Results 361 to 369 of about 279,672 (369)

The Structure of the Galactic Halo

1987
An analysis of the space distribution of metal-poor RR Lyrae stars from recent surveys suggests that the Galactic halo can be described in terms of a flattened (c/a ~ 0.6; vertical scale height ~ 1.6 kpc) inner component, which is dominant at the sun’s position, and a spherical outer component.
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Observations of the galactic halo

1989
After reviewing the history of the early research on gas in the Milky way halo, observational methods to investigate the halo are described. The meaning of the concepts Halo and HVC is discussed and selectional bias in databases is pointed out. The essentials of the interpretation of observed velocities are given. The scanty information on distances of
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Dynamical Galactic Halos

1993
It is argued that the description of the magnetic field in halos of galaxies should take into account its dynamical coupling to the other major components of the interstellar medium, namely thermal plasma and cosmic rays (CR’s). It is then inevitable to have some loss of gas and CR’s (galactic wind) provided that there exist some 201C;open” magnetic ...
V. N. Zirakashvili, V. S. Ptuskin, Heinrich J. Völk, Dieter Breitschwerdt   +3 more
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Clusters and the Galactic Halo

2015
The Galactic Halo has long ceased to be a site of active star formation, but, as the first members of the Milky Way, halo stars have played a crucial role in probing the initial stages of galaxy formation. In particular, this year sees the fiftieth anniversary of one of the seminal works in that field, an analysis of the motions of a relatively small ...
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Accretion in the Galactic Halo

Publications of the Astronomical Society of the Pacific, 2001
Fig. 1.—The available a-element ratios for each star were combined into the weighted mean and plotted against stellar metallicity. Open squares represent stars with kpc, while solid squares represent stars with apoR ≥ 16 apo galactica smaller than 16 kpc.
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On the nature of the galactic halo

Symposium - International Astronomical Union, 1967
The physical arguments for the existence of a galactic halo, as reviewed by Ginzburg in Paper 61 and by Ginzburg and Syrovatskij in Paper 71, have changed little in recent years. The observational evidence, according to the reports at this Symposium (Baldwin, Paper 56, Section 4; Burke, Paper 59; Mills, Paper 60; Discussion, Paper 63), has become more ...
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Ionization of the Galactic Halo

2005
The ionization of the Galactic halo is revealed by its Hα and X-ray emission and by UV absorption lines of highly ionized species (e.g. C IV, O VI). A fundamental problem for the understanding of the halo is the nature of the energy sources that ionize the warm gas and create the hot gas. Most of the energy sources in the Galaxy, e.g.
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Wormhole solutions for f(G)$f(G)$ gravity in galactic halo region

, 2016
M. Sharif, H. Ismat Fatima
semanticscholar   +1 more source

‘‘Invisible’’ galactic halos

The Physics Teacher, 1993
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