Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Supernovae and extragalactic astronomy with laser guide star adaptive
  optics   Using the latest generation of adaptive optics imaging systems together with
laser guide stars on 8m-class telescopes, we are finally revealing the
previously-hidden population of supernovae in starburst galaxies. Finding these
supernovae and measuring the amount of absorption due to dust is crucial to
being able to accurately trace the star formation history of our Universe. Our
images of the host galaxies are amongst the sharpest ever obtained from the
ground, and reveal much about how and why these galaxies are forming massive
stars (that become supernovae) at such a prodigious rate.

10
The categories of this paper are: q-bio
25
The categories of this paper are: patt-sol
27
The categories of this paper are: comp-gas
16
The categories of this paper are: stat
13
The categories of this paper are: quant-ph
1
The categories of this paper are: cs
28
The categories of this paper are: alg-geom
29
The categories of this paper are: funct-an
11
The categories of this paper are: hep-lat
35
The categories of this paper are: mtrl-th
5
The categories of this paper are: gr-qc
8
The categories of this paper are: hep-ex
20
The categories of this paper are: acc-phys
3
The categories of this paper are: physics
21
The categories of this paper are: adap-org
33
The categories of this paper are: plasm-ph