Telltale signs of metal recycling in the circumgalactic medium of a z ∼ 0.77 galaxy

N Tejos; S López; C Ledoux; A Fernández-Figueroa; N Rivas; K Sharon; E J Johnston; M K Florian; G D’Ago; A Katsianis; F Barrientos; T Berg; F Corro-Guerra; M Hamel; C Moya-Sierralta; S Poudel; J R Rigby; M Solimano

doi:10.1093/mnras/stab2147

journal article Aug 05, 2021

Telltale signs of metal recycling in the circumgalactic medium of a z ∼ 0.77 galaxy

N Tejos S López C Ledoux A Fernández-Figueroa N Rivas K Sharon E J Johnston

M K Florian G D’Ago A Katsianis

F Barrientos T Berg

F Corro-Guerra M Hamel C Moya-Sierralta S Poudel J R Rigby M Solimano

Monthly Notices of the Royal Astronomical Society Vol. 507 No. 1 pp. 663-679 · Oxford University Press (OUP)

View at Publisher Save 10.1093/mnras/stab2147

Abstract

ABSTRACT
We present gravitational-arc tomography of the cool-warm enriched circumgalactic medium (CGM) of an isolated galaxy (‘G1’) at z ≈ 0.77. Combining VLT/MUSE adaptive-optics and Magellan/MagE echelle spectroscopy, we obtain partially resolved kinematics of Mg ii in absorption and [O ii] in emission. The unique arc configuration allows us to probe 42 spatially independent arc positions transverse to G1, plus four positions in front of it. The transverse positions cover G1’s minor and major axes at impact parameters of ≈10–30 and ≈60 kpc, respectively. We observe a direct kinematic connection between the cool-warm enriched CGM (traced by Mg ii) and the interstellar medium (traced by [O ii]). This provides strong evidence for the existence of an extended disc that co-rotates with the galaxy out to tens of kiloparsecs. The Mg ii velocity dispersion (σ ≈ 30–100 km s−1, depending on position) is of the same order as the modelled galaxy rotational velocity (vrot ≈ 80 km s−1), providing evidence for the presence of a turbulent and pressure-supported CGM component. We regard the absorption to be modulated by a galactic-scale outflow, as it offers a natural scenario for the observed line-of-sight dispersion and asymmetric profiles observed against both the arcs and the galaxy. An extended enriched co-rotating disc together with the signatures of a galactic outflow, are telltale signs of metal recycling in the z ∼ 1 CGM.

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Details

Published: Aug 05, 2021
Vol/Issue: 507(1)
Pages: 663-679
License: View

Authors

N

N Tejos

Instituto de Física, Pontificia Universidad Católica de Valparaíso, Casilla 4059, Valparaíso, Chile

S

S López

Departamento de Astronomía, Universidad de Chile, Casilla 36-D, Santiago, Chile

C

C Ledoux

European Southern Observatory, Alonso de Córdova 3107, Vitacura, Casilla 19001, Santiago, Chile

A

A Fernández-Figueroa

Departamento de Astronomía, Universidad de Chile, Casilla 36-D, Santiago, Chile

N

N Rivas

Instituto de Física, Pontificia Universidad Católica de Valparaíso, Casilla 4059, Valparaíso, Chile

K

K Sharon

Department of Astronomy, University of Michigan, 1085 South University Avenue, Ann Arbor, MI 48109, USA

E

E J Johnston

Instituto de Astrofísica, Pontificia Universidad Católica de Chile, Av. Vicuña Mackenna 4860, 7820436 Macul, Santiago, Chile; Núcleo de Astronomía de la Facultad de Ingeniería y Ciencias, Universidad Diego Portales, Av. Ejército Libertador 441, Santiago, Chile

M

M K Florian

Observational Cosmology Lab, NASA Goddard Space Flight Center, Greenbelt, MD 20771, USA

G

G D’Ago

Instituto de Astrofísica, Pontificia Universidad Católica de Chile, Av. Vicuña Mackenna 4860, 7820436 Macul, Santiago, Chile

A

A Katsianis

Tsung-Dao Lee Institute, Shanghai Jiao Tong University, Shanghai 200240, China

F

F Barrientos

Instituto de Astrofísica, Pontificia Universidad Católica de Chile, Av. Vicuña Mackenna 4860, 7820436 Macul, Santiago, Chile

T

T Berg

European Southern Observatory, Alonso de Córdova 3107, Vitacura, Casilla 19001, Santiago, Chile

F

F Corro-Guerra

Instituto de Física, Pontificia Universidad Católica de Valparaíso, Casilla 4059, Valparaíso, Chile

M

M Hamel

Departamento de Astronomía, Universidad de Chile, Casilla 36-D, Santiago, Chile

C

C Moya-Sierralta

Instituto de Astrofísica, Pontificia Universidad Católica de Chile, Av. Vicuña Mackenna 4860, 7820436 Macul, Santiago, Chile

S

S Poudel

Instituto de Física, Pontificia Universidad Católica de Valparaíso, Casilla 4059, Valparaíso, Chile

J

J R Rigby

Observational Cosmology Lab, NASA Goddard Space Flight Center, Greenbelt, MD 20771, USA

M

M Solimano

Instituto de Astrofísica, Pontificia Universidad Católica de Chile, Av. Vicuña Mackenna 4860, 7820436 Macul, Santiago, Chile; Núcleo de Astronomía de la Facultad de Ingeniería y Ciencias, Universidad Diego Portales, Av. Ejército Libertador 441, Santiago, Chile

Funding

Fondecyt Award: 1191232

Space Telescope Science Institute

European Southern Observatory Award: 0101.A-0364(A)

Cite This Article

N Tejos, S López, C Ledoux, et al. (2021). Telltale signs of metal recycling in the circumgalactic medium of a z ∼ 0.77 galaxy. Monthly Notices of the Royal Astronomical Society, 507(1), 663-679. https://doi.org/10.1093/mnras/stab2147

Telltale signs of metal recycling in the circumgalactic medium of a z ∼ 0.77 galaxy

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