Optical properties of the host galaxies of extragalactic nuclear H2O masers

Ingyin Zaw, Guangtun Zhu, Michael Blanton, Lincoln J. Greenhill

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

    Abstract

    Although most nuclear 22GHz (=1.35 cm) H2O masers are in Seyfert 2 and LINER galaxies, only a small fraction of such galaxies host water masers. We systematically study the optical properties of the galaxies with and without nuclear H2O maser emission to better understand the relationship between H2O maser emission and properties of the central supermassive black hole and improve the detection rates in future surveys. To this end, we cross-matched the galaxies from H2O maser surveys, both detections and non-detections, with the Sloan Digital Sky Survey (SDSS) low-redshift galaxy sample. We find that maser detection rates are higher at higher optical luminosity (MB ), larger velocity dispersion (), and higher ion [O III] 5007 luminosity, with [O III] 5007 being the dominant factor, and that the isotropic maser luminosity is correlated with these variables. These correlations are natural if maser emission depends on the host SMBH mass and AGN activity. We also find that the detection rate is higher for galaxies with higher extinction. These results indicate that, by pre-selecting galaxies with high extinction-corrected [O III] 5007 flux, future maser surveys can increase detections efficiencies by a factor of ∼3 to ∼5.

    Original languageEnglish (US)
    Title of host publicationCosmic Masers - from OH to H0
    Pages316-320
    Number of pages5
    Volume8
    EditionS287
    DOIs
    StatePublished - Jul 2012

    Publication series

    NameProceedings of the International Astronomical Union
    NumberS287
    Volume8
    ISSN (Print)17439213
    ISSN (Electronic)17439221

    Fingerprint

    masers
    galaxies
    optical properties
    luminosity
    extinction
    water masers

    Keywords

    • galaxies: active
    • galaxies: nuclei
    • galaxies: Seyfert
    • masers
    • radio lines: galaxies

    ASJC Scopus subject areas

    • Astronomy and Astrophysics

    Cite this

    Zaw, I., Zhu, G., Blanton, M., & Greenhill, L. J. (2012). Optical properties of the host galaxies of extragalactic nuclear H2O masers. In Cosmic Masers - from OH to H0 (S287 ed., Vol. 8, pp. 316-320). (Proceedings of the International Astronomical Union; Vol. 8, No. S287). https://doi.org/10.1017/S1743921312007247

    Optical properties of the host galaxies of extragalactic nuclear H2O masers. / Zaw, Ingyin; Zhu, Guangtun; Blanton, Michael; Greenhill, Lincoln J.

    Cosmic Masers - from OH to H0. Vol. 8 S287. ed. 2012. p. 316-320 (Proceedings of the International Astronomical Union; Vol. 8, No. S287).

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

    Zaw, I, Zhu, G, Blanton, M & Greenhill, LJ 2012, Optical properties of the host galaxies of extragalactic nuclear H2O masers. in Cosmic Masers - from OH to H0. S287 edn, vol. 8, Proceedings of the International Astronomical Union, no. S287, vol. 8, pp. 316-320. https://doi.org/10.1017/S1743921312007247
    Zaw I, Zhu G, Blanton M, Greenhill LJ. Optical properties of the host galaxies of extragalactic nuclear H2O masers. In Cosmic Masers - from OH to H0. S287 ed. Vol. 8. 2012. p. 316-320. (Proceedings of the International Astronomical Union; S287). https://doi.org/10.1017/S1743921312007247
    Zaw, Ingyin ; Zhu, Guangtun ; Blanton, Michael ; Greenhill, Lincoln J. / Optical properties of the host galaxies of extragalactic nuclear H2O masers. Cosmic Masers - from OH to H0. Vol. 8 S287. ed. 2012. pp. 316-320 (Proceedings of the International Astronomical Union; S287).
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    abstract = "Although most nuclear 22GHz (=1.35 cm) H2O masers are in Seyfert 2 and LINER galaxies, only a small fraction of such galaxies host water masers. We systematically study the optical properties of the galaxies with and without nuclear H2O maser emission to better understand the relationship between H2O maser emission and properties of the central supermassive black hole and improve the detection rates in future surveys. To this end, we cross-matched the galaxies from H2O maser surveys, both detections and non-detections, with the Sloan Digital Sky Survey (SDSS) low-redshift galaxy sample. We find that maser detection rates are higher at higher optical luminosity (MB ), larger velocity dispersion (), and higher ion [O III] 5007 luminosity, with [O III] 5007 being the dominant factor, and that the isotropic maser luminosity is correlated with these variables. These correlations are natural if maser emission depends on the host SMBH mass and AGN activity. We also find that the detection rate is higher for galaxies with higher extinction. These results indicate that, by pre-selecting galaxies with high extinction-corrected [O III] 5007 flux, future maser surveys can increase detections efficiencies by a factor of ∼3 to ∼5.",
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