Results 41 to 50 of about 74,154 (347)

A Catalog of Distance Determinations for the LAMOST DR8 K Giants in the Galactic Halo

The Astronomical Journal, 2023
We present a catalog of distances for 19,544 K giants drawn from Large Sky Area Multi-Object Fiber Spectroscopic Telescope (LAMOST) DR8. Most of them are located in the halo of the Milky Way up to ∼120 kpc.
Lan Zhang, Xiang-Xiang Xue, Chengqun Yang, Feilu Wang, Hans-Walter Rix, Gang Zhao, Chao Liu   +6 more
doaj   +1 more source

Parameters of Six Selected Galactic Potential Models

Open Astronomy, 2017
This paper is devoted to the refinement of the parameters of the six three-component (bulge, disk, halo) axisymmetric Galactic gravitational potential models on the basis of modern data on circular velocities of Galactic objects located at distances up ...
Bajkova Anisa, Bobylev Vadim
doaj   +1 more source

Sub-structures in the inner halo of the Milky Way

EPJ Web of Conferences, 2012
We present a spectroscopic study of a sample of 238 RR Lyrae stars, from the QUEST survey, located in the Galactic halo at distances between 4 and 20 kpc from the Sun.
Duffau S., Zinn R., Vivas A.K., Jaffé Y.   +3 more
doaj   +1 more source

Magnetic Reconnection Triggered by the Parker Instability in the Galaxy: Two-Dimensional Numerical Magnetohydrodynamic Simulations and Application to the Origin of X-Ray Gas in the Galactic Halo

, 2002
We propose the Galactic flare model for the origin of the X-ray gas in the Galactic halo. For this purpose, we examine the magnetic reconnection triggered by Parker instability (magnetic buoyancy instability), by performing the two-dimensional resistive ...
Appenzeller I., Appenzeller I., Chou W., Foglizzo T., Furth H. P., Hanasz M., Horiuchi T., Kahn F. D., Kazunari Shibata, Kerp J., Kerp J., Matsumoto R., Mouschovias T. C., Odstrcil D., Parker E. N., Pietz J., Shibata K., Shibata K., Shu F., Sofue Y., Syuniti Tanuma, Takaaki Yokoyama, Takahiro Kudoh, Tanuma S., Tanuma S., Tanuma S., Tosa M., Ugai M., Ugai M., Vallee J. P., Vrba F. J., Yokoyama T., Ziegler U., Zimmer F.   +33 more
core   +1 more source

The Parkes Galactic Meridian Survey (PGMS): observations and CMB polarization foreground analysis [PDF]

, 2010
We present observations and CMB foreground analysis of the Parkes Galactic Meridian Survey (PGMS), an investigation of the Galactic latitude behaviour of the polarized synchrotron emission at 2.3 GHz with the Parkes Radio Telescope.
Amarie, Baumann, Beck, Benoît, Bernardi, Bernardi, Beuermann, Boyle, Brown, Carretti, Carretti, Carretti, Carretti, Chiang, Crill, D. McConnell, De Bernardis, E. Carretti, Emerson, Finkbeiner, Frick, G. Bernardi, Gaensler, Gold, Grainger, Górski, Han, Hinshaw, Hockney, Jansson, Kamionkowski, Komatsu, Kraus, La, M. Haverkorn, Masi, N. M. McClure-Griffiths, Page, Peiris, Ponthieu, S. Cortiglioni, S. Poppi, Sbarra, Seljak, Sun, Tegmark, Tegmark, Testori, Thomas, Tucci, Verde, Wolleben   +51 more
core   +3 more sources

Revisiting perfect fluid dark matter: Observational constraints from our galaxy

Physics Letters B, 2016
We revisit certain features of an assumed spherically symmetric perfect fluid dark matter halo in the light of the observed data of our galaxy, the Milky Way (MW). The idea is to apply the Faber–Visser approach of combined observations of rotation curves
Alexander A. Potapov, Guzel M. Garipova, Kamal K. Nandi   +2 more
doaj   +1 more source

Milli-magnetic monopole dark matter and the survival of galactic magnetic fields

Journal of High Energy Physics, 2022
Dark sectors with Abelian gauge symmetries can interact with ordinary matter via kinetic mixing. In such scenarios, magnetic monopoles of a broken dark U(1) will appear in our sector as confined milli-magnetically charged objects under ordinary ...
Michael L. Graesser, Ian M. Shoemaker, Natalia Tapia Arellano   +2 more
doaj   +1 more source

The Galactic Halo from Microlensing [PDF]

Space Science Reviews, 2002
The status of the microlensing search for galactic dark matter in the form of massive astronomical compact halo objects (machos) is reviewed. Unresolved issues are discussed, as well as possible ways to solve these.
openaire   +4 more sources

The connection between the Galactic halo and ancient Dwarf Satellites

, 2017
We explore the hypothesis that the classical and ultra-faint dwarf spheroidal satellites of the Milky Way have been the building blocks of the Galactic halo by comparing their [O/Fe] and [Ba/Fe] versus [Fe/H] patterns with the ones observed in Galactic ...
Matteucci, F., Romano, D., Spitoni, E., Vincenzo, F.   +3 more
core   +1 more source

Observations of field and cluster RR Lyræ with Spitzer. Towards high precision distances with Population II stellar tracers

EPJ Web of Conferences, 2017
We present our project to calibrate the RR Lyræ period-luminosity-metallicity relation using a sample of Galactic calibrators in the halo and globular clusters.
Marengo Massimo, Neeley Jillian, Bono Giuseppe, Braga Vittorio, Dall’Ora Massimo, Marconi Marcella, Trueba Nicolas, Magurno Davide   +7 more
doaj   +1 more source