The behaviour of dark matter associated with four bright cluster galaxies in the 10 kpc core of Abell 3827

Richard Massey, Liliya Williams, Renske Smit, Mark Swinbank, Thomas D. Kitching, David Harvey, Mathilde Jauzac, Holger Israel, Douglas Clowe, Alastair Edge, Matt Hilton, Eric Jullo, Adrienne Leonard, Jori Liesenborgs, Julian Merten, Irshad Mohammed, Daisuke Nagai, Johan Richard, Andrew Robertson, Prasenjit Saha & 3 others Rebecca Santana, John Stott, Eric Tittley

    Research output: Contribution to journalArticle

    109 Citations (Scopus)

    Abstract

    Galaxy cluster Abell 3827 hosts the stellar remnants of four almost equally bright elliptical galaxies within a core of radius 10 kpc. Such corrugation of the stellar distribution is very rare, and suggests recent formation by several simultaneous mergers. We map the distribution of associated dark matter, using new Hubble Space Telescope imaging and Very Large Telescope/Multi-Unit Spectroscopic Explorer integral field spectroscopy of a gravitationally lensed system threaded through the cluster core. We find that each of the central galaxies retains a dark matter halo, but that (at least) one of these is spatially offset from its stars. The best-constrained offset is 1.62+0.47 -0.49 kpc, where the 68 per cent confidence limit includes both statistical error and systematic biases in mass modelling. Such offsets are not seen in field galaxies, but are predicted during the long infall to a cluster, if dark matter self-interactions generate an extra drag force.With such a small physical separation, it is difficult to definitively rule out astrophysical effects operating exclusively in dense cluster core environments - but if interpreted solely as evidence for self-interacting dark matter, this offset implies a crosssection σDM/m ~ (1.7 ± 0.7) × 10-4 cm2 g-1 × (tinfall/109 yr)-2, where tinfall is the infall duration.

    Original languageEnglish (US)
    Pages (from-to)3393-3406
    Number of pages14
    JournalMonthly Notices of the Royal Astronomical Society
    Volume449
    Issue number4
    DOIs
    StatePublished - Mar 21 2015

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    dark matter
    galaxies
    confidence limits
    elliptical galaxies
    Hubble Space Telescope
    merger
    drag
    halos
    astrophysics
    spectroscopy
    telescopes
    stars
    radii
    modeling
    interactions
    distribution

    Keywords

    • Astroparticle physics
    • Dark matter
    • Galaxies: clusters: individual: Abell 3827
    • Gravitational lensing: strong

    Cite this

    The behaviour of dark matter associated with four bright cluster galaxies in the 10 kpc core of Abell 3827. / Massey, Richard; Williams, Liliya; Smit, Renske; Swinbank, Mark; Kitching, Thomas D.; Harvey, David; Jauzac, Mathilde; Israel, Holger; Clowe, Douglas; Edge, Alastair; Hilton, Matt; Jullo, Eric; Leonard, Adrienne; Liesenborgs, Jori; Merten, Julian; Mohammed, Irshad; Nagai, Daisuke; Richard, Johan; Robertson, Andrew; Saha, Prasenjit; Santana, Rebecca; Stott, John; Tittley, Eric.

    In: Monthly Notices of the Royal Astronomical Society, Vol. 449, No. 4, 21.03.2015, p. 3393-3406.

    Research output: Contribution to journalArticle

    Massey, R, Williams, L, Smit, R, Swinbank, M, Kitching, TD, Harvey, D, Jauzac, M, Israel, H, Clowe, D, Edge, A, Hilton, M, Jullo, E, Leonard, A, Liesenborgs, J, Merten, J, Mohammed, I, Nagai, D, Richard, J, Robertson, A, Saha, P, Santana, R, Stott, J & Tittley, E 2015, 'The behaviour of dark matter associated with four bright cluster galaxies in the 10 kpc core of Abell 3827', Monthly Notices of the Royal Astronomical Society, vol. 449, no. 4, pp. 3393-3406. https://doi.org/10.1093/mnras/stv467
    Massey, Richard ; Williams, Liliya ; Smit, Renske ; Swinbank, Mark ; Kitching, Thomas D. ; Harvey, David ; Jauzac, Mathilde ; Israel, Holger ; Clowe, Douglas ; Edge, Alastair ; Hilton, Matt ; Jullo, Eric ; Leonard, Adrienne ; Liesenborgs, Jori ; Merten, Julian ; Mohammed, Irshad ; Nagai, Daisuke ; Richard, Johan ; Robertson, Andrew ; Saha, Prasenjit ; Santana, Rebecca ; Stott, John ; Tittley, Eric. / The behaviour of dark matter associated with four bright cluster galaxies in the 10 kpc core of Abell 3827. In: Monthly Notices of the Royal Astronomical Society. 2015 ; Vol. 449, No. 4. pp. 3393-3406.
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    abstract = "Galaxy cluster Abell 3827 hosts the stellar remnants of four almost equally bright elliptical galaxies within a core of radius 10 kpc. Such corrugation of the stellar distribution is very rare, and suggests recent formation by several simultaneous mergers. We map the distribution of associated dark matter, using new Hubble Space Telescope imaging and Very Large Telescope/Multi-Unit Spectroscopic Explorer integral field spectroscopy of a gravitationally lensed system threaded through the cluster core. We find that each of the central galaxies retains a dark matter halo, but that (at least) one of these is spatially offset from its stars. The best-constrained offset is 1.62+0.47 -0.49 kpc, where the 68 per cent confidence limit includes both statistical error and systematic biases in mass modelling. Such offsets are not seen in field galaxies, but are predicted during the long infall to a cluster, if dark matter self-interactions generate an extra drag force.With such a small physical separation, it is difficult to definitively rule out astrophysical effects operating exclusively in dense cluster core environments - but if interpreted solely as evidence for self-interacting dark matter, this offset implies a crosssection σDM/m ~ (1.7 ± 0.7) × 10-4 cm2 g-1 × (tinfall/109 yr)-2, where tinfall is the infall duration.",
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    AU - Massey, Richard

    AU - Williams, Liliya

    AU - Smit, Renske

    AU - Swinbank, Mark

    AU - Kitching, Thomas D.

    AU - Harvey, David

    AU - Jauzac, Mathilde

    AU - Israel, Holger

    AU - Clowe, Douglas

    AU - Edge, Alastair

    AU - Hilton, Matt

    AU - Jullo, Eric

    AU - Leonard, Adrienne

    AU - Liesenborgs, Jori

    AU - Merten, Julian

    AU - Mohammed, Irshad

    AU - Nagai, Daisuke

    AU - Richard, Johan

    AU - Robertson, Andrew

    AU - Saha, Prasenjit

    AU - Santana, Rebecca

    AU - Stott, John

    AU - Tittley, Eric

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    N2 - Galaxy cluster Abell 3827 hosts the stellar remnants of four almost equally bright elliptical galaxies within a core of radius 10 kpc. Such corrugation of the stellar distribution is very rare, and suggests recent formation by several simultaneous mergers. We map the distribution of associated dark matter, using new Hubble Space Telescope imaging and Very Large Telescope/Multi-Unit Spectroscopic Explorer integral field spectroscopy of a gravitationally lensed system threaded through the cluster core. We find that each of the central galaxies retains a dark matter halo, but that (at least) one of these is spatially offset from its stars. The best-constrained offset is 1.62+0.47 -0.49 kpc, where the 68 per cent confidence limit includes both statistical error and systematic biases in mass modelling. Such offsets are not seen in field galaxies, but are predicted during the long infall to a cluster, if dark matter self-interactions generate an extra drag force.With such a small physical separation, it is difficult to definitively rule out astrophysical effects operating exclusively in dense cluster core environments - but if interpreted solely as evidence for self-interacting dark matter, this offset implies a crosssection σDM/m ~ (1.7 ± 0.7) × 10-4 cm2 g-1 × (tinfall/109 yr)-2, where tinfall is the infall duration.

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    KW - Gravitational lensing: strong

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