The DOI matches its Crossref record; 104 of the 104 references it cites were found in a registry or an index.
A NEW CALCULATION OF THE IONIZING BACKGROUND SPECTRUM AND THE EFFECTS OF He II REIONIZATION
Open accessAbstract
The ionizing background determines the ionization balance and the thermodynamics of the cosmic gas. It is therefore a fundamental ingredient to theoretical and empirical studies of both the intergalactic medium (IGM) and galaxy formation. We present here a new calculation of its spectrum that satisfies the empirical constraints we recently obtained by combining state-of-the-art luminosity functions and intergalactic opacity measurements. In our preferred model, star-forming galaxies and quasars each contribute substantially to the H i ionizing field at z < 3, with galaxies rapidly overtaking quasars at higher redshifts as quasars become rarer. In addition to our fiducial model, we explore the physical dependences of the calculated background and clarify how recombination emission contributes to the ionization rates. We find that recombinations do not simply boost the ionization rates by the number of re-emitted ionizing photons as many of these rapidly redshift below the ionization edges and have a distribution of energies. A simple analytic model that captures the main effects seen in our numerical radiative transfer calculations is given. Finally, we discuss the effects of He ii reionization by quasars on both the spectrum of the ionizing background and on the thermal history of the IGM. In regions that have yet to be reionized, the spectrum is expected to be almost completely suppressed immediately above 54.4 eV, while a background of higher energy (≳0.5 keV) photons permeates the entire universe owing to the frequency dependence of the photoionization cross section. We provide an analytical model of the heat input during He ii reionization and its effects on the temperature–density relation.
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The cosmological simulation code gadget-2
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Self-citationTheoretical Challenges in Galaxy Formation
Naab, T., & Ostriker, J. P. (2017) · Annual Review of Astronomy and Astrophysics · doi:10.1146/annurev-astro-081913-040019 · Cited by 722
The Auriga Project: the properties and formation mechanisms of disc galaxies across cosmic time
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The CAMELS Project: Cosmology and Astrophysics with Machine-learning Simulations
Villaescusa-Navarro, F., Anglés-Alcázar, D., Genel, S., Spergel, D. N., S. Somerville, R., Dave, R., Pillepich, A., Hernquist, L., Nelson, D., Torrey, P., et al. (2021) · The Astrophysical Journal · doi:10.3847/1538-4357/abf7ba · Cited by 304
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Metadata
- Authors
- Faucher-Giguère, C.-A., Lidz, A., Zaldarriaga, M., & Hernquist, L.
- Venue
- The Astrophysical Journal
- Publisher
- American Astronomical Society
- Published
- 2009-09-09
- Volume
- 703
- Issue
- 2
- Pages
- 1416-1443
- ISSN
- 0004-637X (ISSN-L)
- 1538-4357
- OpenAlex
- W1966671643
- Cited by
- 699
- References
- 104
- FWCI
- 9.08
- Type
- journal article
- Language
- en
- Open access
- bronze
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- Faucher-Giguère, C.-A., Lidz, A., Zaldarriaga, M., & Hernquist, L. (2009). A NEW CALCULATION OF THE IONIZING BACKGROUND SPECTRUM AND THE EFFECTS OF He II REIONIZATION. The Astrophysical Journal. https://doi.org/10.1088/0004-637x/703/2/1416
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