Analysis of the distribution of H II regions in external galaxies. II - Analysis of the spiral structure

Details Analysis of the distribution of H II regions in external galaxies. II - Analysis of the spiral structure Analysis of the distribution of H II regions in external galaxies. II - Analysis of the spiral structure

Aug 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993a%26as..100..431g&link_type=abstract

Astronomy and Astrophysics Supplement Series (ISSN 0365-0138), vol. 100, no. 2, p. 431-464.

Astronomy and Astrophysics

Astrophysics

22

Galactic Structure, H Ii Regions, Interstellar Matter, Luminosity, Spiral Galaxies, Charge Coupled Devices, Density Distribution, Fourier Analysis

Scientific paper

This paper is the second of a series where we study the distribution of H II regions in spiral galaxies. We use a Fourier decomposition to obtain the main spiral components of 44 galaxies, extracted from the sample of Garcia Gomez & Athanassoula (1991) as those having some structure in their H II region distribution. We recompose the density distribution using more than one component from each Fourier spectrum, thus obtaining more accurate results than in previous studies. We also study the dependences of the pitch angles of these components on other physical parameters of the galaxies, like the Hubble type and the arm class. For the galaxies where information on the flux of the H II regions is available, we use the Fourier decomposition to separate the H II regions in the arms from those in the interarm zones. The H II regions in the arms are, on the average, brighter by a factor of the order of 1.25 than those in the interarm. The brightest H II regions are preferentially located in the arms.

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