text: 180,25,1021311817589682176,739505640326987777,Guido Roberts-Borsani,"New paper out today! <LINK> Very pleased with this one: looking at cold gas inflows and outflows in local, normal galaxies using stacking techniques of SDSS spectra - aiming to constrain the strength/properties of the flows and whether they can quench the galaxy! <LINK> In the local Universe, two populations of galaxies are observed: blue+star-forming and red+passive galaxies that have stopped forming stars. The general consensus is that galaxies transit from this blue population to the red one - ie., something is quenching the star formation. <LINK> One of the major unanswered questions in astronomy is how does this happen? Here we look at the role of galaxy outflows and aim to constrain whether they can expel enough Hydrogen gas out of the galaxy - thereby removing the ""fuel"" for star formation - to ""quench"" the host. <LINK> Many authors have done great work on this, but generally looked at extreme objects with somewhat incomplete data sets. Here we expand on this by looking at all galaxy populations with one of the largest astronomical surveys to date (@sdssurveys).",https://arxiv.org/abs/1807.07575,"We perform a stacking analysis of the neutral \nad\,$\lambda\lambda$5889,5895\,\AA\ ISM doublet using the SDSS DR7 spectroscopic data set to probe the prevalence and characteristics of cold (T\,$\lesssim$\,10$^{4}$\,K) galactic-scale gas flows in local (0.025$\leqslant z\leqslant$0.1) inactive and AGN-host galaxies across the SFR-M$_{*}$ plane. We find low-velocity outflows to be prevalent in regions of high SFRs and stellar masses (10 $\lesssim$log M$_{*}$/M$_{\odot}$ $\lesssim$ 11.5), however we do not find any detections in the low mass (log M$_{*}$/M$_{\odot}$ $\lesssim$ 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$_{\odot}$yr$^{-1}$ and upper limits on inflow rates <1\,M$_{\odot}$yr$^{-1}$, allowing us to place constraints on the mass loading factor ($\eta$=$\dot{M}_{\text{out}}$/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\sim$0. ","The prevalence and properties of cold gas inflows and outflows around