Galaxy Groups in the Third Data Release of the Sloan Digital Sky Survey

Merchán, Manuel; Zandivarez, Ariel

doi:10.1086/427989

Cited by 115 publications

(151 citation statements)

References 18 publications

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“…The former benefit from much finer spatial resolution along the line of sight. They tend to be shallow, with typical z 0.2 (Merchán and Zandivarez, 2002;Kochanek et al, 2003;Miller et al, 2005;Merchán and Zandivarez, 2005;Berlind et al, 2006;Yang et al, 2007;Li and Yee, 2008;Blackburne and Kochanek, 2012), though high redshift spectroscopic catalogs do exist (Gerke et al, 2005;Coil et al, 2006). Photometric cluster catalogs hail back as far as the original Abell (1958) catalog, which contained upwards of 2500 systems and served as the primary basis of cluster studies for decades.…”

Section: The Current State Of Playmentioning

confidence: 99%

Observational probes of cosmic acceleration

et al. 2013

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The accelerating expansion of the universe is the most surprising cosmological discovery in many decades, implying that the universe is dominated by some form of "dark energy" with exotic physical properties, or that Einstein's theory of gravity breaks down on cosmological scales. The profound implications of cosmic acceleration have inspired ambitious efforts to understand its origin, with experiments that aim to measure the history of expansion and growth of structure with percent-level precision or higher. We review in detail the four most well established methods for making such measurements: Type Ia supernovae, baryon acoustic oscillations (BAO), weak gravitational lensing, and the abundance of galaxy clusters. We pay particular attention to the systematic uncertainties in these techniques and to strategies for controlling them at the level needed to exploit "Stage IV" dark energy facilities such as BigBOSS, LSST, Euclid, and WFIRST. We briefly review a number of other approaches including redshift-space distortions, the Alcock-Paczynski effect, and direct measurements of the Hubble constant H 0 . We present extensive forecasts for constraints on the dark energy equation of state and parameterized deviations from General Relativity, achievable with Stage III and Stage IV experimental programs that incorporate supernovae, BAO, weak lensing, and cosmic microwave background data. We also show the level of precision required for clusters or other methods to provide constraints competitive with those of these fiducial programs. We emphasize the value of a balanced program that employs several of the most powerful methods in combination, both to cross-check systematic uncertainties and to take advantage of complementary information. Surveys to probe cosmic acceleration produce data sets that support a wide range of scientific investigations, and they continue the longstanding astronomical tradition of mapping the universe in ever greater detail over ever larger scales.

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Section: The Current State Of Playmentioning

confidence: 99%

Observational probes of cosmic acceleration

et al. 2013

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“…During the last decade, several group catalogues that use spectroscopic redshifts have been published, either based on the 2dFGRS (Eke et al 2004;Yang et al 2005;Tago et al 2006), or on earlier releases of the SDSS (Einasto et al 2003;Merchán & Zandivarez 2005;Zandivarez et al 2006;Berlind et al 2006;Berlind & SDSS 2009;Yang et al 2007;Koester et al 2007). However, similar algorithms used to compile these catalogues have yielded groups of galaxies with rather different statistical properties.…”

Section: Introductionmentioning

confidence: 99%

Groups and clusters of galaxies in the SDSS DR8

Tempel

Tago

Liivamägi

2012

A&A

132

195

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Aims. We intend to compile a new galaxy group and cluster sample of the latest available SDSS data, adding several parameter for the purpose of studying the supercluster network, galaxy and group evolution, and their connection to the surrounding environment. Methods. We used a modified friends-of-friends (FoF) method with a variable linking length in the transverse and radial directions to eliminate selection effects and to find reliably as many groups as possible. Using the galaxies as a basis, we calculated the luminosity density field. Results. We create a new catalogue of groups and clusters for the SDSS data release 8 sample. We find and add environmental parameters to our catalogue, together with other galaxy parameters (e.g., morphology), missing from our previous catalogues. We take into account various selection effects caused by a magnitude limited galaxy sample. Our final sample contains 576 493 galaxies and 77 858 groups.

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“…The next generation of galaxy group catalogues started from the Las Campanas catalogue of groups by Tucker et al (2000) and was followed by the catalogues based on the 2 degree Field Galaxy Redshift Survey (2dFGRS) data releases (Colless et al 2001(Colless et al , 2003 and the Sloan Digital Sky Survey (SDSS) data releases (Early Data Release, Data Release 1-Data Release 7) (Adelman-McCarthy et al 2008). As one of several important results more search algorithms were developed (De Propris et al 2002;Goto et al 2002;Merchán & Zandivarez 2002;Bahcall et al 2003;Lee et al 2004;Eke et al 2004;Merchán & Zandivarez 2005;Yang et al 2005;Einasto et al 2005;Weinmann et al 2006; Full Table 2 is only available in electronic form at the CDS via anonymous ftp to cdsarc.u-strasbg.fr (130.79.128.5) or via http://cdsweb.u-strasbg.fr/cgi-bin/qcat?J/A+A/514/A102 Tago et al 2006;Berlind et al 2006;Deng et al 2007;Yang et al 2007;Tago et al 2008).…”

Section: Introductionmentioning

confidence: 99%

“…Using earlier releases of the SDSS, preliminary catalogues of groups have been obtained (Einasto et al 2003a; Lee et al 2004;Merchán & Zandivarez 2005;Goto 2005;Yang et al 2005;Weinmann et al 2006;Zandivarez et al 2006;Berlind et al 2006;Yang et al 2007). However, similar algorithms used to compile these catalogues yielded groups of galaxies with rather different statistical properties.…”

Section: Introductionmentioning

confidence: 99%

Groups of galaxies in the SDSS Data Release 7

Tago¹,

Saar²,

Tempel

et al. 2010

A&A

101

161

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Aims. We extract groups of galaxies as flux-limited and volume-limited samples from the SDSS Data Release 7 (DR7) to study the supercluster-void network and environmental properties of groups therein. Volume-limited catalogues are particularly useful for a comparison of numerical simulations of dark matter halos and the large-scale structure with observations. Methods. The extraction of a volume-limited sample of galaxies and groups requires special care to avoid excluding too much observational data. We use a modified friends-of-friends (FoF) method with a slightly variable linking length to obtain a preliminary flux-limited sample. We take the flux-limited groups as the basic sample to include as many galaxies as possible in the volume-limited samples. To determine the scaling of the linking length we calibrated group sizes and mean galaxy number densities within groups by magnitude dilution of a nearby group sub-sample to follow the properties of groups with higher luminosity limits. Results. Our final flux-limited sample contains 78800 groups and volume-limited subsamples with absolute magnitude limits M r = −18, −19, −20, and −21 contain 5463, 12 590, 18 973, and 9139 groups, respectively, in the DR7 main galaxy main area survey. The group catalogue is available at the CDS. Conclusions. The spatial number densities of our groups within the subsamples, as well as the mean sizes and rms velocities of our groups practically do not change from sub-sample to sub-sample. This means that the catalogues are homogeneous and well suited for a comparison with simulations.

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Galaxy Groups in the Third Data Release of the Sloan Digital Sky Survey

Cited by 115 publications

References 18 publications

Observational probes of cosmic acceleration

Observational probes of cosmic acceleration

Groups and clusters of galaxies in the SDSS DR8

Groups of galaxies in the SDSS Data Release 7

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