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Article Contents

ABSTRACT

1.INTRODUCTION
1.1.Key Applications of Lyman alpha
1.2.Lyman alpha Observations of the Nearby Universe - This Review

2.LYMAN ALPHA OBSERVABLES
2.1.Flux, Luminosity, and Equivalent Width
2.2.Lyα/Balmer Ratios and Escape Fraction

3.THE FIRST LOW REDSHIFT LYMAN ALPHA OBSERVATIONS
3.1.The First Lyα Spectra of Active Galactic Nuclei
3.2.Star-forming Galaxies

4.HIGH RESOLUTION SPECTROSCOPY WITH THE HUBBLE SPACE TELESCOPE
4.1.HST Finds Deep Lyα Absorption
4.2.Galaxy Winds and Atomic Gas Kinematics
4.3.Dissecting the Neutral Medium in Detail

5.FROM SMALL TO LARGE SCALES: COMPLETING THE QUANTITATIVE PICTURE WITH HST IMAGING
5.1.Resolved Analyses: A Case Study of Haro 11
5.2.Extended Halos

6.LYMAN ALPHA SURVEYS AT LOW REDSHIFT
6.1.Evolution of Lyman alpha Galaxies into the Nearby Universe
6.2.The Properties of Nearby Lyman alpha Galaxies
6.2.1.Stellar Populations
6.2.2.Galaxy Morphology
6.2.3.Interstellar Dust and Metals
6.2.4.Neutral Gas

7.SYNTHESIZING THE OBSERVATIONAL DATA: WHAT MAKES A LYMAN ALPHA EMITTER?

8.PERSPECTIVES AND FUTURE DEVELOPMENTS: THE MOST PRESSING QUESTIONS
8.1.What is the Atomic Gas Distribution in Star-Forming Galaxies?
8.2.How is the Lyα Spectral Profile Built?
8.3.Ionization State of the Interstellar Medium
8.4.Can we Predict Lyα Observables from Other Information?

REFERENCES