Browsing by Author "Miyatake, Hironao"

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    Subaru weak lensing measurement of a z=0.81 cluster discovered by the Atacama Cosmology Telescope Survey
    (2013) Miyatake, Hironao; Nishizawa, Atsushi J.; Takada, Masahiro; Mandelbaum, Rachel; Mineo, Sogo; Aihara, Hiroaki; Spergel, David N.; Bickerton, Steven J.; Bond, J. Richard; Gralla, Megan; Hajian, Amir; Hilton, Matt; Hincks, Adam D.; Hughes, John P.; Infante, Leopoldo; Lin, Yen-Ting; Lupton, Robert H.; Marriage, Tobias A.; Marsden, Danica; Menanteau, Felipe; Miyazaki, Satoshi; Moodley, Kavilan; Niemack, Michael D.; Oguri, Masamune; Price, Paul A.; Reese, Erik D.; Sifon, Cristobal; Wollack, Edward J.; Yasuda, Naoki
    We present a Subaru weak lensing measurement of ACT-CL J0022.2-0036, one of the most luminous, high-redshift (z = 0.81) Sunyaev-Zel'dovich (SZ) clusters discovered in the 268 deg(2) 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-to-noise ratio of about 3.7. By fitting a Navarro-Frenk-White model to the measured shear profile, we find the cluster mass to be M-200 (rho) over barm = [7.5(-2.8)(+3.2)(stat.)(+1.3)(-0.6)(sys.)] x 10(14) M-circle dot 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 Lambda-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.
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    Weak-lensing Mass Calibration of ACTPol Sunyaev-Zel'dovich Clusters with the Hyper Suprime-Cam Survey
    (2019) Miyatake, Hironao; Battaglia, Nicholas; Hilton, Matt; Medezinski, Elinor; Nishizawa, Atsushi J.; More, Surhud; Aiola, Simone; Bahcall, Neta; Bond, J. Richard; Calabrese, Erminia; Choi, Steve K.; Devlin, Mark J.; Dunkley, Joanna; Dunner, Rolando; Fuzia, Brittany; Gallardo, Patricio; Gralla, Megan; Hasselfield, Matthew; Halpern, Mark; Hikage, Chiaki; Hill, J. Colin; Hincks, Adam D.; Hlozek, Renee; Huffenberger, Kevin; Hughes, John P.; Koopman, Brian; Kosowsky, Arthur; Louis, Thibaut; Madhavacheril, Mathew S.; McMahon, Jeff; Mandelbaum, Rachel; Marriage, Tobias A.; Maurin, Loic; Miyazaki, Satoshi; Moodley, Kavilan; Murata, Ryoma; Naess, Sigurd; Newburgh, Laura; Niemack, Michael D.; Nishimichi, Takahiro; Okabe, Nobuhiro; Oguri, Masamune; Osato, Ken; Page, Lyman; Partridges, Bruce; Robertson, Naomi; Sehgal, Neelima; Sherwin, Blake; Shirasaki, Masato; Sievers, Jonathan; Sifon, Cristobal; Simon, Sara; Spergel, David N.; Staggs, Suzanne T.; Stein, George; Takada, Masahiro; Trac, Hy; Umetsu, Keiichi; van Engelenl, Alex; Wollack, Edward J.
    We present weak-lensing measurements using the first-year data from the Hyper Suprime-Cam Strategic Survey Program on the Subaru telescope for eight galaxy clusters selected through their thermal Sunyaev-Zel'dovich (SZ) signal measured at 148 GHz with the Atacama Cosmology Telescope Polarimeter experiment. The overlap between the two surveys in this work is 33.8 square degrees, before masking bright stars. The signal-to-noise ratio of individual cluster lensing measurements ranges from 2.2 to 8.7, with a total of 11.1 for the stacked cluster weak-lensing signal. We fit for an average weak-lensing mass distribution using three different profiles, a Navarro-Frenk-White profile, a dark-matter-only emulated profile, and a full cosmological hydrodynamic emulated profile. We interpret the differences among the masses inferred by these models as a systematic error of 10%, which is currently smaller than the statistical error. We obtain the ratio of the SZ-estimated mass to the lensing-estimated mass (the so-called hydrostatic mass bias 1-b) of 0.74(-0.12)(+0.13), which is comparable to previous SZ-selected clusters from the Atacama Cosmology Telescope and from the Planck Satellite. We conclude with a discussion of the implications for cosmological parameters inferred from cluster abundances compared to cosmic microwave background primary anisotropy measurements.