Now showing items 1-5 of 5
Structure and Formation of Elliptical and Spheroidal Galaxies
New surface photometry of all known elliptical galaxies in the Virgo cluster is combined with published data to derive composite profiles of brightness, ellipticity, position angle, isophote shape, and color over large ...
Bulge n And B/T In High-Mass Galaxies: Constraints On The Origin Of Bulges In Hierarchical Models
We use the bulge Sersic index n and bulge-to-total mass ratio (B/T) to explore the fundamental question of how bulges form. We perform two-dimensional bulge-disk-bar decomposition on H-band images of 143 bright, high-mass ...
A Revised Parallel-Sequence Morphological Classification of Galaxies: Structure and Formation of S0 and Spheroidal Galaxies
We update van den Bergh's parallel-sequence galaxy classification in which S0 galaxies form a sequence S0a-S0b-S0c that parallels the sequence Sa-Sb-Sc of spiral galaxies. The ratio B/T of bulge-to-total light defines the ...
Correlations Between Supermassive Black Holes, Velocity Dispersions, and Mass Deficits in Elliptical Galaxies with Cores
High-dynamic-range surface photometry in a companion paper makes possible accurate measurement of the stellar light deficits L(def) and mass deficits M(def) associated with the cores of elliptical galaxies. We show that ...
Bulgeless Giant Galaxies Challenge Our Picture Of Galaxy Formation By Hierarchical Clustering
To better understand the prevalence of bulgeless galaxies in the nearby field, we dissect giant Sc-Scd galaxies with Hubble Space Telescope (HST) photometry and Hobby-Eberly Telescope (HET) spectroscopy. We use the HET ...