Results 11 to 20 of about 148,135 (75)
Modeling star formation in dwarf spheroidal galaxies: a case for extended dark matter halos [PDF]
Astrophys.J. 624 (2005) 726-741, 2005 We propose a simple model for the formation of dwarf spheroidal galaxies, in which stars are assumed to have formed from isothermal gas in hydrostatic equilibrium inside extended dark matter halos. After expelling the leftover gas, the stellar system undergoes a dynamical relaxation inside the dark matter halo.
arxiv +1 more source
THE HOT DARK MATTER MODEL: FURTHER INVESTIGATION
Odessa Astronomical Publications, 2020 e outer region with the dominant hot dark matter (the parabolic orbit of the test particle). It was assumed that the hot dark matter consists of hypothetical Planck neutrinos arising in the decay of the protons at the Planck scale.
D. L. Khokhlov
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
An LBT view of the Andromeda’s satellite galaxies
EPJ Web of Conferences, 2017 Results are presented on deep (V ∼ 26.5 mag) time series observations of four dwarf spheroidal galaxies (dSphs) in the Andromeda (M31) complex, namely, And XIX, And XXI, And XXV and And XXVII, that we have observed with the Large Binocular Telescope (LBT)
Cusano Felice +3 more
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Constraining Dwarf Spheroidal Dark Matter Halos With The Galactic Center Excess [PDF]
Phys. Rev. D 97, 043017 (2018), 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. We use this observation to place constraints on the density profile of dwarf spheroidal galaxies under the assumption that the galactic center excess
arxiv +1 more source
Faint (and bright) variable stars in the satellites of the Milky Way
EPJ Web of Conferences, 2017 I describe two ongoing projects related with variable stars in the satellites of the MilkyWay. In the first project, we are searching for dwarf Cepheid stars (a.k.a δ Scuti and/or SX Phe) in some of the classical dwarf spheroidal galaxies. Our goal is to
Vivas A. Katherina
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THE MODELLING OF THE MASS-METALLICITY RELATION FOR THE LOCAL GROUP DWARF GALAXIES
Odessa Astronomical Publications, 2008 We present results of modelling of the mass-metallicity relation for the Local Group dwarf spheroidal (dSph) galaxies. In this work, we use a single-zone chemo-dynamical model. Our model is based on the scheme suggested by C. Firmani and A. Tutukov (1992)
M. V. Ryabova, Yu. A. Shchekinov
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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 +4 more
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The Astronomical Journal, 2023 We present results from wide-field imaging of the resolved stellar populations of the dwarf spheroidal galaxies Cassiopeia III (And XXXII) and Perseus I (And XXXIII), two satellites in the outer stellar halo of the Andromeda galaxy (M31).
Katherine L. Rhode +10 more
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Assessment of Dark Matter Models Using Dark Matter Correlations across Dwarf Spheroidal Galaxies
Universe, 2022 The predicted size of dark matter substructures in kilo-parsec scales is model-dependent. Therefore, if the correlations between dark matter mass densities as a function of the distances between them are measured via observations, we can scrutinize dark ...
Ahmad Borzou
doaj +1 more source