Results 31 to 40 of about 233 (117)
The Outer Halos of Elliptical Galaxies [PDF]
, 2010 Recent progress is summarized on the determination of the density distributions of stars and dark matter, stellar kinematics, and stellar population properties, in the extended, low surface brightness halo regions of elliptical galaxies. With integral field absorption spectroscopy and with planetary nebulae as tracers, velocity dispersion and rotation ...
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Polytropic dark haloes of elliptical galaxies [PDF]
Monthly Notices of the Royal Astronomical Society, 2010 17 pages, 10 figures, 2 tables.
Saxton, Curtis J., Ferreras, Ignacio
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Photoionization in the halo of the Galaxy
The Astrophysical Journal, 1986 The ionizing radiation field in the halo is calculated and found to be dominated in the 13.6-45 eV range by light from O-B stars that escapes the disk, by planetary nebulae at 45-54 eV, by quasars and the Galactic soft X-ray background at 54-2000 eV, and by the extragalactic X-ray background at higher energies.
Joel N. Bregman, J. Patrick Harrington
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Spherical scalar field halo in galaxies [PDF]
Physical Review D, 2000 5 REVTeX pages, no figures. Contains important suggestions provided by the referee. Final version, to appear in Phys.
Matos, T., Guzman, F. S., Nunez, D.
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Building up the stellar halo of the Galaxy [PDF]
Monthly Notices of the Royal Astronomical Society, 1999 We study numerical simulations of satellite galaxy disruption in a potential resembling that of the Milky Way. Our goal is to assess whether a merger origin for the stellar halo would leave observable fossil structure in the phase-space distribution of nearby stars.
Helmi, A., White, S.
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Properties of galaxy haloes in clusters and voids [PDF]
Monthly Notices of the Royal Astronomical Society, 2002 We use the results of a high resolution N-body simulation to investigate the role of the environment on the formation and evolution of galaxy-sized halos. Starting from a set of constrained initial conditions, we have produced a final configuration hosting a double cluster in one octant and a large void extending over two octants of the simulation box.
Antonuccio-Delogu, V. +7 more
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The Outer Halos of Early-Type Galaxies [PDF]
Proceedings of the International Astronomical Union, 2014 AbstractThe outer halos of massive early-type galaxies (ETGs) are dark matter dominated and may have formed by accretion of smaller systems during galaxy evolution. Here a brief report is given of some recent work on the kinematics, angular momentum, and mass distributions of simulated ETG halos, and of corresponding properties of observed halos ...
Gerhard, O. +2 more
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Hierarchical Galaxy Formation and Substructure in the Galaxy’s Stellar Halo
The Astrophysical Journal, 2001 We develop an explicit model for the formation of the stellar halo from tidally disrupted, accreted dwarf satellites in the cold dark matter (CDM) framework, focusing on predictions testable with the Sloan Digital Sky Survey (SDSS) and other wide-field surveys. Subhalo accretion and orbital evolution are calculated using a semi-analytic approach within
Bullock, James S. +2 more
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The Milky Way, the Galactic Halo, and the Halos of Galaxies [PDF]
Proceedings of the International Astronomical Union, 2015 AbstractThe Milky Way, “our” Galaxy, is currently the subject of intense study with many ground-based surveys, in anticipation of upcoming results from the Gaia mission. From this work we have been learning about the full three-dimensional structure of the Galactic box/peanut bulge, the distribution of stars in the bar and disk, and the many streams ...
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Magnetic spiral arms in galaxy haloes [PDF]
Monthly Notices of the Royal Astronomical Society, 2017 We seek the conditions for a {\it steady} mean field galactic dynamo. The parameter set is reduced to those appearing in the $α^2$ and $α/ω$ dynamo, namely velocity amplitudes, and the ratio of sub-scale helicity to diffusivity. The parameters can be allowed to vary on conical spirals.
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