English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Plus monthly

Global: Zendy Tools annual

Global: Zendy Tools monthly

Global: Zendy Free Plan

We measure velocity offsets in the NaI $\lambda\lambda5890, 5896$ (Na D)interstellar medium absorption lines to track how neutral galactic winds changeas their host galaxies evolve. Our sample of $\sim$80,000 SDSS spectra at$0.010 < z < 0.325$ includes starburst, post-starburst, and quiescent galaxies,forming an evolutionary sequence of declining star formation rate (SFR). Wedetect bulk flows across this sequence, mostly at higher host stellarmasses($log(M_{\star}/M_{\odot})>10$). Along this sequence, the fraction ofoutflows decreases ($76\pm2\%$ to $65\pm4\%$ to a 3$\sigma$ upper limit of$34\%$), and the mean velocity offset changes from outflowing to inflowing($-84.6\pm5.9$ to $-71.6\pm11.4$ to $76.6\pm2.3\,km\,s^{-1}$). Even within thepost-starburst sample, wind speed decreases with time elapsed since thestarburst ended. These results reveal that outflows diminish as galaxies age.For post-starbursts, there is evidence for an AGN contribution, especially tothe speediest outflows: 1) SFR declines faster in time than outflow velocity, adecoupling arguing against massive stellar feedback; 2) of the few outflowsstrong enough to escape the interstellar medium (9/105), three of the fourhosts with measured emission lines are Seyfert galaxies. For disky starburstgalaxies, however, the trends suggest flows out of the stellar disk plane (withoutflow 1/2-opening angle $> 45$ degree) instead of from the nucleus: the windvelocity decreases as the disk becomes more edge-on, and the outflow fraction,constant at $\sim$90$\%$ for disk inclinations $i<45$ degree, steadilydecreases from $\sim$90$%$ to 20$\%$ for $i>45$ degree.

Evolution of Gas Flows along the Starburst to Post-Starburst to Quiescent Galaxy Sequence