Diversity of the Lyman continuum escape fractions of high-\$z\$ galaxies and its origins. Sumida, T., Kashino, D., & Hasegawa, K. ArXiv e-prints, 1711:arXiv:1711.05070, November, 2017. ![Diversity of the Lyman continuum escape fractions of high-\$z\$ galaxies and its origins [link]](https://bibbase.org/img/filetypes/link.svg "link")
Paper abstract bibtex The Lyman continuum (LyC) escape fraction is a key quantity to determine the contribution of galaxies to cosmic reionization. It has been known that the escape fractions estimated by observations and numerical simulations show a large diversity. However, the origins of the diversity are still uncertain. In this work, to understand what quantities of galaxies are responsible for controlling the escape fraction, we numerically evaluate the escape fraction by performing ray-tracing calculation with simplified disc galaxy models. With a smooth disc model, we explore the dependence of the escape fraction on the disposition of ionizing sources, and find that the escape fraction varies up to \${\textbackslash}sim 3\$ orders of magnitude. It is also found that the halo mass dependence of disc scale height determines whether the escape fraction increases or decreases with halo mass. With a clumpy disc model, it turns out that the escape fraction increases as the clump mass fraction increases because the density in the inter-clump region decreases. In addition, we find that clumpiness regulates the escape fraction via two ways when the total clump mass dominates the total gas mass; the escape fraction is controlled by the covering factor of clumps if the clumps are dense sufficient to block LyC photons, otherwise the clumpiness works to reduce the escape fraction by increasing the total number of recombination events in a galaxy.
@article{sumida_diversity_2017,
title = {Diversity of the {Lyman} continuum escape fractions of high-\$z\$ galaxies and its origins},
volume = {1711},
url = {http://adsabs.harvard.edu/abs/2017arXiv171105070S},
abstract = {The Lyman continuum (LyC) escape fraction is a key quantity to determine
the contribution of galaxies to cosmic reionization. It has been known
that the escape fractions estimated by observations and numerical
simulations show a large diversity. However, the origins of the
diversity are still uncertain. In this work, to understand what
quantities of galaxies are responsible for controlling the escape
fraction, we numerically evaluate the escape fraction by performing
ray-tracing calculation with simplified disc galaxy models. With a
smooth disc model, we explore the dependence of the escape fraction on
the disposition of ionizing sources, and find that the escape fraction
varies up to \${\textbackslash}sim 3\$ orders of magnitude. It is also found that the
halo mass dependence of disc scale height determines whether the escape
fraction increases or decreases with halo mass. With a clumpy disc
model, it turns out that the escape fraction increases as the clump mass
fraction increases because the density in the inter-clump region
decreases. In addition, we find that clumpiness regulates the escape
fraction via two ways when the total clump mass dominates the total gas
mass; the escape fraction is controlled by the covering factor of clumps
if the clumps are dense sufficient to block LyC photons, otherwise the
clumpiness works to reduce the escape fraction by increasing the total
number of recombination events in a galaxy.},
journal = {ArXiv e-prints},
author = {Sumida, Takumi and Kashino, Daichi and Hasegawa, Kenji},
month = nov,
year = {2017},
keywords = {Astrophysics - Astrophysics of Galaxies, Astrophysics - Cosmology and Nongalactic Astrophysics},
pages = {arXiv:1711.05070},
}
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With a smooth disc model, we explore the dependence of the escape fraction on the disposition of ionizing sources, and find that the escape fraction varies up to \\${\\textbackslash}sim 3\\$ orders of magnitude. It is also found that the halo mass dependence of disc scale height determines whether the escape fraction increases or decreases with halo mass. With a clumpy disc model, it turns out that the escape fraction increases as the clump mass fraction increases because the density in the inter-clump region decreases. In addition, we find that clumpiness regulates the escape fraction via two ways when the total clump mass dominates the total gas mass; the escape fraction is controlled by the covering factor of clumps if the clumps are dense sufficient to block LyC photons, otherwise the clumpiness works to reduce the escape fraction by increasing the total number of recombination events in a galaxy.","journal":"ArXiv e-prints","author":[{"propositions":[],"lastnames":["Sumida"],"firstnames":["Takumi"],"suffixes":[]},{"propositions":[],"lastnames":["Kashino"],"firstnames":["Daichi"],"suffixes":[]},{"propositions":[],"lastnames":["Hasegawa"],"firstnames":["Kenji"],"suffixes":[]}],"month":"November","year":"2017","keywords":"Astrophysics - Astrophysics of Galaxies, Astrophysics - Cosmology and Nongalactic Astrophysics","pages":"arXiv:1711.05070","bibtex":"@article{sumida_diversity_2017,\n\ttitle = {Diversity of the {Lyman} continuum escape fractions of high-\\$z\\$ galaxies and its origins},\n\tvolume = {1711},\n\turl = {http://adsabs.harvard.edu/abs/2017arXiv171105070S},\n\tabstract = {The Lyman continuum (LyC) escape fraction is a key quantity to determine \nthe contribution of galaxies to cosmic reionization. It has been known\nthat the escape fractions estimated by observations and numerical\nsimulations show a large diversity. However, the origins of the\ndiversity are still uncertain. In this work, to understand what\nquantities of galaxies are responsible for controlling the escape\nfraction, we numerically evaluate the escape fraction by performing\nray-tracing calculation with simplified disc galaxy models. With a\nsmooth disc model, we explore the dependence of the escape fraction on\nthe disposition of ionizing sources, and find that the escape fraction\nvaries up to \\${\\textbackslash}sim 3\\$ orders of magnitude. It is also found that the\nhalo mass dependence of disc scale height determines whether the escape\nfraction increases or decreases with halo mass. With a clumpy disc\nmodel, it turns out that the escape fraction increases as the clump mass\nfraction increases because the density in the inter-clump region\ndecreases. In addition, we find that clumpiness regulates the escape\nfraction via two ways when the total clump mass dominates the total gas\nmass; the escape fraction is controlled by the covering factor of clumps\nif the clumps are dense sufficient to block LyC photons, otherwise the\nclumpiness works to reduce the escape fraction by increasing the total\nnumber of recombination events in a galaxy.},\n\tjournal = {ArXiv e-prints},\n\tauthor = {Sumida, Takumi and Kashino, Daichi and Hasegawa, Kenji},\n\tmonth = nov,\n\tyear = {2017},\n\tkeywords = {Astrophysics - Astrophysics of Galaxies, Astrophysics - Cosmology and Nongalactic Astrophysics},\n\tpages = {arXiv:1711.05070},\n}\n\n","author_short":["Sumida, T.","Kashino, D.","Hasegawa, K."],"key":"sumida_diversity_2017","id":"sumida_diversity_2017","bibbaseid":"sumida-kashino-hasegawa-diversityofthelymancontinuumescapefractionsofhighzgalaxiesanditsorigins-2017","role":"author","urls":{"Paper":"http://adsabs.harvard.edu/abs/2017arXiv171105070S"},"keyword":["Astrophysics - Astrophysics of Galaxies","Astrophysics - Cosmology and Nongalactic Astrophysics"],"metadata":{"authorlinks":{}}},"bibtype":"article","biburl":"https://bibbase.org/zotero/polyphant","dataSources":["7gvjSdWrEu7z5vjjj"],"keywords":["astrophysics - astrophysics of galaxies","astrophysics - cosmology and nongalactic astrophysics"],"search_terms":["diversity","lyman","continuum","escape","fractions","high","galaxies","origins","sumida","kashino","hasegawa"],"title":"Diversity of the Lyman continuum escape fractions of high-\\$z\\$ galaxies and its origins","year":2017}