Figure 3 from The 2175 Å Extinction Feature in the Optical Afterglow Spectrum of GRB 180325A at z = 2.25

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The 2175 Å Extinction Feature in the Optical Afterglow Spectrum of GRB 180325A at z = 2.25

Authors: T. Zafar, K. E. Heintz, J. P. U. Fynbo, D. Malesani, J. Bolmer, C. Ledoux, M. Arabsalmani, L. Kaper, S. Campana, R. L. C. Starling, J. Selsing, D. A. Kann, A. de Ugarte Postigo, T. Schweyer, L. Christensen, P. Møller, J. Japelj, D. Perley, N. R. Tanvir, P. D'Avanzo, D. H. Hartmann, J. Hjorth, S. Covino, B. Sbarufatti, P. Jakobsson, L. Izzo, R. Salvaterra, V. D'Elia, and D. Xu

2018 The Astrophysical Journal Letters 860 L21.

Provider: AAS Journals

Caption: Figure 3.

Left column: host galaxy Hα and [O III] emission lines. The central redshift of the GRB (z = 2.2486) is marked with vertical brown lines. Middle and right columns: normalized absorption-line profiles on a velocity scale centered at z = 2.2486. The spectra are shown as black curves with corresponding error spectra in blue. Voigt-profile fits are shown in red and top vertical brown lines represent different velocity components.

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