A spatially resolved study of ionized regions in galaxies at different ...

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ii CONTENTS 3.3.2 Identification of the position of the spectra . . . . . . . . . . . . . . . . 47 3.3.3 Spectra extraction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48 3.3.4 Wavelength solution (dispersion correction) . . . . . . . . . . . . . . . 50 3.3.5 Fiber-to-fiber response correction . . . . . . . . . . . . . . . . . . . . 51 3.3.6 Flux-calibration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52 3.3.7 Sky-subtraction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 57 3.3.8 Mosaics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 58 3.3.9 Correction for atmospheric absorption . . . . . . . . . . . . . . . . . . 59 3.3.10 Correction for differential atmospheric refraction . . . . . . . . . . . . 61 3.4 Results . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 63 3.4.1 Subtraction of the underlying population . . . . . . . . . . . . . . . . . 63 3.4.2 Line intensities . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 66 3.4.3 Hα maps and morphology . . . . . . . . . . . . . . . . . . . . . . . . . 68 3.4.4 Reddening correction and c(Hβ) map . . . . . . . . . . . . . . . . . . 72 3.4.5 Electron density . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 74 3.4.6 Ionization structure and excitation . . . . . . . . . . . . . . . . . . . . 75 3.4.7 Wolf-Rayet stellar population . . . . . . . . . . . . . . . . . . . . . . . 78 3.4.8 Physical properties and chemical abundances from the integrated spectra . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 81 3.5 Discussion . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 92 3.5.1 Mass of the ionized gas . . . . . . . . . . . . . . . . . . . . . . . . . . 92 3.5.2 Derived properties of the WR population . . . . . . . . . . . . . . . . 94 3.5.3 Metal content . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 96 3.5.4 Ionization structure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 99 4 • Long-slit spectrophotometry of multiple knots of Hii galaxies 105 4.1 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 105 4.2 Observations and reduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . 107 4.2.1 CAHA observations . . . . . . . . . . . . . . . . . . . . . . . . . . . . 107 4.2.2 WHT observations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 108 4.2.3 Data reduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 109 4.3 Results . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 112 4.3.1 Line intensities and reddening correction . . . . . . . . . . . . . . . . 112 4.3.2 Physical conditions of the gas . . . . . . . . . . . . . . . . . . . . . . . 121 4.3.3 Chemical abundance derivation . . . . . . . . . . . . . . . . . . . . . 127 4.4 Discussion . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 131 4.4.1 Gaseous physical conditions and element abundances . . . . . . . . 131 4.4.2 Chemical abundances from empirical calibrators for Knots A and D of IIZw71 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 136 4.4.3 The stellar population . . . . . . . . . . . . . . . . . . . . . . . . . . . 142 4.4.4 Ionising stellar populations . . . . . . . . . . . . . . . . . . . . . . . . 146 4.4.5 Kinematics and dynamics of the polar ring . . . . . . . . . . . . . . . . 147 5 • Conclusions and future work 149 A •Interstellar Reddening Corrections 159
CONTENTS iii B •Physical conditions of the gas and abundances 161 B.1 Physical conditions of the gas . . . . . . . . . . . . . . . . . . . . . . . . . . . 161 B.1.1 Density . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 161 B.1.2 Temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 163 B.2 Ionic abundances . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 164 C •Empirical calibrators 169 D •Stellar photometry results of NGC 5471 173 References 189
Page 1: Facultad de Ciencias Departamento d
Page 5: A Abigaíl, mi ut A mi familia, por
Page 8 and 9: La gente del grupo de Astrofísica
Page 11: Contents List of Figures List of Ta
Page 16 and 17: vi LIST OF FIGURES 3.12 Example of
Page 19 and 20: List of Tables 1.1 Integrated prope
Page 21 and 22: Chapter 1 Introduction 1.1 Overview
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42 3 • IFS of a GEHR in NGC 6946
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β[H 84 3 • IFS of a GEHR in NGC
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Hδ 116 4 • Long-slit spectrophot
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Table 4.4 continued SDSS J1657 Knot
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150 Conclusions and future work has
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154 Conclusions and future work The
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156 Conclusiones Las abundancias to
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158 Conclusiones consistentes con l
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160 Appendix A where c=0.434C. This
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162 Appendix B where R S2 = I(6717
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164 Appendix B Sulphur As in the ca
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166 Appendix B Argon For argon, the
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Appendix C Empirical calibrators In
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C • Empirical calibrators 171 One
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Appendix D Stellar photometry resul
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D • Stellar photometry results of
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190 REFERENCES Bertelli, G., Bressa
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192 REFERENCES Girardi, L. & Bertel
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194 REFERENCES Kunth, D. & Sargent,
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196 REFERENCES Pérez-Montero, E.,
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198 REFERENCES Terlevich, R., Melni
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