A5083885975- Galaxies: Formation, Evolution, Phenomena
- Astronomy and Astrophysical Research
- Scientific Research and Discoveries
- Stellar, planetary, and galactic studies
- Complex Systems and Time Series Analysis
- Cosmology and Gravitation Theories
- Archaeological and Historical Studies
- Gamma-ray bursts and supernovae
- Astronomical Observations and Instrumentation
- Remote Sensing in Agriculture
- Cultural and Mythological Studies
- Bayesian Methods and Mixture Models
- History and Developments in Astronomy
- Mathematical Dynamics and Fractals
- Gaussian Processes and Bayesian Inference
- Philosophical Thought and Analysis
- Astro and Planetary Science
- Archaeological and Geological Studies
- Astrophysics and Star Formation Studies
- Medieval European Literature and History
- Statistical and numerical algorithms
- Advanced Mathematical Theories and Applications
- Fractal and DNA sequence analysis
- Theoretical and Computational Physics
- Advanced Statistical Methods and Models
Universitat de València
2013-2023
Parc Científic de la Universitat de València
2013-2023
Lamsade
2023
Université Paris Dauphine-PSL
2023
Seatrans (Norway)
2022
Empowerment Program
2016
University of Groningen
2005
Spanish National Observatory
2002
Queen Mary University of London
1994
Novo Nordisk (Denmark)
1987-1988
The main feature of the spatial large-scale galaxy distribution is its intricate network filaments. This spanned by locations that can be interpreted as a three-dimensional point distribution. global properties process measured different statistical methods, which, however, do not describe directly structure elements. morphology large scale structure, on other hand, an important property Here we apply object with interactions (the Bisous model) to trace and extract filamentary in presently...
Baryon Acoustic Oscillations (BAOs) provide a "standard ruler" of known physical length, making it one the most promising probes nature dark energy (DE). The detection BAOs as an excess power in galaxy distribution at certain scale requires measuring positions and redshifts. "Transversal" (or "angular") measure angular size this projected sky information about distance. "Line-of-sight" "radial") require very precise redshifts, but direct measurement Hubble parameter different more sensitive...
Here we describe the first results of Advanced Large Homogeneous Area Medium-Band Redshift Astronomical (ALHAMBRA) survey, which provides cosmic tomography evolution contents universe over most history. Our novel approach employs 20 contiguous, equal-width, medium-band filters covering from 3500 Å to 9700 Å, plus standard JHKs near-infrared (NIR) bands, observe a total area 4 deg2 on sky. The optical photometric system has been designed maximize number objects with accurate classification by...
The Advance Large Homogeneous Area Medium-Band Redshift Astronomical (ALHAMBRA) survey has observed eight different regions of the sky, including sections Cosmic Evolution Survey (COSMOS), DEEP2, European Large-Area Infrared Space Observatory (ELAIS), Great Observatories Origins Deep North (GOODS-N), Sloan Digital Sky (SDSS) and Groth fields using a new photometric system with 20 optical, contiguous ∼300-Å filters plus JHKs bands. filter is designed to optimize effective redshift depth...
The origin and shape of metabolic scaling has been controversial since Kleiber found that basal rate animals seemed to vary as a power law their body mass with exponent 3/4, instead 2/3, surface-to-volume argument predicts. universality 3/4 -claimed in terms the fractal properties nutrient network- recently challenged according empirical evidence observed wealth robust exponents deviating from 3/4. Here we present conceptually simple thermodynamic framework, where dependence emerges...
In the coming years, several cosmological surveys will rely on imaging data to estimate redshift of galaxies, using traditional filter systems with 4–5 optical broad bands; narrower filters improve spectral resolution, but strongly reduce total system throughput. We explore how photometric performance depends number nf, characterizing survey depth by fraction galaxies unambiguous estimates. For a combination exposure time and telescope area 270 hr m2, perform significantly worse, both in...
We present the results of a study morphology and galaxy content Sloan Great Wall (SGW), richest system in nearby universe. use luminosity density field to determine superclusters SGW, fourth Minkowski functional V3 morphological signature (the K1–K2 shapefinder curve) show different morphologies from single filament multibranching, clumpy planar system. that supercluster SCl 126, especially its core, resembles very rich filament, while another 111, "multispider"—an assembly high-density...
Context. The study of the signatures multimodality in groups and clusters galaxies, an environment for most galaxies Universe, gives us information about dynamical state merging processes, which affect formation evolution clusters, larger structures – superclusters whole cosmic web.
The observed Lyman-Alpha (Lya) line profile is a convolution of the complex Lya radiative transfer taking place in interstellar, circumgalactic and intergalactic medium (ISM, CGM, IGM, respectively). Discerning different components crucial order to use it as probe galaxy formation or evolution IGM. We present second version zELDA (redshift Estimator for Line profiles Distant emitters), an open-source Python module focused on modeling fitting profiles. This new focuses disentangling galactic...
Past surveys have revealed that the large-scale distribution of galaxies in universe is far from random: it highly structured over a vast range scales. Surveys being currently undertaken and planned for next decades will provide wealth information about this structure. The ultimate goal must be not only to describe galaxy clustering as now, but also explain how arose consequence evolutionary processes acting on initial conditions we see cosmic microwave background anisotropy data. In order...
We propose to apply a marked point process automatically delineate filaments of the large-scale structure in redshift catalogues. illustrate feasibility idea on an example simulated catalogues, describe procedure, and characterize results. find distribution length filaments, suggest how use this approach obtain other statistical characteristics filamentary networks.
view Abstract Citations (106) References (14) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS Multifractal Description of the Large-Scale Structure Universe Jones, Bernard J. T. ; Martinez, Vincent Saar, Enn Einasto, Jaan We show that clustering structures in observed universe and numerical simulations are not well represented by a homogeneous measure on fractal. propose instead good description these is given "multifractals" - fractals having more than one...
Summary We propose to apply an object point process delineate filaments of the large scale structure in red shift catalogues automatically. illustrate feasibility idea on example recent 2dF Galaxy Redshift Survey, describe procedure and characterize results.
Context. The main feature of the spatial large-scale galaxy distribution is an intricate network filaments. Although many attempts have been made to quantify this network, there no unique and satisfactory recipe for that yet. Aims. present paper compares filaments in real data numerical models, see if our best models reproduce statistically filamentary galaxies. Methods. We apply object point process with interactions (the Bisous process) trace describe both observed samples 2dFGRS...
KIC 8462852 stood out among more than 100,000 stars in the Kepler catalogue because of strange features its light curve: a wide, asymmetric dimming taking up to 15 per cent at D793 and period multiple, narrow dimmings happening approximately 700 days later. Several models have been proposed account for this abnormal behaviour, most which require either unlikely causes or finely-tuned timing. We aim offering relatively natural solution, invoking only phenomena that previously observed,...
Our goal is to develop and test a novel methodology compute accurate close pair fractions with photometric redshifts. We improve the current methodologies estimate merger fraction f_m from redshifts by (i) using full probability distribution functions (PDFs) of sources in redshift space, (ii) including variation luminosity z both selection samples ratio constrain, (iii) splitting individual PDFs into red blue spectral templates deal robustly colour selections. performance our new provided...
One of the basic tenets exobiology is need for a liquid substratum in which life can arise, evolve, and develop. The most common version this idea involves necessity water to act as such substratum, both because that case on Earth it seems be viable chemical reactions lead life. Other media could harbor life, however, have occasionally been put forth. In work, we investigate relative probability finding superficial seas rocky worlds composed nine different, potentially abundant, liquids,...
view Abstract Citations (107) References (41) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS Clustering Paradigms and Multifractal Measures Martinez, Vicent J. ; Jones, Bernard T. Dominguez-Tenreiro, Rosa van de Weygaert, Rien A subsample of the CfA galaxy catalog two clustering models look different to eye, yet have comparable two-point correlation functions. We show how technique "measure analysis" clearly reveals nature differences, thereby providing an...
There is overwhelming evidence from the CfA redshift survey that distribution of galaxies in Universe obeys a scaling law on length scales less than |$\sim 5h^{-1}$| Mpc. Despite this scale invariance, not well represented by homogeneous fractal these scales. The dependence correlation r0 with sample depth and luminosity studied.
The correlation function of the distribution matter in universe shows, at large scales, baryon acoustic oscillations, which were imprinted prior to recombination. This feature was first detected luminous red galaxies Sloan Digital Sky Survey (SDSS). Recently, final release (DR7) SDSS has been made available, and useful volume is about two times bigger than old sample. We present here, for time, redshift–space this sample scales together with that one shallower, but denser volume-limited...
The ALHAMBRA survey aims to cover 4 deg2 using a system of 20 contiguous, equal width, medium-band filters spanning the range 3500 Å–9700 Å plus standard JHKs filters. Here we analyze deep near-IR number counts one our fields (ALH08) for which have relatively large area (0.5 deg2) and faint photometry (J = 22.4, H 21.3, K 20.0 at 50% recovery efficiency point-like sources). We find that logarithmic gradient galaxy undergoes distinct change flatter slope in each band: from 0.44 [17.0, 18.5]...
We study the morphology of a set superclusters drawn from SDSS DR7. calculate luminosity density field to determine flux- limited sample galaxies DR7, and select with 300 more for our study. The is described fourth Minkowski functional V3, morphological signature (the curve in shapefinder's K1-K2 plane) shape parameter ratio shapefinders K1/K2). investigate supercluster using multidimensional normal mixture modelling, use Abell clusters identify known large-scale distribution superclusters....
Context. The study of the properties galaxy clusters and their environment gives us information about formation evolution galaxies, groups clusters, larger structures – superclusters galaxies whole cosmic web.