Lyman Alpha Emission and Absorption in Local Galaxies
Abstract
Lecture notes concerning observations of the Lyman alpha (Lyα transition of atomic hydrogen in low-redshift (z) galaxies. Section 1 discusses the main motivations, astrophysical prerequisites, and definitions. Section 2 describes the various instruments that have contributed to the field or are currently capable of observing Lyα at z<1, and their basic characteristics. Section 3 is concerned with the first generation of Lyα observations of quasars and starburst galaxies, using targeted low-resolution spectroscopy. Section 4 is dedicated to systematic surveys, Lyα luminosity functions and equivalent width distributions, and the global properties of galaxies that may influence Lyα Section 5 concerns higher resolution spectroscopy of Lyα and metal absorption lines, and is mostly dedicated to studies of galaxy winds and gas covering. Section 6 is dedicated to high-resolution imaging observations and the existence of large-scale Lyα halos. Section 7 endeavors to present a unifying scenario for Lyα emission from galaxies, synthesizes the results, and discusses what we would like to know from the next generation of observations.
- Publication:
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Saas-Fee Advanced Course
- Pub Date:
- 2019
- DOI:
- 10.1007/978-3-662-59623-4_4
- Bibcode:
- 2019SAAS...46..319H
- Keywords:
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- Physics