Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Cosmic Star Formation Rate From Gamma-Ray Attenuation   We compute the attenuation of gamma-rays from remote quasars due to
interactions with ambient low-energy photons produced by stars in galaxies and
show that the next-generation gamma ray telescopes can probe the cosmic star
formation rate at high redshifts.

19
The categories of this paper are: eess
4
The categories of this paper are: cond-mat
22
The categories of this paper are: chao-dyn
37
The categories of this paper are: supr-con
5
The categories of this paper are: gr-qc
30
The categories of this paper are: q-alg
10
The categories of this paper are: q-bio
1
The categories of this paper are: cs
34
The categories of this paper are: chem-ph
3
The categories of this paper are: physics
32
The categories of this paper are: atom-ph
7
The categories of this paper are: hep-th
28
The categories of this paper are: alg-geom
20
The categories of this paper are: acc-phys
13
The categories of this paper are: quant-ph
0
The categories of this paper are: hep-ph