Mathematics – Probability
Scientific paper
May 1995
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995phdt.........1r&link_type=abstract
Ph.D. Thesis, Paris Universite Docteur es Sciences Thesis (1995).
Mathematics
Probability
4
H Ii Regions, Active Galaxies, Planetary Nebulae, Emission Spectra, Intensity, Detection, Measurement, Temperature Fluctuations, Photoionisation Models, Redshift Surveys
Scientific paper
The study of ionised nebulae from their emission-line intensities is the aim of this work. It concerns two complementary aspects. Firstly, we have studied the influence of the emission-line detection and measurement procedures in the values of the measured intensities. Secondly, we have developed diagnostic methods for the determination of the nature and physical properties of emission-line objects, using a minimum number of line intensities. Detailed simulations of the emission-line detection and intensity measurement procedures allowed us to estimate the errors committed in the intensity measurement of lines with low signal-to-noise ratio. Obtained results permitted us to show the existence of a bias in the measured intensities distribution and to determine a model for it. Furthermore, we determined analytically the probability distribution function of a intensity lines ratio. In this context, we have studied the effect of uncertainties in the intensity measures, and of temperature fluctuations in the determination of the C/O abundance ratio in planetary nebulae. With the purpose of determining the characteristics and the nature of emission-line objects having only a few line intensities available, we calculated the upper limits for photoionisation by OB stars in diagnostic diagrams. For this we build an extensive grid of photoionisation models covering a wide range of physical conditions in H II regions. The results obtained were used in the determination of the nature of the "Canada-France Redshift Survey" emission-line field galaxies, showing the importance of this type of diagnostic in deep redshift surveys.
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