Results 61 to 70 of about 13,205 (261)

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 Smoothed-particle Hydrodynamics Simulations. I. Stellar Feedback

The Astrophysical Journal
A fundamental question regarding the evolution of dwarf spheroidal galaxies is the identification of the key physical mechanisms responsible for gas depletion.
Roberto Hazenfratz, Paramita Barai, Gustavo A. Lanfranchi, Anderson Caproni   +3 more
doaj   +1 more source

A systematic study of hidden sector dark matter: application to the gamma-ray and antiproton excesses

Journal of High Energy Physics, 2020
In hidden sector models, dark matter does not directly couple to the particle content of the Standard Model, strongly suppressing rates at direct detection experiments, while still allowing for large signals from annihilation.
Dan Hooper, Rebecca K. Leane, Yu-Dai Tsai, Shalma Wegsman, Samuel J. Witte   +4 more
doaj   +1 more source

Variable Stars in Dwarf Spheroidal Galaxies [PDF]

International Astronomical Union Colloquium, 1973
Interest in dwarf spheroidal galaxies is motivated by a number of reasons; an important one on the occasion of this colloquium is the abundance of variable stars. The theory of stellar evolution and stellar pulsations is now able to predict from theoretical considerations characteristic properties of variable stars in the colour-magnitude diagram (Iben,
openaire   +1 more source

STELLAR SUBSTRUCTURES AROUND THE HERCULES DWARF SPHEROIDAL GALAXY [PDF]

The Astrophysical Journal, 2015
13 pages, 13 figures, accepted for publication in ...
T. A. Roderick, H. Jerjen, A. D. Mackey, G. S. Da Costa   +3 more
openaire   +3 more sources

Properties of the Photometric Components of Lenticular Galaxies

Advances in Astronomy, Volume 2012, Issue 1, 2012., 2012
After almost one century since their definition, the origin of lenticular galaxies is still a matter of debate. Several formation processes have been proposed in order to explain the wide variety of their observational properties. These properties could indicate that the class of lenticulars is a family formed by galaxies with different formations and ...
J. Alfonso L. Aguerri, Elias Brinks
wiley   +1 more source

The DECam MAGIC Survey: A Wide-field Photometric Metallicity Study of the Sculptor Dwarf Spheroidal Galaxy

The Astrophysical Journal
The metallicity distribution function (MDF) and internal chemical variations of a galaxy are fundamental to understand its formation and assembly history.
F. O. Barbosa, A. Chiti, G. Limberg, A. B. Pace, W. Cerny, S. Rossi, J. L. Carlin, G. S. Stringfellow, V. M. Placco, K. Atzberger, J. A. Carballo-Bello, A. Chaturvedi, Y. Choi, D. Crnojević, A. Drlica-Wagner, A. P. Ji, N. Kallivayalil, C. E. Martínez-Vázquez, G. E. Medina, N. E. D. Noël, A. H. Riley, D. J. Sand, A. K. Vivas, C. R. Bom, P. S. Ferguson, B. Mutlu-Pakdil, M. Navabi, J. D. Sakowska, A. Zenteno, (MAGIC & DELVE Collaborations)   +29 more
doaj   +1 more source

Extreme Tidal Stripping May Explain the Overmassive Black Hole in Leo I: A Proof of Concept

The Astrophysical Journal Letters, 2023
A recent study found dynamical evidence of a supermassive black hole of ∼3 × 10 ^6 M _⊙ at the center of Leo I, the most distant dwarf spheroidal galaxy of the Milky Way. This black hole, comparable in mass to the Milky Way’s Sgr A*, places the system >2
Fabio Pacucci, Yueying Ni, Abraham Loeb
doaj   +1 more source

The mass of dwarf spheroidal galaxies and the missing satellite problem

, 2005
We present the results from a suite of N-body simulations of the tidal stripping of two-component dwarf galaxies comprising some stars and dark matter. We show that recent kinematic data from the local group dwarf spheroidal (dSph) galaxies suggests that
Evans, N. Wyn, Gilmore, G., Kleyna, Jan T., Read, J. I., Wilkinson, M. I.   +4 more
core   +1 more source

The usage of Stromgren photometry in studies of Local Group Dwarf Spheroidal Galaxies - Application to Draco: a new catalogue of Draco members and a study of the metallicity distribution function and radial gradients [PDF]

, 2006
In this paper we demonstrate how Stromgren uvby photometry can be efficiently used to: 1. Identify red giant branch stars that are members in a dwarf spheroidal galaxy. 2.
A. Ardeberg, Anthony-Twarog, Aparicio, Armandroff, Ashman, Baade, Bell, Bell, Bellazzini, Bergbusch, Bonanos, Bond, Cardelli, Carney, Carretta, Cioni, Clem, Crawford, Crawford, D. Faria, Dolphin, Fulbright, G. Gilmore, G. M. Wahlgren, Grebel, Grillmair, Grundahl, Gustafsson, Harbeck, Hartwick, Heiter, Hilker, Hodge, I. Lundström, Irwin, Irwin, Kleyna, Koch, Lehnert, Muñoz, Odenkirchen, Olsen, Olsen, Olsen, Olsen, Olszewski, P. Linde, S. Feltzing, Schlegel, Schuster, Schuster, Shapley, Shetrone, Shetrone, Smith, Stetson, Stetson, Stetson, Wilkinson, Zinn, Zinn, Zinn, Zinn   +62 more
core   +2 more sources