John Pharo, Lutz Wisotzki, Tanya Urrutia, Roland Bacon, Ismael Pessa, Ramona Augustin, Ilias Goovaerts, Daria Kozlova, Haruka Kusakabe, Héctor Salas, Daniil Smirnov, Tran Thi Thai, Eloïse Vitte
{"title":"The Intrinsic Distribution of Lyman-$α$ Halos","authors":"John Pharo, Lutz Wisotzki, Tanya Urrutia, Roland Bacon, Ismael Pessa, Ramona Augustin, Ilias Goovaerts, Daria Kozlova, Haruka Kusakabe, Héctor Salas, Daniil Smirnov, Tran Thi Thai, Eloïse Vitte","doi":"arxiv-2409.04537","DOIUrl":null,"url":null,"abstract":"The emission and escape of Lyman-$\\alpha$ photons from star-forming galaxies\nis determined through complex interactions between the emitted photons and a\ngalaxy's interstellar and circumgalactic gas, causing Lyman-$\\alpha$ emitters\n(LAEs) to commonly appear not as point sources but in spatially extended halos\nwith complex spectral profiles. We develop a 3D spatial-spectral model of\nLyman-$\\alpha$ halos (LAHs) to replicate LAH observations in integral field\nspectroscopic studies, such as those made with VLT/MUSE. The profile of this\nmodel is a function of 6 key halo properties: the halo- and compact-source\nexponential scale lengths ($r_{sH}$ and $r_{sC}$), the halo flux fraction\n($f_H$), the compact component ellipticity ($q$), the spectral line width\n($\\sigma$), and the spectral line skewness parameter ($\\gamma$). Placing a\nseries of model LAHs into datacubes reflecting observing conditions in the MUSE\nUDF-Mosaic survey, we test their detection recoverability and determine that\n$\\sigma$, $r_{sH}$, and $f_H$ are expected to have the most significant effect\non the detectability of the overall LAH at a given central wavelength and\nintrinsic line luminosity. We develop a general selection function model\nspanning a grid of these halo parameters, and with a sample of 145 UDF-Mosaic\nLAHs with measured halo properties, we derive completeness-corrected, intrinsic\ndistributions of the values of $\\sigma$, $r_{sH}$, and $f_H$ for $3<z<5$ LAHs.\nWe present best-fit functional forms of the distributions, and a $\\sigma$\ndistribution corrected for instrumental line-spread function (LSF) broadening,\nand thereby show the physical line spread distribution of the intrinsic\npopulation. Finally, we discuss implications of these distributions for\nLy$\\alpha$ emission through the circumgalactic medium, finding that\nobservations undercount LAHs with extended halo scale lengths compared to the\nintrinsic population.","PeriodicalId":501187,"journal":{"name":"arXiv - PHYS - Astrophysics of Galaxies","volume":"40 1","pages":""},"PeriodicalIF":0.0000,"publicationDate":"2024-09-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"arXiv - PHYS - Astrophysics of Galaxies","FirstCategoryId":"1085","ListUrlMain":"https://doi.org/arxiv-2409.04537","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"","JCRName":"","Score":null,"Total":0}
引用次数: 0
Abstract
The emission and escape of Lyman-$\alpha$ photons from star-forming galaxies
is determined through complex interactions between the emitted photons and a
galaxy's interstellar and circumgalactic gas, causing Lyman-$\alpha$ emitters
(LAEs) to commonly appear not as point sources but in spatially extended halos
with complex spectral profiles. We develop a 3D spatial-spectral model of
Lyman-$\alpha$ halos (LAHs) to replicate LAH observations in integral field
spectroscopic studies, such as those made with VLT/MUSE. The profile of this
model is a function of 6 key halo properties: the halo- and compact-source
exponential scale lengths ($r_{sH}$ and $r_{sC}$), the halo flux fraction
($f_H$), the compact component ellipticity ($q$), the spectral line width
($\sigma$), and the spectral line skewness parameter ($\gamma$). Placing a
series of model LAHs into datacubes reflecting observing conditions in the MUSE
UDF-Mosaic survey, we test their detection recoverability and determine that
$\sigma$, $r_{sH}$, and $f_H$ are expected to have the most significant effect
on the detectability of the overall LAH at a given central wavelength and
intrinsic line luminosity. We develop a general selection function model
spanning a grid of these halo parameters, and with a sample of 145 UDF-Mosaic
LAHs with measured halo properties, we derive completeness-corrected, intrinsic
distributions of the values of $\sigma$, $r_{sH}$, and $f_H$ for $3
求助内容：
应助结果提醒方式：
京公网安备 11010802042870号
