The Low Redshift survey at Calar Alto (LoRCA)

Comparat, Johan; Chuang, Chia-Hsun; Rodríguez-Torres, Sergio; Pellejero-Ibáñez, Marcos; Prada, Francisco; Yepes, Gustavo; Courtois, H. M.; Zhao, Gong-Bo; Wang, Y.; Sánchez, Javier; Maraston, Claudia; Metcalf, R. Benton; Peiro-Perez, J.; Kitaura, Francisco-Shu; Pérez, E.; Delgado, R. M. González

doi:10.1093/mnras/stw326

Cited by 5 publications

(6 citation statements)

References 80 publications

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“…Within the next two years, the eBOSS (Dawson et al 2016) survey will observe about 200,000 ELGs, which will allow us to increase the accuracy in our measurements and precisely determine the typical ELG host halo masses, satellite fraction values and velocity distributions. At the same time, the Low Redshift survey at Calar Alto (LoRCA; Comparat et al 2016) plans to observe galaxies at z < 0.2 in the northern sky, to complement the current SDSS-III/BOSS and SDSS-IV/eBOSS database. These projects will provide accurate spectroscopy and photometry for a huge number of galaxy targets, allowing us to considerably improve the quality of our emission line galaxy measurements and the precision of our models.…”

Section: Discussionmentioning

confidence: 99%

Galaxy clustering dependence on the [O ii] emission line luminosity in the local Universe

Favole

Rodríguez-Torres

Comparat

et al. 2017

Monthly Notices of the Royal Astronomical Society

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We study the galaxy clustering dependence on the [O ii] emission line luminosity in the SDSS DR7 Main galaxy sample at mean redshift z ∼ 0.1. We select volumelimited samples of galaxies with different [O ii] luminosity thresholds and measure their projected, monopole and quadrupole two-point correlation functions. We model these observations using the 1h −1 Gpc MultiDark Planck cosmological simulation and generate light-cones with the SUrvey GenerAtoR algorithm. To interpret our results, we adopt a modified (Sub)Halo Abundance Matching scheme, accounting for the stellar mass incompleteness of the emission line galaxies. The satellite fraction constitutes an extra parameter in this model and allows to optimize the clustering fit on both small and intermediate scales (i.e. r p 30 h −1 Mpc), with no need of any velocity bias correction. We find that, in the local Universe, the [O ii] luminosity correlates with all the clustering statistics explored and with the galaxy bias. This latter quantity correlates more strongly with the SDSS r-band magnitude than [O ii] luminosity. In conclusion, we propose a straightforward method to produce reliable clustering models, entirely built on the simulation products, which provides robust predictions of the typical ELG host halo masses and satellite fraction values. The SDSS galaxy data, MultiDark mock catalogues and clustering results are made publicly available.

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Section: Discussionmentioning

confidence: 99%

Galaxy clustering dependence on the [O ii] emission line luminosity in the local Universe

Favole

Rodríguez-Torres

Comparat

et al. 2017

Monthly Notices of the Royal Astronomical Society

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“…The covariance matrix is not decreasing around its diagonal as the covariance matrix of the 2-point correlation function does (see Fig. 7 of Comparat et al 2016). Indeed there is a large amount of correlation between structure, i.e.…”

Section: Covariance With Massmentioning

confidence: 92%

Accurate mass and velocity functions of dark matter haloes

Comparat¹,

Prada²,

Yepes³

et al. 2017

Monthly Notices of the Royal Astronomical Society

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N-body cosmological simulations are an essential tool to understand the observed distribution of galaxies. We use the MultiDark simulation suite, run with the Planck cosmological parameters, to revisit the mass and velocity functions. At redshift z = 0, the simulations cover four orders of magnitude in halo mass from ∼ 10 11 M with 8,783,874 distinct halos and 532,533 subhalos. The total volume used is ∼515 Gpc 3 , more than 8 times larger than in previous studies. We measure and model the halo mass function, its covariance matrix w.r.t halo mass and the large scale halo bias. With the formalism of the excursion-set mass function, we explicit the tight interconnection between the covariance matrix, bias and halo mass function. We obtain a very accurate (< 2% level) model of the distinct halo mass function. We also model the subhalo mass function and its relation to the distinct halo mass function. The set of models obtained provides a complete and precise framework for the description of halos in the concordance Planck cosmology. Finally, we provide precise analytical fits of the V max maximum velocity function up to redshift z < 2.3 to push for the development of halo occupation distribution using V max . The data and the analysis code are made publicly available in the Skies and Universes database.

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“…• MultiDark-Galaxies Catalogs of galaxies made with the GALACTICUS, SAG and SAGE semi-analytical models of galaxy formation (Knebe et al 2017) • MultiDarkLens provides to the scientific community high quality weak lensing data using the MultiDark cosmological N-body simulations (Giocoli et al 2016) • LoRCA (Comparat et al 2016a) Galaxy mock catalogs for the Calar Alto Local Universe survey.…”

Section: Mock Galaxy Catalogsmentioning

confidence: 99%

Skies And Universes: Accessing cosmological simulations and theoretical predictions

Klypin¹,

Prada²,

Comparat³

2017

Preprint

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Numerical simulations play a key important role in modern cosmology. Examples are plenty including the cosmic web -large scale structure of the distribution of galaxies in space -which was first observed in N -body simulations and later discovered in observations. The cuspy dark matter halo profiles, the overabundance of satellites, the Too-Big-Too-Fail problem are other examples of theoretical predictions that have a dramatic impact on recent developments in cosmology and galaxy formation. Large observational surveys such as e.g. SDSS, Euclid, and LSST are intimately connected with extensive cosmological simulations that provide statistical errors and tests for systematics. Accurate predictions for baryonic acoustic oscillations and redshift space distortions from high-resolution and large-volume cosmological simulations are required for interpretation of these large-scale galaxy/qso surveys. However, most of the results from extensive computer simulations, that would be greatly beneficial if publicly available, are still in hands of few research groups. Even when the simulation data is available, sharing vast amounts of data can be overwhelming. We argue that there is an effective and simple path to expand the data access and dissemination of numerous results from different cosmological models. Here we demonstrate that public access can be effectively provided with relatively modest resources. Among different results, we release for the astronomical community terabytes of raw data of the popular Bolshoi and MultiDark simulations. We also provide numerous results that are focused on mimicking observational data and galaxy surveys for major projects. Skies and Universes is a community effort: data are produced and shared by many research groups. We offer to other cosmologists and astronomers to host their data products in the skiesanduniverses.org space.

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The Low Redshift survey at Calar Alto (LoRCA)

Cited by 5 publications

References 80 publications

Galaxy clustering dependence on the [O ii] emission line luminosity in the local Universe

Galaxy clustering dependence on the [O ii] emission line luminosity in the local Universe

Accurate mass and velocity functions of dark matter haloes

Skies And Universes: Accessing cosmological simulations and theoretical predictions

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