Results 21 to 30 of about 334 (140)
Abundance of Substructure in Clusters of Galaxies
The Astrophysical Journal, 2004 It is widely recognized that cold dark matter models predict abundant dark matter substructure in halos of all sizes. Galaxy-galaxy lensing provides a unique opportunity to directly measure the presence and the mass of such substructures in clusters of galaxies.
Natarajan, P., Springel, V.
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ON THE SURVIVAL AND ABUNDANCE OF DISK-DOMINATED GALAXIES [PDF]
The Astrophysical Journal, 2009 We study the formation of disk-dominated galaxies in a Lambda CDM universe. Their existence is considered to be a challenge for the Lambda CDM cosmology, because galaxy mergers isotropize stellar disks and trigger angular momentum transport in gas disks, thus fostering the formation of central stellar spheroids. Here, we postulate that the formation of
Koda, Jun +2 more
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Intermediate‐Element Abundances in Galaxy Clusters [PDF]
The Astrophysical Journal, 2005 We present the average abundances of the intermediate elements obtained by performing a stacked analysis of all the galaxy clusters in the archive of the X-ray telescope ASCA. We determine the abundances of Fe, Si, S, and Ni as a function of cluster temperature (mass) from 1--10 keV, and place strong upper limits on the abundances of Ca and Ar.
Mushotzky, R. +7 more
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Stellar Abundances in Local Group Galaxies [PDF]
Highlights of Astronomy, 2005 AbstractHere we describe some of our latest results from measuring detailed abundances in Local Group dwarf galaxies with the VLT. Combining spectroscopic abundances with Color-Magnitude diagrams allows the effective measurement of detailed chemical evolution with time in these galaxies.
Tolstoy, Eline, Venn, Kim
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On the oxygen abundance deficiency in irregular galaxies [PDF]
New Astronomy Reviews, 2000 8 pages, 7 figures, accepted for publication in Astronomy and ...
Pilyugin, L. S., Ferrini, F.
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CHEMICAL ABUNDANCES IN CLUSTERS OF GALAXIES
, 1995 25 pages of uuencoded compressed PostScript. 4 PostScript figures and 4 PostScript tables available from http://www-astro.physics.ox.ac.uk/~bkg/gibson.html Accepted for publication in Astronomy & Astrophysics.
MATTEUCCI, MARIA FRANCESCA +1 more
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The galaxy clustering crisis in abundance matching [PDF]
Monthly Notices of the Royal Astronomical Society, 2018 Abstract Galaxy clustering on small scales is significantly underpredicted by sub-halo abundance matching (SHAM) models that populate (sub-)haloes with galaxies based on peak halo mass, Mpeak. SHAM models based on the peak maximum circular velocity, Vpeak, have had much better success.
Duncan Campbell +7 more
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Chemical abundances in Seyfert galaxies – X. Sulphur abundance estimates
Monthly Notices of the Royal Astronomical Society, 2023 ABSTRACT For the first time, the sulphur abundance relative to hydrogen (S/H) in the narrow-line regions of a sample of Seyfert 2 nuclei (Sy 2s) has been derived via direct estimation of the electron temperature. Narrow emission-line intensities from the Sloan Digital Sky Survey (SDSS) Data Release 17 (DR17) [in the wavelength range 3000
Oli L Dors +14 more
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CUMULATIVE OXYGEN ABUNDANCES OF SPIRAL GALAXIES [PDF]
The Astrophysical Journal, 2012 14 pages, 7 figures, 5 ...
Dack, Stuart, McCall, Marshall L.
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Element Abundances In Nearby Galaxies [PDF]
, 2004 In these lectures I present a highly opinionated review of the observed patterns of metallicity and element abundance ratios in nearby spiral, irregular, and dwarf elliptical galaxies, with connection to a number of astrophysical issues associated with chemical evolution.
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