Details

X-ray and Infrared Diagnostics of Star Formation and Black Hole Accretion in Galaxies

by Rigby, Jane Rebecca.

Abstract (Summary)
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 CHAPTER 1 INTRODUCTION . . . . . . . . . . . . . . . . . . . . . . . . . . 13 CHAPTER 2 MISSING MASSIVE STARS IN STARBURSTS: STELLAR TEMPERA- TURE DIAGNOSTICS AND THE IMF . . . . . . . . . . . . . . . . . . . . . . 19 2.1 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20 2.2 Observations, Data Reduction, and Calibration . . . . . . . . . . . . 22 2.2.1 Data Reduction . . . . . . . . . . . . . . . . . . . . . . . . . . 23 2.2.2 Combining Spectra . . . . . . . . . . . . . . . . . . . . . . . . 26 2.2.3 Subtracting the Stellar Continuum . . . . . . . . . . . . . . . 27 2.2.4 Measuring Line Ratios . . . . . . . . . . . . . . . . . . . . . . 28 2.3 Modelling Line Ratio Behavior . . . . . . . . . . . . . . . . . . . . . 31 2.3.1 Models Using Individual Stars . . . . . . . . . . . . . . . . . 34 2.3.2 Spectral Synthesis Models . . . . . . . . . . . . . . . . . . . . 37 2.4 Diagnosics of Stellar Teff In Starburst Galaxies . . . . . . . . . . . . 40 2.4.1 Approaches to Estimating Teff . . . . . . . . . . . . . . . . . 40 2.4.2 Testing He I 2.06 µm/Br? . . . . . . . . . . . . . . . . . . . . 46 2.4.3 Testing Optical Teff Indicators . . . . . . . . . . . . . . . . . 50 2.4.4 Testing the Mid–Infrared Fine Structure Line Ratios . . . . . 55 2.5 Diagnosing Ionizing Conditions in Starburts . . . . . . . . . . . . . 61 2.5.1 Mid–Infrared Line Ratio Dependencies . . . . . . . . . . . . 61 2.5.2 The Spectrum of the Ionizing Radiation . . . . . . . . . . . . 65 2.5.3 Ionizing Conditions in Low Metallicity Starbursts . . . . . . 69 2.5.4 Caveats and Assumptions . . . . . . . . . . . . . . . . . . . . 70 2.5.5 UV and Nebular Diagnostics in Conflict? . . . . . . . . . . . 72 2.6 Discussion . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 75 2.7 Conclusion . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 80
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School:The University of Arizona

School Location:USA - Arizona

Source Type:Master's Thesis

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