1995/09/11 by M. Rozas, Rozas, M., J. E. Beckman +3
Physics and Astronomy · #Astronomy and Astrophysical Research #Astrophysics (astro-ph) #FOS: Physical sciences #Galaxies: Formation, Evolution, Phenomena #Stellar, planetary, and galactic studies #astro-ph
paper · pdf · doi:10.48550/arxiv.astro-ph/9509060
10 pages, uuencoded compressed postscript file including three figures. Figures 1a,b,c,d and 2a,b,c,d (postscript) are available by anonymous ftp to ftp://ftp.astro.umontreal.ca/incoming/knapen/rozas, where the complete preprint is also stored. Accepted for publication in Astronomy & Astrophysics
arxiv created 1995/09/11 · openalex publication_date 1995/09/11 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
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.