Results 21 to 30 of about 507,375 (292)

Isolated elliptical galaxies in the local Universe [PDF]

open access: yes, 2015
We have studied a sample of 89 very isolated, elliptical galaxies at z < 0.08 and compared their properties with elliptical galaxies located in a high-density environment such as the Coma supercluster.
I. Lacerna   +4 more
semanticscholar   +1 more source

On the ellipticity of galaxy clusters [PDF]

open access: yesProceedings of the International Astronomical Union, 2004
We analysed 246 scanned ACO clusters and we do not find any dependence of galaxy cluster ellipticity on redshift.
J. Krywult, Monika Biernacka, Piotr Flin
openaire   +3 more sources

THE DRAGONFLY NEARBY GALAXIES SURVEY. II. ULTRA-DIFFUSE GALAXIES NEAR THE ELLIPTICAL GALAXY NGC 5485 [PDF]

open access: yes, 2016
We present the unexpected discovery of four ultra-diffuse galaxies (UDGs) in a group environment. We recently identified seven extremely low surface brightness galaxies in the vicinity of the spiral galaxy M101, using data from the Dragonfly Telephoto ...
A. Merritt   +6 more
semanticscholar   +1 more source

FOSSIL EVIDENCE FOR THE TWO-PHASE FORMATION OF ELLIPTICAL GALAXIES [PDF]

open access: yesAstrophysical Journal, 2013
Massive early-type galaxies (ETGs) have undergone dramatic structural evolution over the last 10 Gyr. A companion paper shows that nearby elliptical galaxies with M* ⩾ 1.3 × 1011M☉ generically contain three photometric subcomponents: a compact inner ...
Song Huang   +17 more
semanticscholar   +1 more source

A Cosmological Framework for the Co-Evolution of Quasars, Supermassive Black Holes, and Elliptical Galaxies. I. Galaxy Mergers and Quasar Activity [PDF]

open access: yes, 2007
We develop a model for the cosmological role of mergers in the evolution of starbursts, quasars, and spheroidal galaxies. By combining theoretically well-constrained halo and subhalo mass functions as a function of redshift and environment with empirical
P. Hopkins   +3 more
semanticscholar   +1 more source

Gravitational Lensing by Elliptical Galaxies [PDF]

open access: yesSymposium - International Astronomical Union, 2002
The probability that high-redshift quasars are gravitationally-lensed by intervening galaxies increases rapidly with the cosmological constant, ΩΛ0 (whilst being only weakly dependent on the density parameter, Ωm0), and the low number of lenses observed implies that ΩΛ0 ≲ 0.7 (e.g. Kochanek 1996).
Rachel L. Webster   +2 more
openaire   +7 more sources

New Resonance Scattering Model in AtomDB: Application to Line Suppression in Galaxy Clusters and Elliptical Galaxies

open access: yesThe Astrophysical Journal, 2023
In this paper, we present the simple, one-step, self-consistent, and fast resonance scattering model rsapec based on the AtomDB database. This model can be used as an alternative to the commonly used APEC model for fitting X-ray spectra with optically ...
Priyanka Chakraborty   +4 more
doaj   +1 more source

The origin of cold gas in giant elliptical galaxies and its role in fuelling radio-mode AGN feedback [PDF]

open access: yes, 2013
The nature and origin of the cold interstellar medium (ISM) in early-type galaxies are still a matter of debate, and understanding the role of this component in galaxy evolution and in fuelling the central supermassive black holes requires more ...
Norbert Werner   +15 more
semanticscholar   +1 more source

The (galaxy-wide) IMF in giant elliptical galaxies: From top to bottom [PDF]

open access: yes, 2013
Recent evidence based independently on spectral line strengths and dynamical modelling point towards a non-universal stellar Initial Mass Function (IMF), probably implying an excess of low-mass stars in elliptical galaxies with a high velocity dispersion.
C. Weidner   +3 more
semanticscholar   +1 more source

THE DYNAMICAL FINGERPRINT OF CORE SCOURING IN MASSIVE ELLIPTICAL GALAXIES [PDF]

open access: yes, 2013
The most massive elliptical galaxies have low-density centers or cores that differ dramatically from the high-density centers of less massive ellipticals and bulges of disk galaxies.
J. Thomas   +4 more
semanticscholar   +1 more source

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