The structure of giant extragalactic H II regions in NGC 1365, 1566, and 2997

Journal Article · Sat Apr 01 04:00:00 EST 1989 · Astron. J.; (United States)

DOI:https://doi.org/10.1086/115045· OSTI ID:5629085

Roy, J R; Belley, J; Walsh, J R

Chains of H-II regions and complexes in NGC 1365, 1566, and 2997 have been spectroscopically mapped. The forbidden N II/forbidden O II, forbidden S II/forbidden O II, and (forbidden O II + forbidden O III)/H-beta line ratios are shown to vary significantly from pixel to pixel, with the amplitude of pixel-to-pixel line fluctuation being highest for line ratios involving forbidden O II and forbidden O III. It is suggested that the line ratio fluctuations are due to the varying density distributions of the electrons and the different line ratios produced by the various ions. 46 refs.

• Research Organization: Observatoire Astronomique du Mont Megantic, Quebec (Canada); Groningen Rijksuniversiteit (Netherlands)
• OSTI ID: 5629085
• Journal Information: Astron. J.; (United States), Journal Name: Astron. J.; (United States) Vol. 97; ISSN ANJOA
• Country of Publication: United States
• Language: English

Related Subjects

640105* -- Astrophysics & Cosmology-- Galaxies
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
CONFIGURATION
COSMIC RADIO SOURCES
ELECTRON DENSITY
ELEMENTS
ENERGY-LEVEL TRANSITIONS
FORBIDDEN TRANSITIONS
GALAXIES
H2 REGIONS
INTERGALACTIC SPACE
MORPHOLOGY
NEBULAE
NITROGEN
NONMETALS
SEMIMETALS
SILICON
SPACE
SPIRAL CONFIGURATION