Results 11 to 20 of about 216,057 (315)

Mapping the Galactic halo with main-sequence and RR Lyrae stars [PDF]

EPJ Web of Conferences, 2012
We present an analysis of Galactic halo structure, substructure, and metallicity traced by main-sequence and RR Lyrae stars selected from the SDSS stripe 82 and CFHT Legacy Survey data sets.
Sesar B.
doaj   +2 more sources

Galactic Halo Wormhole Solutions in f(T) Gravity

Advances in High Energy Physics, 2014
The proposal of galactic halo region is based on the idea that dark halos contain some characteristics needed to support traversable wormhole solutions. We explore wormhole solutions in this region in the framework of generalized teleparallel gravity. We
M. Sharif, Shamaila Rani
doaj   +2 more sources

Solutions of the Einstein Equations for a Black Hole Surrounded by a Galactic Halo [PDF]

Astrophysical Journal, 2022
Various profiles of matter distribution in galactic halos (such as the Navarro–Frenk–White, Burkert, Hernquist, Moore, Taylor–Silk models, and others) are considered here as the source term for the Einstein equations.
R. Konoplya, A. Zhidenko
semanticscholar   +1 more source

On the Possibility of Generalized Wormhole Formation in the Galactic Halo Due to Dark Matter Using the Observational Data within the Matter Coupling Gravity Formalism

Astrophysical Journal, 2022
In this article, we find the possibility of generalized wormhole formation in the galactic halo due to dark matter using observational data within the matter coupling gravity formalism.
G. Mustafa, S. K. Maurya, Saibal Ray
semanticscholar   +1 more source

An FRB Sent Me a DM: Constraining the Electron Column of the Milky Way Halo with Fast Radio Burst Dispersion Measures from CHIME/FRB

The Astrophysical Journal, 2023
The CHIME/FRB project has detected hundreds of fast radio bursts (FRBs), providing an unparalleled population to statistically probe the foreground media that they illuminate. One such foreground medium is the ionized halo of the Milky Way (MW).
Amanda M. Cook, Mohit Bhardwaj, B. M. Gaensler, Paul Scholz, Gwendolyn M. Eadie, Alex S. Hill, Victoria M. Kaspi, Kiyoshi W. Masui, Alice P. Curtin, Fengqiu Adam Dong, Emmanuel Fonseca, Antonio Herrera-Martin, Jane Kaczmarek, Adam E. Lanman, Mattias Lazda, Calvin Leung, Bradley W. Meyers, Daniele Michilli, Ayush Pandhi, Aaron B. Pearlman, Ziggy Pleunis, Scott Ransom, Mubdi Rahman, Ketan R. Sand, Kaitlyn Shin, Kendrick Smith, Ingrid Stairs, David C. Stenning   +27 more
doaj   +1 more source

Galactic Wormhole under Lovelock Gravity

Universe, 2022
We explore wormhole geometry in spiral galaxies under the third order Lovelock gravity. Using the cubic spline interpolation technique, we find the rotational velocity of test particles in the halo region of our spiral galaxy from observed values of ...
Koushik Chakraborty, Farook Rahaman, Saibal Ray, Banashree Sen, Debabrata Deb   +4 more
doaj   +1 more source

Detection of the LMC-induced sloshing of the Galactic halo [PDF]

Monthly notices of the Royal Astronomical Society, 2020
A wealth of recent studies have shown that the LMC is likely massive, with a halo mass >1011 M⊙. One consequence of having such a nearby and massive neighbour is that the inner Milky Way is expected to be accelerated with respect to our Galaxy’s ...
D. Erkal, A. Deason, V. Belokurov, X. Xue, Sergey E. Koposov, S. Bird, Chao Liu, I. Simion, Chengqun Yang, Lan Zhang, Gang Zhao   +10 more
semanticscholar   +1 more source

Probing the Galactic Halo with RR Lyrae Stars. I. The Catalog [PDF]

Astrophysical Journal Supplement Series, 2020
We present a catalog of 5290 RR Lyrae stars (RRLs) with metallicities estimated from spectra of the LAMOST Experiment for Galactic Understanding and Exploration (LEGUE) and the Sloan Extension for Galactic Understanding and Exploration (SEGUE) surveys ...
G.-C. Liu, Y. Huang, H.-W. Zhang, M. Xiang, J.-J., Ren, B.-Q. Chen, H.-B. Yuan, C. Wang, Y. Yang, Zhi-jia Tian, F. Wang, X.-W. Liu   +12 more
semanticscholar   +1 more source

Pressure at the ISM-halo interface: A reheating frequency dependence [PDF]

Serbian Astronomical Journal, 1998
The dependence of the thermal pressure of hot galactic halos on a model parameter describing the frequency of major reheating episodes during galactic history is investigated.
Ćirković M.M.
doaj   +1 more source

Low-frequency Faraday rotation measures towards pulsars using LOFAR: probing the 3D Galactic halo magnetic field [PDF]

Monthly notices of the Royal Astronomical Society, 2019
We determined Faraday rotation measures (RMs) towards 137 pulsars in the northern sky, using Low-Frequency Array (LOFAR) observations at 110–190 MHz. This low-frequency RM catalogue, the largest to date, improves the precision of existing RM measurements
C. Sobey, A. Bilous, J. Grießmeier, J. Hessels, A. Karastergiou, E. Keane, V. Kondratiev, M. Kramer, D. Michilli, A. Noutsos, M. Pilia, E. J. Polzin, B. Stappers, C. M. Tan, J. V. Leeuwen, J. Verbiest, P. Weltevrede, G. Heald, M. I. R. Alves, E. Carretti, T. Enßlin, M. Haverkorn, M. Iacobelli, W. Reich, C. University, C. Astronomy, S. Science, Astron Netherlands Institute for Radio Astronomy Anton Pa Astronomy, L. -. U. D. Cnrs, Station de radioastronomie de Nanccay, O. Astrophysics, Department of Physics Astronomy University of the Western Cape, Department of Applied Physics, Electronics Rhodes University, Ska Organisation, A. Institute, M. F. Astronomy, Department of Physics - California Lutheran University, M. S. Institute, I. Cagliari, J. B. C. F. Astrophysics, Fakultat fur Physik Universitat Bielefeld, D. O. U. O. Nijmegen, I. D. Radioastronomia, M. F. Astrophysik, D. I. F. Astronomy, Astrophysics   +46 more
semanticscholar   +1 more source