Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Characterizing the local relation between star formation rate and
  gas-phase metallicity in MaNGA spiral galaxies   The role of gas accretion in galaxy evolution is still a matter of debate.
The presence of inflows of metal-poor gas that trigger star formation bursts of
low metallicity has been proposed as an explanation for the local
anti-correlation between star formation rate (SFR) and gas-phase metallicity
($\rm Z_g$) found in the literature. In the present study, we show how the
anti-correlation is also present as part of a diversified range of behaviours
for a sample of more than 700 nearby spiral galaxies from the SDSS IV MaNGA
survey. We have characterized the local relation between SFR and $\rm Z_g$
after subtracting the azimuthally averaged radial profiles of both quantities.
$60\%$ of the analyzed galaxies display a $\rm SFR-Z_g$ anti-correlation, with
the remaining $40\%$ showing no correlation ($19\%$) or positive correlation
($21\%$). Applying a Random Forest machine-learning algorithm, we obtain that
the slope of the correlation is mainly determined by the average gas-phase
metallicity of the galaxy. Galaxy mass, $g-r$ colors, stellar age, and mass
density seem to play a less significant role. This result is supported by the
performed 2nd-order polynomial regression analysis. Thus, the local $\rm
SFR-Z_g$ slope varies with the average metallicity, with the more metal-poor
galaxies presenting the lowest slopes (i.e., the strongest $\rm SFR-Z_g$
anti-correlations), and reversing the relation for more metal-rich systems. Our
results suggest that external gas accretion fuels star-formation in metal-poor
galaxies, whereas in metal-rich systems the gas comes from previous star
formation episodes.

21
The categories of this paper are: adap-org
11
The categories of this paper are: hep-lat
37
The categories of this paper are: supr-con
22
The categories of this paper are: chao-dyn
36
The categories of this paper are: cmp-lg
19
The categories of this paper are: eess
24
The categories of this paper are: dg-ga
1
The categories of this paper are: cs
28
The categories of this paper are: alg-geom
35
The categories of this paper are: mtrl-th
13
The categories of this paper are: quant-ph
23
The categories of this paper are: solv-int
0
The categories of this paper are: hep-ph
17
The categories of this paper are: q-fin
33
The categories of this paper are: plasm-ph
8
The categories of this paper are: hep-ex