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• W2895822633 endingPage "59" @default.
• W2895822633 startingPage "39" @default.
• W2895822633 abstract "Lyman α (Lyα) photons from ionizing sources and cooling radiation undergo a complex resonant scattering process that generates unique spectral signatures in high-redshift galaxies. We present a detailed Lyα radiative transfer study of a cosmological zoom-in simulation from the Feedback In Realistic Environments (FIRE) project. We focus on the time, spatial, and angular properties of the Lyα emission over a redshift range of |$z$| = 5–7, after escaping the galaxy and being transmitted through the intergalactic medium (IGM). Over this epoch, our target galaxy has an average stellar mass of |$M_star approx 5 times 10^8, text{M}_{odot }$|⁠. We find that many of the interesting features of the Lyα line can be understood in terms of the galaxy’s star formation history. The time variability, spatial morphology, and anisotropy of Lyα properties are consistent with current observations. For example, the rest-frame equivalent width has an |$text{EW}_{text{Ly}alpha ,0} gt 20, {mathring{rm A} }$| duty cycle of |$62{{ rm per cent}}$| with a non-negligible number of sightlines with |$gt 100, {mathring{rm A} }$|⁠, associated with outflowing regions of a starburst with greater coincident UV continuum absorption, as these conditions generate redder, narrower (or single-peaked) line profiles. The lowest equivalent widths correspond to cosmological filaments, which have little impact on UV continuum photons but efficiently trap Lyα and produce bluer, broader lines with less transmission through the IGM. We also show that in dense self-shielding, low-metallicity filaments and satellites, Lyα radiation pressure can be dynamically important. Finally, despite a significant reduction in surface brightness with increasing redshift, Lyα detections and spectroscopy of high-|$z$| galaxies with the upcoming James Webb Space Telescope is feasible." @default.
• W2895822633 created "2018-10-26" @default.
• W2895822633 creator A5028360288 @default.
• W2895822633 creator A5038938655 @default.
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• W2895822633 creator A5083397483 @default.
• W2895822633 creator A5084467446 @default.
• W2895822633 creator A5086780511 @default.
• W2895822633 date "2018-12-22" @default.
• W2895822633 modified "2023-10-18" @default.
• W2895822633 title "The physics of Lyman α escape from high-redshift galaxies" @default.
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