Galaxy alignment on large and small scales

X. Kang, W. P. Lin, X. Dong, Y. O. Wang, A. Dutton, Andrea Maccio

    Research output: Contribution to journalArticle

    Abstract

    Galaxies are not randomly distributed across the universe but showing different kinds of alignment on different scales. On small scales satellite galaxies have a tendency to distribute along the major axis of the central galaxy, with dependence on galaxy properties that both red satellites and centrals have stronger alignment than their blue counterparts. On large scales, it is found that the major axes of Luminous Red Galaxies (LRGs) have correlation up to 30Mpc/h. Using hydro-dynamical simulation with star formation, we investigate the origin of galaxy alignment on different scales. It is found that most red satellite galaxies stay in the inner region of dark matter halo inside which the shape of central galaxy is well aligned with the dark matter distribution. Red centrals have stronger alignment than blue ones as they live in massive haloes and the central galaxy-halo alignment increases with halo mass. On large scales, the alignment of LRGs is also from the galaxy-halo shape correlation, but with some extent of mis-alignment. The massive haloes have stronger alignment than haloes in filament which connect massive haloes. This is contrary to the naive expectation that cosmic filament is the cause of halo alignment.

    Original languageEnglish (US)
    Pages (from-to)448-451
    Number of pages4
    JournalProceedings of the International Astronomical Union
    Volume11
    DOIs
    StatePublished - Jan 1 2014

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    alignment
    halos
    galaxies
    dark matter
    filaments
    guy wires
    misalignment
    star formation
    tendencies
    universe
    causes
    simulation

    Keywords

    • dark matter halo
    • large-scale structure of universe
    • numerical simulation

    ASJC Scopus subject areas

    • Astronomy and Astrophysics

    Cite this

    Kang, X., Lin, W. P., Dong, X., Wang, Y. O., Dutton, A., & Maccio, A. (2014). Galaxy alignment on large and small scales. Proceedings of the International Astronomical Union, 11, 448-451. https://doi.org/10.1017/S1743921316010346

    Galaxy alignment on large and small scales. / Kang, X.; Lin, W. P.; Dong, X.; Wang, Y. O.; Dutton, A.; Maccio, Andrea.

    In: Proceedings of the International Astronomical Union, Vol. 11, 01.01.2014, p. 448-451.

    Research output: Contribution to journalArticle

    Kang, X, Lin, WP, Dong, X, Wang, YO, Dutton, A & Maccio, A 2014, 'Galaxy alignment on large and small scales', Proceedings of the International Astronomical Union, vol. 11, pp. 448-451. https://doi.org/10.1017/S1743921316010346
    Kang, X. ; Lin, W. P. ; Dong, X. ; Wang, Y. O. ; Dutton, A. ; Maccio, Andrea. / Galaxy alignment on large and small scales. In: Proceedings of the International Astronomical Union. 2014 ; Vol. 11. pp. 448-451.
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