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- W1964856861 abstract "view Abstract Citations (164) References (28) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS Physical Conditions in the Nuclei of M51 and M81 Peimbert, Manuel Abstract Narrow-band photoelectric photometry of the nuclei of M51 and M81 was carried out with the Crossley and the 120-inch telescopes at Lick Observatory. The intensity of several emission lines, as well as of the continuum at different wavelengths, was obtained. From the [0 i], [0 ii], and [0 iii] line inten- sities, it was found that collisions by thermal electrons are not responsible for the ionization in M81 and M51. This result7 coupled with the observed Balmer decrement in M81, led to the adoption of radiation as the principal mechanisn~ of ionization. The radiation field needed to explain the intensity of Ha in MM and M81 was computed for three black-body temperatures. The predicted contribution of such a radiation field to the integrated observed flux in the most favorable wavelengths of the visual region was found to be very small Large density fluctuations were found in the nuclei of M51 and M81 by comparing the Ne(A3727) density with the Ne(rms) density. From the intensity of the [0 i} X6300 line, it was found that a large fraction of the material in these nuclei is in the neutral form. Solar abundances cannot explain the relative line intensities in the nuclei of M51 and M81 Several arguments are presented which suggest an overabundance of nitrogen in the nuclei of both galaxies. From these arguments it was concluded that most of the variation of the N 11/Ha intensity ratio from the spiral arms to the nuclei of both galaxies is caused by a change of the nitrogen abundance and not by a change of electron temperature Publication: The Astrophysical Journal Pub Date: October 1968 DOI: 10.1086/149738 Bibcode: 1968ApJ...154...33P full text sources ADS | data products NED (3) SIMBAD (2)" @default.
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- W1964856861 date "1968-10-01" @default.
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- W1964856861 title "Physical Conditions in the Nuclei of M51 and M81" @default.
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