%0 Generic %1 ceverino2015inflow %A Ceverino, Daniel %A Sanchez-Almeida, Jorge %A Muñoz-Tuñon, Casiana %A Dekel, Avishai %A Elmegreen, Bruce G. %A Elmegreen, Debra M. %A Primack, Joel %D 2015 %K gas inflow metallcity %T Gas Inflow and Metallicity Drops in Star-forming Galaxies %U http://arxiv.org/abs/1509.02051 %X Gas inflow feeds galaxies with low metallicity gas from the cosmic web, sustaining star formation across the Hubble time. We make a connection between these inflows and metallicity inhomogeneities in star-forming galaxies, by using synthetic narrow-band images of the Halpha emission line from zoom-in AMR cosmological simulations of galaxies with stellar masses of $M 10^9 $Msun at redshifts z=2-7. In $\sim$50\% of the cases at redshifts lower than 4, the gas inflow gives rise to star-forming, Halpha-bright, off-centre clumps. Most of these clumps have gas metallicities, weighted by Halpha luminosity, lower than the metallicity in the surrounding interstellar medium by $\sim$0.3 dex, consistent with observations of chemical inhomogeneities at high and low redshifts. Due to metal mixing by shear and turbulence, these metallicity drops are dissolved in a few disc dynamical times. Therefore, they can be considered as evidence for rapid gas accretion coming from cosmological inflow of pristine gas.

@misc{ceverino2015inflow, abstract = {Gas inflow feeds galaxies with low metallicity gas from the cosmic web, sustaining star formation across the Hubble time. We make a connection between these inflows and metallicity inhomogeneities in star-forming galaxies, by using synthetic narrow-band images of the Halpha emission line from zoom-in AMR cosmological simulations of galaxies with stellar masses of $M \simeq 10^9 $Msun at redshifts z=2-7. In $\sim$50\% of the cases at redshifts lower than 4, the gas inflow gives rise to star-forming, Halpha-bright, off-centre clumps. Most of these clumps have gas metallicities, weighted by Halpha luminosity, lower than the metallicity in the surrounding interstellar medium by $\sim$0.3 dex, consistent with observations of chemical inhomogeneities at high and low redshifts. Due to metal mixing by shear and turbulence, these metallicity drops are dissolved in a few disc dynamical times. Therefore, they can be considered as evidence for rapid gas accretion coming from cosmological inflow of pristine gas.}, added-at = {2015-09-08T09:48:56.000+0200}, author = {Ceverino, Daniel and Sanchez-Almeida, Jorge and Muñoz-Tuñon, Casiana and Dekel, Avishai and Elmegreen, Bruce G. and Elmegreen, Debra M. and Primack, Joel}, biburl = {https://www.bibsonomy.org/bibtex/204d89cffeba56a91d8e9ba7f512db701/miki}, description = {[1509.02051] Gas Inflow and Metallicity Drops in Star-forming Galaxies}, interhash = {a385a6be21b3888c7f62bcec289967dc}, intrahash = {04d89cffeba56a91d8e9ba7f512db701}, keywords = {gas inflow metallcity}, note = {cite arxiv:1509.02051Comment: 8 pages, 6 figures. Submitted to MNRAS}, timestamp = {2015-09-08T09:48:56.000+0200}, title = {Gas Inflow and Metallicity Drops in Star-forming Galaxies}, url = {http://arxiv.org/abs/1509.02051}, year = 2015 }