of the Intracluster Medium of Some Clusters of Galaxies
The Astrophysical Journal, 2001 ApJ ...
Bonamente, Massimiliano +2 more
openaire +2 more sources
Galaxy Evolution in a Pilot Survey up to z = 1 and CDM Halos
Advances in Astronomy, Volume 2011, Issue 1, 2011., 2011 We study spectral evolution of galaxies in a magnitude limited sample of 550 galaxies from z = 1 down to z = 0.3 on a pencil beam of ≈10′ × 10′. We concentrate on the large apparent cosmological structures along the line of sight, and we bin our individual galaxy spectra to obtain representative high S/N spectra based upon these structures.
E. Giraud +7 more
wiley +1 more source
Advances in Astronomy, Volume 2011, Issue 1, 2011., 2011 Dark matter is one of the greatest unsolved mysteries in cosmology at the present time. About 80% of the Universe′s gravitating matter is nonluminous, and its nature and distribution are for the most part unknown. In this paper, we will outline the history, astrophysical evidence, candidates, and detection methods of dark matter, with the goal to give ...
Katherine Garrett +2 more
wiley +1 more source