Results 301 to 310 of about 948,048 (332)

Nebulae and abundances in galaxies

Publications of the Astronomical Society of the Pacific, 1986
Some current problems related to abundances in H II regions are briefly reviewed. For H II regions with measured electron temperatures, the discrepancy in O/H between the sun and the Orion Nebula is stressed. Studies of abundance and temperature variations within H II regions in NGC 604 are summarized.
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Molecular Abundances in Galaxies

AIP Conference Proceedings, 2006
Two topics are discussed here. The first is an observational study on molecular abundance in nearby (< 10 Mpc) gas‐rich galaxies based on our ammonia survey and on data in literature. As a result, a systematically peculiar molecular abundance was found in a famous starburst galaxy M 82 regarding the formation mechanisms of molecules.
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Lithium abundance at the formation of the Galaxy

Nature, 1982
The observed abundance of lithium in population I stars (young stars)1 seems to have been stable during the past 5 × 109 yr (ref. 2). This stability has been used previously1,3 to estimate the abundance of lithium at the time of formation of the Galaxy and at pre-galactic times1,3. But because the basis for this estimate was not completely satisfactory,
M. Spite, F. Spite
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Chemical Abundances in Galaxies

1988
This article is intended as a brief overview of chemical abundances in galaxies other than our own. Attention is concentrated on global properties of ellipticals and spirals, and the methods by which abundances are estimated. References are predominantly to work which has appeared since the review of Pagel and Edmunds (1981).
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Chemical evolution of the galaxy: Abundances of the light elements (sodium to calcium)

, 1987
D. Lambert
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Abundance Gradients in Spiral Galaxies

1997
The study of HII regions in the disks of spiral galaxies has given us important information about their physical conditions. In particular the study of their chemical abundances soon showed the existence of negative gradients with higher abundance towards the centre of a galaxy (e.g. Pagel and Edmunds 1981; McCall 1982; Diaz 1989; Dinerstein 1990).
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Interstellar Abundances in External Galaxies

1977
This field has been excellently reviewed recently by Peimbert (1975), Burbidge and Burbidge (1975) and Searle (1975). The present discussion will cover work since these and in particular the evidence for composition gradients across galaxies and the systematics with galactic type.
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A repeating fast radio burst source localized to a nearby spiral galaxy

Nature, 2020
Benito Marcote, Kenzie Nimmo, Jason Hessels   +2 more
exaly  

The Galaxy platform for accessible, reproducible and collaborative biomedical analyses: 2022 update

Nucleic Acids Research, 2022
Anup Kumar, Dave Clements, Frederik Coppens   +2 more
exaly  

Cosmological simulations of galaxy formation

Nature Reviews Physics, 2020
Mark Vogelsberger, Federico Marinacci, Paul Torrey   +2 more
exaly