The evolution of superbubbles and the detection of Ly  in star-forming galaxies

Tenorio-Tagle, G.; Silich, S. A.; Kunth, D.; Terlevich, Elena; Terlevich, R.

doi:10.1046/j.1365-8711.1999.02809.x

Cited by 150 publications

(171 citation statements)

References 36 publications

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“…This is also the result obtained from numerical calculations that consider both the mechanical energy of massive stellar clusters as well as their ionizing luminosity. Tenorio-Tagle et al (1999) have shown how once the shell of swept up matter becomes Rayleigh-Taylor unstable and fragments, as it evolves out of a galaxy disk into the halo (the blowout phenomenon), it then allows not only for the venting of the hot (wind and supernovae) matter into the halo, but also for the leakage of a large fraction of the ionizing radiation. The latter soon establishes a giant conical H ii region in the low-density halo.…”

Section: Discussionmentioning

confidence: 99%

On the Large Escape of Ionizing Radiation from Giant Extragalactic H [CSC]ii[/CSC] Regions

Castellanos

Díaz

Tenorio-Tagle

2002

The Astrophysical Journal

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A thorough analysis of well-studied disk giant H ii regions, for which we know the ionizing stellar population, gas metallicity, and Wolf-Rayet population, leads to photoionization models that can only match all observed line intensity ratios (, and [S iii] with respect to the intensity of Hb), as well as the Hb luminosity and equivalent width if one allows for an important escape of energetic ionizing radiation. For the three regions presented here, the fractions of escaping Lyman continuum photons amount to 10%-73%, and in all cases, the larger fraction of escaping photons has energies of between 13.6 and 24.4 eV. These escaping photons clearly must have an important impact as sources of ionization of the diffuse ionized gas found surrounding many galaxies, as well as of the intergalactic medium.

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Section: Discussionmentioning

confidence: 99%

On the Large Escape of Ionizing Radiation from Giant Extragalactic H [CSC]ii[/CSC] Regions

Castellanos

Díaz

Tenorio-Tagle

2002

The Astrophysical Journal

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“…Tenorio-Tagle et al (1999) point out that superbubbles may initially expand with speeds that well exceed the local escape velocity of the galaxy but their motion into the gaseous halo causes a continuous deceleration lowering the velocity to values well below the escape speed. In such a case, ejecta condense into a cold phase, forming droplets that fall back and settle down onto the disc of the galaxy hence changing the composition of the ISM (the "Galactic fountain" model).…”

Section: Outflows and Inflowsmentioning

confidence: 97%

“…Kunth et al (1998) found that the strength of Lyα emission is in fact only weakly correlated with metallicity and suggested that the dynamical state of ISM is also a major regulating mechanism. A new model explains Lyα profiles in starburst galaxies by the hydrodynamics of superbubbles powered by massive stars (Tenorio-Tagle et al 1999). Searle and Sargent (1972) had already speculated on the reasons for a sudden increase of the star formation rate in BCGs, followed by long quiescent phases.…”

Section: Gas Content and Dynamics Of Bcgsmentioning

confidence: 99%

The most metal-poor galaxies

Kunth

Östlin

2000

Astronomy and Astrophysics Review

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381

428

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Metallicity is a key parameter that controls many aspects in the formation and evolution of stars and galaxies. In this review we focus on the metal deficient galaxies, in particular the most metal-poor ones, because they play a crucial rôle in the cosmic scenery. We first set the stage by discussing the difficult problem of defining a global metallicity and how this quantity can be measured for a given galaxy. The mechanisms that control the metallicity in a galaxy are reviewed in detail and involve many aspects of modern astrophysics: galaxy formation and evolution, massive star formation, stellar winds, chemical yields, outflows and inflows etc. Because metallicity roughly scales as the galactic mass, it is among the dwarfs that the most metalpoor galaxies are found. The core of our paper reviews the considerable progress made in our understanding of the properties and the physical processes that are at work in these objects. The question on how they are related and may evolve from one class of objects to another is discussed. While discussing metal-poor galaxies in general, we present a more detailed discussion of a few very metal-poor blue compact dwarf galaxies like IZw18. Although most of what is known relates to our local universe, we show that it pertains to our quest for primeval galaxies and is connected to the question of the origin of structure in the universe. We discuss what QSO absorption lines and known distant galaxies tell us already? We illustrate the importance of star-forming metal-poor galaxies for the determination of the primordial helium abundance, their use as distance indicator and discuss the possibility to detect nearly metal-free galaxies at high redshift from Lyα emission.

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“…If the neutral ISM is static with respect to the sources of Ly photons, then the covering factor of the neutral gas becomes important (Kunth et al 1998). Using such observational evidence, Tenorio-Tagle et al (1999) have developed a detailed model for the way in which outflow kinematics determine the emergent Ly profile in starburst galaxies.…”

Section: Ly Dependencesmentioning

confidence: 99%

Rest‐Frame Ultraviolet Spectra of \documentclass{aastex} \usepackage{amsbsy} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{bm} \usepackage{mathrsfs} \usepackage{pifont} \usepackage{stmaryrd} \usepackage{textcomp} \usepackage{portland,xspace} \usepackage{amsmath,amsxtra} \usepackage[OT2,OT1]{fontenc} \newcommand\cyr{ \renewcommand\rmdefault{wncyr} \renewcommand\sfdefault{wncyss} \renewcommand\encodingdefault{OT2} \normalfont \selectfont} \DeclareTextFontCommand{\textcyr}{\cyr} \pagestyle{empty} \De

Shapley

Steidel

Pettini

et al. 2003

ApJ

1,272

148

999

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We present the results of a systematic study of the rest-frame UV spectroscopic properties of Lyman break galaxies (LBGs). The database of almost 1000 LBG spectra proves useful for constructing high signalto-noise composite spectra. The composite spectrum of the entire sample reveals a wealth of features attributable to hot stars, H ii regions, dust, and outflowing neutral and ionized gas. By grouping the database according to galaxy parameters such as Ly equivalent width, UV spectral slope, and interstellar kinematics, we isolate some of the major trends in LBG spectra that are least compromised by selection effects. We find that LBGs with stronger Ly emission have bluer UV continua, weaker low-ionization interstellar absorption lines, smaller kinematic offsets between Ly and the interstellar absorption lines, and lower star formation rates. There is a decoupling between the dependence of low-and high-ionization outflow features on other spectral properties. Additionally, galaxies with rest-frame W Ly ! 20 Å in emission have weaker than average high-ionization lines and nebular emission lines that are significantly stronger than in the sample as a whole. Most of the above trends can be explained in terms of the properties of the large-scale outflows seen in LBGs. According to this scenario, the appearance of LBG spectra is determined by a combination of the covering fraction of outflowing neutral gas, which contains dust and the range of velocities over which this gas is absorbing. In contrast, the strengths of collisionally excited nebular emission lines should not be affected by the nature of the outflow, and variations in these lines may indicate differences in the temperatures and metallicities in H ii regions of galaxies with very strong Ly emission. Higher sensitivity and spectral resolution observations are still required for a full understanding of the covering fraction and velocity dispersion of the outflowing neutral gas in LBGs and its relationship to the escape fraction of Lyman continuum radiation in galaxies at z $ 3.

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The evolution of superbubbles and the detection of Ly in star-forming galaxies

Cited by 150 publications

References 36 publications

On the Large Escape of Ionizing Radiation from Giant Extragalactic H [CSC]ii[/CSC] Regions

On the Large Escape of Ionizing Radiation from Giant Extragalactic H [CSC]ii[/CSC] Regions

The most metal-poor galaxies

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