Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: A Theoretical Investigation on the Gamma-ray Burst Host Galaxies   Long-duration gamma-ray bursts(LGRBs) are believed to be linked with the star
formation. We adopt a galactic evolution model, in which the star formation
process inside the virialized dark halo at given redshift can be achieved. In
this paper, the gamma-ray burst(GRB) host galaxies are assumed to be the
star-forming galaxies within the small dark halos. The star formation
rates(SFRs) in the host galaxies of LGRBs at different redshifts have been
derived from our model with the galactic evolutionary time about a few times of
$10^7$ yr and the dark halo mass of about $5\times 10^{11}M_\odot$. The related
stellar masses, luminosities and metallicities of these hosts are estimated as
well. We further calculate the X-ray and optical absorption of GRB afterglow
emission. From our model calculation, at higher redshift, the SFR of host
galaxy is larger, the absorption in X-ray band and optical band of GRB
afterglow is stronger, in the condition that the dust and metal components are
released locally, surrounding the GRB environment. These model predictions are
compared with the {\it Swift} and other observational data. At lower redshift
$z<1$, as the merger and interaction of some host galaxies are involved, one
monolithic physical process is not sufficient to fully explain all kinds of
observed phenomena.

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The categories of this paper are: plasm-ph
7
The categories of this paper are: hep-th
15
The categories of this paper are: nucl-ex
20
The categories of this paper are: acc-phys
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The categories of this paper are: chao-dyn
28
The categories of this paper are: alg-geom
2
The categories of this paper are: math
4
The categories of this paper are: cond-mat
13
The categories of this paper are: quant-ph
14
The categories of this paper are: math-ph
12
The categories of this paper are: nucl-th
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The categories of this paper are: eess
21
The categories of this paper are: adap-org
3
The categories of this paper are: physics
27
The categories of this paper are: comp-gas
24
The categories of this paper are: dg-ga