Origin and ionization of the warm ionized gas in massive early-type galaxies

Renbin Yan, Michael R. Blanton

    Research output: Chapter in Book/Report/Conference proceedingConference contribution

    Abstract

    Most early-type galaxies are not devoid of cold and warm gas. The origin and ionization of this gas reveal the intriguing ongoing evolution of these galaxies. In most cases, the warm ionized gas shows emission-line spectra similar to low-ionization nuclear emission-line regions (LINERs). Their ionization mechanism has been hotly debated. We will present evidence from line ratio gradient that rules out AGN and shocks as the dominant ionization mechanism, and suggests the ionizing sources follow the stellar density profile. Hot evolved stars are the favorite candidates but bring new puzzles. This finding allows us to obtain a gas-phase metallicity calibration in these early-type galaxies, using the line emission. We will show how the metallicity of the warm gas depends on stellar mass and stellar age, and what it tells us about the origin of the warm gas in these galaxies.

    Original languageEnglish (US)
    Title of host publicationThe Intriguing Life of Massive Galaxies
    Pages328-331
    Number of pages4
    Volume8
    EditionS295
    DOIs
    StatePublished - Aug 2012

    Publication series

    NameProceedings of the International Astronomical Union
    NumberS295
    Volume8
    ISSN (Print)17439213
    ISSN (Electronic)17439221

    Fingerprint

    ionized gases
    galaxies
    ionization
    gases
    metallicity
    hot stars
    cold gas
    stellar mass
    line spectra
    emission spectra
    shock
    vapor phases
    gradients
    profiles

    Keywords

    • cD
    • galaxies: elliptical and lenticular
    • galaxies:ISM
    • stars: AGB and post-AGB

    ASJC Scopus subject areas

    • Astronomy and Astrophysics

    Cite this

    Yan, R., & Blanton, M. R. (2012). Origin and ionization of the warm ionized gas in massive early-type galaxies. In The Intriguing Life of Massive Galaxies (S295 ed., Vol. 8, pp. 328-331). (Proceedings of the International Astronomical Union; Vol. 8, No. S295). https://doi.org/10.1017/S1743921313005279

    Origin and ionization of the warm ionized gas in massive early-type galaxies. / Yan, Renbin; Blanton, Michael R.

    The Intriguing Life of Massive Galaxies. Vol. 8 S295. ed. 2012. p. 328-331 (Proceedings of the International Astronomical Union; Vol. 8, No. S295).

    Research output: Chapter in Book/Report/Conference proceedingConference contribution

    Yan, R & Blanton, MR 2012, Origin and ionization of the warm ionized gas in massive early-type galaxies. in The Intriguing Life of Massive Galaxies. S295 edn, vol. 8, Proceedings of the International Astronomical Union, no. S295, vol. 8, pp. 328-331. https://doi.org/10.1017/S1743921313005279
    Yan R, Blanton MR. Origin and ionization of the warm ionized gas in massive early-type galaxies. In The Intriguing Life of Massive Galaxies. S295 ed. Vol. 8. 2012. p. 328-331. (Proceedings of the International Astronomical Union; S295). https://doi.org/10.1017/S1743921313005279
    Yan, Renbin ; Blanton, Michael R. / Origin and ionization of the warm ionized gas in massive early-type galaxies. The Intriguing Life of Massive Galaxies. Vol. 8 S295. ed. 2012. pp. 328-331 (Proceedings of the International Astronomical Union; S295).
    @inproceedings{da1659ad683b4a64a8c1b42f8dcda4c5,
    title = "Origin and ionization of the warm ionized gas in massive early-type galaxies",
    abstract = "Most early-type galaxies are not devoid of cold and warm gas. The origin and ionization of this gas reveal the intriguing ongoing evolution of these galaxies. In most cases, the warm ionized gas shows emission-line spectra similar to low-ionization nuclear emission-line regions (LINERs). Their ionization mechanism has been hotly debated. We will present evidence from line ratio gradient that rules out AGN and shocks as the dominant ionization mechanism, and suggests the ionizing sources follow the stellar density profile. Hot evolved stars are the favorite candidates but bring new puzzles. This finding allows us to obtain a gas-phase metallicity calibration in these early-type galaxies, using the line emission. We will show how the metallicity of the warm gas depends on stellar mass and stellar age, and what it tells us about the origin of the warm gas in these galaxies.",
    keywords = "cD, galaxies: elliptical and lenticular, galaxies:ISM, stars: AGB and post-AGB",
    author = "Renbin Yan and Blanton, {Michael R.}",
    year = "2012",
    month = "8",
    doi = "10.1017/S1743921313005279",
    language = "English (US)",
    isbn = "9781107033849",
    volume = "8",
    series = "Proceedings of the International Astronomical Union",
    number = "S295",
    pages = "328--331",
    booktitle = "The Intriguing Life of Massive Galaxies",
    edition = "S295",

    }

    TY - GEN

    T1 - Origin and ionization of the warm ionized gas in massive early-type galaxies

    AU - Yan, Renbin

    AU - Blanton, Michael R.

    PY - 2012/8

    Y1 - 2012/8

    N2 - Most early-type galaxies are not devoid of cold and warm gas. The origin and ionization of this gas reveal the intriguing ongoing evolution of these galaxies. In most cases, the warm ionized gas shows emission-line spectra similar to low-ionization nuclear emission-line regions (LINERs). Their ionization mechanism has been hotly debated. We will present evidence from line ratio gradient that rules out AGN and shocks as the dominant ionization mechanism, and suggests the ionizing sources follow the stellar density profile. Hot evolved stars are the favorite candidates but bring new puzzles. This finding allows us to obtain a gas-phase metallicity calibration in these early-type galaxies, using the line emission. We will show how the metallicity of the warm gas depends on stellar mass and stellar age, and what it tells us about the origin of the warm gas in these galaxies.

    AB - Most early-type galaxies are not devoid of cold and warm gas. The origin and ionization of this gas reveal the intriguing ongoing evolution of these galaxies. In most cases, the warm ionized gas shows emission-line spectra similar to low-ionization nuclear emission-line regions (LINERs). Their ionization mechanism has been hotly debated. We will present evidence from line ratio gradient that rules out AGN and shocks as the dominant ionization mechanism, and suggests the ionizing sources follow the stellar density profile. Hot evolved stars are the favorite candidates but bring new puzzles. This finding allows us to obtain a gas-phase metallicity calibration in these early-type galaxies, using the line emission. We will show how the metallicity of the warm gas depends on stellar mass and stellar age, and what it tells us about the origin of the warm gas in these galaxies.

    KW - cD

    KW - galaxies: elliptical and lenticular

    KW - galaxies:ISM

    KW - stars: AGB and post-AGB

    UR - http://www.scopus.com/inward/record.url?scp=84880440316&partnerID=8YFLogxK

    UR - http://www.scopus.com/inward/citedby.url?scp=84880440316&partnerID=8YFLogxK

    U2 - 10.1017/S1743921313005279

    DO - 10.1017/S1743921313005279

    M3 - Conference contribution

    SN - 9781107033849

    VL - 8

    T3 - Proceedings of the International Astronomical Union

    SP - 328

    EP - 331

    BT - The Intriguing Life of Massive Galaxies

    ER -