The impact of Lyman-<i>α</i> radiative transfer on large-scale clustering in the Illustris simulation

Behrens, Christoph; Byrohl, Chris; Saito, Shun; Niemeyer, J. C.

doi:10.1051/0004-6361/201731783

Cited by 33 publications

(30 citation statements)

References 63 publications

(52 reference statements)

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“…This holds despite the fact that we have no physical model for f (N HI , X) and only initial efforts to estimate it within cosmological simulations (e.g. McQuinn et al 2011;Rahmati et al 2013Rahmati et al , 2015Behrens et al 2018;Rogers et al 2018a,b).…”

Section: Constraints On the High Redshift Column Density Distributionmentioning

confidence: 98%

Imprints of the first billion years: Lyman limit systems atz∼ 5

Crighton

Prochaska

Murphy

et al. 2018

Monthly Notices of the Royal Astronomical Society

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Lyman Limit systems (LLSs) trace the low-density circumgalactic medium and the most dense regions of the intergalactic medium, so their number density and evolution at high redshift, just after reionisation, are important to constrain. We present a survey for LLSs at high redshifts, z LLS = 3.5-5.4, in the homogeneous dataset of 153 optical quasar spectra at z ∼ 5 from the Giant Gemini GMOS survey. Our analysis includes detailed investigation of survey biases using mock spectra which provide important corrections to the raw measurements. We estimate the incidence of LLSs per unit redshift at z ≈ 4.4 to be (z) = 2.6 ± 0.4. Combining our results with previous surveys at z LLS < 4, the best-fit power-law evolution is (z) = * [(1 + z)/4] α with * = 1.46 ± 0.11 and α = 1.70 ± 0.22 (68% confidence intervals). Despite hints in previous z LLS < 4 results, there is no indication for a deviation from this single power-law soon after reionization. Finally, we integrate our new results with previous surveys of the intergalactic and circumgalactic media to constrain the hydrogen column density distribution function, f (N HI , X), over 10 orders of magnitude. The data at z ∼ 5 are not well described by the f (N HI , X) model previously reported for z ∼ 2-3 (after re-scaling) and a 7-pivot model fitting the full z ∼ 2-5 dataset is statistically unacceptable. We conclude that there is significant evolution in the shape of f (N HI , X) over this ∼2 billion year period.

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Section: Constraints On the High Redshift Column Density Distributionmentioning

confidence: 98%

Imprints of the first billion years: Lyman limit systems atz∼ 5

Crighton

Prochaska

Murphy

et al. 2018

Monthly Notices of the Royal Astronomical Society

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“…The non-gravitational bias in the large-scale clustering of LAEs by the Lyα RT (Zheng et al 2011;Behrens et al 2018) may complicate a cosmological analysis in HETDEX. In this paper, we showed that the impact of the large-scale gaseous environments around galaxies on Lyα line flux can be estimated from galaxy-Lyα forest cross-correlation data.…”

Section: Lyα Rt Effect On the Large-scale Lae Clusteringmentioning

confidence: 99%

A new model framework for circumgalactic Lyα radiative transfer constrained by galaxy-Lyα forest clustering

Kakiichi

Dijkstra

2018

Monthly Notices of the Royal Astronomical Society

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We present a new perturbative approach to "constrained Lyα radiative transfer" (RT) through the circum-and inter-galactic medium (CGM and IGM). We constrain the H I content and kinematics of the CGM and IGM in a physically motivated model, using the galaxy-Lyα forest clustering data from spectroscopic galaxy surveys in QSO fields at z ∼ 2 − 3. This enables us to quantify the impact of the CGM/IGM on Lyα emission in an observationally constrained, realistic cosmological environment. Our model predicts that the CGM and IGM at these redshifts transmit ≈ 80 % of Lyα photons after having escaped from galaxies. This implies that while the inter-stellar medium primarily regulates Lyα escape, the CGM has a non-negligible impact on the observed Lyα line properties and the inferred Lyα escape fraction, even at z ∼ 2 − 3. Lyα scattering in the CGM and IGM further introduces an environmental dependence in the (apparent) Lyα escape fraction, and the observed population of Lyα emitting galaxies: the CGM/IGM more strongly suppresses direct Lyα emission from galaxies in overdense regions in the Universe, and redistributes this emission into brighter Lyα haloes. The resulting mean surface brightness profile of the Lyα haloes is generally found to be a powerlaw ∝ r −2.4 . Although our model still contains arbitrariness, our results demonstrate how (integral field) spectroscopic surveys of galaxies in QSO fields constrain circumgalactic Lyα RT, and we discuss the potential of these models for studying CGM physics and cosmology.

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“…Recently, Ref [70]. has found smaller selection effect at lower redshifts 2 < z < 6 from the radiative transfer simulation.…”

mentioning

confidence: 94%

The galaxy power spectrum and bispectrum in redshift space

Desjacques

Jeong

Schmidt

2018

J. Cosmol. Astropart. Phys.

109

149

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We present the complete expression for the next-to-leading (1-loop) order galaxy power spectrum and the leading-order galaxy bispectrum in redshift space in the general bias expansion, or equivalently the effective field theory of biased tracers. We consistently include all line-of-sight dependent selection effects. These are degenerate with many, but not all, of the redshift-space distortion contributions, and have not been consistently derived before. Moreover, we show that, in the framework of effective field theory, a consistent bias expansion in redshift space must include these selection contributions. Physical arguments about the tracer sample considered and its observational selection have to be used to justify neglecting the selection contributions. In summary, the next-to-leading order galaxy power spectrum and leading-order galaxy bispectrum in the general bias expansion are described by 22 parameters, which reduces to 11 parameters if selection effects can be neglected. All contributions to the power spectrum can be written in terms of 28 independent loop integrals.

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The impact of Lyman-α radiative transfer on large-scale clustering in the Illustris simulation

Cited by 33 publications

References 63 publications

Imprints of the first billion years: Lyman limit systems atz∼ 5

Imprints of the first billion years: Lyman limit systems atz∼ 5

A new model framework for circumgalactic Lyα radiative transfer constrained by galaxy-Lyα forest clustering

The galaxy power spectrum and bispectrum in redshift space

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