Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Revisiting Metallicity of Long Duration Gamma-Ray Burst Host Galaxies:
  The Role of Chemical Inhomogeneity within Galaxies   We predict the metallicity probability distribution function (PDF) of long
gamma-ray burst (GRB) host galaxies at low-redshifts ($z \la 0.3$) when GRBs
occur only in low-metallicity environment, assuming empirical formulations of
galaxy properties. We discuss contribution of high-metallicity galaxies to the
cosmic rate of low-metallicity GRBs, taking internal dispersion of metallicity
within each galaxy into account. Assuming GRBs trace low-metallicity star
formation $< \Zcrit$: 12+log$_{10}$(O/H) = 8.2, we find that GRB host galaxies
may have systematically higher-metallicity than that of GRB progenitors.
Furthermore, we expect $\ga$ 10% of the host galaxies to have
12+log$_{10}$(O/H) $> 8.8$, if galaxies have internal dispersion of metallicity
comparable to that observed in the Milky Way. Our results show that the
low-metallicity scenario of GRB progenitors can be reconciled with the recent
discoveries of the high-metallicity host galaxies of GRBs. We also show
possible bimodality in the host metallicity PDF that results from the single
progenitor model of GRBs. If found in future observation, the bimodality can be
a clue to constrain the nature of GRB progenitors.

21
The categories of this paper are: adap-org
10
The categories of this paper are: q-bio
28
The categories of this paper are: alg-geom
13
The categories of this paper are: quant-ph
25
The categories of this paper are: patt-sol
24
The categories of this paper are: dg-ga
9
The categories of this paper are: nlin
29
The categories of this paper are: funct-an
4
The categories of this paper are: cond-mat
8
The categories of this paper are: hep-ex
3
The categories of this paper are: physics
7
The categories of this paper are: hep-th
23
The categories of this paper are: solv-int
22
The categories of this paper are: chao-dyn
2
The categories of this paper are: math
5
The categories of this paper are: gr-qc