MusE GAs FLOw and Wind V. The dust/metallicity-anisotropy of the circum-galactic medium
- We investigate whether the dust content of the circum-galactic medium (CGM) depends on the location of the quasar sightline with respect to the galaxy major-axis using 13 galaxy-Mg II absorber pairs (9-81 kpc distance) from the MusE GAs FLOw and Wind (MEGAFLOW) survey at 0.4 < z < 1.4. The dust content of the CGM is obtained from [Zn/Fe] using ultraviolet and visual echelle spectrograph data. When a direct measurement of [Zn/Fe] is unavailable, we estimate the dust depletion from a method that consists in solving for the depletion from multiple singly ionized ions (e.g. Mn II, Cr II, and Zn II) since each ion depletes on dust grains at different rates. We find a positive correlation between the azimuthal angle and [Zn/Fe] with a Pearson's gamma = 0.70 +/- 0.14. The sightlines along the major axis show [Zn/Fe] < 0.5, whereas the [Zn/Fe] is > 0.8 along the minor axis. These results suggest that the CGM along the minor axis is on average more metal enriched (by approximate to 1 dex) than the gas located along the major axis of galaxiesWe investigate whether the dust content of the circum-galactic medium (CGM) depends on the location of the quasar sightline with respect to the galaxy major-axis using 13 galaxy-Mg II absorber pairs (9-81 kpc distance) from the MusE GAs FLOw and Wind (MEGAFLOW) survey at 0.4 < z < 1.4. The dust content of the CGM is obtained from [Zn/Fe] using ultraviolet and visual echelle spectrograph data. When a direct measurement of [Zn/Fe] is unavailable, we estimate the dust depletion from a method that consists in solving for the depletion from multiple singly ionized ions (e.g. Mn II, Cr II, and Zn II) since each ion depletes on dust grains at different rates. We find a positive correlation between the azimuthal angle and [Zn/Fe] with a Pearson's gamma = 0.70 +/- 0.14. The sightlines along the major axis show [Zn/Fe] < 0.5, whereas the [Zn/Fe] is > 0.8 along the minor axis. These results suggest that the CGM along the minor axis is on average more metal enriched (by approximate to 1 dex) than the gas located along the major axis of galaxies provided that dust depletion is a proxy for metallicity. This anisotropic distribution is consistent with recent results on outflow and accretion in hydro-dynamical simulations.…
| Author details: | Martin WendtORCiDGND, Nicolas F. BoucheORCiD, Johannes ZablORCiD, Ilane Schroetter, Sowgat MuzahidORCiD |
|---|---|
| DOI: | https://doi.org/10.1093/mnras/stab049 |
| ISSN: | 0035-8711 |
| ISSN: | 1365-2966 |
| Title of parent work (English): | Monthly notices of the Royal Astronomical Society |
| Publisher: | Oxford Univ. Press |
| Place of publishing: | Oxford |
| Publication type: | Article |
| Language: | English |
| Date of first publication: | 2021/01/11 |
| Publication year: | 2021 |
| Release date: | 2024/02/22 |
| Tag: | absorption lines; galaxies: evolution; galaxies: formation; intergalactic medium; quasars: |
| Volume: | 502 |
| Issue: | 3 |
| Number of pages: | 13 |
| First page: | 3733 |
| Last Page: | 3745 |
| Funding institution: | ANR 3DGasFlowsFrench National Research Agency (ANR) [ANR-17-CE31-0017]; OCEVU Labex [ANR-11-LABX-0060]; Humboldt Foundation, GermanyAlexander von Humboldt Foundation; European Organisation for Astronomical Research in the Southern Hemisphere under ESO programme(s) [094.A-0211, 095.A-0365, 096.A-0164, 096.A-0609, 097.A-0138, 097.A-0144, 098.A-0216, 098.A-0310, 099.A-0059, 293.A-5038, 0100.A-0089, 0101.A-0287] |
| Organizational units: | Mathematisch-Naturwissenschaftliche Fakultät / Institut für Physik und Astronomie |
| DDC classification: | 5 Naturwissenschaften und Mathematik / 53 Physik / 530 Physik |
| Peer review: | Referiert |
| License (German): |  Keine öffentliche Lizenz: Unter Urheberrechtsschutz |
