Results 11 to 20 of about 143,457 (288)
The formation of disc galaxies [PDF]
Monthly Notices of the Royal Astronomical Society, 1998 We investigate the influence of the cooling epoch on the formation of galaxies in a cold dark matter dominated universe. Isolated haloes, with circular speeds typical of spiral galaxies, have been selected from a low resolution numerical simulation for re-simulation at higher resolution with dark matter and gas components.
M. L. Weil +5 more
openaire +6 more sources
Monthly Notices of the Royal Astronomical Society, 2022 ABSTRACT We investigate the structure of our Galaxy’s young stellar disc by fitting the distribution functions (DFs) of a new family to 5D Gaia data for a sample of $47\, 000$ OB stars. Tests of the fitting procedure show that the young disc’s DF would be strongly constrained by Gaia data if the distribution of Galactic dust were ...
Chengdong Li, James Binney
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A prediction on the age of thick discs as a function of the stellar mass of the host galaxy [PDF]
A&A 645, L13 (2021), 2021 One of the suggested thick disc formation mechanisms is that they were born quickly and in situ from a turbulent clumpy disc. Subsequently, thin discs formed slowly within them from leftovers of the turbulent phase and from material accreted through cold flows and minor mergers. In this letter, I propose an observational test to verify this hypothesis.
arxiv +1 more source
Initial conditions for disc galaxies [PDF]
Monthly Notices of the Royal Astronomical Society, 2007 10 pages, 13 figures, MNRAS accepted; typo in email address ...
McMillan, P. J., Dehnen, W.
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Thin disc, thick disc and halo in a simulated galaxy [PDF]
Monthly Notices of the Royal Astronomical Society, 2012 Within a cosmological hydrodynamical simulation, we form a disc galaxy with sub- components which can be assigned to a thin stellar disc, thick disk, and a low mass stellar halo via a chemical decomposition. The thin and thick disc populations so selected are distinct in their ages, kinematics, and metallicities. Thin disc stars are young (<6.6 Gyr),
Andrea V. Macciò +15 more
openaire +6 more sources
Monthly Notices of the Royal Astronomical Society, 1992 Bidimensional photometry is presented for 40 bright S0 galaxies with apparent flattening b 0 /a 0 ≥ 0.9 at the 25 mag arsec -2 level. They represent all of the bright S0s in the RC2 catalogue which are seen almost face-on and are sufficiently extended for detailed investigations to be possible.
Giorgio Magrelli +2 more
openaire +2 more sources
Monthly Notices of the Royal Astronomical Society, 2023 ABSTRACT Thin galactic discs and nuclear stellar discs (NSDs) are fragile structures that can be easily disturbed by merger events. By studying the age of the stellar populations in present-day discs, we can learn about the assembly history of galaxies and place constraints on their past merger events.
Pablo M Galán-de Anta +6 more
openaire +7 more sources
The gravitational microlens influence on X-ray spectral line generated by an AGN accretion disc [PDF]
Serbian Astronomical Journal, 2001 The influence of gravitational microlensing on the X-ray spectral line profiles originated from a relativistic accretion disc has been studied. Using a disc model, we show that microlensing can induce noticeable changes in the line shapes when the ...
Popović L.Č. +4 more
doaj +1 more source
Thick Discs and the Formation of Disc Galaxies [PDF]
Symposium - International Astronomical Union, 1983 The formation of disc galaxies is generally believed to involve the dissipative collapse of primordial gas clouds, moving in the potentials of dark, self-gravitating massive halos. Until now, most theories have considered only spherically symmetric collapse, with the luminous disc being formed out of a plane of cold gas which is in centrifugal ...
Rosemary F. G. Wyse, Bernard J. T. Jones
openaire +2 more sources
The formation of disc galaxies in a ΛCDM universe [PDF]
Monthly Notices of the Royal Astronomical Society, 2010 We study the formation of disc galaxies in a fully cosmological framework using adaptive mesh refinement simulations. We perform an extensive parameter study of the main subgrid processes that control how gas is converted into stars and the coupled effect of supernovae feedback.
Romain Teyssier +3 more
openaire +7 more sources