Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Statistics and properties of HII regions in a sample of grand design
  galaxies I. Luminosity functions   We present new high quality continuum-subtracted H alpha images of the
grand-design galaxies NGC 157, NGC 3631, NGC 6764 and NGC 6951. We have
determined the positions, angular sizes, and fluxes of their individual HII
regions, and describe statistical properties of the HII region samples. We
construct luminosity functions for all the HII regions in the disc and
separately for arm and interarm zones for each galaxy. The slopes of the
luminosity functions for the complete sample agree well with values published
for other spiral galaxies of comparable morphological type. For three galaxies
we determined the slopes of the luminosity functions for the spiral arm and
interarm zones separately. We find that for NGC 157, NGC 3631, and NGC 6951
these slopes are equal within the errors of determination. We compare our
results to those found from earlier work, specifically for M51 and NGC 6814,
and discuss implications for massive star forming processes.

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The categories of this paper are: hep-ph
37
The categories of this paper are: supr-con
12
The categories of this paper are: nucl-th
7
The categories of this paper are: hep-th
22
The categories of this paper are: chao-dyn
3
The categories of this paper are: physics
8
The categories of this paper are: hep-ex
30
The categories of this paper are: q-alg
15
The categories of this paper are: nucl-ex
16
The categories of this paper are: stat
11
The categories of this paper are: hep-lat
23
The categories of this paper are: solv-int
19
The categories of this paper are: eess
36
The categories of this paper are: cmp-lg
33
The categories of this paper are: plasm-ph
2
The categories of this paper are: math