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Simulating MOS science on the ELT: Ly$\alpha$ forest tomography by Japelj, J.; Laigle, C.; Puech, M.; Pichon, C.; Rahmani, H.; Dubois, Y.; Devriendt, J. E. G.; Petitjean, P.; Hammer, F.; Gendron, E.; Kaper, L.; Morris, S.; Pirzkal, N.; Sánchez-Janssen, R.; Slyz, A.; Vergani, S. D.; Yang, Y. is a scholarly article available to read on EtoBox.

What is Simulating MOS science on the ELT: Ly$\alpha$ forest tomography about?

Mapping of the large-scale structure through cosmic time has numerous applications in the studies of cosmology and galaxy evolution. At $z > 2$, the structure can be traced by the neutral intergalactic medium (IGM) by way of observing the Ly$\alpha$, forest towards densely-sampled lines-of-sight of bright background sources, such as quasars and star forming galaxies. We investigate the scientific potential of MOSAIC, a planned multi-object spectrograph on the European Extremely Large Telescope (ELT), for the 3D mapping of the IGM at $z \gtrsim 3$. We simulate a survey of $3 \lesssim z \lesssim 4$ galaxies down to a limiting magnitude of $m_{r}\sim 25.5$ mag in an area of 1 degree$^2$ in the sky. Galaxies and their spectra (including the line-of-sight Ly$\alpha$ absorption) are taken from the lightcone extracted from the Horizon-AGN cosmological hydrodynamical simulation. The quality of the reconstruction of the original density field is studied for different spectral resolutions and signal-to-noise ratios of the spectra. We demonstrate that the minimum $S/N$ (per resolution element) of the faintest galaxies that such survey has to reach is $S/N = 4$. We show that a survey with such

Author

Japelj, J.; Laigle, C.; Puech, M.; Pichon, C.; Rahmani, H.; Dubois, Y.; Devriendt, J. E. G.; Petitjean, P.; Hammer, F.; Gendron, E.; Kaper, L.; Morris, S.; Pirzkal, N.; Sánchez-Janssen, R.; Slyz, A.; Vergani, S. D.; Yang, Y.

Published

2019

Language

EN