Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: The metallicity properties of long-GRB hosts   The recently-discovered Fundamental Metallicity Relation (FMR), which is the
tight dependence of metallicity on both mass and SFR, proves to be a very
useful tool to study the metallicity properties of various classes of galaxies.
We have used the FMR to study the galaxies hosting long-GRBs. While the GRB
hosts have lower metallicities than typical galaxies of the same mass, i.e.,
they are below the mass-metallicity relation, they are fully consistent with
the FMR. This shows that the difference with the mass-metallicity relation is
due to higher than average SFRs, and that GRBs with optical afterglows do not
preferentially select low-metallicity hosts among the star-forming galaxies.

19
The categories of this paper are: eess
15
The categories of this paper are: nucl-ex
25
The categories of this paper are: patt-sol
13
The categories of this paper are: quant-ph
22
The categories of this paper are: chao-dyn
36
The categories of this paper are: cmp-lg
8
The categories of this paper are: hep-ex
21
The categories of this paper are: adap-org
26
The categories of this paper are: bayes-an
4
The categories of this paper are: cond-mat
9
The categories of this paper are: nlin
35
The categories of this paper are: mtrl-th
7
The categories of this paper are: hep-th
12
The categories of this paper are: nucl-th
28
The categories of this paper are: alg-geom
27
The categories of this paper are: comp-gas