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Article Dans Une Revue Monthly Notices of the Royal Astronomical Society Année : 2022

Orientation effects on cool gas absorption from gravitational-arc tomography of a z = 0.77 disc galaxy

N Tejos
T Berg
A Afruni
  • Fonction : Auteur
L Barrientos
  • Fonction : Auteur
J Gonzalez-Lopez
  • Fonction : Auteur
M Hamel
  • Fonction : Auteur
E Johnston
A Katsianis
  • Fonction : Auteur
K Sharon
M Solimano
  • Fonction : Auteur

Résumé

ABSTRACT We use spatially resolved spectroscopy of a distant giant gravitational arc to test orientation effects on Mg ii absorption equivalent width (EW) and covering fraction (〈κ〉) in the circumgalactic medium of a foreground star-forming galaxy (G1) at z ∼ 0.77. Forty-two spatially-binned arc positions uniformly sample impact parameters (D) to G1 between 10 and 30 kpc and azimuthal angles α between 30° and 90° (minor axis). We find an EW-D anticorrelation, akin to that observed statistically in quasar absorber studies, and an apparent correlation of both EW and 〈κ〉 with α, revealing a non-isotropic gas distribution. In line with our previous results on Mg ii kinematics suggesting the presence of outflows in G1, at minimum a simple 3D static double-cone model (to represent the trace of bipolar outflows) is required to recreate the EW spatial distribution. The D and α values probed by the arc cannot confirm the presence of a disc, but the data highly disfavour a disc alone. Our results support the interpretation that the EW-α correlation observed statistically using other extant probes is partly shaped by bipolar metal-rich winds.
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Dates et versions

hal-03837493 , version 1 (12-04-2023)

Identifiants

Citer

A Fernandez-Figueroa, S Lopez, N Tejos, T Berg, C Ledoux, et al.. Orientation effects on cool gas absorption from gravitational-arc tomography of a z = 0.77 disc galaxy. Monthly Notices of the Royal Astronomical Society, 2022, 517 (2), pp.2214-2220. ⟨10.1093/mnras/stac2851⟩. ⟨hal-03837493⟩
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