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@article{Napolitano:2023:1538-3881/ace62c,
author = {Napolitano, L and Pandey, A and Myers, AD and Lan, TW and Anand, A and Aguilar, J and Ahlen, S and Alexander, DM and Brooks, D and Canning, R and Circosta, C and De, La Macorra A and Doel, P and Eftekharzadeh, S and Fawcett, VA and Font-Ribera, A and Garcia-Bellido, J and Gontcho, A Gontcho S and Le, Guillou L and Guy, J and Honscheid, K and Juneau, S and Kisner, T and Landriau, M and Meisner, AM and Miquel, R and Moustakas, J and Percival, WJ and Prochaska, JX and Schubnell, M and Tarlé, G and Weaver, BA and Weiner, B and Zhou, Z and Zou, H and Zou, S},
doi = {1538-3881/ace62c},
journal = {Astronomical Journal},
title = {Detecting and Characterizing Mg ii Absorption in DESI Survey Validation Quasar Spectra},
url = {http://dx.doi.org/10.3847/1538-3881/ace62c},
volume = {166},
year = {2023}
}

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TY  - JOUR
AB  - We present findings of the detection of Magnesium II (Mg ii, λ = 2796, 2803 Å) absorbers from the early data release of the Dark Energy Spectroscopic Instrument (DESI). DESI is projected to obtain spectroscopy of approximately 3 million quasars (QSOs), of which over 99% are anticipated to be at redshifts greater than z > 0.3, such that DESI would be able to observe an associated or intervening Mg ii absorber illuminated by the background QSO. We have developed an autonomous supplementary spectral pipeline that detects these systems through an initial line-fitting process and then confirms the line properties using a Markov Chain Monte Carlo sampler. Based upon a visual inspection of the resulting systems, we estimate that this sample has a purity greater than 99%. We have also investigated the completeness of our sample in regard to both the signal-to-noise properties of the input spectra and the rest-frame equivalent width (W 0) of the absorber systems. From a parent catalog containing 83,207 quasars, we detect a total of 23,921 Mg ii absorption systems following a series of quality cuts. Extrapolating from this occurrence rate of 28.8% implies a catalog at the completion of the five-year DESI survey that will contain over eight hundred thousand Mg ii absorbers. The cataloging of these systems will enable significant further research because they carry information regarding circumgalactic medium environments, the distribution of intervening galaxies, and the growth of metallicity across the redshift range 0.3 ≤ z < 2.5.
AU  - Napolitano,L
AU  - Pandey,A
AU  - Myers,AD
AU  - Lan,TW
AU  - Anand,A
AU  - Aguilar,J
AU  - Ahlen,S
AU  - Alexander,DM
AU  - Brooks,D
AU  - Canning,R
AU  - Circosta,C
AU  - De,La Macorra A
AU  - Doel,P
AU  - Eftekharzadeh,S
AU  - Fawcett,VA
AU  - Font-Ribera,A
AU  - Garcia-Bellido,J
AU  - Gontcho,A Gontcho S
AU  - Le,Guillou L
AU  - Guy,J
AU  - Honscheid,K
AU  - Juneau,S
AU  - Kisner,T
AU  - Landriau,M
AU  - Meisner,AM
AU  - Miquel,R
AU  - Moustakas,J
AU  - Percival,WJ
AU  - Prochaska,JX
AU  - Schubnell,M
AU  - Tarlé,G
AU  - Weaver,BA
AU  - Weiner,B
AU  - Zhou,Z
AU  - Zou,H
AU  - Zou,S
DO  - 1538-3881/ace62c
PY  - 2023///
SN  - 0004-6256
TI  - Detecting and Characterizing Mg ii Absorption in DESI Survey Validation Quasar Spectra
T2  - Astronomical Journal
UR  - http://dx.doi.org/10.3847/1538-3881/ace62c
VL  - 166
ER  -

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