Galaxy correlations on large scales

Maddox, Steve; Efstathiou, G.; Sutherland, William J.; Loveday, Jon

doi:10.1093/mnras/242.1.43p

Cited by 675 publications

(820 citation statements)

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“…In the late 1980s and early 1990s, however, a variety of indirect evidence began to accumulate in favor of a cosmological constant. Studies of large scale galaxy clustering, interpreted in the framework of cold dark matter (CDM) models with inflationary initial conditions, implied a low matter density parameter Ω m = ρ m /ρ crit ≈ 0.15 − 0.4 (e.g., Maddox et al 1990;Efstathiou et al 1990), in agreement with direct dynamical estimates that assumed galaxies to be fair tracers of the mass distribution. Reconciling this result with the standard inflationary cosmology prediction of a spatially flat universe (Guth, 1981) required a new energy component with density parameter 1 − Ω m .…”

Section: Historysupporting

confidence: 64%

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: Historysupporting

confidence: 64%

Observational probes of cosmic acceleration

et al. 2013

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“…The deepest large-scale optical survey to date, the APM galaxy survey (Maddox et al 1990), took ~ 2 X 10 6 galaxies at Bj < 20.5 with an effective depth D ~ 600ft -1 Mpc and deduced the following properties: D for Bj < 25 is about 10 times greater than for the APM survey so applying the scaling law to the APM data we can estimate that u>(15") c* 0.03 for the stack, with a power law break at around 0.2°. Measuring w(6) is a matter of taking each catalogued galaxy in turn and finding its angular separation from all the other galaxies in the field, histogramming the data into bins of width A0 and then comparing this distribution with that of a set of uncorrected random points over the same area.…”

Section: Cosmology With Stacked Schmidt Platesmentioning

confidence: 99%

Cosmology with Stacked Schmidt Plates

McNally¹,

Peacock²,

Hawkins³

1995

International Astronomical Union Colloquium

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Abstract. Digital stacking of Schmidt Plates greatly increases the depth of the data allowing detection of galaxies at ~z ~ 1. We can probe the angular correlations of galaxy and cluster positions over scales of ~ 500/i -1 Mpc. Radial distance information can be obtained by identifying radio galaxies in the field and using their "standard candle" properties. A search for cosmic string effects, beginning with the stacked dataset, has now been extended to ~ 100 equatorial J-plates.

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“…Four different types of field distributions were generated to test the program: a uniform random distribution, a random distribution slightly centrally concentrated, a random distribution heavily weighted towards the center, and a distribution conforming to the two point angular correlation function found by Maddox et al (1990) for galaxies separated by <1°. The slight weighting towards the center was produced by generating random values in radial coordinates.…”

Section: The Simulationmentioning

confidence: 99%

Multiobject spectroscopy - Engineering design constraints from fiber assignment optimization studies

Donnelly¹,

Brodie²,

Allen³

1992

PASP

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ABSTRACT. We have developed an assignment and optimization code for use in positioning optical fibers for observations with multiobject instruments. The code automatically finds nearly optimal configurations of the fibers, and allows for a wide variety of different instrumental designs. The user is also able to interact with the various routines at run time to improve/modify the final assignment. Using only the automated portion of this code, we have quantified the effects on target acquisition efficiency of simple modifications of the design of the instrument. We have also tested the effects of different degrees and kinds of clustering of target objects. This study is designed to provide a means to compare various options for the design of multiplexing instruments.

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Galaxy correlations on large scales

Cited by 675 publications

References 0 publications

Observational probes of cosmic acceleration

Observational probes of cosmic acceleration

Cosmology with Stacked Schmidt Plates

Multiobject spectroscopy - Engineering design constraints from fiber assignment optimization studies

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