Site Map
Follow us on Facebook Follow us on Twitter YouTube channel
Centro de Astrofísica da Universidade do Porto

The RedMaPPer Galaxy Cluster Catalog From DES Science Verification Data

E. S. Rykoff, E. Rozo, D. Hollowood, A Bermeo-Hernandez, T. Jeltema, J. A. Mayers, A. K. Romer, P. J. Rooney, A. Saro, C. V. Cervantes, R. H. Wechsler, H. Wilcox, T. M. C. Abbott, F. B. Abdalla, S. S. Allam, J. Annis, A. Benoit-Levy, G. M. Bernstein, E. Bertin, D. H. Brooks, D. L. Burke, D. Capozzi, A. C. Rosell, M. C. Kind, F. J. Castander, M. Childress, C. A. Collins, C. E. Cunha, D'Andrea,C. B., L. da Costa, T. M. Davis, S. Desai, H. T. Diehl, J. P. Dietrich, P. Doel, A. E. Evrard, D. A. Finley, B. Flaugher, P. Fosalba, J. A. Frieman, K. Glazebrook, D. A. Goldstein, D. Gruen, R. A. Gruendl, G. Gutierrez, M. Hilton, K. Honscheid, B. Hoyle, D. James, S. T. Kay, K. Kuehn, N. Kuropatkin, O. Lahav, G. F. Lewis, C. Lidman, M. Lima, M. A. G. Maia, R. Mann, J. L. Marshall, P. Martini, P. Melchior, C. J. Miller, R. Miquel, J. J. Mohr, R. C. Nichol, B. Nord, R. Ogando, A. A. Plazas, K Reil, M. Sahlén, E. Sanchez, B. Santiago, V. Scarpine, M. Schubnell, I. Sevilla-Noarbe, R. C. Smith, M. Soares-Santos, F. Sobreira, J. P. Stott, E. Suchyta, M. E. C. Swanson, G. Tarle, D. Thomas, D. L. Tucker, S. Uddin, P. T. P. Viana, V. Vikram, A. R. Walker, Y.-Y. Zhang

We describe updates to the redMaPPer algorithm, a photometric red-sequence cluster finder specifically designed for large photometric surveys. The updated algorithm is applied to 150 {{deg}}2 of Science Verification (SV) data from the Dark Energy Survey (DES), and to the Sloan Digital Sky Survey (SDSS) DR8 photometric data set. The DES SV catalog is locally volume limited and contains 786 clusters with richness λ gt 20 (roughly equivalent to {M}{{500c}}≳ {10}14 {h}70-1 {M}) and 0.2lt zlt 0.9. The DR8 catalog consists of 26,311 clusters with 0.08lt zlt 0.6, with a sharply increasing richness threshold as a function of redshift for z≳ 0.35. The photometric redshift performance of both catalogs is shown to be excellent, with photometric redshift uncertainties controlled at the {σ }z/(1+z)˜ 0.01 level for z≲ 0.7, rising to ˜0.02 at z˜ 0.9 in DES SV. We make use of Chandra and XMM X-ray and South Pole Telescope Sunyaev-Zeldovich data to show that the centering performance and mass-richness scatter are consistent with expectations based on prior runs of redMaPPer on SDSS data. We also show how the redMaPPer photo-z and richness estimates are relatively insensitive to imperfect star/galaxy separation and small-scale star masks.

galaxies: clusters: general

The Astrophysical Journal Supplement Series
Volume 224
April 2016

>> PDF>> ADS>> DOI

Institute of Astrophysics and Space Sciences

Institute of Astrophysics and Space Sciences (IA) is a new but long anticipated research infrastructure with a national dimension. It embodies a bold but feasible vision for the development of Astronomy, Astrophysics and Space Sciences in Portugal, taking full advantage and fully realizing the potential created by the national membership of the European Space Agency (ESA) and the European Southern Observatory (ESO). IA resulted from the merging the two most prominent research units in the field in Portugal: the Centre for Astrophysics of the University of Porto (CAUP) and the Center for Astronomy and Astrophysics of the University of Lisbon (CAAUL). It currently hosts more than two-thirds of all active researchers working in Space Sciences in Portugal, and is responsible for an even greater fraction of the national productivity in international ISI journals in the area of Space Sciences. This is the scientific area with the highest relative impact factor (1.65 times above the international average) and the field with the highest average number of citations per article for Portugal.

Proceed on CAUP's website|Go to IA website