Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: The optical emission nebulae in the vicinity of WR 48 (Theta Mus); True
  Wolf-Rayet ejecta or unconnected supernova remnant?   During searches for new optical Galactic supernova remnants (SNRs) in the
high resolution, high sensitivity Anglo-Australian Observatory/United Kingdom
Schmidt Telescope (AAO/UKST) HAlpha survey of the southern Galactic plane, we
uncovered a variety of filamentary and more diffuse, extensive nebular
structures in the vicinity of Wolf-Rayet (WR) star 48 (Theta Muscae), only some
of which were previously recognised. We used the double-beam spectrograph of
the Mount Stromlo and Siding Spring Observatory (MSSSO) 2.3-m to obtain low and
mid resolution spectra of selected new filaments and structures in this region.
Despite spectral similarities between the optical spectra of WR star shells and
SNRs, a careful assessment of the new spectral and morphological evidence from
our deep HAlpha imagery suggests that the putative shell of Theta Mus is not a
WR shell at all, as has been commonly accepted, but is rather part of a more
complex area of large-scale overlapping nebulosities in the general field of
the WR star. The emission comprises a possible new optical supernova remnant
and a likely series of complex H II regions. Finally, we present the intriguing
detection of apparent collimated, directly opposing, ionized outflows close to
Theta Mus itself which appears unique among such stars. Although possible
artifacts or a temporary phenomenon monitoring of the star is recommended.

21
The categories of this paper are: adap-org
3
The categories of this paper are: physics
5
The categories of this paper are: gr-qc
12
The categories of this paper are: nucl-th
11
The categories of this paper are: hep-lat
4
The categories of this paper are: cond-mat
13
The categories of this paper are: quant-ph
24
The categories of this paper are: dg-ga
8
The categories of this paper are: hep-ex
31
The categories of this paper are: ao-sci
15
The categories of this paper are: nucl-ex
30
The categories of this paper are: q-alg
14
The categories of this paper are: math-ph
10
The categories of this paper are: q-bio
37
The categories of this paper are: supr-con
1
The categories of this paper are: cs