A5033567615- Galaxies: Formation, Evolution, Phenomena
- Astronomy and Astrophysical Research
- Stellar, planetary, and galactic studies
- Gamma-ray bursts and supernovae
- Astrophysics and Cosmic Phenomena
- Remote Sensing in Agriculture
- CCD and CMOS Imaging Sensors
- Cosmology and Gravitation Theories
- Astrophysical Phenomena and Observations
- Spectroscopy and Chemometric Analyses
- Astronomical Observations and Instrumentation
- Musicology and Musical Analysis
- Insect and Arachnid Ecology and Behavior
- Medical Imaging Techniques and Applications
- Impact of Light on Environment and Health
- Astrophysics and Star Formation Studies
- Diverse Musicological Studies
- Plant Water Relations and Carbon Dynamics
- Advanced X-ray Imaging Techniques
- Radio Astronomy Observations and Technology
- Animal Vocal Communication and Behavior
Shanghai Astronomical Observatory
2013-2024
University of Science and Technology Chittagong
2006
Chinese Academy of Sciences
2003
National Astronomical Observatories
2001-2003
Central China Normal University
2001
Beijing Meteorological Bureau
2001
We apply a halo-based group finder to four large redshift surveys, the 2MRS, 6dFGS, SDSS and 2dFGRS, construct catalogs in low-redshift Universe. The is based on that of Yang et al. but with an improved halo mass assignment so it can be applied uniformly various surveys galaxies. Halo masses are assigned groups according proxies stellar mass/luminosity member performances grouping galaxies common halos assignments tested using realistic mock samples constructed from hydrodynamical...
Abstract We extend the halo-based group finder developed by Yang et al. (2005c) to use data simultaneously with either photometric or spectroscopic redshifts. A mock galaxy redshift survey constructed from a high-resolution N -body simulation is used evaluate performance of this extended finder. For galaxies magnitude z ≤ 21 and 0 < 1.0 in DESI legacy imaging surveys (the Legacy Surveys), our successfully identifies more than 60% members about 90% halos mass ≳10 12.5 h −1 M ⊙ . Detected...
As the largest radio telescope in world, Square Kilometre Array (SKA) will lead next generation of astronomy. The feats engineering required to construct array be matched only by techniques developed exploit rich scientific value data. To drive forward development efficient and accurate analysis methods, we are designing a series data challenges that provide community with high-quality datasets for testing evaluating new techniques. In this paper present description results from first such...
Using the self-consistent modeling of conditional stellar mass functions across cosmic time by Yang et al., we make model predictions for star formation histories (SFHs) central galaxies in halos different masses. The requires following two key ingredients: (1) assembly and satellite (2) local observational constraints rates (SFRs) as a function halo mass. We obtain universal fitting formula that describes (median) SFH mass, galaxy redshift. use this to various aspects SFRs time. Our main...
We examine the quenched fraction of central and satellite galaxies as a function galaxy stellar mass, halo matter density their large scale environment. Matter densities are inferred from our ELUCID simulation, constrained simulation local Universe sampled by SDSS, while masses central/satellite classification taken group catalog Yang et al. The for total population increases systematically with three quantities. find that `environmental quenching efficiency', which quantifies is independent...
In this paper, we set out to construct a of reference mock galaxy redshift surveys (MGRSs) for the future Chinese Space-station Survey Telescope (CSST) observation, where subsequent survey selection effects can be added and evaluated. This MGRSs is generated using dark matter subhalos extracted from high-resolution Jiutian $N$-body simulation standard $\Lambda$CDM cosmogony with $\Omega_m=0.3111$, $\Omega_{\Lambda}=0.6889$, $\sigma_8=0.8102$. The has boxsize $1~h^{-1} {\rm Gpc}$, consists...
A galaxy group catalog is constructed from the 2MASS Redshift Survey (2MRS) with use of a halo-based finder. The halo mass associated estimated using `GAP' method based on luminosity central and its gap other member galaxies. Tests mock samples shows that this reliable, particularly for poor systems containing only few members. On average 80% all groups have completeness >0.8, about 65% zero contamination. Halo masses are typical uncertainty $\sim 0.35\,{\rm dex}$. application finder to 2MRS...
Abstract We extend the real-space mapping method developed in Shi et al. so that it can be applied to flux-limited galaxy samples. use an ensemble of mock catalogs demonstrate reliability this extension, showing allows for accurate recovery correlation functions and biases. also that, using iterative intermediate-scale clustering data, we obtain unbiased estimate growth rate structure <?CDATA $f{\sigma }_{8}$?> , which is related amplitude matter, accuracy ∼10%. Applying Sloan Digital Sky...
Abstract The intrinsic alignment of galaxies is an important systematic effect in weak-lensing surveys, which can affect the derived cosmological parameters. One direct way to distinguish different models and quantify their effects on measurement produce mock surveys. In this work, we use full-sky ray-tracing technique images from ELUCID N -body simulation run with WMAP9 cosmology. our model, assume that shape central elliptical galaxy follows dark matter halo, spiral halo spin. Using...
Using a method to correct redshift space distortion (RSD) for individual galaxies, we mapped the real distributions of galaxies in Sloan Digital Sky Survey (SDSS) Data Release 7 (DR7). We use an ensemble mock catalogs demonstrate reliability our method. Here as first paper series, mainly focus on two point correlation function (2PCF) galaxies. Overall 2PCF measured reconstructed brighter than $^{0.1}{\rm M}_r-5\log h=-19.0$ agrees with direct measurement accuracy better error due cosmic...
In a recent study, using the distribution of galaxies in north galactic pole SDSS DR7 region enclosed 500$\mpch$ box, we carried out our ELUCID simulation (Wang et al. 2016, III). Here {\it light} dark matter halos and subhalos reconstructed with observations novel neighborhood} abundance matching method. Before make use thus established galaxy-subhalo connections to evaluate galaxy formation models, set explore reliability such link. For this purpose, focus on following few aspects...
Reliable halo mass estimation for a given galaxy system plays an important role both in cosmology and formation studies. Here we set out to find the way that can improve those systems with limited brightest member galaxies been observed. Using four mock samples constructed from semi-analytical models, subhalo abundance matching method conditional luminosity functions, respectively, gap between subsequent (group) be used significantly reduce scatter based on of alone. Tests show these...
Abstract Halo bias is the one of key ingredients halo models. It was shown at a given redshift to be only dependent, first order, on mass. In this study, four types cosmic web environments—clusters, filaments, sheets, and voids—are defined within state-of-the-art high-resolution N -body simulation. Within these environments, we use both halo-dark matter cross correlation halo-halo autocorrelation functions probe clustering properties halos. The nature differs strongly between different...
We propose a novel method to constrain the missing fraction of galaxies using galaxy clustering measurements in conditional stellar mass function (CSMF) framework, which is applicable surveys that suffer significantly from sample selection effects. The measurements, are not sensitive random sampling (missing fraction) galaxies, widely used stellar-halo relation (SHMR). By incorporating (incompleteness) component into CSMF model (ICSMF), we use incomplete and simultaneously fractions SHMRs....
Based on the star formation histories (SFH) of galaxies in halos different masses, we develop an empirical model to grow dark mattet halos. This has very few ingredients, any which can be associated observational data and thus efficiently assessed. By applying this a high resolution cosmological $N$-body simulation, predict number galaxy properties that are good match relevant data. Namely, for both centrals satellites, stellar mass function (SMF) up redshift $z\simeq4$ conditional functions...
We combine data from the Sloan Digital Sky Survey (SDSS) and Arecibo Legacy Fast ALFA (ALFALFA) to establish an empirical model for HI gas content within dark matter halos. A cross-match between our SDSS DR7 galaxy group sample ALFALFA sources provides a catalog of 16,520 HI-galaxy pairs 14,270 groups (halos). Using these matched pairs, we mass distributions halos using two components: 1) {\it in situ} relations that involve masses, colors $({\rm g-r})$ stellar masses 2) ex dependence on...
We combined data from the Sloan Digital Sky Survey (SDSS) and Arecibo Legacy Fast ALFA (ALFALFA) to establish HI mass vs. stellar halo scaling relations using an abundance matching method that is free of Malmquist bias. To enable matching, a cross-match between SDSS DR7 galaxy group sample ALFALFA sources provides catalog 16,520 HI-galaxy pairs within 14,270 groups (halos). By applying observational completeness reductions for both optical observations, we used remaining 8,180 matched...
Abstract We find that for the galaxy groups, luminosity gap between brightest and subsequent member galaxies in a halo (group) can be used to significantly reduce scatter mass estimation based on of alone. These corrections estimations by ~ 50% 70% massive halos.
A model of supernova-driven chemical evolution the Galactic halo proposed by Tsujimoto et al. ([CITE]) (TSY) is used to investigate observations first generation stars (FGS). We assume in this paper that a star with metallicity truly FGS. obtain FGS probabilities Miller-Scalo form stellar initial mass function and limit our parameters values consistent observed distributions metal-poor range . find distribution (MDF) long-lived field for against iron abundance agreement observations. If...