Computer Science
Scientific paper
Mar 1982
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982phdt........34m&link_type=abstract
Thesis (PH.D.)--UNIVERSITY OF TORONTO (CANADA), 1982.Source: Dissertation Abstracts International, Volume: 43-03, Section: B, pa
Computer Science
1
Scientific paper
Broadband photometry between 0.35 and 3.5 (mu)m has been obtained for a sample of approximately fifty X -ray selected Seyfert galaxies and quasars. For the nearby objects, multiaperture observations were made. A model -fitting procedure has been used to separate the stellar and non-stellar components of the optical/infrared continua of these objects. The results show that the non-stellar emission of most low- and intermediate-luminosity X-ray galaxies comprises a flat-spectrum (probably nonthermal) component which dominates the optical region, and a very steep spectral feature which is dominant in the near-infrared. I suggest that this latter feature is associated with hot dust in the nuclei of X-ray galaxies. Analysis of the present data in conjunction with previous work shows that strong correlations exist among the various line and continuum observables associated with the high density regions in active nuclei. In particular, an extremely strong correlation is found between the 3.5 (mu)m luminosities and the X-ray luminosities. Additional correlations exist between the X-ray fluxes and both the 1400 MHz and {OIII} fluxes. This suggests that the nuclear source may affect the star formation processes in the narrow-line regions of active nuclei. Medium-resolution spectrophotometry of NGC 4151 between 2 and 4 (mu)m has led to the detection of the B(alpha) and B(gamma) lines of hydrogen in emission. The B(alpha)/H(gamma) ratio yields an upper limit of E(B-V) = 0.13 mag for the nuclear reddening. The near-infrared continuum of NGC 4151 is a combination of starlight, hot (600 K) dust emission, and a third component which is either very hot (1500 K) dust emission, or a power-law spectrum, or some combination of these. There is probably enough column density in the hot dust to account for the observed nuclear reddening.
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