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    Nuclear starburst activity induced by elongated bulges in spiral galaxies

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    Author
    Kim, Eunbin
    Kim, Sungsoo S
    Choi, Yun-Young
    Lee, Gwang-Ho
    de Grijs, Richard
    Lee, Myung Gyoon
    Hwang, Ho Seong
    Affiliation
    Univ Arizona, Steward Observ
    Issue Date
    2018-06-05
    Keywords
    galaxies: bulges galaxies: evolution
    galaxies: formation
    galaxies: spiral
    galaxies: starburst
    galaxies: star formation
    
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    Publisher
    OXFORD UNIV PRESS
    Citation
    Eunbin Kim, Sungsoo S Kim, Yun-Young Choi, Gwang-Ho Lee, Richard de Grijs, Myung Gyoon Lee, Ho Seong Hwang, Nuclear starburst activity induced by elongated bulges in spiral galaxies, Monthly Notices of the Royal Astronomical Society, Volume 479, Issue 1, September 2018, Pages 562–569, https://doi.org/10.1093/mnras/sty1451
    Journal
    MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
    Rights
    Copyright © 2018 The Author(s) Published by Oxford University Press on behalf of the Royal Astronomical Society.
    Collection Information
    This item from the UA Faculty Publications collection is made available by the University of Arizona with support from the University of Arizona Libraries. If you have questions, please contact us at repository@u.library.arizona.edu.
    Abstract
    We study the effects of bulge elongation on the star formation activity in the centres of spiral galaxies using the data from the Sloan Digital Sky Survey Data Release 7. We construct a volume-limited sample of face-on spiral galaxies with Mr < −19.5 mag at 0.02 ≤ z < 0.055 by excluding barred galaxies, where the aperture of the SDSS spectroscopic fibre covers the bulges of the galaxies. We adopt the ellipticity of bulges measured by Simard et al., who performed two-dimensional bulge + disc decompositions using the SDSS images of galaxies, and identify nuclear starbursts using the fibre specific star formation rates derived from the SDSS spectra. We find a statistically significant correlation between bulge elongation and nuclear starbursts in the sense that the fraction of nuclear starbursts increases with bulge elongation. This correlation is more prominent for fainter and redder galaxies, which exhibit higher ratios of elongated bulges. We find no significant environmental dependence of the correlation between bulge elongation and nuclear starbursts. These results suggest that non-axisymmetric bulges can efficiently feed the gas into the centre of galaxies to trigger nuclear starburst activity.
    ISSN
    0035-8711
    DOI
    10.1093/mnras/sty1451
    Version
    Final published version
    Sponsors
    National Research Foundation -Ministry of Science, ICT and Future Planning of Korea [NRF-2014R1A2A1A11052367]; KASI-Arizona Fellowship; National Natural Science Foundation of China [U1631102, 11373010, 11633005]; National Key Research and Development Program of China [2017YFA0402702]; National Research Foundation (NRF) of Korea - Korean Government [NRF-2017R1A2B4004632]; National Research Foundation of Korea [2017R1A5A1070354]; Alfred P. Sloan Foundation; National Science Foundation; U.S. Department of Energy; National Aeronautics and Space Administration; Japanese Monbukagakusho; Max Planck Society; Higher Education Funding Council for England; American Museum of Natural History; Astrophysical Institute Potsdam; University of Basel; University of Cambridge; Case Western Reserve University; University of Chicago; Drexel University; Fermilab; Institute for Advanced Study; Japan Participation Group; Johns Hopkins University; Joint Institute for Nuclear Astrophysics; Kavli Institute for Particle Astrophysics and Cosmology; Korean Scientist Group; Chinese Academy of Sciences (LAMOST); Los Alamos National Laboratory; Max-Planck-Institute for Astronomy (MPIA); Max-Planck-Institute for Astrophysics (MPA); New Mexico State University; Ohio State University; University of Pittsburgh; University of Portsmouth; Princeton University; United States Naval Observatory; University of Washington
    ae974a485f413a2113503eed53cd6c53
    10.1093/mnras/sty1451
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