%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 }