A5071907665- Galaxies: Formation, Evolution, Phenomena
- Astronomy and Astrophysical Research
- Remote Sensing in Agriculture
- Gamma-ray bursts and supernovae
- History and Developments in Astronomy
- Astronomical Observations and Instrumentation
- Stellar, planetary, and galactic studies
- Gaussian Processes and Bayesian Inference
- Distributed and Parallel Computing Systems
- Scientific Computing and Data Management
- Computational Physics and Python Applications
- Cosmology and Gravitation Theories
- Scientific Research and Discoveries
- Parallel Computing and Optimization Techniques
- Pulsars and Gravitational Waves Research
- Astro and Planetary Science
- Big Data Technologies and Applications
- Dark Matter and Cosmic Phenomena
- Advanced Data Storage Technologies
- Particle accelerators and beam dynamics
- Plant Water Relations and Carbon Dynamics
Argonne National Laboratory
2019-2021
Argonne Leadership Computing Facility
2021
University of Pittsburgh
2017-2019
University of Arizona
2012
We investigate the distribution of neutron star masses in different populations binaries, employing Bayesian statistical techniques. In particular, we explore differences between sources that have experienced distinct evolutionary paths and accretion episodes. find non-recycled eclipsing high-mass binaries as well slow pulsars, which are all believed to be near their birth masses, has a mean 1.28 M_solar dispersion 0.24 M_solar. These values consistent with expectations for formation...
ABSTRACT We constrain the newly introduced decorated halo occupation distribution (HOD) model using SDSS DR7 measurements of projected galaxy clustering, $w$p(rp) galaxies in r-band luminosity-threshold samples. The HOD is a for galaxy–halo connection that augments traditional by allowing possibility assembly bias: luminosity may be correlated with dark matter properties besides mass, Mvir. demonstrate it not possible to rule out bias clustering alone. Moreover, samples Mr < −20 and...
Abstract We describe the simulated sky survey underlying second data challenge (DC2) carried out in preparation for analysis of Vera C. Rubin Observatory Legacy Survey Space and Time (LSST) by LSST Dark Energy Science Collaboration (LSST DESC). Significant connections across multiple science domains will be a hallmark LSST; DC2 program represents unique modeling effort that stresses this interconnectivity way has not been attempted before. This encompasses full end-to-end approach: starting...
The Core Cosmology Library (CCL) provides routines to compute basic cosmological observables a high degree of accuracy, which have been verified with an extensive suite validation tests. Predictions are provided for many quantities, including distances, angular power spectra, correlation functions, halo bias and the mass function through state-of-the-art modeling prescriptions available in literature. Fiducial specifications expected galaxy distributions Large Synoptic Survey Telescope...
Galaxy clustering on small scales is significantly under-predicted by sub-halo abundance matching (SHAM) models that populate (sub-)haloes with galaxies based peak halo mass, $M_{\rm peak}$. SHAM the maximum circular velocity, $V_{\rm peak}$, have had much better success. The primary reason peak}$ fail relatively low of satellite produced in these compared to those Despite success predicting clustering, a simple model results predictions for galaxy growth are at odds observations. We...
We present new results on the relationship between central galaxies and dark matter haloes inferred from observations of satellite kinematics in Sloan Digital Sky Survey (SDSS) DR7. employ an updated analysis framework that includes detailed mock catalogues to model observational effects SDSS. Our constrain colour-dependent conditional luminosity function (CLF) haloes, as well radial profile galaxies. Confirming previous results, we find red live more massive than blue at fixed luminosity....
Dark matter halo clustering depends not only on mass, but also other properties such as concentration and shape. This phenomenon is known broadly assembly bias. We explore the dependence of bias definition, parametrized by spherical overdensity parameter, $\Delta$. summarize strength concentration-, shape-, spin-dependent a function mass definition. Concentration-dependent strongly at all For conventional definitions ($\Delta \sim 200\mathrm{m}-600\mathrm{m}$), concentration-dependent low...
Most models for the connection between galaxies and their haloes ignore possibility that galaxy properties may be correlated with halo other than mass, a phenomenon known as assembly bias. Yet, it is such correlations can lead to systematic errors in interpretation of survey data. At present, degree which bias present real Universe, best strategies constraining remain uncertain. We study ability several observables constrain from redshift data using decorated occupation distribution (dHOD),...
Determining the positions of halo centres in large-scale structure surveys is crucial for many cosmological studies. A common assumption that correspond to location their brightest member galaxies. In this paper, we study dynamics galaxies with respect other members Sloan Digital Sky Survey DR7. Specifically, look at line-of-sight velocity and spatial offsets between neighbours. We compare those detailed mock catalogues, constructed from high-resolution, dark-matter-only $N$-body...
The kinematics of satellite galaxies moving in a dark matter halo are direct probe the underlying gravitational potential. Thus, phase-space distributions satellites represent powerful tool to determine galaxy-halo connection from observations. By stacking signal large number this potential can be unlocked even for haloes hosting few on average. In work, we test impact various modelling assumptions constraints derived analysing non-linear, 1-halo regime. We discuss their explain discrepancy...
We have obtained CCD photometry in 2010-11 of V963 Per (=GSC3355 0394), which is a recently identified close binary star with unequal eclipse depths. The seven new timings yield an improved ephemeris, but we caution that secondary can be affected by variation the light curve. This seems to on monthly timescale at few percent level.
The Vera C. Rubin Observatory Legacy Survey of Space and Time (LSST) will soon carry out an unprecedented wide, fast, deep survey the sky in multiple optical bands. data from LSST open up a new discovery space astronomy cosmology, simultaneously providing clues toward addressing burning issues day, such as origin dark energy nature matter, while at same time yielding that will, turn, pose fresh questions. To prepare for imminent arrival this remarkable set, it is crucial associated...