Orientation effects on cool gas absorption from gravitational-arc tomography of a z = 0.77 disc galaxy
| العنوان: | Orientation effects on cool gas absorption from gravitational-arc tomography of a z = 0.77 disc galaxy |
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| المؤلفون: | A Fernandez-Figueroa, S Lopez, N Tejos, T A M Berg, C Ledoux, P Noterdaeme, A Afruni, L F Barrientos, J Gonzalez-Lopez, M Hamel, E J Johnston, A Katsianis, K Sharon, M Solimano |
| سنة النشر: | 2022 |
| مصطلحات موضوعية: | Space and Planetary Science, Astrophysics of Galaxies (astro-ph.GA), FOS: Physical sciences, Astronomy and Astrophysics, Astrophysics - Astrophysics of Galaxies |
| الوصف: | We use spatially-resolved spectroscopy of a distant giant gravitational arc to test orientation effects on MgII absorption equivalent width (EW) and covering fraction (kappa) 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 alpha between 30 and 90 degrees (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 kappa with alpha, revealing a non-isotropic gas distribution. In line with our previous results on MgII 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 alpha 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-alpha correlation observed statistically using other extant probes is partly shaped by bipolar metal-rich winds. Accepted in Monthly Notices of the Royal Astronomical Society |
| اللغة: | English |
| URL الوصول: | https://explore.openaire.eu/search/publication?articleId=doi_dedup___::5f5b86fe258741d619c73f44518ea989 http://arxiv.org/abs/2209.14134 |
| حقوق: | OPEN |
| رقم الأكسشن: | edsair.doi.dedup.....5f5b86fe258741d619c73f44518ea989 |
| قاعدة البيانات: | OpenAIRE |
| الوصف غير متاح. |