Skip to main content Accessibility help
×
  1. Home
  2. Search

Refine search

Refine search

Access:
Content type:
Publication date:
Apply   From and To filters
Subject: Show more
Journals Show more
Publishers: Show more
Societies Show more
Series: Show more
Collections: Show more

Actions for selected content:

Select all | Deselect all
  • View selected items
  • Export citations
  • Download PDF (zip)
  • Save to Kindle
  • Save to Dropbox
  • Save to Google Drive

Save Search

You can save your searches here and later view and run them again in "My saved searches".

Please provide a title, maximum of 40 characters.
Cancel
×

1 results

  • 2 - Modern Framework

  • from Part One - Breakthrough Astrophysics
  • Christopher W. Churchill, New Mexico State University
  • Book:
    Quasar Absorption Lines
    Published online:
    10 December 2025
    Print publication:
    18 December 2025, pp 33-54

  • Summary

    Quasar absorption line studies have matured into a modern science that has contributed to the development of our contemporary cosmological paradigm, ranging from the Big Bang, across Cosmic Noon, to the Present Epoch. Researchers focus on key ions, transitions, and absorption lines because they are most common in the Universe. Each of these lines has a unique cosmic visibility in that there is a strong relationship between the observed wavelength of a redshifted line, the cosmic era in which it originated, and the type of astrophysical environment it probes. In this chapter, we outline the main eras of the evolution of the Universe, describe the phases and ionization conditions of the gas in the Universe, and show the connection between ions/transitions and the cosmic era and gas phases they probe.