Results 51 to 60 of about 11,545 (216)

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, José Manuel Vílchez Medina   +1 more
wiley   +1 more source

Abundance Analysis of Stars at Large Radius in the Sextans Dwarf Spheroidal Galaxy

The Astrophysical Journal, 2023
We present the stellar parameters and chemical abundances of 30 elements for five stars located at large radii (3.5–10.7 times the half-light radius) in the Sextans dwarf spheroidal galaxy. We selected these stars using proper motions, radial velocities,
Ian U. Roederer, Andrew B. Pace, Vinicius M. Placco, Nelson Caldwell, Sergey E. Koposov, Mario Mateo, Edward W. Olszewski, Matthew G. Walker   +7 more
doaj   +1 more source

Homogeneous Photometry VI: Variable Stars in the Leo I Dwarf Spheroidal Galaxy

, 2014
We have characterized the pulsation properties of 164 candidate RR Lyrae variables (RRLs) and 55 candidate Anomalous and/or short-period Cepheids in Leo I dwarf spheroidal galaxy.
Bernard, Edouard J., Bono, Giuseppe, Ferraro, Ivan, Fiorentino, Giuliana, Gallart, Carme, Iannicola, Giacinto, Monelli, Matteo, Stetson, Peter B.   +7 more
core   +1 more source

The Effect of Tidal Stripping on Composite Stellar Populations in Dwarf Spheroidal Galaxies [PDF]

, 2009
We use N-body simulations to study the effects of tides on the kinematical structure of satellite galaxies orbiting a Milky Way-like potential. Our work is motivated by observations of dwarf spheroidal galaxies in the Local Group, for which often a ...
Battaglia, Giuseppina, Helmi, Amina, Sales, Laura V.   +2 more
core   +3 more sources

No WIMP mini-spikes in dwarf spheroidal galaxies [PDF]

Journal of Cosmology and Astroparticle Physics, 2015
The formation of black holes inevitably affects the distribution of dark and baryonic matter in their vicinity, leading to an enhancement of the dark matter density, called spike, and if dark matter is made of WIMPs, to a strong enhancement of the dark matter annihilation rate.
Wanders, Mark, Bertone, Gianfranco, Volonteri, Marta, Weniger, Christoph   +3 more
openaire   +4 more sources

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, Wallace Tucker, Anselmo Meregaglia   +2 more
wiley   +1 more source

Dark Matter Halo Properties of the Galactic Dwarf Satellites: Implication for Chemo-dynamical Evolution of the Satellites and a Challenge to Lambda Cold Dark Matter

The Astrophysical Journal, 2023
Elucidating dark matter density profiles in Galactic dwarf satellites is essential to understanding not only the quintessence of dark matter, but also the evolution of the satellites themselves.
Kohei Hayashi, Yutaka Hirai, Masashi Chiba, Tomoaki Ishiyama   +3 more
doaj   +1 more source

Constraining Dwarf Spheroidal Dark Matter Halos With The Galactic Center Excess

, 2017
If the gamma-ray excess from the galactic center reported by Fermi-LAT is a signal from annihilating dark matter, one must question why a similar excess has not been observed in dwarf spheroidal galaxies.
Choquette, Jeremie
core   +1 more source

Intermediate Mass Black Holes: Their Motion and Associated Energetics

Advances in High Energy Physics, Volume 2014, Issue 1, 2014., 2014
There is a lot of current astrophysical evidence and interest in intermediate mass black holes (IMBH), ranging from a few hundred to several thousand solar masses. The active galaxy M82 and the globular cluster G1 in M31, for example, are known to host such objects.
C. Sivaram, Kenath Arun, Christian Corda
wiley   +1 more source

Search for Ultraheavy Dark Matter from Observations of Dwarf Spheroidal Galaxies with VERITAS

The Astrophysical Journal, 2023
Dark matter is a key piece of the current cosmological scenario, with weakly interacting massive particles (WIMPs) a leading dark matter candidate. WIMPs have not been detected in their conventional parameter space (100 GeV ≲ M _χ ≲ 100 TeV), a mass ...
A. Acharyya, A. Archer, P. Bangale, J. T. Bartkoske, P. Batista, M. Baumgart, W. Benbow, J. H. Buckley, A. Falcone, Q. Feng, J. P. Finley, G. M. Foote, L. Fortson, A. Furniss, G. Gallagher, W. F. Hanlon, O. Hervet, J. Hoang, J. Holder, T. B. Humensky, W. Jin, P. Kaaret, M. Kertzman, M. Kherlakian, D. Kieda, T. K. Kleiner, N. Korzoun, F. Krennrich, M. J. Lang, M. Lundy, G. Maier, C. E McGrath, P. Moriarty, S. O’Brien, R. A. Ong, K. Pfrang, M. Pohl, E. Pueschel, J. Quinn, K. Ragan, P. T. Reynolds, E. Roache, N. L. Rodd, J. L. Ryan, I. Sadeh, L. Saha, M. Santander, G. H. Sembroski, R. Shang, M. Splettstoesser, D. Tak, J. V. Tucci, V. V. Vassiliev, D. A. Williams   +53 more
doaj   +1 more source