Roberts-Borsani, GW;
Saintonge, A;
(2019)
The prevalence and properties of cold gas inflows and outflows around galaxies in the local Universe.
Monthly Notices of the Royal Astronomical Society
, 482
(3)
pp. 4111-4145.
10.1093/mnras/sty2824.
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Abstract
We perform a stacking analysis of the neutral Na D λλ5889, 5895 Å ISM doublet using the SDSS DR7 spectroscopic data set to probe the prevalence and characteristics of cold (T ≲ 104 K) galactic-scale gas flows in local (0.025 ≤ z ≤ 0.1) inactive and AGN-host galaxies across the SFR–M* plane. We find low-velocity outflows to be prevalent in regions of high SFRs and stellar masses (10 ≲ log M*/M⊙ ≲ 11.5), however we do not find any detections in the low-mass (log M*/M⊙ ≲ 10) regime. We also find tentative detections of inflowing gas in high-mass galaxies across the star-forming population. We derive mass outflow rates in the range of 0.14–1.74 M⊙ yr−1 and upper limits on inflow rates <1 M⊙ yr−1, allowing us to place constraints on the mass-loading factor (η = M˙out/SFR) for use in simulations of the local Universe. We discuss the fate of the outflows by comparing the force provided by the starburst to the critical force needed to push the outflow outward, and find the vast majority of the outflows unlikely to escape the host system. Finally, as outflow detection rates and central velocities do not vary strongly with the presence of a (weak) active supermassive black hole, we determine that star formation appears to be the primary driver of outflows at z ∼ 0.
| Type: | Article |
|---|---|
| Title: | The prevalence and properties of cold gas inflows and outflows around galaxies in the local Universe |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1093/mnras/sty2824 |
| Publisher version: | https://doi.org/10.1093/mnras/sty2824 |
| Language: | English |
| Additional information: | This version is the version of record. For information on re-use, please refer to the publisher’s terms and conditions. |
| Keywords: | ISM: jets and outflows – galaxies: evolution – galaxies: ISM – galaxies: starburst. |
| UCL classification: | UCL UCL > Provost and Vice Provost Offices > UCL BEAMS UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Physics and Astronomy |
| URI: | https://discovery.ucl.ac.uk/id/eprint/10072606 |
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