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Gas inflow and metallicity drops in star-forming galaxies

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arxiv 1509.02051 v2 pith:OM5AE47U submitted 2015-09-07 astro-ph.GA

Gas inflow and metallicity drops in star-forming galaxies

Daniel Ceverino , Jorge Sanchez-Almeida , Casiana Mu\~noz-Tu\~non , Avishai Dekel , Bruce G. Elmegreen , Debra M. Elmegreen , Joel Primack This is my paper
classification astro-ph.GA
keywords metallicitygalaxiesinflowredshiftsstar-formingclumpscosmologicaldrops
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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.

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