@article{cain_short_2021,
	title = {A short mean free path at \$z=6\$ favors late and rapid reionization by faint galaxies},
	volume = {2105},
	url = {http://adsabs.harvard.edu/abs/2021arXiv210510511C},
	abstract = {Recent measurements of the ionizing photon mean free path 
(\${\textbackslash}lambda\_\{912\}{\textasciicircum}\{{\textbackslash}rm mfp\}\$) at \$5 {\textless} z {\textless} 6\$ suggest that the IGM
was rapidly evolving at those times. We use radiative transfer
simulations to explore the implications for reionization, with a focus
on the short value of \${\textbackslash}lambda\_\{912\}{\textasciicircum}\{{\textbackslash}rm mfp\} = 3.57{\textasciicircum}\{+3.09\}\_\{-2.14\}\$
cMpc/\$h\$ at \$z=6\$. We introduce a model for sub-resolution ionizing
photon sinks based on radiative hydrodynamics simulations of small-scale
IGM clumping. We argue that the rapid evolution in \${\textbackslash}lambda\_\{912\}{\textasciicircum}\{\vphantom{\}}{\textbackslash}rm
mfp\vphantom{\{}\}\$ at \$z=5-6\$, together with constraints on the metagalactic ionizing
background, favors a late reionization process in which the neutral
fraction evolved rapidly in the latter half. We also argue that the
short \${\textbackslash}lambda\_\{912\}{\textasciicircum}\{{\textbackslash}rm mfp\}(z=6)\$ points to faint galaxies as the
primary drivers of reionizaton. Our preferred model, with
\${\textbackslash}lambda\_\{912\}{\textasciicircum}\{{\textbackslash}rm mfp\}(z=6) = 6.5\$ Mpc/\$h\$, has a midpoint of \$z= 7.1\$
and ends at \$z= 5.1\$. It requires 3 ionizing photons per H atom to
complete reionization and a LyC photon production efficiency of
\${\textbackslash}log(f{\textasciicircum}\{{\textbackslash}rm eff\}\_\{{\textbackslash}rm esc\} {\textbackslash}xi\_\{{\textbackslash}rm ion\}/[{\textbackslash}mathrm\{erg\}{\textasciicircum}\{-1\}
{\textbackslash}mathrm\{Hz\}]) = 24.8\$ at \$z{\textgreater}6\$. Recovering \${\textbackslash}lambda\_\{912\}{\textasciicircum}\{\vphantom{\}}{\textbackslash}rm
mfp\vphantom{\{}\}(z=6)\$ as low as the measured central value may require an increase
in IGM clumpiness beyond predictions from simulations, with a
commensurate increase in the photon budget.},
	urldate = {2021-06-04},
	journal = {arXiv e-prints},
	author = {Cain, Christopher and D'Aloisio, Anson and Gangolli, Nakul and Becker, George D.},
	month = may,
	year = {2021},
	keywords = {Astrophysics - Cosmology and Nongalactic Astrophysics},
	pages = {arXiv:2105.10511},
}

{"_id":"rB25hHRti3P2Ay4he","bibbaseid":"cain-daloisio-gangolli-becker-ashortmeanfreepathatz6favorslateandrapidreionizationbyfaintgalaxies-2021","author_short":["Cain, C.","D'Aloisio, A.","Gangolli, N.","Becker, G. D."],"bibdata":{"bibtype":"article","type":"article","title":"A short mean free path at \\$z=6\\$ favors late and rapid reionization by faint galaxies","volume":"2105","url":"http://adsabs.harvard.edu/abs/2021arXiv210510511C","abstract":"Recent measurements of the ionizing photon mean free path (\\${\\textbackslash}lambda_\\{912\\}{\\textasciicircum}\\{{\\textbackslash}rm mfp\\}\\$) at \\$5 {\\textless} z {\\textless} 6\\$ suggest that the IGM was rapidly evolving at those times. We use radiative transfer simulations to explore the implications for reionization, with a focus on the short value of \\${\\textbackslash}lambda_\\{912\\}{\\textasciicircum}\\{{\\textbackslash}rm mfp\\} = 3.57{\\textasciicircum}\\{+3.09\\}_\\{-2.14\\}\\$ cMpc/\\$h\\$ at \\$z=6\\$. We introduce a model for sub-resolution ionizing photon sinks based on radiative hydrodynamics simulations of small-scale IGM clumping. We argue that the rapid evolution in \\${\\textbackslash}lambda_\\{912\\}{\\textasciicircum}\\{p̌hantom{\\}}{\\textbackslash}rm mfpp̌hantom{\\{}\\}\\$ at \\$z=5-6\\$, together with constraints on the metagalactic ionizing background, favors a late reionization process in which the neutral fraction evolved rapidly in the latter half. We also argue that the short \\${\\textbackslash}lambda_\\{912\\}{\\textasciicircum}\\{{\\textbackslash}rm mfp\\}(z=6)\\$ points to faint galaxies as the primary drivers of reionizaton. Our preferred model, with \\${\\textbackslash}lambda_\\{912\\}{\\textasciicircum}\\{{\\textbackslash}rm mfp\\}(z=6) = 6.5\\$ Mpc/\\$h\\$, has a midpoint of \\$z= 7.1\\$ and ends at \\$z= 5.1\\$. It requires 3 ionizing photons per H atom to complete reionization and a LyC photon production efficiency of \\${\\textbackslash}log(f{\\textasciicircum}\\{{\\textbackslash}rm eff\\}_\\{{\\textbackslash}rm esc\\} {\\textbackslash}xi_\\{{\\textbackslash}rm ion\\}/[{\\textbackslash}mathrm\\{erg\\}{\\textasciicircum}\\{-1\\} {\\textbackslash}mathrm\\{Hz\\}]) = 24.8\\$ at \\$z{\\textgreater}6\\$. Recovering \\${\\textbackslash}lambda_\\{912\\}{\\textasciicircum}\\{p̌hantom{\\}}{\\textbackslash}rm mfpp̌hantom{\\{}\\}(z=6)\\$ as low as the measured central value may require an increase in IGM clumpiness beyond predictions from simulations, with a commensurate increase in the photon budget.","urldate":"2021-06-04","journal":"arXiv e-prints","author":[{"propositions":[],"lastnames":["Cain"],"firstnames":["Christopher"],"suffixes":[]},{"propositions":[],"lastnames":["D'Aloisio"],"firstnames":["Anson"],"suffixes":[]},{"propositions":[],"lastnames":["Gangolli"],"firstnames":["Nakul"],"suffixes":[]},{"propositions":[],"lastnames":["Becker"],"firstnames":["George","D."],"suffixes":[]}],"month":"May","year":"2021","keywords":"Astrophysics - Cosmology and Nongalactic Astrophysics","pages":"arXiv:2105.10511","bibtex":"@article{cain_short_2021,\n\ttitle = {A short mean free path at \\$z=6\\$ favors late and rapid reionization by faint galaxies},\n\tvolume = {2105},\n\turl = {http://adsabs.harvard.edu/abs/2021arXiv210510511C},\n\tabstract = {Recent measurements of the ionizing photon mean free path \n(\\${\\textbackslash}lambda\\_\\{912\\}{\\textasciicircum}\\{{\\textbackslash}rm mfp\\}\\$) at \\$5 {\\textless} z {\\textless} 6\\$ suggest that the IGM\nwas rapidly evolving at those times. We use radiative transfer\nsimulations to explore the implications for reionization, with a focus\non the short value of \\${\\textbackslash}lambda\\_\\{912\\}{\\textasciicircum}\\{{\\textbackslash}rm mfp\\} = 3.57{\\textasciicircum}\\{+3.09\\}\\_\\{-2.14\\}\\$\ncMpc/\\$h\\$ at \\$z=6\\$. We introduce a model for sub-resolution ionizing\nphoton sinks based on radiative hydrodynamics simulations of small-scale\nIGM clumping. We argue that the rapid evolution in \\${\\textbackslash}lambda\\_\\{912\\}{\\textasciicircum}\\{\\vphantom{\\}}{\\textbackslash}rm\nmfp\\vphantom{\\{}\\}\\$ at \\$z=5-6\\$, together with constraints on the metagalactic ionizing\nbackground, favors a late reionization process in which the neutral\nfraction evolved rapidly in the latter half. We also argue that the\nshort \\${\\textbackslash}lambda\\_\\{912\\}{\\textasciicircum}\\{{\\textbackslash}rm mfp\\}(z=6)\\$ points to faint galaxies as the\nprimary drivers of reionizaton. Our preferred model, with\n\\${\\textbackslash}lambda\\_\\{912\\}{\\textasciicircum}\\{{\\textbackslash}rm mfp\\}(z=6) = 6.5\\$ Mpc/\\$h\\$, has a midpoint of \\$z= 7.1\\$\nand ends at \\$z= 5.1\\$. It requires 3 ionizing photons per H atom to\ncomplete reionization and a LyC photon production efficiency of\n\\${\\textbackslash}log(f{\\textasciicircum}\\{{\\textbackslash}rm eff\\}\\_\\{{\\textbackslash}rm esc\\} {\\textbackslash}xi\\_\\{{\\textbackslash}rm ion\\}/[{\\textbackslash}mathrm\\{erg\\}{\\textasciicircum}\\{-1\\}\n{\\textbackslash}mathrm\\{Hz\\}]) = 24.8\\$ at \\$z{\\textgreater}6\\$. Recovering \\${\\textbackslash}lambda\\_\\{912\\}{\\textasciicircum}\\{\\vphantom{\\}}{\\textbackslash}rm\nmfp\\vphantom{\\{}\\}(z=6)\\$ as low as the measured central value may require an increase\nin IGM clumpiness beyond predictions from simulations, with a\ncommensurate increase in the photon budget.},\n\turldate = {2021-06-04},\n\tjournal = {arXiv e-prints},\n\tauthor = {Cain, Christopher and D'Aloisio, Anson and Gangolli, Nakul and Becker, George D.},\n\tmonth = may,\n\tyear = {2021},\n\tkeywords = {Astrophysics - Cosmology and Nongalactic Astrophysics},\n\tpages = {arXiv:2105.10511},\n}\n\n","author_short":["Cain, C.","D'Aloisio, A.","Gangolli, N.","Becker, G. D."],"key":"cain_short_2021","id":"cain_short_2021","bibbaseid":"cain-daloisio-gangolli-becker-ashortmeanfreepathatz6favorslateandrapidreionizationbyfaintgalaxies-2021","role":"author","urls":{"Paper":"http://adsabs.harvard.edu/abs/2021arXiv210510511C"},"keyword":["Astrophysics - Cosmology and Nongalactic Astrophysics"],"metadata":{"authorlinks":{}}},"bibtype":"article","biburl":"https://bibbase.org/zotero/polyphant","dataSources":["7gvjSdWrEu7z5vjjj"],"keywords":["astrophysics - cosmology and nongalactic astrophysics"],"search_terms":["short","mean","free","path","favors","late","rapid","reionization","faint","galaxies","cain","d'aloisio","gangolli","becker"],"title":"A short mean free path at \\$z=6\\$ favors late and rapid reionization by faint galaxies","year":2021}