Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: A Characteristic Mass Scale in the Mass-Metallicity Relation of Galaxies   We study the shape of the gas-phase mass-metallicity relation (MZR) of a
combined sample of present-day dwarf and high-mass star-forming galaxies using
IZI, a Bayesian formalism for measuring chemical abundances presented in Blanc
et al. 2015. We observe a characteristic stellar mass scale at $M_* \simeq
10^{9.5}$M$_{\odot}$, above which the ISM undergoes a sharp increase in its
level of chemical enrichment. In the $10^{6}-10^{9.5}$M$_{\odot}$ range the MZR
follows a shallow power-law ($Z\propto M^{\alpha}_*$) with slope
$\alpha=0.14\pm0.08$. At approaching $M_* \simeq 10^{9.5}$M$_{\odot}$ the MZR
steepens significantly, showing a slope of $\alpha=0.37\pm0.08$ in the
$10^{9.5}-10^{10.5}$M$_{\odot}$ range, and a flattening towards a constant
metallicity at higher stellar masses. This behavior is qualitatively different
from results in the literature that show a single power-law MZR towards the low
mass end. We thoroughly explore systematic uncertainties in our measurement,
and show that the shape of the MZR is not induced by sample selection, aperture
effects, a changing N/O abundance, the adopted methodology used to construct
the MZR, secondary dependencies on star formation activity, nor diffuse ionized
gas (DIG) contamination, but rather on differences in the method used to
measure abundances. High resolution hydrodynamical simulations can
qualitatively reproduce our result, and suggest a transition in the ability of
galaxies to retain their metals for stellar masses above this threshold. The
MZR characteristic mass scale also coincides with a transition in the scale
height and clumpiness of cold gas disks, and a typical gas fraction below which
the efficiency of star formation feedback for driving outflows is expected to
decrease sharply.

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The categories of this paper are: nucl-ex
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The categories of this paper are: solv-int
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The categories of this paper are: q-alg
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The categories of this paper are: alg-geom
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The categories of this paper are: mtrl-th
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The categories of this paper are: supr-con
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The categories of this paper are: dg-ga
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The categories of this paper are: plasm-ph
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The categories of this paper are: hep-ex
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The categories of this paper are: bayes-an
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The categories of this paper are: acc-phys
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The categories of this paper are: cmp-lg
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The categories of this paper are: eess
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The categories of this paper are: comp-gas
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The categories of this paper are: math-ph
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The categories of this paper are: nucl-th