Results 51 to 60 of about 12,845 (268)

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

Massive black holes in dwarf spheroidal galaxy haloes? [PDF]

Monthly Notices of the Royal Astronomical Society, 2005
15 pages, 13 figures; accepted for publication in MNRAS.
Jin, Shoko, Ostriker, Jeremiah P., Wilkinson, Mark I.   +2 more
openaire   +2 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

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

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   +3 more sources

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

Luminosity-Diameter Relations for Globular Clusters and Dwarf Spheroidal Galaxies

, 2008
It is shown that globular clusters and the dwarf spheroidal companions of the Galaxy have a different distribution of flattening values, and appear to occupy adjacent regions of the M_v versus log R_h plane that can be separated by what will be referred ...
Belokurov, Kauffmann, Klypin, Mackey, Mackey, Martin, McLaughlin, Moore, Shapley, Shapley, Shapley, Shapley, Shapley, Sidney van den Bergh, Stonkuté, van den Bergh, van den Bergh   +16 more
core   +1 more source

The Dynamical and Chemical Evolution of Dwarf Spheroidal Galaxies [PDF]

, 2009
We present a large sample of fully self-consistent hydrodynamical Nbody/Tree-SPH simulations of isolated dwarf spheroidal galaxies (dSphs). It has enabled us to identify the key physical parameters and mechanisms at the origin of the observed variety in ...
A. Helmi, Alimi, B. Letarte, Babusiaux, Barkana, Barnes, Battaglia, Battaglia, Battaglia, Blais-Ouellette, Bosler, Bullock, Carraro, Coleman, de Blok, de Blok, de Blok, Dekel, Dolphin, E. Tolstoy, Efstathiou, Ferrara, Fukushige, G. Battaglia, Gallagher, Galli, Geisler, Gentile, Gentile, Gilmore, Gingold, Harbeck, Helmi, Hensler, Hernquist, Hernquist, Hurley-Keller, Ikuta, Irwin, K. A. Venn, Katz, Katz, Kawata, Kirby, Kleyna, Kobayashi, Koch, Koch, Kodama, Kroupa, Lanfranchi, Lee, Leitherer, Lucy, M. D. Shetrone, M. Irwin, Mac Low, Maio, Maraston, Maraston, Marcolini, Marcolini, Martin, Mateo, Mayer, Mighell, Monaghan, Moore, Mori, Mori, Murakami, Muñoz, Navarro, P. Jablonka, Peñarrubia, Poirier, Poirier, Read, Ricotti, Salpeter, Salvadori, Schmidt, Serna, Shetrone, Shetrone, Shetrone, Shetrone, Spano, Spekkens, Springel, Stinson, Stinson, Strigari, Sutherland, Swaters, T. Sawala, Tinsley, Tolstoy, Tolstoy, Tsujimoto, V. Hill, Valcke, Walker, Walker, Walker, Wise, Y. Revaz   +106 more
core   +5 more sources

The Mitchell Spectrograph: Studying Nearby Galaxies with the VIRUS Prototype

Advances in Astronomy, Volume 2013, Issue 1, 2013., 2013
The Mitchell Spectrograph (a.k.a. VIRUS‐P) on the 2.7 m Harlan J. Smith telescope at McDonald Observatory is currently the largest field of view (FOV) integral field unit (IFU) spectrograph in the world (1.7′ × 1.7′). It was designed as a prototype for the highly replicable VIRUS spectrograph which consists of a mosaic of IFUs spread over a 16 ...
Guillermo A. Blanc, Jorge Iglesias Páramo   +1 more
wiley   +1 more source

Exploring the Evolution of a Dwarf Spheroidal Galaxy with SPH Simulations. II. AGN Feedback

The Astrophysical Journal
We investigate active galactic nucleus (AGN) feedback from an intermediate-mass black hole at the center of a dwarf spheroidal galaxy, by performing isolated galaxy simulations using a modified version of the GADGET-3 code. We consider Leo II (PGC 34176)
Roberto Hazenfratz, Paramita Barai, Gustavo A. Lanfranchi, Anderson Caproni   +3 more
doaj   +1 more source