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Data mining techniques must be developed and applied to analyse the large public data bases containing hundreds to thousands of millions entries. The aim of this study is to develop methods for locating previously unknown stellar clusters…

星系天体物理 · 物理学 2015-06-04 O. Solin , E. Ukkonen , L. Haikala

Mapping galaxies at low Galactic latitudes and determining their clustering status are fundamental steps in defining the large-scale structure in the nearby Universe. The VVV Near-IR Galaxy Catalogue (VVV NIRGC) allows us to explore this…

We study the radial total mass profiles of nine massive galaxy clusters ($M_\mathrm{200c}>5\times10^{14}$ M$_\odot$) in the redshift range $0.2 < z < 0.9$. These clusters were observed as part of the CLASH, HFF, BUFFALO, and CLASH-VLT…

宇宙学与河外天体物理 · 物理学 2025-06-25 Enrico Maraboli , Claudio Grillo , Pietro Bergamini , Carlo Giocoli

Thanks to its unrivalled sensitivity and large field of view, XMM potentially occupies a leading position as a survey instrument. We present cosmological arguments in favour of a medium-sensitivity, large-scale structure survey with XMM,…

天体物理学 · 物理学 2007-05-23 M. Pierre , I. Valtchanov , A. Refregier

(abridged) We present a study of the nature and evolution of large-scale structure based on two independent redshift surveys of faint field galaxies conducted with the 176-fiber Norris Spectrograph on the Palomar 200-inch telescope. The two…

天体物理学 · 物理学 2009-10-31 Todd Small , Chung-Pei Ma , Wallace Sargent , Donald Hamilton

The Fornax cluster is the nearest, large cluster in the southern sky, and is currently experiencing active assembly of mass. It is thus the target of a number of ongoing observing campaigns at optical, near-infrared and radio wavelengths,…

星系天体物理 · 物理学 2019-10-23 Natasha Maddox , Paolo Serra , Aku Venhola , Reynier Peletier , Ilani Loubser , Enrichetta Iodice

We present an optical group catalog between 0.1 < z < 1 based on 16,500 high-quality spectroscopic redshifts in the completed zCOSMOS-bright survey. The catalog published herein contains 1498 groups in total and 192 groups with more than…

We present a new cluster-finding algorithm based on a combination of the Voronoi Tessellation and Friends-Of-Friends methods. The algorithm utilises probability distribution functions derived from a photometric redshift analysis and is…

天体物理学 · 物理学 2007-05-23 Lee Clewley , Caroline van Breukelen , David Bonfield

Various aspects of cosmology require comprehensive all-sky mapping of the cosmic web to considerable depths. In order to probe the whole extragalactic sky beyond 100 Mpc, one must draw on multiwavelength datasets and state-of-the-art…

宇宙学与河外天体物理 · 物理学 2015-12-17 Maciej Bilicki

Galaxy pairs constitute the initial building blocks of galaxy evolution, which is driven through merger events and interactions. Thus, the analysis of these systems can be valuable in understanding galaxy evolution and studying structure…

The unprecedented sky coverage and photometric uniformity of the Two Micron All Sky Survey (2MASS) provides a rich resource for obtaining a detailed understanding of the galaxies populating our local (z<0.1) Universe. A full…

天体物理学 · 物理学 2007-05-23 Daniel H. McIntosh , Ari H. Maller , Neal Katz , Martin D. Weinberg

Context: Galaxy clusters at high redshift are important to test cosmological models and models for the growth of structure. They are difficult to find in wide-angle optical surveys, however, leaving dedicated follow-up of X-ray selected…

宇宙学与河外天体物理 · 物理学 2017-09-11 Andreas Rabitz , Georg Lamer , Axel Schwope , Ali Takey

Aims: According to some estimations, there are as many as 100000 open clusters in the Galaxy, but less than 2000 of them have been discovered, measured, and cataloged. We plan to undertake data mining of multiwavelength surveys to find new…

天体物理学 · 物理学 2009-11-13 S. E. Koposov , E. V. Glushkova , I. Yu. Zolotukhin

Context. The ZOA does not allow clear optical observations of extragalactic sources behind the Milky Way due to the meaningful extinction of the optical emission of these objects. The observations in NIR wavelengths represent a potential…

We suggest how we can use the mass profile of galaxy clusters beyond their virial radius to measure their mass accretion rate, a key prediction of structure formation models. The mass profile can be estimated by applying the caustic…

宇宙学与河外天体物理 · 物理学 2015-02-05 Antonaldo Diaferio

(abridged) High-z galaxy redshift surveys open up exciting possibilities for precision determinations of neutrino masses and inflationary models. The high-z surveys are more useful for cosmology than low-z ones owing to much weaker…

天体物理学 · 物理学 2009-11-13 Masahiro Takada , Eiichiro Komatsu , Toshifumi Futamase

We present an optically-selected cluster catalog from the Hyper Suprime-Cam (HSC) Subaru Strategic Program. The HSC images are sufficiently deep to detect cluster member galaxies down to $M_*\sim 10^{10.2}M_\odot$ even at $z\sim 1$,…

We present millimetre observations of a sample of 12 high redshift ultraluminous infrared galaxies (ULIRGs) in the Extended Growth Strip (EGS). These objects were initially selected on the basis of their observed mid--IR colours (0.0 <…

天体物理学 · 物理学 2009-11-13 J. D. Younger , A. Omont , N. Fiolet , J. -S. Huang , G. G. Fazio , K. Lai , M. Polletta , D. Rigopoulou , R. Zylka

We present deep I, J_s, K_s imaging and optical spectroscopy of the newly discovered Red-Sequence Cluster Survey cluster RCS043938-2904.9. This cluster, drawn from an extensive preliminary list, was selected for detailed study on the basis…