Results 171 to 180 of about 618,301 (285)

Dynamical Constraints on the Formation of Elliptical Galaxies [PDF]

open access: yesarXiv, 1995
Recent work on the construction of spherical, Axisymmetric and triaxial dynamical models for elliptical galaxies is reviewed briefly, including their role in providing evidence for dark halos and central black holes. The different orbital structures and shapes of low-mass and giant elliptical galaxies provide essential constraints on scenarios of ...
arxiv  

Accelerated Structure Formation: The Early Emergence of Massive Galaxies and Clusters of Galaxies

open access: yesThe Astrophysical Journal
Galaxies in the early Universe appear to have grown too big too fast, assembling into massive, monolithic objects more rapidly than anticipated in the hierarchical Lambda cold dark matter (ΛCDM) structure formation paradigm.
Stacy S. McGaugh   +3 more
doaj   +1 more source

Intrinsic Shapes of Elliptical Galaxies [PDF]

open access: yes, 1992
Tests for the intrinsic shape of the luminosity distribution in elliptical galaxies are discussed, with an emphasis on the uncertainties. Recent determinations of the ellipticity frequency function imply a paucity of nearly spherical galaxies, and may be inconsistent with the oblate hypothesis.
openaire   +3 more sources

Galaxy Morphological Classification with Zernike Moments and Machine Learning Approaches

open access: yesThe Astrophysical Journal Supplement Series
Classifying galaxies is an essential step for studying their structures and dynamics. Using GalaxyZoo2 (GZ2) fractions thresholds, we collect 545 and 11,735 samples in nongalaxy and galaxy classes, respectively.
Hamed Ghaderi   +2 more
doaj   +1 more source

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