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- W2006221946 abstract "We present the column densities of heavy elements and dust depletion studies in two strong Mg ii absorption systems at z ∼ 1.4 displaying the 2175 Å dust extinction feature. Column densities are measured from low-ionization absorption lines using an Apparent Optical Depth Method on the Keck/ESI spectra. We find that the dust depletion patterns resemble that of cold diffuse clouds in the Milky Way (MW). The values, [Fe/Zn] ≈−1.5 and [Si/Zn]<−0.67, are among the highest dust depletion measured for quasar absorption line systems. In another 2175 Å absorber at z = 1.64 toward the quasar SDSS J160457.50+220300.5, Noterdaeme et al. reported a similar dust depletion measurement ([Fe/Zn] = −1.47 and [Si/Zn] = −1.07) and detected C i and CO absorption lines on its VLT/UVES spectrum. We conclude that heavy dust depletion (i.e., a characteristic of cold dense clouds in MW) is required to produce a pronounced 2175 Å extinction bump." @default.
- W2006221946 created "2016-06-24" @default.
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- W2006221946 date "2010-11-12" @default.
- W2006221946 modified "2023-09-26" @default.
- W2006221946 title "HIGH DUST DEPLETION IN TWO INTERVENING QUASAR ABSORPTION LINE SYSTEMS WITH THE 2175 Å EXTINCTION BUMP AT<i>z</i>∼ 1.4" @default.
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- W2006221946 doi "https://doi.org/10.1088/0004-637x/724/2/1325" @default.
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