TY - JOUR
T1 - Cosmic web reconstruction through density ridges
T2 - Catalogue
AU - Chen, Yen Chi
AU - Ho, Shirley
AU - Brinkmann, Jon
AU - Freeman, Peter E.
AU - Genovese, Christopher R.
AU - Schneider, Donald P.
AU - Wasserman, Larry
N1 - Funding Information:
We thank Hung-Jin Huang, Rachel Mandelbaum, Michael Strauss,and Hy Trac for useful discussions and comments. We also thankShadab Alam and Martin White for providing the N-body simulationhalo catalogues. This work is supported in part by the Departmentof Energy under grant DESC0011114; YC is supported byWilliam S.Dietrich II Presidential PhD Fellowship; SH is supportedin part by DOE-ASC, NASA and NSF; CG is supported in part byDOE and NSF; LW is supported by NSF. Funding for SDSS-IIIhas been provided by the Alfred P. Sloan Foundation, the ParticipatingInstitutions, the National Science Foundation, and the U.S.Department of Energy Office of Science. The SDSS-III website ishttp://www.sdss3.org/.SDSS-III is managed by the Astrophysical Research Consortiumfor the Participating Institutions of the SDSS-III Collaborationincluding the University of Arizona, the Brazilian ParticipationGroup, Brookhaven National Laboratory, Carnegie Mellon University,University of Florida, the French Participation Group, theGerman Participation Group, Harvard University, the Instituto deAstrofisica de Canarias, the Michigan State/Notre Dame/JINA ParticipationGroup, Johns Hopkins University, Lawrence BerkeleyNational Laboratory, Max Planck Institute for Astrophysics, MaxPlanck Institute for Extraterrestrial Physics, NewMexico State University,New York University, Ohio State University, PennsylvaniaState University, University of Portsmouth, Princeton University,the Spanish Participation Group, University of Tokyo, Universityof Utah, Vanderbilt University, University of Virginia, Universityof Washington, and Yale University.
Publisher Copyright:
© 2016 The Authors.
PY - 2016/10/1
Y1 - 2016/10/1
N2 - We construct a catalogue for filaments using a novel approach called SCMS (subspace constrainedmean shift). SCMS is a gradient-based method that detects filaments through densityridges (smooth curves tracing high-density regions). A great advantage of SCMS is its uncertaintymeasure, which allows an evaluation of the errors for the detected filaments. Todetect filaments, we use data from the Sloan Digital Sky Survey, which consist of three galaxysamples: the NYU main galaxy sample (MGS), the LOWZ sample and the CMASS sample.Each of the three data set covers different redshift regions so that the combined sample allowsdetection of filaments up to z = 0.7. Our filament catalogue consists of a sequence of twodimensionalfilament maps at different redshifts that provide several useful statistics on theevolution cosmic web. To construct the maps, we select spectroscopically confirmed galaxieswithin 0.050 < z < 0.700 and partition them into 130 bins. For each bin, we ignore the redshift,treating the galaxy observations as a 2-D data and detect filaments using SCMS. The filamentcatalogue consists of 130 individual 2-D filament maps, and each map comprises points onthe detected filaments that describe the filamentary structures at a particular redshift. We alsoapply our filament catalogue to investigate galaxy luminosity and its relation with distance tofilament. Using a volume-limited sample, we find strong evidence (6.1σ-12.3σ) that galaxiesclose to filaments are generally brighter than those at significant distance from filaments.
AB - We construct a catalogue for filaments using a novel approach called SCMS (subspace constrainedmean shift). SCMS is a gradient-based method that detects filaments through densityridges (smooth curves tracing high-density regions). A great advantage of SCMS is its uncertaintymeasure, which allows an evaluation of the errors for the detected filaments. Todetect filaments, we use data from the Sloan Digital Sky Survey, which consist of three galaxysamples: the NYU main galaxy sample (MGS), the LOWZ sample and the CMASS sample.Each of the three data set covers different redshift regions so that the combined sample allowsdetection of filaments up to z = 0.7. Our filament catalogue consists of a sequence of twodimensionalfilament maps at different redshifts that provide several useful statistics on theevolution cosmic web. To construct the maps, we select spectroscopically confirmed galaxieswithin 0.050 < z < 0.700 and partition them into 130 bins. For each bin, we ignore the redshift,treating the galaxy observations as a 2-D data and detect filaments using SCMS. The filamentcatalogue consists of 130 individual 2-D filament maps, and each map comprises points onthe detected filaments that describe the filamentary structures at a particular redshift. We alsoapply our filament catalogue to investigate galaxy luminosity and its relation with distance tofilament. Using a volume-limited sample, we find strong evidence (6.1σ-12.3σ) that galaxiesclose to filaments are generally brighter than those at significant distance from filaments.
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U2 - 10.1093/mnras/stw1554
DO - 10.1093/mnras/stw1554
M3 - Article
AN - SCOPUS:84988603299
VL - 461
SP - 3896
EP - 3909
JO - Monthly Notices of the Royal Astronomical Society
JF - Monthly Notices of the Royal Astronomical Society
SN - 0035-8711
IS - 4
ER -