Results 11 to 20 of about 1,843 (251)
Metal abundances in the hot ISM of early-type galaxies [PDF]
Proceedings of the International Astronomical Union, 2009 Understanding the process of metal enrichment is one of the key problems for our picture of structure formation and evolution, in which early-type galaxies are a crucial ingredient. X-ray observations provide a powerful tool for measuring the metal distributions in their hot ISM, which is shaped by their entire history of star-formation, evolution and ...
Philip J. Humphrey, David A. Buote
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Abundances of PAHs in the ISM: confronting observations with experimental results [PDF]
Astronomy & Astrophysics, 2011 We present recent UV laboratory spectra of various polycyclic aromatic hydrocarbons (PAHs) and explore the potential of these molecules as carriers of the DIBs. From a detailed comparison of gas-phase and Ne-matrix absorption spectra of anthracene, phenanthrene, pyrene, 2,3-benzofluorene, benzo[ghi]perylene, and hexabenzocoronene with new interstellar ...
Gredel, R. +5 more
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Nautilus multi-grain model: Importance of cosmic-ray-induced desorption in determining the chemical abundances in the ISM [PDF]
Astronomy & Astrophysics, 2018 Context.Species abundances in the interstellar medium (ISM) strongly depend on the chemistry occurring at the surfaces of the dust grains. To describe the complexity of the chemistry, various numerical models have been constructed. In most of these models, the grains are described by a single size of 0.1μm.Aims.We study the impact on the abundances of ...
Wasim Iqbal, Valentine Wakelam
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Molecular ion abundances in the diffuse ISM: CF+, HCO+, HOC+, and C3H+ [PDF]
Astronomy & Astrophysics, 2019 Aims.The transition between atomic and molecular hydrogen is associated with important changes in the structure of interstellar clouds, and marks the beginning of interstellar chemistry. Most molecular ions are rapidly formed (in ion–molecule reactions) and destroyed (by dissociative recombination) in the diffuse ISM.
Gerin, M. +6 more
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The Effects of Metallicity and Abundance Pattern of the ISM on Supernova Feedback [PDF]
The Astrophysical Journal, 2020 Abstract Supernova (SN) feedback plays a vital role in the evolution of galaxies. While modern cosmological simulations capture the leading structures within galaxies, they struggle to provide sufficient resolution to study small-scale stellar feedback, such as the detailed evolution of SN remnants.
Platon I. Karpov +5 more
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Deuterium Abundance in the Local ISM [PDF]
Symposium - International Astronomical Union, 2002 Excellent HST/GHRS spectra of interstellar hydrogen and deuterium Lyman-α absorption toward nearby stars allow us to identify systematic errors that have plagued earlier work and to measure accurate values of the D/H ratio in local interstellar gas. Analysis of 12 sightlines through the Local Interstellar Cloud leads to a mean value of D/H = (1.50 ± 0 ...
Jeffrey L. Linsky, Brian E. Wood
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Abundance ratios in the hot ISM of elliptical galaxies [PDF]
Astronomy & Astrophysics, 2011 To constrain the recipes put forth to solve the theoretical Fe discrepancy in the hot interstellar medium of elliptical galaxies and at the same time explain the [alpha/Fe] ratios. In order to do so we use the latest theoretical nucleosynthetic yields, we incorporate the dust, we explore differing SNIa progenitor scenarios by means of a self-consistent
Pipino, A., MATTEUCCI, MARIA FRANCESCA
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Metal Abundances in the Hot ISM of Elliptical Galaxies [PDF]
Symposium - International Astronomical Union, 1998 In elliptical galaxies, where most of the stars were formed at an early epoch, the total mass, spatial distribution, and relative abundances of metals are intimately connected to the galaxy formation process. Determinations of the hot interstellar medium metallicity from X-ray spectral analysis are more direct, less model-dependent, and more radially ...
M. Loewenstein, R. F. Mushotzky
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THE ABUNDANCE PATTERN IN THE HOT ISM OF NGC 4472: INSIGHTS AND ANOMALIES [PDF]
The Astrophysical Journal, 2010 37 pages, including 23 figures, uses aastex.cls; accepted for publication in ...
Loewenstein, Michael, Davis, David
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Dust–Gas Scaling Relations and OH Abundance in the Galactic ISM [PDF]
The Astrophysical Journal, 2018 Abstract Observations of interstellar dust are often used as a proxy for total gas column density N H. By comparing Planck thermal dust data (Release 1.2) and new dust reddening maps from Pan-STARRS 1 and 2MASS, with accurate (opacity-corrected) H i column densities and newly published OH data from the Arecibo ...
Hiep Nguyen +12 more
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