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- W2349016607 abstract "We examine a model for the variable free-free and neutral hydrogen absorption inferred towards the cores of some compact radio galaxies in which a spatially fluctuating medium drifts in front of the source. We relate the absorption-induced intensity fluctuations to the statistics of the underlying opacity fluctuations. We investigate models in which the absorbing medium consists of either discrete clouds or a power-law spectrum of opacity fluctuations. We examine the variability characteristics of a medium comprised of Gaussian-shaped clouds in which the neutral and ionized matter are co-located, and in which the clouds comprise spherical constant-density neutral cores enveloped by ionized sheaths. The cross-power spectrum indicates the spatial relationship between neutral and ionized matter, and distinguishes the two models, with power in the Gaussian model declining as a featureless power-law, but that in the ionized sheath model oscillating between positive and negative values. We show how comparison of the HI and free-free power spectra reveals information on the ionization and neutral fractions of the medium. The background source acts as a low-pass filter of the underlying opacity power spectrum, which limits temporal fluctuations to frequencies $omega < dot{theta}_v / theta_{rm src}$, where $dot{theta}_v$ is the angular drift speed of the matter in front of the source, and it quenches the observability of opacity structures on scales smaller than the source size $theta_{rm src}$. For drift speeds of $sim 10^3,$km s$^{-1}$ and source brightness temperatures $sim 10^{12},$K, this limitation confines temporal opacity fluctuations to timescales of order several months to decades." @default.
- W2349016607 created "2016-06-24" @default.
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- W2349016607 date "2016-05-16" @default.
- W2349016607 modified "2023-10-18" @default.
- W2349016607 title "Absorption variability as a probe of the multiphase interstellar media surrounding active galaxies" @default.
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- W2349016607 doi "https://doi.org/10.1093/mnras/stw1168" @default.
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