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Spatial Clustering of Galaxies in Large Datasets [article]

Alexander S. Szalay, Tamas Budavari, Andrew Connolly, Jim Gray, Takahiko Matsubara, Adrian Pope, Istvan Szapudi
2002 arXiv   pre-print
Datasets with tens of millions of galaxies present new challenges for the analysis of spatial clustering.  ...  A similar approach is used to compute the three-dimensional spatial clustering of galaxies on very large scales.  ...  ACKNOWLEDGEMENTS TM acknowledges support from the Ministry of Education, Culture, Sports, Science, and Technology, Grant-in-Aid for Encouragement of Young Scientists, 13740150, 2001.  ... 
arXiv:cs/0208015v1 fatcat:vigoolovh5bc3px46texoighue

Kinematics of the southern galaxy cluster Abell 3733

J. M. Solanes, P. Stein
1998 Astronomy and Astrophysics Supplement Series  
We assign cluster membership to 74 galaxies with heliocentric velocities in the interval 10500-13000 km/s.  ...  Spatial substructure tests do not find, however, any significant clumpiness in the plane of the sky, although the existence of subclustering along the line-of-sight cannot be excluded.  ...  P.S. acknowledges partial support from a research network grant by the Commission of the European Communities.  ... 
doi:10.1051/aas:1998263 fatcat:ikbp2enop5dmron2a3s3rl7ivu

The low-surface-brightness Universe: a new frontier in the study of galaxy evolution [article]

Sugata Kaviraj
2020 arXiv   pre-print
invisible in past wide-area datasets.  ...  New and forthcoming deep-wide surveys, from instruments like the HSC, LSST and EUCLID, are poised to revolutionize our understanding of galaxy evolution, by revealing aspects of galaxies that are largely  ...  I acknowledge generous financial support from the LOC/SOC and from the STFC for UK participation in LSST through grant ST/N002512/1.  ... 
arXiv:2001.01728v1 fatcat:2rtzkhhvsffknfx2t2xskggulq

Linking star formation and environment in supercluster galaxies

M. E. Gray, C. Wolf, K. Meisenheimer, A. Taylor, S. Dye, A. Borch, M. Kleinheinrich
2004 Proceedings of the International Astronomical Union  
We present a unique multiwavelength dataset of the Abell 901/902 supercluster at z = 0.16.  ...  In addition, we present a preliminary dynamical analysis of the spectroscopic sample (n ∼ 300 galaxies), revealing a bimodal distribution of galaxy velocities and significant substructure.  ...  The large number of large circles in the SW corner indicate a group that is distinct relative to the three main clusters both spatially and kinematically.  ... 
doi:10.1017/s1743921304000821 fatcat:c2e723uvjba6ta2eelg65mp5ea

Andromeda and the Milky Way: Twin sisters, distant relations, or strangers in the night?

A. McConnachie, J. Richardson, D. Mackey
2012 EPJ Web of Conferences  
I summarize some recent key results from the Pan-Andromeda Archaeological Survey (PAndAS), in particular showing how recent discoveries in and around M31 compare to the known structure of the Milky Way  ...  Spatial density distribution of globular clusters (red and blue dots for normal and extended clusters, respectively) compared to candidate red giant branch stars (for the dataset at the end of S09B).  ...  Lower panels show examples of the globular clusters in the dataset, and display a wide variety of sizes and luminosities.There is a clear correlation between the location of stellar substructures and the  ... 
doi:10.1051/epjconf/20121901003 fatcat:jmchgukc45gizguhq22ta7qnjy

The Angular Clustering of Distant Galaxy Clusters

Casey Papovich
2008 Astrophysical Journal  
Assuming the redshift distribution of these galaxy clusters follows a fiducial model, these galaxy clusters have a spatial-clustering scale length r_0 = 22.4 +/- 3.6 Mpc/h, and a comoving number density  ...  These candidate galaxy clusters show strong angular clustering, with an angular correlation function represented by w(theta) = (3.1 +/- 0.5) theta^(-1.1 +/- 0.1) with theta in units of arcminutes over  ...  The author thanks the SWIRE Legacy team for producing a highquality dataset, and the author thanks the Millennium collaboration for making their simulations available.  ... 
doi:10.1086/527665 fatcat:utew56jnafgxjeuwgilycyo4y4

A Time-independent Search for Neutrinos from Galaxy Clusters with IceCube [article]

Mehr Un Nisa, Andrew Ludwig
2021 arXiv   pre-print
Cosmic rays accelerated within the large-scale shocks,Active GalacticNuclei (AGN), or both can be confined in galaxy clusters over cosmological timescales and produce a steady flux of neutrinos in secondary  ...  We present the first results on the contribution of galaxy clusters to the diffuse neutrino flux and discuss the implications for various models of cosmic-ray acceleration in large-scale structures.  ...  Analysis Methods With the dataset of tracks and the catalog of galaxy clusters in hand, we perform a stacking search with an unbinned maximum-likelihood method.  ... 
arXiv:2107.10080v1 fatcat:yqdlrsqfxrbyho5le7ilfcikoi

Clustering-based redshift estimation: method and application to data [article]

Brice Ménard, Ryan Scranton, Samuel Schmidt, Chris Morrison, Donghui Jeong, Tamas Budavari, Mubdi Rahman
2014 arXiv   pre-print
Our approach advocates the use of clustering measurements on all available scales, in contrast to previous works focusing only on linear scales.  ...  This technique brings valuable information on the third dimension of astronomical datasets. It is widely applicable to a large range of extra-galactic surveys.  ...  information extracted from spatial clustering.  ... 
arXiv:1303.4722v2 fatcat:l3oy5hd62zdhhc7txu2x4f6wcy

Does the Corona Borealis Supercluster form a giant binary-like system?

Giovanni C. Baiesi Pillastrini
2016 Astrophysics and Space Science  
Mapping such a distribution as a function of spatial positions, the deepest potential wells in the sample trace unambiguously the locations of the densest galaxy cluster clumps providing the physical keys  ...  The distribution of local gravitational potentials generated by a complete volume-limited sample of galaxy groups and clusters filling the Corona Borealis region has been derived to search for new gravitational  ...  In other words, the more accurate the mass estimates (as well as the spatial position of the tracers in real space) of the dataset, the more reliable the clustering analysis will be.  ... 
doi:10.1007/s10509-016-2762-8 fatcat:o63yb4h5yvhnlp74oxbbs6qp3u

X-ray Cluster Cosmology [article]

A. Vikhlinin, M. Paolillo , M. Donahue, S. Borgani, G. Pareschi INAF-Osservatorio Astronomico di Bologna INAF-Osservatorio Astronomico di Trieste INAF-Osservatorio Astronomico di Brera, University of Michigan
2009 arXiv   pre-print
Uniquely, WFXT will be able not only to detect clusters but also to make detailed X-ray measurements for a large number of clusters and groups right from the survey data.  ...  Very high quality measurements of the cluster mass function and spatial correlation over a very wide range of masses, spatial scales, and redshifts, will be useful for expanding the cosmological discovery  ...  Traditional cluster cosmology with WFXT A wide WFXT survey will provide a rich dataset for classical cosmological tests using clusters of galaxies.  ... 
arXiv:0903.5320v1 fatcat:slmiqfjetbawreaty3jqzw6mcm

Projection, Spatial Correlations, and Anisotropies in a Large and Complete Sample of Abell Clusters

Christopher J. Miller, David J. Batuski, Kurt A. Slinglend, John M. Hill
1999 Astrophysical Journal  
We show that the strong anisotropies present in previously studied Abell cluster datasets are not present in our R >= 1 samples.  ...  We also remove a subset of R = 1 Abell/ACO clusters that show sizable foreground/background galaxy contamination and again find no change in the amplitude or slope of the correlation function.  ...  This research has made use of the NASA/IPAC Extragalactic Database (NED), which is operated by the Jet Propulsion Laboratory, California Institute of Technology, under contract with the National Aeronautics  ... 
doi:10.1086/307748 fatcat:v6epfsu66nhw3pujkp3l5h4hvy

CLASH-VLT: Substructure in the galaxy cluster MACS J1206.2-0847 from kinematics of galaxy populations [article]

M. Girardi, A. Mercurio, I. Balestra, M. Nonino, A. Biviano, C. Grillo, P. Rosati, M. Annunziatella, R. Demarco, A. Fritz, R. Gobat, D. Lemze (+24 others)
2015 arXiv   pre-print
Our analysis is mainly based on an extensive spectroscopic dataset of 445 member galaxies, mostly acquired with VIMOS@VLT as part of our ESO Large Programme, sampling the cluster out to a radius ~2R200  ...  through the spectrophotometric properties of a large number of galaxies from the CLASH-VLT survey.  ...  The research is based in part on data collected at Subaru Telescope, which is operated by the National Astronomical Observatory of Japan, and obtained from the SMOKA, which is operated by the Astronomy  ... 
arXiv:1503.05607v2 fatcat:sefu6gkzcjdfhcsw3eu4pddpwy

Page 9 of Astronomy and Astrophysics Vol. 310, Issue 1 [page]

1996 Astronomy and Astrophysics  
More importantly: it is the largest homogeneous dataset of redshifts of galaxies in clusters.  ...  Introduction Rich clusters of galaxies have long been recognized as objects that can provide information about important aspects of the physics of large-scale structure formation.  ... 

LARGE-SCALE FILAMENTARY STRUCTURES AROUND THE VIRGO CLUSTER REVISITED

Suk Kim, Soo-Chang Rey, Martin Bureau, Hyein Yoon, Aeree Chung, Helmut Jerjen, Thorsten Lisker, Hyunjin Jeong, Eon-Chang Sung, Youngdae Lee, Woong Lee, Jiwon Chung
2016 Astrophysical Journal  
In particular, this includes a large number of low-luminosity galaxies, resulting in better sampled individual structures.  ...  We revisit the filamentary structures of galaxies around the Virgo cluster, exploiting a larger dataset based on the HyperLeda database than previous studies.  ...  The primary goal of our study is thus to revisit the large-scale structures in the vicinity of the Virgo cluster using an upto-date statistically robust dataset, to test whether the T82 structures can  ... 
doi:10.3847/1538-4357/833/2/207 fatcat:hc6aytrv2jb5fgw43yelux4cju

A Fast and Simple Algorithm for Detecting Large Scale Structures [article]

Giovanni C. Baiesi Pillastrini
2013 arXiv   pre-print
for analyzing large datasets.  ...  Results: using a complete volume-limited sample of galaxy clusters, a huge concentration of galaxy clusters has been detected.  ...  from large datasets.  ... 
arXiv:1306.6791v2 fatcat:gu6ex5l6offohmyaq63um7vnum
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