Results 111 to 120 of about 43,402 (211)

Gas dynamics and disk-galaxy evolution [PDF]

Symposium - International Astronomical Union, 1985
Gas dynamics plays a vital role in the formation and ongoing evolution of a disk galaxy through its ability to have dissipative collisions. In this paper the simplest possible gas physics which provides a description of a gaseous component is incorporated into N-body experiments to investigate the formation of a disk galaxy.
openaire   +1 more source

Virgo Filaments. IV. Using WISE to Measure the Modification of Star-forming Disks in the Extended Regions Around the Virgo Cluster

The Astrophysical Journal
Recent theoretical work and targeted observational studies suggest that filaments are sites of galaxy preprocessing. The aim of the WISESize project is to directly probe galaxies over the full range of environments to quantify and characterize extrinsic ...
Kim Conger, Gregory Rudnick, Rose A. Finn, Gianluca Castignani, John Moustakas, Benedetta Vulcani, Daria Zakharova, Lizhi Xie, Francoise Combes, Pascale Jablonka, Yannick Bahé, Gabriella De Lucia, Vandana Desai, Rebecca A. Koopmann, Dara Norman, Melinda Townsend, Dennis Zaritsky   +16 more
doaj   +1 more source

Galaxy Zoo: Bars in Disk Galaxies

, 2010
We present first results from Galaxy Zoo 2, the second phase of the highly successful Galaxy Zoo project (www.galaxyzoo.org).
Masters, Karen L., Nichol, Robert C., Hoyle, Ben, Lintott, Chris, Bamford, Steven P., Edmondson, Edward M., Forston, Lucy, Keel, William C., Schawinski, Kevin, Smith, Arfon M., Thomas, Daniel   +10 more
openaire   +5 more sources

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

Parametric Survey of Nonaxisymmetric Accretion Disk Instabilities: Magnetorotational Instability to Super-Alfvénic Rotational Instability

The Astrophysical Journal
Accretion disks are highly unstable to magnetic instabilities driven by shear flow, where classically, the axisymmetric, weak-field magnetorotational instability (MRI) has received much attention through local WKB approximations.
Nicolas Brughmans, Rony Keppens, Hans Goedbloed   +2 more
doaj   +1 more source

A Turbulent Framework for Star Formation in High-redshift Galaxies

The Astrophysical Journal
Observations of distant galaxies suggest that the physics of galaxy formation at high redshifts differs significantly from later times. In contrast to large, steady disk galaxies like the Milky Way, high-redshift galaxies are often characterized by ...
Guochao Sun, Claude-André Faucher-Giguère, Jonathan Stern   +2 more
doaj   +1 more source

Iron Snails: Nonequilibrium Dynamics and Spiral Abundance Patterns

The Astrophysical Journal
Galaxies are not in a dynamical steady state: they continually undergo perturbations, e.g., from infalling dwarf galaxies and dark matter substructure. After a dynamical perturbation, stars phase mix toward a new steady state; in so doing, they generally
Neige Frankel, David W. Hogg, Scott Tremaine, Adrian Price-Whelan, Jeff Shen   +4 more
doaj   +1 more source

Investigating the Lower Limit of Metallicity for the Galactic Thin Disk

The Astrophysical Journal
We explore the metal-poor regime of the Galactic disk on the distribution of stars in the [ α /M]– V _ϕ plane, to identify the most metal-poor thin disk (MPTnD) stars belonging to the low- α sequence.
Guozhen Hu, Zhengyi Shao, Erbil Gügercinoǧlu, Wenyuan Cui   +3 more
doaj   +1 more source

Dynamics of a Galaxy at z > 10 Explored by JWST Integral Field Spectroscopy: Hints of Rotating Disk Suggesting Weak Feedback

The Astrophysical Journal
We investigate the dynamics of GN-z11, a luminous galaxy at z = 10.60, carefully analyzing the public deep integral field spectroscopy (IFS) data taken with the JWST NIRSpec integral field unit.
Yi Xu, Masami Ouchi, Hidenobu Yajima, Hajime Fukushima, Yuichi Harikane, Yuki Isobe, Kimihiko Nakajima, Minami Nakane, Yoshiaki Ono, Hiroya Umeda, Hiroto Yanagisawa, Yechi Zhang   +11 more
doaj   +1 more source

Metal-poor Stars in the MW Disk: Resonant Cooling of Vertical Oscillations of Halo Stars in Barred Galaxies

The Astrophysical Journal Letters
Using numerical simulations of a barred disk galaxy embedded in nonspinning and spinning dark matter (DM) halos, we present a novel mechanism of “cooling” the vertical oscillations of DM particles, which acquire disk kinematics.
Xingchen Li, Isaac Shlosman, Daniel Pfenniger, Clayton Heller   +3 more
doaj   +1 more source