Lochhaas, C;
Weinberg, DH;
Peirani, S;
Dubois, Y;
Colombi, S;
Blaizot, J;
Font-Ribera, A;
... Devriendt, J; + view all
(2016)
Modeling Lyman-α Forest Cross-Correlations with LyMAS.
Monthly Notices of the Royal Astronomical Society (MNRAS)
, 461
(4)
pp. 4353-4373.
10.1093/mnras/stw1646.
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Abstract
We use the Lyα Mass Association Scheme (LyMAS) to predict cross-correlations at z = 2.5 between dark matter haloes and transmitted flux in the Lyα forest, and compare to cross-correlations measured for quasars and damped Lyα systems (DLAs) from the Baryon Oscillation Spectroscopic Survey (BOSS) by Font-Ribera et al. We calibrate LyMAS using Horizon-AGN hydrodynamical cosmological simulations of a (100 h− 1 Mpc)3 comoving volume. We apply this calibration to a (1 h− 1 Gpc)3 simulation realized with 20483 dark matter particles. In the 100 h− 1 Mpc box, LyMAS reproduces the halo-flux correlations computed from the full hydrodynamic gas distribution very well. In the 1 h− 1 Gpc box, the amplitude of the large-scale cross-correlation tracks the halo bias bh as expected. We provide empirical fitting functions that describe our numerical results. In the transverse separation bins used for the BOSS analyses, LyMAS cross-correlation predictions follow linear theory accurately down to small scales. Fitting the BOSS measurements requires inclusion of random velocity errors; we find best-fitting rms velocity errors of 399 and 252 km s−1 252 km s−1 for quasars and DLAs, respectively. We infer bias-weighted mean halo masses of Mh/1012 h−1M⊙=2.19+0.16−0.15 Mh/1012 h−1M⊙=2.19−0.15+0.16 and 0.69+0.16−0.14 0.69−0.14+0.16 for the host haloes of quasars and DLAs, with ∼0.2 dex systematic uncertainty associated with redshift evolution, intergalactic medium parameters, and selection of data fitting range.
| Type: | Article |
|---|---|
| Title: | Modeling Lyman-α Forest Cross-Correlations with LyMAS |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1093/mnras/stw1646 |
| Publisher version: | http://dx.doi.org/10.1093/mnras/stw1646 |
| Language: | English |
| Additional information: | This version is the version of record. For information on re-use, please refer to the publisher’s terms and conditions. |
| Keywords: | Large-scale structure of Universe |
| UCL classification: | UCL UCL > Provost and Vice Provost Offices > UCL BEAMS UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Physics and Astronomy |
| URI: | https://discovery-pp.ucl.ac.uk/id/eprint/1550069 |
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