Results 61 to 70 of about 211,954 (220)

On the evolution of disk galaxies [PDF]

Publications of the Astronomical Society of the Pacific, 1991
galaxies is presented. A numerical code that simulates the gravitatIonal contraction of a galaxy since the protogalactic phase has been developed. The models are based on a balance between the turbulent energy dissipation of the gas and the energy input from supernovae, the star formation being regulated by the gas conditions through Schmidt's law. The
C. Firmani, A. Miranda, A. Tutukov
openaire   +1 more source

The Formation of Dwarf Galaxy Disks

The Astrophysical Journal
Dwarf galaxies are dark matter-dominated systems that are sensitive to feedback and display a diversity of baryonic morphologies. This makes them excellent probes for understanding dark matter and galaxy evolution.
Robel Geda, Akaxia Cruz, Anna C. Wright, Jenny E. Greene, Alyson Brooks, Thomas Quinn, James Wadsley, Ben Keller   +7 more
doaj   +1 more source

Disk Galaxies Are Self-similar: The Universality of the H i-to-Halo Mass Ratio for Isolated Disks

The Astrophysical Journal Letters, 2023
Observed scaling relations in galaxies between baryons and dark matter global properties are key to shed light on the process of galaxy formation and on the nature of dark matter.
Marie Korsaga, Benoit Famaey, Jonathan Freundlich, Lorenzo Posti, Rodrigo Ibata, Christian Boily, Katarina Kraljic, D. Esparza-Arredondo, C. Ramos Almeida, Jean Koulidiati   +9 more
doaj   +1 more source

The Great Cosmic Silence: What Does the Fermi Paradox Tell About the Future of Humanity?

Global Policy, Volume 17, Issue 4, Page 553-565, September 2026.
ABSTRACT This article examines how institutional time horizons shape the long‐term survival prospects of human technological civilisation. While research on global catastrophic and existential risks has expanded, the temporal structures of political‐economic institutions remain underexamined.
Heikki Patomäki
wiley   +1 more source

Galaxy And Mass Assembly (GAMA) : the galaxy luminosity function within the cosmic web [PDF]

, 2015
EE acknowledges support from the Science and Technology Facilities Council. TMR acknowledges support from a ERC Starting Grant (DEGAS-259586). CH acknowledges support from the ERC under the EC FP7 grant number 240185.
Loveday, J, Baldry, I., E Eardley (16219808), T McNaught-Roberts (16161611), Driver, S. P., M E Cluver (16161572), M Alpaslan (16114469), I Baldry (16191140), Robotham, ASG, Robotham, A., Liske, J, Jonathan Loveday (4460899), Norberg, P, Driver, S.P., Eardley, E, Brough, S ; https://orcid.org/, Alpaslan, M., J Bland-Hawthorn (16111139), D J Farrow (16219811), Farrow, DJ, A S G Robotham (16143614), McNaught-Roberts, T., Brough, S., Loveday, J., Driver, SP, Liske, J., Farrow, D., Heymans, C, P Norberg (16143575), Peacock, JA, Alpaslan, M, J A Peacock (16045217), Robotham, A. S. G., Heymans, C., Bland-Hawthorn, J., Farrow, D. J., Bland-Hawthorn, J, Robotham, A.S.G., Baldry, I, Farrow, D.J., Peacock, J. A., Cluver, M., Driver, S., S Brough (16143590), McNaught-Roberts, T, Peacock, J.A., Norberg, P., J Liske (7814738), Eardley, E., Cluver, ME, Peacock, J., Cluver, M.E., C Heymans (16161599), Cluver, M. E., S P Driver (16143581)   +54 more
core   +1 more source

The Intrinsic Flattening of Galaxy Disks

The Astrophysical Journal
Highly inclined (edge-on) disk galaxies offer the unique perspective to constrain their intrinsic flattening, c / a , where c and a are, respectively, the vertical and long radial axes of the disk measured at suitable stellar densities.
Jeremy Favaro, Stéphane Courteau, Sébastien Comerón, Connor Stone   +3 more
doaj   +1 more source

The Stability of Some Galaxy Disks is Still Perplexing

The Astrophysical Journal, 2023
The problem of how some disk galaxies avoid forming bars remains unsolved. Many galaxy models having reasonable properties continue to manifest vigorous instabilities that rapidly form strong bars and no widely accepted idea has yet been advanced to ...
J. A. Sellwood, R. G. Carlberg
doaj   +1 more source

Visual Icons

Philosophy and Phenomenological Research, Volume 113, Issue 2, Page 327-345, September 2026.
ABSTRACT Philosophers often characterize perception as image‐like. There is little agreement, however, about what constitutes an imagistic or iconic representation. This article identifies five signature properties of iconic representations endorsed in the philosophical and scientific literature: item‐richness, feature‐richness, spatiotemporal ...
Jake Quilty‐Dunn
wiley   +1 more source

Formation and Evolution of Disk Galaxies [PDF]

Proceedings of the International Astronomical Union, 2003
AbstractGlobal star formation is the key to understanding galaxy disk formation. This in turn depends on gravitational instability of disks and continuing gas accretion as well as minor merging. A key component is feedback from supernovae. Primary observational constraints on disk galaxy formation and evolution include the Schmidt-Kennicutt law, the ...
openaire   +4 more sources

Projection effects in barred galaxies cause the wrong interpretation of radial flows

Astronomy & Astrophysics
Galaxy disks in rotation are sometimes the site of radial flows, especially in their gas component. It is important to estimate the outflows, due to active galactic nucleus or supernovae feedback, or the inflows, due to bar gravity torques.
Salibur E., Hallé A., Combes F.
doaj   +1 more source