TY - JOUR
T1 - Subaru weak lensing measurement of a z = 0.81 cluster discovered by the Atacama Cosmology Telescope Survey
AU - Miyatake, Hironao
AU - Nishizawa, Atsushi J.
AU - Takada, Masahiro
AU - Mandelbaum, Rachel
AU - Mineo, Sogo
AU - Aihara, Hiroaki
AU - Spergel, David N.
AU - Bickerton, Steven J.
AU - Bond, J. Richard
AU - Gralla, Megan
AU - Hajian, Amir
AU - Hilton, Matt
AU - Hincks, Adam D.
AU - Hughes, John P.
AU - Infante, Leopoldo
AU - Lin, Yen Ting
AU - Lupton, Robert H.
AU - Marriage, Tobias A.
AU - Marsden, Danica
AU - Menanteau, Felipe
AU - Miyazaki, Satoshi
AU - Moodley, Kavilan
AU - Niemack, Michael D.
AU - Oguri, Masamune
AU - Price, Paul A.
AU - Reese, Erik D.
AU - Sifón, Cristóbal
AU - Wollack, Edward J.
AU - Yasuda, Naoki
PY - 2013/3/11
Y1 - 2013/3/11
N2 - We present a Subaru weak lensing measurement ofACT-CL J0022.2-0036, one of themost luminous, high-redshift (z = 0.81) Sunyaev-Zel'dovich (SZ) clusters discovered in the 268 deg2 equatorial region survey of the Atacama Cosmology Telescope that overlaps with Sloan Digital Sky Survey (SDSS) Stripe 82 field. Ours is the first weak lensing study with Subaru at such high redshifts. For the weak lensing analysis using i'-band images, we use a model-fitting (Gauss-Laguerre shapelet) method to measure shapes of galaxy images, where we fit galaxy images in different exposures simultaneously to obtain best-fitting ellipticities taking into account the different point spread functions (PSFs) in each exposure. We also take into account the astrometric distortion effect on galaxy images by performing the model fitting in the world coordinate system. To select background galaxies behind the cluster at z = 0.81, we use photometric redshift estimates for every galaxy derived from the co-added images of multi-passband Br'i'z'Y, with PSF matching/homogenization. After a photometric redshift cut for background galaxy selection, we detect the tangential weak lensing distortion signal with a total signal-tonoise ratio of about 3.7. By fitting a Navarro-Frenk-White model to the measured shear profile,we find the cluster mass to be M200-ρm = [7.5-2.8+3.2(stat.)-0.6+1.3(sys.)]×1014M⊙ h-1. The weak lensing-derived mass is consistent with previous mass estimates based on the SZ observation, with assumptions of hydrostatic equilibrium and virial theorem, as well as with scaling relations between SZ signal and mass derived from weak lensing, X-ray and velocity dispersion, within the measurement errors. We also show that the existence of ACT-CL J0022.2-0036 at z = 0.81 is consistent with the cluster abundance prediction of the Λ-dominated cold dark matter structure formation model. We thus demonstrate the capability of Subaru-type ground-based images for studying weak lensing of high-redshift clusters.
AB - We present a Subaru weak lensing measurement ofACT-CL J0022.2-0036, one of themost luminous, high-redshift (z = 0.81) Sunyaev-Zel'dovich (SZ) clusters discovered in the 268 deg2 equatorial region survey of the Atacama Cosmology Telescope that overlaps with Sloan Digital Sky Survey (SDSS) Stripe 82 field. Ours is the first weak lensing study with Subaru at such high redshifts. For the weak lensing analysis using i'-band images, we use a model-fitting (Gauss-Laguerre shapelet) method to measure shapes of galaxy images, where we fit galaxy images in different exposures simultaneously to obtain best-fitting ellipticities taking into account the different point spread functions (PSFs) in each exposure. We also take into account the astrometric distortion effect on galaxy images by performing the model fitting in the world coordinate system. To select background galaxies behind the cluster at z = 0.81, we use photometric redshift estimates for every galaxy derived from the co-added images of multi-passband Br'i'z'Y, with PSF matching/homogenization. After a photometric redshift cut for background galaxy selection, we detect the tangential weak lensing distortion signal with a total signal-tonoise ratio of about 3.7. By fitting a Navarro-Frenk-White model to the measured shear profile,we find the cluster mass to be M200-ρm = [7.5-2.8+3.2(stat.)-0.6+1.3(sys.)]×1014M⊙ h-1. The weak lensing-derived mass is consistent with previous mass estimates based on the SZ observation, with assumptions of hydrostatic equilibrium and virial theorem, as well as with scaling relations between SZ signal and mass derived from weak lensing, X-ray and velocity dispersion, within the measurement errors. We also show that the existence of ACT-CL J0022.2-0036 at z = 0.81 is consistent with the cluster abundance prediction of the Λ-dominated cold dark matter structure formation model. We thus demonstrate the capability of Subaru-type ground-based images for studying weak lensing of high-redshift clusters.
KW - Cosmology: observation
KW - Galaxies: clusters: individual: ACT-CL J0022.2-0036
KW - Gravitational lensing: weak
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U2 - 10.1093/mnras/sts643
DO - 10.1093/mnras/sts643
M3 - Article
AN - SCOPUS:84874160031
SN - 0035-8711
VL - 429
SP - 3627
EP - 3644
JO - Monthly Notices of the Royal Astronomical Society
JF - Monthly Notices of the Royal Astronomical Society
IS - 4
ER -