New synthesis models of consistent extragalactic background light over cosmic time

Abstract

We present new synthesis models of the extragalactic background light (EBL) from far infra-red (FIR) to TeV gamma-rays, with an emphasis on the extreme ultraviolet (UV) background which is responsible for the observed ionization and thermal state of the intergalactic medium across the cosmic time. Our models use updated values of the star formation rate density and dust attenuation in galaxies, QSO emissivity, and the distribution of H I gas in the IGM. Two of the most uncertain parameters in these models, the escape fraction of H I ionizing photons from galaxies and the spectral energy distribution (SED) of QSOs, are determined to be consistent with the latest measurements of H I and He II photoionization rates, the He II Lyman-alpha effective optical depths, various constraints on H I and He II reionization history and many measurements of the local EBL from soft X-rays till gamma-rays. We calculate the EBL from FIR to TeV gamma-rays by using FIR emissivities from our previous work and constructing an average SED of high-energy emitting QSOs, i.e, type-2 QSOs and blazars. For public use, we also provide the EBL models obtained using different QSO SEDs at extreme-UV energies over a wide range of redshifts. These can be used to quantify uncertainties in the parameters derived from photoionization models and numerical simulations originating from the allowed variations in the UV background radiation.

arXiv comment29 pages, 15 figures, accepted for publication in MNRAS, all EBL tables are available online and included in the latest versions of cloudy software

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• Constraining the ratio of median pixel optical depth profile around z ~ 4 quasars using the longitudinal proximity effect
• Physical conditions in high$-$z optically thin C III absorbers: Origin of cloud sizes and associated correlations
• Physical conditions and redshift evolution of optically thin C III absorbers: Low-z sample
• Measuring photo-ionization rate and mean free path of HeII ionizing photons at $2.5\le z\le 3.6$: Evidence for late and rapid HeII reionization Part-II
• Jeans smoothing of the Ly$\alpha$ forest absorption lines
• An improved model for the effect of correlated Si-III absorption on the one-dimensional Lyman-$\alpha$ forest power spectrum
• Metals and a Search for Molecules in the Distant Universe: Magellan MIKE Observations of sub-DLAs at 2<z<3
• The clustering of C IV and Si IV at the end of reionisation: A perspective from the E-XQR-30 survey
• The thermal history of the intergalactic medium at $3.9\le z\le 4.3$
• Detecting PAHs in high-z galaxies in proxy: Modelling physical conditions in an extremely strong damped Lyman-alpha absorber towards QSO SDSS J1143+1420 at z=2.323
• MeV cosmic-ray electrons modify the TeV pair-beam plasma instability
• One H2 molecule per ten million H-atoms reveals sub-pc scale cold overdensities at z~4
• Kinematic analysis of an Ultra-Strong MgII absorber at z~1.13 linking to Circumgalactic Gas Structures