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Effective Opacity of the Intergalactic Medium from Galaxy Spectra Analysis | | Jose S. Monzon
; J. Xavier Prochaska
; Khee-Gan Lee
; John Chisholm
; | | Date: |
19 May 2020 | | Abstract: | We measure the effective opacity ($ au_{eff}$) of the Intergalactic Medium
(IGM) from the composite spectra of 281 Lyman-Break Galaxies (LBGs) in the
redshift range $2 lesssim z lesssim 3$. Our spectra are taken from the COSMOS
Lyman-Alpha Mapping And Tomographic Observations (CLAMATO) survey derived from
the Low Resolution Imaging Spectrometer (LRIS) on the W.M. Keck I telescope. We
generate composite spectra in two redshift intervals and fit them with spectral
energy distribution (SED) models composed of simple stellar populations.
Extrapolating these SED models into the Ly$alpha$ forest, we measure the
effective Ly$alpha$ opacity ($ au_{eff}$) in the $2.02 leq z leq 2.44$
range. At $z = 2.22$, we estimate $ au_{eff} = 0.159 pm 0.001$ from a
power-law fit to the data. These measurements are consistent with estimates
from quasar analyses at $z<2.5$ indicating that the systematic errors
associated with normalizing quasar continua are not substantial. We provide a
Gaussian Processes model of our results and previous $ au_{eff}$ measurements
that describes the steep redshift evolution in $ au_{eff}$ from $z = 1.5 - 4$. | | Source: | arXiv, 2005.9667 | | Services: | Forum | Review | PDF | Favorites | |
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