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Validation of the DESI 2024 Lyman alpha forest BAL masking strategy

Authors: P. Martini; A. Cuceu; L. Ennesser; A. Brodzeller; J. Aguilar; S. Ahlen; D. Brooks; +40 Authors

Validation of the DESI 2024 Lyman alpha forest BAL masking strategy

Abstract

Abstract Broad absorption line quasars (BALs) exhibit blueshifted absorption relative to a number of their prominent broad emission features. These absorption features can contribute to quasar redshift errors and add absorption to the Lyman-α (Lyα) forest that is unrelated to large-scale structure. We present a detailed analysis of the impact of BALs on the Baryon Acoustic Oscillation (BAO) results with the Lyα forest from the first year of data from the Dark Energy Spectroscopic Instrument (DESI). The baseline strategy for the first year analysis is to mask all pixels associated with all BAL absorption features that fall within the wavelength region used to measure the forest. We explore a range of alternate masking strategies and demonstrate that these changes have minimal impact on the BAO measurements with both DESI data and synthetic data. This includes when we mask the BAL features associated with emission lines outside of the forest region to minimize their contribution to redshift errors. We identify differences in the properties of BALs in the synthetic datasets relative to the observational data, as well as use the synthetic observations to characterize the completeness of the BAL identification algorithm, and demonstrate that incompleteness and differences in the BALs between real and synthetic data also do not impact the BAO results for the Lyα forest.

Countries
Spain, United States, France, Spain
Keywords

5101 Astronomical sciences (for-2020), baryon acoustic oscillations, Baryon acoustic oscillations, Cosmology and Nongalactic Astrophysics (astro-ph.CO), dark energy experiments, 51 Physical Sciences (for-2020), Molecular, Particle and Plasma Physics (for), Nuclear & Particles Physics (science-metrix), FOS: Physical sciences, Lyman alpha forest, 0201 Astronomical and Space Sciences (for), 530, 5101 Astronomical Sciences (for-2020), 0202 Atomic, Dark energy experiments, Nuclear, Àrees temàtiques de la UPC::Física::Astronomia i astrofísica, 5107 Particle and high energy physics (for-2020), [PHYS.ASTR]Physics [physics]/Astrophysics [astro-ph], [PHYS.ASTR] Physics [physics]/Astrophysics [astro-ph], Astrophysics - Cosmology and Nongalactic Astrophysics

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    popularity
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    influence
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selected citations
These citations are derived from selected sources.
This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Citations provided by BIP!
popularity
This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
BIP!Popularity provided by BIP!
influence
This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Influence provided by BIP!
impulse
This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
BIP!Impulse provided by BIP!
4
Top 10%
Average
Average
Green
hybrid