Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: OH in Messier 82   Several new main line OH masers have been detected in the nearby starburst
galaxy M82. Eight masers have been detected to 5 sigma, six of which are new
detections. Observations covering both the 1665 and 1667 MHz lines with both
the Very Large Array (VLA) and the Multi-Element Radio Linked Interferometer
Network (MERLIN) have been used to accurately measure the positions and
velocities of these features. Following analysis of the data, another six
objects below 5 sigma, but with velocities consistent with the distribution
inferred from the more certain detections, have been detected. These are
classified as possible detections.

20
The categories of this paper are: acc-phys
28
The categories of this paper are: alg-geom
10
The categories of this paper are: q-bio
36
The categories of this paper are: cmp-lg
4
The categories of this paper are: cond-mat
0
The categories of this paper are: hep-ph
27
The categories of this paper are: comp-gas
18
The categories of this paper are: econ
33
The categories of this paper are: plasm-ph
19
The categories of this paper are: eess
24
The categories of this paper are: dg-ga
29
The categories of this paper are: funct-an
8
The categories of this paper are: hep-ex
1
The categories of this paper are: cs
5
The categories of this paper are: gr-qc
9
The categories of this paper are: nlin