Results 51 to 60 of about 314,301 (152)

Compact Quiescent Galaxies at Intermediate Redshifts

, 2014
From several searches of the area common to the Sloan Digital Sky Survey and the United Kingdom Infrared Telescope Infrared Deep Sky Survey, we have selected 22 luminous galaxies between $z \sim$ 0.4 and $z \sim$ 0.9 that have colors and sizes similar to
Hsu, Li-Yen, Shih, Hsin-Yi, Stockton, Alan   +2 more
core   +1 more source

A New Dynamical Parameter for the Study of Sticky Orbits in a 3D Galactic Model

Open Astronomy, 2011
A 3D dynamical model is used to study the motion in the central parts of an elliptical galaxy, hosting a massive and dense nucleus. Our aim is to investigate the regular or chaotic character of the motion, with emphasis in the different chaotic ...
Zotos Euaggelos E.
doaj   +1 more source

The Role of Environment on the Formation of Early-Type Galaxies [PDF]

, 2010
(Abridged) We present a detailed study of the stellar populations of a volume-limited sample of early-type galaxies from SDSS, across a range of environments -- defined as the mass of the host dark matter halo.
Bernardi, Mariangela, Ferreras, Ignacio, Kaviraj, Sugata, Lahav, Ofer, Pasquali, Anna, Rogers, Ben   +5 more
core   +2 more sources

Equivalent width Measurements in Optical Spectra of Galaxies in Local Clusters: Hints On the Star Formation History in Clusters

Open Astronomy, 2011
Equivalent widths of spectral lines in the optical spectra of galaxies are commonly used to characterize their stellar populations and to get some insight on their evolution.
Fritz Jacopo, Poggianti Bianca M., Cava Antonio, Moretti Alessia   +3 more
doaj   +1 more source

The environment of AGNs and the activity degree of their surrounding galaxies

, 2012
Aims. We present results of a comprehensive spectral study on the large-scale environment of AGNs based on Sloan Spectroscopic Survey data. Methods. We analyzed the spectra of galaxies in the environment of AGN and other activity classes up to distances ...
Kollatschny, W., Reichstein, A., Zetzl, M.   +2 more
core   +1 more source

Narrow-line Seyfert 1 Galaxies and the M_BH - sigma Relation

, 2007
We have studied the location of narrow-line Seyfert 1 (NLS1) galaxies and broad-line Seyfert 1 (BLS1) galaxies on the M_BH - sigma relation of non-active galaxies.
D. Xu, Ferrarese L., S. Komossa, Silk J.
core   +1 more source

Predictive modeling of Super El Niño through integrated local and global climate signals

Scientific Reports
Recent surges in extreme weather events underscore the critical need for advanced climate prediction models. Super El Niño (SE) events, characterized by unprecedented climatic and economic impacts, have intensified global concerns.
Chae-Hyun Yoon, Jubin Park, Myung-Ki Cheoun   +2 more
doaj   +1 more source

A Comprehensive Analysis on the Nature of the Spiral Arms in NGC 3686, NGC 4321, and NGC 2403

Galaxies
In theoretical investigations, various mechanisms have been put forward to explain the emergence of spiral patterns in galaxies. One of the few ways to find out the nature of spirals in a particular galaxy is to consider the so-called corotation radius ...
Valeria Kostiuk, Alexander Marchuk, Alexander Gusev, Ilia V. Chugunov   +3 more
doaj   +1 more source

What Does Clustering Tell Us About the Buildup of the Red Sequence?

, 2009
We analyze the clustering of red and blue galaxies from four samples spanning a redshift range of 0 ...
Abbas, Andrew R. Wetzel, Bell, Berlind, Berlind, Blanton, Blanton, Brown, Coil, Conroy, Conroy, Driver, Dunkley, Hamilton, Hansen, Hopkins, Hopkins, Jannuzi, Jeremy L. Tinker, Kaiser, Kang, Kang, Kochanek, Koester, Kravtsov, Kriek, Kriek, Labbé, Lin, Maller, Maller, Marchesini, Marín, McCracken, Moster, Nagai, Negroponte, Noeske, Papovich, Quadri, Quadri, Scoccimarro, Somerville, Strateva, Tinker, Tinker, Tinker, Tinker, Tinker, Tinker, Tinker, White, White, Williams, Willmer, Yang, Zehavi, Zhao, Zheng, Zheng, Zheng, Zheng   +61 more
core   +2 more sources

High Redshift Massive Quiescent Galaxies are as Flat as Star Forming Galaxies: The Flattening of Galaxies and the Correlation with Structural Properties in CANDELS/3D-HST [PDF]

, 2019
We investigate the median flattening of galaxies at $0 ...
Franx, Marijn, Hill, Allison R., Momcheva, Iva, Muzzin, Adam, Skelton, Rosalind E., van der Wel, Arjen, van Dokkum, Pieter, Whitaker, Katherine E.   +7 more
core   +3 more sources