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On the Metallicities and Kinematics of the Circumgalactic Media of Damped Lya Systems at <i>z</i> ∼2.5
Indexado
WoS WOS:001027308700001
Scopus SCOPUS_ID:85165408100
DOI 10.3847/1538-4357/ACD34A
Año 2023
Tipo artículo de investigación

Citas Totales

Autores Afiliación Chile

Instituciones Chile

% Participación
Internacional

Autores
Afiliación Extranjera

Instituciones
Extranjeras


Abstract



We use medium- and high-resolution spectroscopy of close pairs of quasars to analyze the circumgalactic medium (CGM) surrounding 32 damped Lyα absorption systems (DLAs). The primary quasar sightline in each pair probes an intervening DLA in the redshift range 1.6 < z abs < 3.5, such that the secondary sightline probes absorption from Lyα and a large suite of metal-line transitions (including O i, C ii, C iv, Si ii, and Si iv) in the DLA host galaxy’s CGM at transverse distances 24 kpc ≤ R ⊥ ≤ 284 kpc. Analysis of Lyα in the CGM sightlines shows an anticorrelation between R ⊥ and H i column density (N HI) with 99.8% confidence, similar to that observed around luminous galaxies. The incidences of C ii and Si ii with N > 1013 cm−2 within 100 kpc of DLAs are larger by 2σ than those measured in the CGM of Lyman break galaxies (Cf (N CII ) > 0.89 and C f ( N Si II ) = 0.75 − 0.17 + 0.12 ). Metallicity constraints derived from ionic ratios for nine CGM systems with negligible ionization corrections and N HI > 1018.5 cm−2 show a significant degree of scatter (with metallicities/limits across the range − 2.06 ≲ log Z / Z ⊙ ≲ − 0.75 ), suggesting inhomogeneity in the metal distribution in these environments. Velocity widths of C iv λ1548 and low-ionization metal species in the DLA versus CGM sightlines are strongly (>2σ) correlated, suggesting that they trace the potential well of the host halo over R ⊥ ≲ 300 kpc scales. At the same time, velocity centroids for C iv λ1548 differ in DLA versus CGM sightlines by >100 km s−1 for ∼50% of velocity components, but few components have velocities that would exceed the escape velocity assuming dark matter host halos of ≥1012 M ⊙

Revista



Revista ISSN
Astrophysical Journal 0004-637X

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Disciplinas de Investigación



WOS
Astronomy & Astrophysics
Scopus
Sin Disciplinas
SciELO
Sin Disciplinas

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Publicaciones WoS (Ediciones: ISSHP, ISTP, AHCI, SSCI, SCI), Scopus, SciELO Chile.

Colaboración Institucional



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Autores - Afiliación



Ord. Autor Género Institución - País
1 Urbano Stawinski, Stephanie M. Mujer University of California, Irvine - Estados Unidos
1 Stawinski, Stephanie Urbano M. Mujer University of California, Irvine - Estados Unidos
Univ Calif Irvine - Estados Unidos
2 Rubin, Kate H. R. Mujer San Diego State University - Estados Unidos
Center for Astrophysics &amp; Space Sciences - Estados Unidos
Univ Calif San Diego - Estados Unidos
SAN DIEGO STATE UNIV - Estados Unidos
3 Prochaska, J. Xavier - University of California, Santa Cruz - Estados Unidos
Lick Observatory - Estados Unidos
The University of Tokyo - Japón
Kavli Inst Phys & Math Universe WIP - Japón
4 Hennawi, J. Hombre University of California, Santa Barbara - Estados Unidos
Max Planck Institute for Astronomy - Alemania
Max Planck Inst Astron - Alemania
UNIV CALIF SANTA BARBARA - Estados Unidos
5 TEJOS-SALGADO, NICOLAS ANDRES Hombre Pontificia Universidad Católica de Valparaíso - Chile
6 Fumagalli, M. Mujer Università degli Studi di Milano-Bicocca - Italia
Osservatorio Astronomico di Trieste - Italia
Univ Milano Bicocca - Italia
7 Rafelski, Marc Hombre Space Telescope Science Institute - Estados Unidos
Johns Hopkins University - Estados Unidos
Johns Hopkins Univ - Estados Unidos
8 Kirby, Evan N. Hombre California Institute of Technology - Estados Unidos
University of Notre Dame - Estados Unidos
9 Lusso, Elisabeta Mujer Università degli Studi di Firenze - Italia
Osservatorio Astrofisico Di Arcetri - Italia
Istituto Nazionale di Astrofisica - Italia
INAF Osservatorio Astrofisico Arcetri - Italia
10 Hafen, Zachary Hombre University of California, Irvine - Estados Unidos
Univ Calif Irvine - Estados Unidos

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Financiamiento



Fuente
National Science Foundation
NSF
European Research Council
W. M. Keck Foundation
European Research Council (ERC) under the European Union
Fondazione Cariplo
Horizon 2020 Framework Programme
Research Corporation for Science Advancement
Cottrell Scholar award

Muestra la fuente de financiamiento declarada en la publicación.

Agradecimientos



Agradecimiento
The data presented herein were obtained at the W. M. Keck Observatory, which is operated as a scientific partnership among the California Institute of Technology, the University of California and the National Aeronautics and Space Administration. The Observatory was made possible by the generous financial support of the W. M. Keck Foundation.
The data presented herein were obtained at the W. M. Keck Observatory, which is operated as a scientific partnership among the California Institute of Technology, the University of California and the National Aeronautics and Space Administration. The Observatory was made possible by the generous financial support of the W. M. Keck Foundation.
We acknowledge Rob Simcoe for inspiring this work and for many helpful discussions. We also appreciate illuminating conversations with Joe Burchett and Gwen Rudie. This material is based upon work supported by the National Science Foundation under grant No. AST-1847909. KHRR acknowledges partial support from NSF grants AST-1715630 and AST-2009417. E.N.K. gratefully acknowledges support from a Cottrell Scholar award administered by the Research Corporation for Science Advancement. This project has received funding from the European Research Council (ERC) under the European Union's Horizon 2020 research and innovation program (grant agreement No. 757535). This work has also been supported by Fondazione Cariplo, grant No. 2018-2329.The authors wish to recognize and acknowledge the very significant cultural role and reverence that the summit of Maunakea has always had within the indigenous Hawaiian community. We are most fortunate to have the opportunity to conduct observations from this mountain.

Muestra la fuente de financiamiento declarada en la publicación.