An updated analytic model for the attenuation by the intergalactic medium

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 $z>0.5$. The new model predicts less (or more) Ly$\alpha$ attenuation for $z\simeq 3$--5 ($z>6$) sources through usual broad-band filters relative to the original Madau model. This may cause a systematic difference in the photometric redshift estimates, which is, however, still as small as about 0.05. 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.

17 pages, 10 figures, MNRAS accepted. A code written in Fortran 90 is available at http://www.las.osaka-sandai.ac.jp/~inoue/ANAIGM/ANAIGM.tar.gz

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• Ionizing Radiation Escape from Low-Redshift Galaxies and Its Connection to Cosmic Reionization
• The Role of Dust, UV Luminosity and Large-scale Environment on the Escape of Lya Photons: A Case Study of a Protocluster field at z = 3.1
• JWST Discovery of a High-Redshift Tidal Disruption Event Candidate in COSMOS-Web
• The miniJPAS Survey: Detection of double-core Lyα morphology of two high-redshift (z>3) QSOs
• The probabilistic random forest applied to the QUBRICS survey: improving the selection of high-redshift quasars with synthetic data
• pop-cosmos: Insights from generative modeling of a deep, infrared-selected galaxy population
• A unique window into the Epoch of Reionisation: A double-peaked Lyman-$\alpha$ emitter in the proximity zone of a quasar at $z\sim 6.6$
• The Ly$\alpha$ and Continuum Origins Survey. III. Investigating the Link between Galaxy Morphology, Merger Properties and LyC Escape
• The PAU Survey: The quasar UV and Ly$\alpha$ luminosity functions at $2.7<z<5.3$
• Upcoming searches for decaying dark matter with ULTRASAT ultraviolet maps
• The quasar luminosity function at $z\sim 5$ via deep learning and Bayesian information criterion
• Emission Line Galaxies in the SHARDS Hubble Frontier Fields II: Limits on Lyman-Continuum Escape Fractions of Lensed Emission Line Galaxies at Redshifts 2 < z < 3.5
• Forecasts for Broadband Intensity Mapping of the Ultraviolet-Optical Background with CASTOR and SPHEREx
• Deeper detection limits in astronomical imaging using self-supervised spatiotemporal denoising
• Physical conditions in high$-$z optically thin C III absorbers: Origin of cloud sizes and associated correlations
• Model-independent Reconstruction of UV Luminosity Function and Reionization Epoch
• Cloudy with a chance of starshine: Possible photometric signatures of nebular-dominated emission in $1.5<z<8.5$ JADES galaxies
• Constraining $z\lesssim 2$ ultraviolet emission with the upcoming ULTRASAT satellite
• Impact of redshift distribution uncertainties on Lyman-break galaxy cosmological parameter inference
• Observing galaxy mergers at the epoch of reionization
• What can we learn about Reionization astrophysical parameters using Gaussian Process Regression?
• Physical conditions and redshift evolution of optically thin C III absorbers: Low-z sample
• REBELS-IFU: Spatially Resolved Ionizing Photon Production Efficiencies of 12 Bright Galaxies in the Epoch of Reionization
• The Parallel Ionizing Emissivity Survey (PIE). I. Survey design and selection of candidate Lyman Continuum leakers at 3.1<z<3.5
• Flexible Simulation Based Inference for Galaxy Photometric Fitting with Synthesizer
• Unraveling the Lyman Continuum Emission of Ion3: Insights from HST multi-band imaging and X-Shooter spectroscopy
• A resolved Lyman-Alpha profile with doubly peaked emission at z~7
• Kinematic analysis of an Ultra-Strong MgII absorber at z~1.13 linking to Circumgalactic Gas Structures
• Prospects for constraining quasar ages with fiber spectrographs: quasar-induced Ly$\alpha$ emission from the intergalactic medium
• A Lyman continuum analysis for $\sim 100$ galaxies at $z_{\text{spec}}\sim 3$ in the Abell 2744 Cluster Field
• Black-hole mass estimation through accretion disk spectral fitting for high-redshift blazars
• Deep JWST spectroscopy of galaxies in a candidate ionized bubble at $z=8.7$: probing reionization at pMpc scales with Ly$\alpha$ emission
• Out of oxygen: Extremely metal-poor galaxy candidates identified at $2.5<z<6.5$ with deep JADES medium-band imaging
• Euclid: Early Release Observations. Weak gravitational lensing analysis of Abell 2390
• Far-infrared observations of dust in Ly$\alpha$ emitters at z=2-6
• The Local Galactic Transient Survey Applied to an Optical Search for Directed Intelligence
• Lyman continuum observations across cosmic time: recent developments, future requirements
• The Nature of High-Redshift Massive Quiescent Galaxies -- Searching for RUBIES-UDS-QG-z7 in FLARES
• Ciii]$\lambda 1909$ emission as an alternative to Ly$\alpha$ in the reionization era: the dependence of Ciii] and Ly$\alpha$ at $3<z<4$ from the VANDELS survey