• DOI:10.1093/mnras/stac2851
• Corpus ID: 252568328

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

@inproceedings{FernndezFigueroa2022OrientationEO,
  title={Orientation effects on cool gas absorption from gravitational-arc tomography of a z = 0.77 disc galaxy},
  author={A. Fern{\'a}ndez-Figueroa and Silvia Goy Lopez and Nicolas Tejos and T. A. M. Berg and C{\'e}dric Ledoux and Pasquier Noterdaeme and Andrea Afruni and L. Felipe Barrientos and Jorge Gonz{\'a}lez-L{\'o}pez and Mark Hamel and Evelyn J. Johnston and Antonios Katsianis and Keren Sharon and M. Solimano U. de Chile and Pucv and Eső and FCLA-CNRS and Universidad Catolica de Chile and iap and Puc and Carnegie and Udp and Shanghai Jiao Tong University and University of Michigan},
  year={2022}
}

• A. Fernández-Figueroa, S. Lopez, +21 authors U. Michigan
• Published 28 September 2022
• Physics

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 ( h κ i ) 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 anti-correlation, akin to that observed statistically in quasar absorber studies, and an apparent correlation of both EW and h κ i 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 3-D 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 disfavor 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.