2021
DOI: 10.1093/mnras/stab2597
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Probing the physical properties of the intergalactic medium using blazars

Abstract: We use Swift blazar spectra to estimate the key intergalactic medium (IGM) properties of hydrogen column density (${N} {\rm \small {HXIGM}}$), metallicity and temperature over a redshift range of 0.03 ≤ z ≤ 4.7, using a collisional ionisation equilibrium (CIE) model for the ionised plasma. We adopted a conservative approach to the blazar continuum model given its intrinsic variability and use a range of power law models. We subjected our results to a number of tests and found that the ${N}{\rm \small {hxigm}}$… Show more

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Cited by 6 publications
(13 citation statements)
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“…They both calculate mean hydrogen densities of 𝑛 0 ∼ 10 −7 cm −3 (at 𝑧 = 0) in the WHIM and temperatures of log(𝑇/𝐾)∼6, which are consistent with the quantities expected of such a medium (see simulations in e.g. Cen & Ostriker 1999Davé & Oppenheimer 2007;Schaye et al 2015;Martizzi et al 2019. Dalton et al (2021 also combine their blazar data with that of gamma-ray bursts to find that their results agree over a wide range in redshift, and show that the WHIM column density is not related to variations in the flux or spectra of their sources.…”
Section: The Curious Case Of Pks 2126-15: An Absorbed Fsrq?supporting
confidence: 68%
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“…They both calculate mean hydrogen densities of 𝑛 0 ∼ 10 −7 cm −3 (at 𝑧 = 0) in the WHIM and temperatures of log(𝑇/𝐾)∼6, which are consistent with the quantities expected of such a medium (see simulations in e.g. Cen & Ostriker 1999Davé & Oppenheimer 2007;Schaye et al 2015;Martizzi et al 2019. Dalton et al (2021 also combine their blazar data with that of gamma-ray bursts to find that their results agree over a wide range in redshift, and show that the WHIM column density is not related to variations in the flux or spectra of their sources.…”
Section: The Curious Case Of Pks 2126-15: An Absorbed Fsrq?supporting
confidence: 68%
“…As shown in Eitan & Behar (2013), high redshift blazars, most of which are FSRQs, are often absorbed. Two recent studies by Arcodia et al (2018) and Dalton et al (2021) find that absorption in excess to the Galactic absorption, as opposed to intrinsic breaks, is preferred to fully explain the hardening in their respective samples of FSRQs. They successfully describe the excess X-ray absorption as occurring due to the highly ionized "warm-hot" intergalactic medium (WHIM), which would also account for the lack of absorption seen in the optical/UV.…”
Section: The Curious Case Of Pks 2126-15: An Absorbed Fsrq?mentioning
confidence: 99%
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