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Aligned metal absorbers and the ultraviolet background at the end of reionization
New Mexico State Univ, Dept Astron, Las Cruces, NM 88001 USA..
New Mexico State Univ, Dept Astron, Las Cruces, NM 88001 USA..
Univ Colorado, Dept Astrophys & Planetary Sci, CASA, 389-UCB, Boulder, CO 80309 USA..
Royal Observ, Inst Astron, Edinburgh EH9 3HJ, Midlothian, Scotland.;Univ Western Cape, Dept Phys & Astron, ZA-7535 Cape Town, South Africa..
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2018 (English)In: Monthly notices of the Royal Astronomical Society, ISSN 0035-8711, E-ISSN 1365-2966, Vol. 475, no 4, p. 4717-4727Article in journal (Refereed) Published
Abstract [en]

We use observations of spatially aligned C II, C IV, Si II, Si IV, and O I absorbers to probe the slope and intensity of the ultraviolet background (UVB) at z similar to 6. We accomplish this by comparing observations with predictions from a cosmological hydrodynamic simulation using three trial UVBs applied in post-processing: a spectrally soft, fluctuating UVB calculated using multifrequency radiative transfer; a soft, spatially uniform UVB; and a hard, spatially uniform 'quasars-only' model. When considering our paired high-ionization absorbers (C IV/Si IV), the observed statistics strongly prefer the hard, spatially uniform UVB. This echoes recent findings that cosmological simulations generically underproduce strong C IV absorbers at z > 5. A single low/high ionization pair (Si II/Si IV), by contrast, shows a preference for the HM12 UVB, whereas two more (C II/C IV and O I/C IV) show no preference for any of the three UVBs. Despite this, future observations of specific absorbers, particularly Si IV/C IV, with next-generation telescopes probing to lower column densities should yield tighter constraints on the UVB.

Place, publisher, year, edition, pages
Oxford University Press, 2018. Vol. 475, no 4, p. 4717-4727
Keywords [en]
galaxies: evolution, galaxies: formation, galaxies: high-redshift, intergalactic medium, quasars: absorption lines, cosmology: theory
National Category
Astronomy, Astrophysics and Cosmology
Identifiers
URN: urn:nbn:se:uu:diva-351692DOI: 10.1093/mnras/sty156ISI: 000428835700029OAI: oai:DiVA.org:uu-351692DiVA, id: diva2:1213073
Available from: 2018-06-04 Created: 2018-06-04 Last updated: 2018-06-04Bibliographically approved

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Zackrisson, Erik

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