The Ionization of the Warm Gas in Early-type Galaxies and Its UV Upturn

Renbin Yan, Michael R. Blanton

    Research output: Contribution to journalArticle


    It has long been known that the majority of early-type galaxies contain warm ionized gas producing optical emission lines. These warm ionized gas are spatially extended to kpc scales. Their line ratios satisify the criteria of Low-ionization Nuclear Emission-line Regions (LINERs) on all major line-ratio diagnostic diagrams. However, their ionization mechanism has been hotly debated. Multiple ionization mechanisms can produce the same kind of line ratios, including photoionization by a central AGN, photoionization by hot evolved stars (e.g. post-AGB stars), collisional ionization by fast shocks, photoionization by hot X-ray emitting gas, and conductive heating or turbulent mixing. Therefore, determining the ionization mechanism requires other information.

    Original languageEnglish (US)
    Number of pages1
    JournalProceedings of the International Astronomical Union
    Issue numberH16
    StatePublished - 2012

    ASJC Scopus subject areas

    • Medicine (miscellaneous)
    • Astronomy and Astrophysics
    • Nutrition and Dietetics
    • Public Health, Environmental and Occupational Health
    • Space and Planetary Science

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