Results 11 to 20 of about 4,431 (189)
Abundance Ratios in Dwarf Elliptical Galaxies [PDF]
Proceedings of the International Astronomical Union, 2016 AbstractThe aim of this study is to determine abundance ratios and star formation histories (SFH) of dwarf ellipticals in the nearby Virgo cluster. We perform a stellar population analysis of 39 dEs and study them using index-index and scaling relations. We find an unusual behaviour where [Na/Fe] is under-abundant w.r.t.
Sen, Seyda +3 more
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On the use of sulphur as a tracer for abundances in galaxies [PDF]
Monthly Notices of the Royal Astronomical Society, 2022 Abstract 2+We present a methodology for the use of sulphur as global metallicity tracer in galaxies, allowing performing a complete abundance analysis using only the red-to-near-infrared spectral region. We have applied it to a compilation of high-quality data split into two samples: H ii regions (DHR) in spiral and irregular galaxies ...
Ángeles I Díaz, S Zamora
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Modeling abundances in galaxies [PDF]
Proceedings of the International Astronomical Union, 2015 AbstractWe reviewed chemical evolution of galaxies using our cosmological simulations.
Chiaki Kobayashi, Philip Taylor
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Chemical Analysis of the Brightest Star of the Cetus II Ultrafaint Dwarf Galaxy Candidate
The Astrophysical Journal, 2023 We present a detailed chemical abundance analysis of the brightest star in the ultrafaint dwarf (UFD) galaxy candidate Cetus II from high-resolution Magellan/MIKE spectra.
K. B. Webber +44 more
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The abundance of dark galaxies [PDF]
Monthly Notices of the Royal Astronomical Society, 2002 We show that gas in a large fraction of low mass dark matter halos may form Toomre stable disks, if angular momentum is conserved when the gas contracts. Such halos would be stable to star formation and therefore remain dark. This may potentially explain the discrepancy between the predicted and observed number of dwarf satellites in the Local Group ...
Verde, Licia, Oh, S. Peng, Jimenez, Raul
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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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The Astrophysical Journal, 2023 We use the DR9 of the DESI legacy imaging survey and SDSS galaxy groups to measure the conditional luminosity function (CLF) for groups with halo mass M _h ≥ 10 ^12 M _⊙ and redshift 0.01 ≤ z ≤ 0.08, down to a limiting r -band magnitude of M _r = −10 to −
Jiacheng Meng +5 more
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Search for Extremely Metal-poor Stars with Gemini-N/Graces. I. Chemical-abundance Analysis
The Astrophysical Journal, 2023 We present stellar parameters and abundances of 13 elements for 18 very metal-poor (VMP; [Fe/H] < –2.0) stars, selected as extremely metal-poor (EMP; [Fe/H] < –3.0) candidates from the Sloan Digital Sky Survey and Large sky Area Multi-Object Fiber ...
Miji Jeong +7 more
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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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