Chemical abundances of Seyfert 2 AGNs – I. Comparing oxygen abundances from distinct methods using SDSS
نویسندگان
چکیده
منابع مشابه
Cosmological Constraints from Sdss Maxbcg Cluster Abundances
We perform a maximum likelihood analysis of the cluster abundance measured in the SDSS using the maxBCG cluster finding algorithm. Our analysis is aimed at constraining the power spectrum normalization σ8, and assumes flat cosmologies with a scale invariant spectrum, massless neutrinos, and CMB and supernova priors Ωmh 2 = 0.128 ± 0.01 and h = 0.72 ± 0.05 respectively. Following the method desc...
متن کاملChemical Abundances and Yields from Massive Stars
Stellar rotation produces an internal mixing of the elements due to shear instability and meridional circulation. This leads to observable N/C enhancements in massive stars above about 7–9 M⊙. Rotation also favours mass loss by stellar winds. Mass loss effects dominate for masses above 30 M⊙, while mixing dominates below that limit. The effects of mixing are also much larger at lower metallicit...
متن کاملChemical abundances from Magellanic cloud B stars
In recent years, B stars have been established as reliable tracers of present day abundance patterns. They yield an independent set of abundances from He to Fe which can be cross-checked against other sources such as H ii regions and cool supergiants. In this paper, we present purely spectroscopic analyses of 9 non-supergiant B stars (13 < mV < 15), 5 of which located in the young populous clus...
متن کاملChemical Evolution of Cno Abundances
New low and intermediate mass star yields recalculated by Buell (1987) are evaluated by using them in a Galactic Chemical Evolution model. We analyze their effects on CNO elemental abundances
متن کاملChemical Abundances in Clusters of
We study the origin of iron and-elements (O, Mg, Si) in clusters of galaxies. In particular, we discuss the O/Fe] ratio and the iron mass-to-luminosity ratio in the intracluster medium (ICM) and their link to the chemical and dynamical evolution of elliptical and lenticular galaxies. We adopt a detailed model of galactic evolution incorporating the development of supernovae-driven galactic wind...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Monthly Notices of the Royal Astronomical Society
سال: 2019
ISSN: 0035-8711,1365-2966
DOI: 10.1093/mnras/stz3492