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We present new results on the "dark flow" from a measurement of the dipole in the distribution of peculiar velocities of galaxy clusters, applying the methodology proposed and developed by us earlier. Our latest measurement is conducted…

Cosmology and Nongalactic Astrophysics · Physics 2015-05-20 A. Kashlinsky , F. Atrio-Barandela , H. Ebeling

We investigate the use of simple colour cuts applied to the SDSS optical imaging to perform photometric selections of emission line galaxies out to z<1. From colour-cuts using the SDSS g, r and i bands, we obtain mean photometric redshifts…

Cosmology and Nongalactic Astrophysics · Physics 2015-05-13 Rich Bielby , T. Shanks , U. Sawangwit , S. M. Croom , Nicholas P. Ross , D. A. Wake

[abridged] We present the analysis of the spectroscopic and photometric catalogues of 11 X-ray luminous clusters at z=0.07-0.16 from the Las Campanas / Anglo-Australian Telescope Rich Cluster Survey. Our spectroscopic dataset consists of…

Hot gas trapped in a dark matter halo will produce a decrement in the surface brightness of the microwave background, the Sunyaev-Zel'dovich (SZ) effect. While massive clusters produce the strongest central SZ decrements, we point out that…

Astrophysics · Physics 2009-11-07 James E. Taylor , Kavilan Moodley , J. M. Diego

Surveys based on the Sunyaev-Zel'dovich (SZ) effect provide a fresh view of the galaxy cluster population, one that is complementary to X-ray surveys. To better understand the relation between these two kinds of survey, we construct an…

Cosmology and Nongalactic Astrophysics · Physics 2017-03-15 A. Chamballu , J. G. Bartlett , J. -B. Melin

We determine the relation between the Comptonization parameter predicted using X-ray data $Y_{C,Xray}$ and the X-ray luminosity $L_X$, both magnitudes derived from ROSAT data, with the Comptonization parameter $Y_{C,SZ}$ measured on {\it…

Cosmology and Nongalactic Astrophysics · Physics 2016-07-26 I. De Martino , F. Atrio-Barandela

Using both halo model calculations and a large sample of simulated SZ maps, we demonstrate that high-mass clusters add significant non-Gaussian variance to measurements of the SZ power spectrum amplitude. The difficulty in correctly…

Cosmology and Nongalactic Astrophysics · Physics 2009-08-17 L. D. Shaw , O. Zahn , G. P. Holder , O. Doré

Context. The large-scale mass distribution around dark matter haloes hosting galaxy clusters provides sensitive cosmological information. Aims. In this work, we make use of a large photometric galaxy cluster sample, constructed from the…

We present a 200 ksec Chandra observation of seven spectroscopically selected, high redshift (0.75 < z < 1.03) galaxy groups and clusters discovered by the DEEP2 Galaxy Redshift Survey in the Extended Groth Strip (EGS). X-ray emission at…

Astrophysics · Physics 2009-11-11 T. Fang , B. Gerke , D. Davis , J. Newman , M. Davis , K. Nandra , E. Laird , D. Koo , A. Coil , M. Cooper , D. Croton , R. Yan

We derive cosmological constraints using a galaxy cluster sample selected from the 2500~deg$^2$ SPT-SZ survey. The sample spans the redshift range $0.25< z<1.75$ and contains 343 clusters with SZ detection significance $\xi>5$. The sample…

The South Pole Telescope (SPT) is conducting a Sunyaev-Zel'dovich (SZ) effect survey over large areas of the southern sky, searching for massive galaxy clusters to high redshift. In this preliminary study, we focus on a 40 square-degree…

The spectrum of the radio halo in the Coma cluster is measured over almost two decades in frequency. The current radio data show a steepening of the spectrum at higher frequencies, which has implications for models of the radio halo origin.…

Cosmology and Nongalactic Astrophysics · Physics 2015-06-17 G. Brunetti , L. Rudnick , R. Cassano , P. Mazzotta , J. Donnert , K. Dolag

An analysis of R >= 1 Abell clusters is presented for samples containing recent redshifts from the MX Northern Abell Cluster Survey. The newly obtained redshifts from the MX Survey as well as those from the ESO Nearby Abell Cluster Survey…

Astrophysics · Physics 2009-10-31 C. J. Miller , D. J. Batuski , K. A. Slinglend , J. M. Hill

We derive radial mass profiles of four strong lensing selected clusters which show prominent giant arcs (Abell 1703, SDSS J1446+3032, SDSS J1531+3414, and SDSS J2111-0115), by combining detailed strong lens modeling with weak lensing shear…

We report cosmic microwave background (CMB) power spectrum measurements from the first 100 sq. deg. field observed by the South Pole Telescope (SPT) at 150 and 220 GHz. On angular scales where the primary CMB anisotropy is dominant, ell ~<…