Core or Cusps: The Central Dark Matter Profile of a Strong Lensing Cluster with a Bright Central Image at Redshift 1

Thomas E. Collett; Elizabeth Buckley-Geer; Huan Lin; David Bacon; Robert C. Nichol; Brian Nord; Xan Morice-Atkinson; Adam Amara; Simon Birrer; Nikolay Kuropatkin; Anupreeta More; Casey Papovich; Kathy K. Romer; Nicolas Tessore; Tim M.C. Abbott; Sahar Allam; James Annis; Aurlien Benoit-Lévy; David Brooks; David L. Burke; Matias Carrasco Kind; Francisco Javier J. Castander; Chris B. D'Andrea; Luiz N. Da Costa; Shantanu Desai; H. Thomas Diehl; Peter Doel; Tim F. Eifler; Brenna Flaugher; Josh Frieman; David W. Gerdes; Daniel A. Goldstein; Daniel Gruen; Julia Gschwend; Gaston Gutierrez; David J. James; Kyler Kuehn; Steve Kuhlmann; Ofer Lahav; Ting S. Li; Marcos Lima; Marcio A.G. Maia; Marisa March; Jennifer L. Marshall; Paul Martini; Peter Melchior; Ramon Miquel; Andrs A. Plazas; Eli S. Rykoff; Eusebio Sanchez; Vic Scarpine; Rafe Schindler; Michael Schubnell; Ignacio Sevilla-Noarbe; Mathew Smith; Flavia Sobreira; Eric Suchyta; Molly E.C. Swanson; Gregory Tarle; Douglas L. Tucker; Alistair R. Walker

doi:10.3847/1538-4357/aa76e6

Core or Cusps: The Central Dark Matter Profile of a Strong Lensing Cluster with a Bright Central Image at Redshift 1

Thomas E. Collett, Elizabeth Buckley-Geer, Huan Lin, David Bacon, Robert C. Nichol, Brian Nord, Xan Morice-Atkinson, Adam Amara, Simon Birrer, Nikolay Kuropatkin, Anupreeta More, Casey Papovich, Kathy K. Romer, Nicolas Tessore, Tim M.C. Abbott, Sahar Allam, James Annis, Aurlien Benoit-Lévy, David Brooks, David L. BurkeMatias Carrasco Kind, Francisco Javier J. Castander, Chris B. D'Andrea, Luiz N. Da Costa, Shantanu Desai, H. Thomas Diehl, Peter Doel, Tim F. Eifler, Brenna Flaugher, Josh Frieman, David W. Gerdes, Daniel A. Goldstein, Daniel Gruen, Julia Gschwend, Gaston Gutierrez, David J. James, Kyler Kuehn, Steve Kuhlmann, Ofer Lahav, Ting S. Li, Marcos Lima, Marcio A.G. Maia, Marisa March, Jennifer L. Marshall, Paul Martini, Peter Melchior, Ramon Miquel, Andrs A. Plazas, Eli S. Rykoff, Eusebio Sanchez, Vic Scarpine, Rafe Schindler, Michael Schubnell, Ignacio Sevilla-Noarbe, Mathew Smith, Flavia Sobreira, Eric Suchyta, Molly E.C. Swanson, Gregory Tarle, Douglas L. Tucker, Alistair R. Walker

Workflow Systems

Research output: Contribution to journal › Article › peer-review

23 Scopus citations

Abstract

We report on SPT-CLJ2011-5228, a giant system of arcs created by a cluster at z = 1.06. The arc system is notable for the presence of a bright central image. The source is a Lyman break galaxy at z _s = 2.39 and the mass enclosed within the Einstein ring of radius 14 arcsec is . We perform a full reconstruction of the light profile of the lensed images to precisely infer the parameters of the mass distribution. The brightness of the central image demands that the central total density profile of the lens be shallow. By fitting the dark matter as a generalized Navarro-Frenk-White profile - with a free parameter for the inner density slope - we find that the break radius is kpc, and that the inner density falls with radius to the power -0.38 ±0.04 at 68% confidence. Such a shallow profile is in strong tension with our understanding of relaxed cold dark matter halos; dark matter-only simulations predict that the inner density should fall as . The tension can be alleviated if this cluster is in fact a merger; a two-halo model can also reconstruct the data, with both clumps (density varying as and ) much more consistent with predictions from dark matter-only simulations. At the resolution of our Dark Energy Survey imaging, we are unable to choose between these two models, but we make predictions for forthcoming Hubble Space Telescope imaging that will decisively distinguish between them.

Original language	English
Article number	148
Journal	Astrophysical Journal
Volume	843
Issue number	2
DOIs	https://doi.org/10.3847/1538-4357/aa76e6
State	Published - Jul 10 2017

Funding

Funders	Funder number
National Science Foundation	1125897
Directorate for Mathematical and Physical Sciences	1138766
Science and Technology Facilities Council	ST/N000668/1

Keywords

dark matter
galaxies: clusters: individual (SPT-CLJ2011-5228)
galaxies: halos
gravitational lensing: strong

Access to Document

10.3847/1538-4357/aa76e6

Cite this

Collett, T. E., Buckley-Geer, E., Lin, H., Bacon, D., Nichol, R. C., Nord, B., Morice-Atkinson, X., Amara, A., Birrer, S., Kuropatkin, N., More, A., Papovich, C., Romer, K. K., Tessore, N., Abbott, T. M. C., Allam, S., Annis, J., Benoit-Lévy, A., Brooks, D., ... Walker, A. R. (2017). Core or Cusps: The Central Dark Matter Profile of a Strong Lensing Cluster with a Bright Central Image at Redshift 1. Astrophysical Journal, 843(2), Article 148. https://doi.org/10.3847/1538-4357/aa76e6

@article{aea31226c91043489f8b0b0ab66cb51f,

title = "Core or Cusps: The Central Dark Matter Profile of a Strong Lensing Cluster with a Bright Central Image at Redshift 1",

abstract = "We report on SPT-CLJ2011-5228, a giant system of arcs created by a cluster at z = 1.06. The arc system is notable for the presence of a bright central image. The source is a Lyman break galaxy at z s = 2.39 and the mass enclosed within the Einstein ring of radius 14 arcsec is . We perform a full reconstruction of the light profile of the lensed images to precisely infer the parameters of the mass distribution. The brightness of the central image demands that the central total density profile of the lens be shallow. By fitting the dark matter as a generalized Navarro-Frenk-White profile - with a free parameter for the inner density slope - we find that the break radius is kpc, and that the inner density falls with radius to the power -0.38 ±0.04 at 68% confidence. Such a shallow profile is in strong tension with our understanding of relaxed cold dark matter halos; dark matter-only simulations predict that the inner density should fall as . The tension can be alleviated if this cluster is in fact a merger; a two-halo model can also reconstruct the data, with both clumps (density varying as and ) much more consistent with predictions from dark matter-only simulations. At the resolution of our Dark Energy Survey imaging, we are unable to choose between these two models, but we make predictions for forthcoming Hubble Space Telescope imaging that will decisively distinguish between them.",

keywords = "dark matter, galaxies: clusters: individual (SPT-CLJ2011-5228), galaxies: halos, gravitational lensing: strong",

author = "Collett, {Thomas E.} and Elizabeth Buckley-Geer and Huan Lin and David Bacon and Nichol, {Robert C.} and Brian Nord and Xan Morice-Atkinson and Adam Amara and Simon Birrer and Nikolay Kuropatkin and Anupreeta More and Casey Papovich and Romer, {Kathy K.} and Nicolas Tessore and Abbott, {Tim M.C.} and Sahar Allam and James Annis and Aurlien Benoit-L{\'e}vy and David Brooks and Burke, {David L.} and {Carrasco Kind}, Matias and Castander, {Francisco Javier J.} and D'Andrea, {Chris B.} and {Da Costa}, {Luiz N.} and Shantanu Desai and Diehl, {H. Thomas} and Peter Doel and Eifler, {Tim F.} and Brenna Flaugher and Josh Frieman and Gerdes, {David W.} and Goldstein, {Daniel A.} and Daniel Gruen and Julia Gschwend and Gaston Gutierrez and James, {David J.} and Kyler Kuehn and Steve Kuhlmann and Ofer Lahav and Li, {Ting S.} and Marcos Lima and Maia, {Marcio A.G.} and Marisa March and Marshall, {Jennifer L.} and Paul Martini and Peter Melchior and Ramon Miquel and Plazas, {Andrs A.} and Rykoff, {Eli S.} and Eusebio Sanchez and Vic Scarpine and Rafe Schindler and Michael Schubnell and Ignacio Sevilla-Noarbe and Mathew Smith and Flavia Sobreira and Eric Suchyta and Swanson, {Molly E.C.} and Gregory Tarle and Tucker, {Douglas L.} and Walker, {Alistair R.}",

year = "2017",

month = jul,

day = "10",

doi = "10.3847/1538-4357/aa76e6",

language = "English",

volume = "843",

journal = "Astrophysical Journal",

issn = "0004-637X",

publisher = "American Astronomical Society",

number = "2",

}

Collett, TE, Buckley-Geer, E, Lin, H, Bacon, D, Nichol, RC, Nord, B, Morice-Atkinson, X, Amara, A, Birrer, S, Kuropatkin, N, More, A, Papovich, C, Romer, KK, Tessore, N, Abbott, TMC, Allam, S, Annis, J, Benoit-Lévy, A, Brooks, D, Burke, DL, Carrasco Kind, M, Castander, FJJ, D'Andrea, CB, Da Costa, LN, Desai, S, Diehl, HT, Doel, P, Eifler, TF, Flaugher, B, Frieman, J, Gerdes, DW, Goldstein, DA, Gruen, D, Gschwend, J, Gutierrez, G, James, DJ, Kuehn, K, Kuhlmann, S, Lahav, O, Li, TS, Lima, M, Maia, MAG, March, M, Marshall, JL, Martini, P, Melchior, P, Miquel, R, Plazas, AA, Rykoff, ES, Sanchez, E, Scarpine, V, Schindler, R, Schubnell, M, Sevilla-Noarbe, I, Smith, M, Sobreira, F, Suchyta, E, Swanson, MEC, Tarle, G, Tucker, DL & Walker, AR 2017, 'Core or Cusps: The Central Dark Matter Profile of a Strong Lensing Cluster with a Bright Central Image at Redshift 1', Astrophysical Journal, vol. 843, no. 2, 148. https://doi.org/10.3847/1538-4357/aa76e6

TY - JOUR

T1 - Core or Cusps

T2 - The Central Dark Matter Profile of a Strong Lensing Cluster with a Bright Central Image at Redshift 1

AU - Collett, Thomas E.

AU - Buckley-Geer, Elizabeth

AU - Lin, Huan

AU - Bacon, David

AU - Nichol, Robert C.

AU - Nord, Brian

AU - Morice-Atkinson, Xan

AU - Amara, Adam

AU - Birrer, Simon

AU - Kuropatkin, Nikolay

AU - More, Anupreeta

AU - Papovich, Casey

AU - Romer, Kathy K.

AU - Tessore, Nicolas

AU - Abbott, Tim M.C.

AU - Allam, Sahar

AU - Annis, James

AU - Benoit-Lévy, Aurlien

AU - Brooks, David

AU - Burke, David L.

AU - Carrasco Kind, Matias

AU - Castander, Francisco Javier J.

AU - D'Andrea, Chris B.

AU - Da Costa, Luiz N.

AU - Desai, Shantanu

AU - Diehl, H. Thomas

AU - Doel, Peter

AU - Eifler, Tim F.

AU - Flaugher, Brenna

AU - Frieman, Josh

AU - Gerdes, David W.

AU - Goldstein, Daniel A.

AU - Gruen, Daniel

AU - Gschwend, Julia

AU - Gutierrez, Gaston

AU - James, David J.

AU - Kuehn, Kyler

AU - Kuhlmann, Steve

AU - Lahav, Ofer

AU - Li, Ting S.

AU - Lima, Marcos

AU - Maia, Marcio A.G.

AU - March, Marisa

AU - Marshall, Jennifer L.

AU - Martini, Paul

AU - Melchior, Peter

AU - Miquel, Ramon

AU - Plazas, Andrs A.

AU - Rykoff, Eli S.

AU - Sanchez, Eusebio

AU - Scarpine, Vic

AU - Schindler, Rafe

AU - Schubnell, Michael

AU - Sevilla-Noarbe, Ignacio

AU - Smith, Mathew

AU - Sobreira, Flavia

AU - Suchyta, Eric

AU - Swanson, Molly E.C.

AU - Tarle, Gregory

AU - Tucker, Douglas L.

AU - Walker, Alistair R.

PY - 2017/7/10

Y1 - 2017/7/10

N2 - We report on SPT-CLJ2011-5228, a giant system of arcs created by a cluster at z = 1.06. The arc system is notable for the presence of a bright central image. The source is a Lyman break galaxy at z s = 2.39 and the mass enclosed within the Einstein ring of radius 14 arcsec is . We perform a full reconstruction of the light profile of the lensed images to precisely infer the parameters of the mass distribution. The brightness of the central image demands that the central total density profile of the lens be shallow. By fitting the dark matter as a generalized Navarro-Frenk-White profile - with a free parameter for the inner density slope - we find that the break radius is kpc, and that the inner density falls with radius to the power -0.38 ±0.04 at 68% confidence. Such a shallow profile is in strong tension with our understanding of relaxed cold dark matter halos; dark matter-only simulations predict that the inner density should fall as . The tension can be alleviated if this cluster is in fact a merger; a two-halo model can also reconstruct the data, with both clumps (density varying as and ) much more consistent with predictions from dark matter-only simulations. At the resolution of our Dark Energy Survey imaging, we are unable to choose between these two models, but we make predictions for forthcoming Hubble Space Telescope imaging that will decisively distinguish between them.

AB - We report on SPT-CLJ2011-5228, a giant system of arcs created by a cluster at z = 1.06. The arc system is notable for the presence of a bright central image. The source is a Lyman break galaxy at z s = 2.39 and the mass enclosed within the Einstein ring of radius 14 arcsec is . We perform a full reconstruction of the light profile of the lensed images to precisely infer the parameters of the mass distribution. The brightness of the central image demands that the central total density profile of the lens be shallow. By fitting the dark matter as a generalized Navarro-Frenk-White profile - with a free parameter for the inner density slope - we find that the break radius is kpc, and that the inner density falls with radius to the power -0.38 ±0.04 at 68% confidence. Such a shallow profile is in strong tension with our understanding of relaxed cold dark matter halos; dark matter-only simulations predict that the inner density should fall as . The tension can be alleviated if this cluster is in fact a merger; a two-halo model can also reconstruct the data, with both clumps (density varying as and ) much more consistent with predictions from dark matter-only simulations. At the resolution of our Dark Energy Survey imaging, we are unable to choose between these two models, but we make predictions for forthcoming Hubble Space Telescope imaging that will decisively distinguish between them.

KW - dark matter

KW - galaxies: clusters: individual (SPT-CLJ2011-5228)

KW - galaxies: halos

KW - gravitational lensing: strong

UR - http://www.scopus.com/inward/record.url?scp=85025110015&partnerID=8YFLogxK

U2 - 10.3847/1538-4357/aa76e6

DO - 10.3847/1538-4357/aa76e6

M3 - Article

AN - SCOPUS:85025110015

SN - 0004-637X

VL - 843

JO - Astrophysical Journal

JF - Astrophysical Journal

IS - 2

M1 - 148

ER -

Core or Cusps: The Central Dark Matter Profile of a Strong Lensing Cluster with a Bright Central Image at Redshift 1

Abstract

Funding

Keywords

Access to Document

Other files and links

Fingerprint

Cite this