MUSEQuBES: characterizing the circumgalactic medium of redshift ≍3.3 Lyα emitters

Autor: Lutz Wisotzki, Raffaella Anna Marino, Sean D. Johnson, Sowgat Muzahid, Johannes Zabl, Nicolas Bouché, Martin Wendt, Michael V. Maseda, Joop Schaye, Sebastiano Cantalupo
Přispěvatelé: Leiden Observatory [Leiden], Universiteit Leiden [Leiden], Leibniz Institute for Astrophysics Potsdam (AIP), Centre de Recherche Astrophysique de Lyon (CRAL), École normale supérieure - Lyon (ENS Lyon)-Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences de l'Univers (INSU - CNRS), Muzahid, S, Schaye, J, Cantalupo, S, Marino, R, Bouche, N, Johnson, S, Maseda, M, Wendt, M, Wisotzki, L, Zabl, J, Universiteit Leiden, École normale supérieure de Lyon (ENS de Lyon)-Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS), ANR-17-CE31-0017,3DGASFLOWS,Comprendre le rôle des écoulements de gaz autour des galaxies grâce à une confrontation entre observations 3D et simulations numériques(2017)
Jazyk: angličtina
Rok vydání: 2021
Předmět:
Zdroj: Monthly Notices of the Royal Astronomical Society
Monthly Notices of the Royal Astronomical Society, Oxford University Press (OUP): Policy P-Oxford Open Option A, 2021, 508 (4), pp.5612-5637. ⟨10.1093/mnras/stab2933⟩
Monthly Notices of the Royal Astronomical Society, 508(4), 5612-5637
Monthly Notices of the Royal Astronomical Society, 508 (4)
Monthly Notices of the Royal Astronomical Society, 2021, 508 (4), pp.5612-5637. ⟨10.1093/mnras/stab2933⟩
ISSN: 0035-8711
1365-2966
DOI: 10.1093/mnras/stab2933
Popis: We present the first characterization of the circumgalactic medium of Ly α emitters (LAEs), using a sample of 96 z ≈ 3.3 LAEs detected with the VLT/MUSE in fields centred on eight bright background quasars. The LAEs have low Ly α luminosities ($\sim 10^{42}\, \text{erg}\, \text{s}^{-1}$) and star formation rates (SFRs) $\sim 1~\text{M}_\odot \, \text{yr}^{-1}$, which for main-sequence galaxies correspond to stellar masses of only $\sim 10^{8.6}\, \text{M}_\odot$. The median transverse distance between the LAEs and the quasar sightlines is 165 proper kpc (pkpc). We stacked the high-resolution quasar spectra and measured significant excess H i and C iv absorption near the LAEs out to 500 $\text{km}\, \text{s}^{-1}$ and at least ≈250 pkpc (corresponding to ≈7 virial radii). At $\lesssim 30~\text{km}\, \text{s}^{-1}$ from the galaxies, the median H i and C iv optical depths are enhanced by an order of magnitude. The absorption is significantly stronger around the ≈1/3 of our LAEs that are part of ‘groups’, which we attribute to the large-scale structures in which they are embedded. We do not detect any strong dependence of either the H i or C iv absorption on transverse distance (over the range ≈50–250 pkpc), redshift, or the properties of the Ly α emission line (luminosity, full width at half-maximum, or equivalent width). However, for H i, but not C iv, the absorption at $\lesssim 100\, \text{km}\, \text{s}^{-1}$ from the LAE does increase with the SFR. This suggests that LAEs surrounded by more H i tend to have higher SFRs.
Databáze: OpenAIRE
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