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The Lyman α forest power spectrum from the XQ-100 Legacy Survey
- Publication Year :
- 2017
-
Abstract
- We present the Lyman-$��$ flux power spectrum measurements of the XQ-100 sample of quasar spectra obtained in the context of the European Southern Observatory Large Programme "Quasars and their absorption lines: a legacy survey of the high redshift universe with VLT/XSHOOTER". Using $100$ quasar spectra with medium resolution and signal-to-noise ratio we measure the power spectrum over a range of redshifts $z = 3 - 4.2$ and over a range of scales $k = 0.003 - 0.06\,\mathrm{s\,km^{-1}}$. The results agree well with the measurements of the one-dimensional power spectrum found in the literature. The data analysis used in this paper is based on the Fourier transform and has been tested on synthetic data. Systematic and statistical uncertainties of our measurements are estimated, with a total error (statistical and systematic) comparable to the one of the BOSS data in the overlapping range of scales, and smaller by more than $50\%$ for higher redshift bins ($z>3.6$) and small scales ($k > 0.01\,\mathrm{s\,km^{-1}}$). The XQ-100 data set has the unique feature of having signal-to-noise ratios and resolution intermediate between the two data sets that are typically used to perform cosmological studies, i.e. BOSS and high-resolution spectra (e.g. UVES/VLT or HIRES). More importantly, the measured flux power spectra span the high redshift regime which is usually more constraining for structure formation models.<br />17 pages, 12 figures. Accepted in MNRAS
- Subjects :
- Cosmology and Nongalactic Astrophysics (astro-ph.CO)
media_common.quotation_subject
methods: data analysis
intergalactic medium
cosmology: observations
large-scale structure of Universe
Flux
FOS: Physical sciences
Context (language use)
Astrophysics
Astrophysics::Cosmology and Extragalactic Astrophysics
01 natural sciences
7. Clean energy
Spectral line
Settore FIS/05 - Astronomia e Astrofisica
Observatory
0103 physical sciences
010303 astronomy & astrophysics
media_common
Physics
010308 nuclear & particles physics
Spectral density
Astronomy
Astronomy and Astrophysics
Quasar
Redshift
Universe
Space and Planetary Science
Astrophysics - Cosmology and Nongalactic Astrophysics
Subjects
Details
- Language :
- English
- Database :
- OpenAIRE
- Accession number :
- edsair.doi.dedup.....ff66bade6b5ed5df90cb3aa42d56e1bf