An updated analytic model for the attenuation by the intergalactic
medium
A. Inoue, I. Shimizu, and I. Iwata. (2014)cite arxiv:1402.0677Comment: 27 pages (referee format), 10 figures, MNRAS submitted.
Abstract
We present an updated version of the so-called Madau model for the
attenuation by the intergalactic neutral hydrogen against the radiation from
distant objects. First, we derive a distribution function of the intergalactic
absorbers from the latest observational statistics of the Ly$\alpha$ forest,
Lyman limit systems, and damped Ly$\alpha$ systems. The distribution function
excellently reproduces the observed redshift evolutions of the Ly$\alpha$
depression and of the mean-free-path of the Lyman continuum simultaneously.
Then, we derive a set of the analytic functions which describe the mean
intergalactic attenuation curve for objects at $z>0.5$. Our new model predicts,
for some redshifts, more than 0.5--1 mag different attenuation magnitudes
through usual broad-band filters relative to the original Madau model. Such a
difference would cause uncertainty of the photometric redshift of 0.2, in
particular, at $z\simeq3$--4. Finally, we find a more than 0.5 mag
overestimation of the Lyman continuum attenuation in the original Madau model
at $z>3$, which causes a significant overcorrection against direct observations
of the Lyman continuum of galaxies.
Description
[1402.0677] An updated analytic model for the attenuation by the intergalactic medium
%0 Generic
%1 inoue2014updated
%A Inoue, Akio K.
%A Shimizu, Ikkoh
%A Iwata, Ikuru
%D 2014
%K igm photometric redshift transmission
%T An updated analytic model for the attenuation by the intergalactic
medium
%U http://arxiv.org/abs/1402.0677
%X We present an updated version of the so-called Madau model for the
attenuation by the intergalactic neutral hydrogen against the radiation from
distant objects. First, we derive a distribution function of the intergalactic
absorbers from the latest observational statistics of the Ly$\alpha$ forest,
Lyman limit systems, and damped Ly$\alpha$ systems. The distribution function
excellently reproduces the observed redshift evolutions of the Ly$\alpha$
depression and of the mean-free-path of the Lyman continuum simultaneously.
Then, we derive a set of the analytic functions which describe the mean
intergalactic attenuation curve for objects at $z>0.5$. Our new model predicts,
for some redshifts, more than 0.5--1 mag different attenuation magnitudes
through usual broad-band filters relative to the original Madau model. Such a
difference would cause uncertainty of the photometric redshift of 0.2, in
particular, at $z\simeq3$--4. Finally, we find a more than 0.5 mag
overestimation of the Lyman continuum attenuation in the original Madau model
at $z>3$, which causes a significant overcorrection against direct observations
of the Lyman continuum of galaxies.
@misc{inoue2014updated,
abstract = {We present an updated version of the so-called Madau model for the
attenuation by the intergalactic neutral hydrogen against the radiation from
distant objects. First, we derive a distribution function of the intergalactic
absorbers from the latest observational statistics of the Ly$\alpha$ forest,
Lyman limit systems, and damped Ly$\alpha$ systems. The distribution function
excellently reproduces the observed redshift evolutions of the Ly$\alpha$
depression and of the mean-free-path of the Lyman continuum simultaneously.
Then, we derive a set of the analytic functions which describe the mean
intergalactic attenuation curve for objects at $z>0.5$. Our new model predicts,
for some redshifts, more than 0.5--1 mag different attenuation magnitudes
through usual broad-band filters relative to the original Madau model. Such a
difference would cause uncertainty of the photometric redshift of 0.2, in
particular, at $z\simeq3$--4. Finally, we find a more than 0.5 mag
overestimation of the Lyman continuum attenuation in the original Madau model
at $z>3$, which causes a significant overcorrection against direct observations
of the Lyman continuum of galaxies.},
added-at = {2014-02-05T10:09:39.000+0100},
author = {Inoue, Akio K. and Shimizu, Ikkoh and Iwata, Ikuru},
biburl = {https://www.bibsonomy.org/bibtex/2e8efe62f0559d13a158757181f42acb1/miki},
description = {[1402.0677] An updated analytic model for the attenuation by the intergalactic medium},
interhash = {208f89b293b5cd94bee6db243d9b61b4},
intrahash = {e8efe62f0559d13a158757181f42acb1},
keywords = {igm photometric redshift transmission},
note = {cite arxiv:1402.0677Comment: 27 pages (referee format), 10 figures, MNRAS submitted},
timestamp = {2014-02-05T10:09:39.000+0100},
title = {An updated analytic model for the attenuation by the intergalactic
medium},
url = {http://arxiv.org/abs/1402.0677},
year = 2014
}