Physics – Nuclear Physics
Scientific paper
Mar 1982
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982phdt.........5k&link_type=abstract
Ph.D. Thesis California Univ., Santa Cruz.
Physics
Nuclear Physics
10
Digital Techniques, Image Processing, Ionization, Nuclei (Nuclear Physics), Spiral Galaxies, Emission Spectra, Luminosity, Spectrophotometry, Star Clusters
Scientific paper
New spectrophotometry and narrow-band digital images have been obtained for bright spiral galaxies with low-ionization emission regions in their nuclei. These regions are characterized by strong forbidden lines from neutral or once-ionized species, with relatively weak Balmer emission. A survey of H alpha and n ll lambda 6584 emission in a complete sample of 93 spirals shows emission in all nuclei, with low-ionization emission seen in 85% of galaxies of types SO/a through Sbc. For a given stellar continuum luminosity, emission regions excited by stellar photoionization (H ll regions) are more luminous than low-ionization regions; H ll regions may mark or replace existing low-ionization regions when bursts of star formation occur. The narrow-band images have been processed to yield pure H alpha + n ll images. These show that the optically emitting gas in low-ionization spiral nuclei is usually concentrated in a nearly spherical core of half-intensity diameter typically 200 pc, often surrounded by a disk, in the galactic plane, traceable over a 600-900 pc diameter.
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