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SubmittedOpen Access (License Unspecified), Open
Journal article
Two-Dimensional Topology of the Sloan Digital Sky Survey
The Astrophysical journal, v 580(2 I), pp 663-671
10 Jun 2002
Abstract
Astrophys.J.580:663-671,2002 We present the topology of a volume-limited sample of 11,884 galaxies,
selected from an apparent-magnitude limited sample of over 100,000 galaxies
observed as part of the Sloan Digital Sky Survey (SDSS). The data currently
cover three main regions on the sky: one in the Galactic north and one in the
south, both at zero degrees declination, and one area in the north at higher
declination. Each of these areas covers a wide range of survey longitude but a
narrow range of survey latitude, allowing the two dimensional genus to be
measured.
The genus curves of the SDSS sub-samples are similar, after appropriately
normalizing these measurements for the different areas. We sum the genus curves
from the three areas to obtain the total genus curve of the SDSS. The total
curve has a shape similar to the genus curve derived from mock catalogs drawn
from the Hubble Volume Lambda CDM simulation and is similar to that of a
Gaussian random field. Likewise, comparison with the genus of the 2dFGRS, after
normalization for the difference in area, reveals remarkable similarity in the
topology of these samples.
We test for the effects of galaxy type segregation by splitting the SDSS data
into thirds, based on the u^*- r^* colors of the galaxies, and measure the
genus of the reddest and bluest sub-samples. This red/blue split in u^*- r^* is
essentially a split by morphology (Strateva et al. 2001). We find that the
genus curve for the reddest galaxies exhibits a ``meatball'' shift of the
topology -- reflecting the concentration of red galaxies in high density
regions -- compared to the bluest galaxies and the full sample, in agreement
with predictions from simulations.
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Details
- Title
- Two-Dimensional Topology of the Sloan Digital Sky Survey
- Creators
- Fiona Hoyle - Drexel UniversityMichael S Vogeley - Drexel UniversityJ. Richard GottIII - PrincetonMichael Blanton - New York UniversityMax Tegmark - University of PennsylvaniaDavid H Weinberg - The Ohio State UniversityJon Brinkmann - Apache CorporationNeta A Bahcall - Princeton UniversityDonald G York - University of Chicagofor the SdssSDSS Collaboration
- Publication Details
- The Astrophysical journal, v 580(2 I), pp 663-671
- Resource Type
- Journal article
- Language
- English
- Academic Unit
- Physics
- Web of Science ID
- WOS:000179458300004
- Scopus ID
- 2-s2.0-0037740189
- Other Identifier
- 991019168252104721
InCites Highlights
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- Collaboration types
- Domestic collaboration
- Web of Science research areas
- Astronomy & Astrophysics