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- W3100132670 abstract "We study the internal structure of the Circum-Galactic Medium (CGM), using 29 spectra of 13 gravitationally lensed quasars with image separation angles of a few arcseconds, which correspond to 100 pc to 10 kpc in physical distances. After separating metal absorption lines detected in the spectra into high-ions with ionization parameter (IP) $>$ 40 eV and low-ions with IP $<$ 20 eV, we find that i) the fraction of absorption lines that are detected in only one of the lensed images is larger for low-ions ($sim$16%) than high-ions ($sim$2%), ii) the fractional difference of equivalent widths ($EW$s) between the lensed images is almost same (${rm d}EW$ $sim$ 0.2) for both groups although the low-ions have a slightly larger variation, and iii) weak low-ion absorbers tend to have larger ${rm d}EW$ compared to weak high-ion absorbers. We construct simple models to reproduce these observed properties and investigate the distribution of physical quantities such as size and location of absorbers, using some free parameters. Our best models for absorbers with high-ions and low-ions suggest that i) an overall size of the CGM is at least $sim$ 500 kpc, ii) a size of spherical clumpy cloud is $sim$ 1 kpc or smaller, and iii) only high-ion absorbers can have diffusely distributed homogeneous component throughout the CGM. We infer that a high ionization absorber distributes almost homogeneously with a small-scale internal fluctuation, while a low ionization absorber consists of a large number of small-scale clouds in the diffusely distributed higher ionized region. This is the first result to investigate the internal small-scale structure of the CGM, based on the large number of gravitationally lensed quasar spectra." @default.
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- W3100132670 date "2017-12-15" @default.
- W3100132670 modified "2023-10-18" @default.
- W3100132670 title "Resolving the Internal Structure of Circumgalactic Medium Using Gravitationally Lensed Quasars," @default.
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- W3100132670 doi "https://doi.org/10.3847/1538-4357/aa9a3a" @default.
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