Giant Lyman-alpha Nebulae in the Illustris Simulation. Gronke, M. & Bird, S. The Astrophysical Journal, 835(2):207, 2017. ![Giant Lyman-alpha Nebulae in the Illustris Simulation [link]](https://bibbase.org/img/filetypes/link.svg "link")
Paper doi abstract bibtex Several “giant” Ly α nebulae with an extent ≳300 kpc and observed Ly α luminosity of ≳10 44 erg s −1 cm −2 arcsec −2 have recently been detected, and it has been speculated that their presence hints at a substantial cold gas reservoir in small cool clumps not resolved in modern hydrodynamical simulations. We use the Illustris simulation to predict the Ly α emission emerging from large halos ( M \textgreater 10 11.5 M ⊙ ) at z ∼ 2 and thus test this model. We consider both active galactic nucleus (AGN) and star driven ionization, and compare the simulated surface brightness maps, profiles, and Ly α spectra to a model where most gas is clumped below the simulation resolution scale. We find that with Illustris, no additional clumping is necessary to explain the extents, luminosities, and surface brightness profiles of the “giant Ly α nebulae” observed. Furthermore, the maximal extents of the objects show a wide spread for a given luminosity and do not correlate significantly with any halo properties. We also show how the detected size depends strongly on the employed surface brightness cutoff, and predict that further examples of such objects will be found in the near future.
@article{gronke_giant_2017,
title = {Giant {Lyman}-alpha {Nebulae} in the {Illustris} {Simulation}},
volume = {835},
issn = {0004-637X},
url = {http://stacks.iop.org/0004-637X/835/i=2/a=207},
doi = {10.3847/1538-4357/835/2/207},
abstract = {Several “giant” Ly α nebulae with an extent ≳300 kpc and observed Ly α luminosity of ≳10 44 erg s −1 cm −2 arcsec −2 have recently been detected, and it has been speculated that their presence hints at a substantial cold gas reservoir in small cool clumps not resolved in modern hydrodynamical simulations. We use the Illustris simulation to predict the Ly α emission emerging from large halos ( M {\textgreater} 10 11.5 M ⊙ ) at z ∼ 2 and thus test this model. We consider both active galactic nucleus (AGN) and star driven ionization, and compare the simulated surface brightness maps, profiles, and Ly α spectra to a model where most gas is clumped below the simulation resolution scale. We find that with Illustris, no additional clumping is necessary to explain the extents, luminosities, and surface brightness profiles of the “giant Ly α nebulae” observed. Furthermore, the maximal extents of the objects show a wide spread for a given luminosity and do not correlate significantly with any halo properties. We also show how the detected size depends strongly on the employed surface brightness cutoff, and predict that further examples of such objects will be found in the near future.},
language = {en},
number = {2},
urldate = {2017-04-25},
journal = {The Astrophysical Journal},
author = {Gronke, Max and Bird, Simeon},
year = {2017},
pages = {207},
}
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