TY - JOUR
T1 - Dark matter dynamics in Abell 3827
T2 - New data consistent with standard cold dark matter
AU - Massey, Richard
AU - Harvey, David
AU - Liesenborgs, Jori
AU - Richard, Johan
AU - Stach, Stuart
AU - Swinbank, Mark
AU - Taylor, Peter
AU - Williams, Liliya
AU - Clowe, Douglas
AU - Courbin, Frédéric
AU - Edge, Alastair
AU - Israel, Holger
AU - Jauzac, Mathilde
AU - Joseph, Rémy
AU - Jullo, Eric
AU - Kitching, Thomas D.
AU - Leonard, Adrienne
AU - Merten, Julian
AU - Nagai, Daisuke
AU - Nightingale, James
AU - Robertson, Andrew
AU - Romualdez, Luis Javier
AU - Saha, Prasenjit
AU - Smit, Renske
AU - Tam, Sut Ieng
AU - Tittley, Eric
N1 - Publisher Copyright:
© 2018 The Author(s). Published by Oxford University Press on behalf of the Royal Astronomical Society.
PY - 2018/6/11
Y1 - 2018/6/11
N2 - We present integral field spectroscopy of galaxy cluster Abell 3827, using Atacama Large Millimetre Array (ALMA) and Very Large Telescope/Multi-Unit Spectroscopic Explorer. It reveals an unusual configuration of strong gravitational lensing in the cluster core, with at least seven lensed images of a single background spiral galaxy. Lens modelling based on Hubble Space Telescope imaging had suggested that the dark matter associated with one of the cluster's central galaxies may be offset. The new spectroscopic data enable better subtraction of foreground light, and better identification of multiple background images. The inferred distribution of dark matter is consistent with being centred on the galaxies, as expected by Λ cold dark matter. Each galaxy's dark matter also appears to be symmetric. Whilst, we do not find an offset between mass and light (suggestive of self-interacting dark matter) as previously reported, the numerical simulations that have been performed to calibrate Abell 3827 indicate that offsets and asymmetry are still worth looking for in collisions with particular geometries. Meanwhile, ALMA proves exceptionally useful for strong lens image identifications.
AB - We present integral field spectroscopy of galaxy cluster Abell 3827, using Atacama Large Millimetre Array (ALMA) and Very Large Telescope/Multi-Unit Spectroscopic Explorer. It reveals an unusual configuration of strong gravitational lensing in the cluster core, with at least seven lensed images of a single background spiral galaxy. Lens modelling based on Hubble Space Telescope imaging had suggested that the dark matter associated with one of the cluster's central galaxies may be offset. The new spectroscopic data enable better subtraction of foreground light, and better identification of multiple background images. The inferred distribution of dark matter is consistent with being centred on the galaxies, as expected by Λ cold dark matter. Each galaxy's dark matter also appears to be symmetric. Whilst, we do not find an offset between mass and light (suggestive of self-interacting dark matter) as previously reported, the numerical simulations that have been performed to calibrate Abell 3827 indicate that offsets and asymmetry are still worth looking for in collisions with particular geometries. Meanwhile, ALMA proves exceptionally useful for strong lens image identifications.
KW - Astroparticle physics
KW - Dark matter
KW - Galaxies: Clusters: Individual: Abell 3827
KW - Gravitational lensing: Strong
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U2 - 10.1093/mnras/sty630
DO - 10.1093/mnras/sty630
M3 - Article
AN - SCOPUS:85046664521
SN - 0035-8711
VL - 477
SP - 669
EP - 677
JO - Monthly Notices of the Royal Astronomical Society
JF - Monthly Notices of the Royal Astronomical Society
IS - 1
ER -