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Alignment between galaxies and large-scale structure
A. Faltenbacher, Cheng Li, Simon D. M. White +3
Based on the Sloan Digital Sky Survey DR6 (SDSS) and Millennium Simulation (MS) we investigate the alignment between galaxies and large-scale structure. For this purpose we develop…
Intrinsic Ellipticity Correlation of SDSS Luminous Red Galaxies and Misalignment with their Host Dark Matter Halos
Teppei Okumura, Y. P. Jing, Cheng Li
We investigate the orientation correlation of giant elliptical galaxies by measuring the intrinsic ellipticity correlation function of 83,773 luminous red galaxies (LRGs) at redshi…
Halo masses for optically-selected and for radio-loud AGN from clustering and galaxy-galaxy lensing
Rachel Mandelbaum, Cheng Li, Guinevere Kauffmann +1
We compute two-point correlation functions and measure the shear signal due to galaxy-galaxy lensing for 80,000 optically identified and 5,700 radio-loud AGN from Data Release 4 (D…
Connecting the Physical Properties of Galaxies with the Overdensity and Tidal Shear of the Large-Scale Environment
Jounghun Lee, Cheng Li
We have examined the correlations between the large-scale environment of galaxies and their physical properties, using a sample of 28,354 nearby galaxies drawn from the Sloan Digit…
Interactions, star formation and AGN activity
Cheng Li, Guinevere Kauffmann, Timothy M. Heckman +2
It has long been known that galaxy interactions are associated with enhanced star formation. In a companion paper, we explored this connection by applying a variety of statistics t…
Interaction-induced star formation in a complete sample of 10^5 nearby star-forming galaxies
Cheng Li, Guinevere Kauffmann, Timothy Heckman +2
We investigate the clustering properties of a complete sample of 10^5 star-forming galaxies drawn from the SDSS DR4. On scales less than 100 kpc, the amplitude of the correlation f…
Probing the Intrinsic Shape and Alignment of Dark Matter Haloes using SDSS Galaxy Groups
Yougang Wang, Xiaohu Yang, H. J. Mo +4
We study the three-dimensional and projected shapes of galaxy groups in the Sloan Digital Sky Survey Data Release 4, and examine the alignment between the orientation of the centra…
Galaxy Groups in the SDSS DR4: I. The Catalogue and Basic Properties
Xiaohu Yang, H. J. Mo, Frank C. van den Bosch +3
We use a modified version of the halo-based group finder developed by Yang et al. to select galaxy groups from the Sloan Digital Sky Survey (SDSS DR4). In the first step, a combina…
A fitting formula for the merger timescale of galaxies in hierarchical clustering
C. Y. Jiang, Y. P. Jing, A. Faltenbacher +2
We study galaxy mergers using a high-resolution cosmological hydro/N-body simulation with star formation, and compare the measured merger timescales with theoretical predictions ba…
Spatial and kinematic alignments between central and satellite halos
A. Faltenbacher, Y. P. Jing, Cheng Li +4
Based on a cosmological N-body simulation we analyze spatial and kinematic alignments of satellite halos within six times the virial radius of group size host halos (Rvir). We meas…
Modelling and interpreting the dependence of clustering on the spectral energy distributions of galaxies
Lan Wang, Cheng Li, Guinevere Kauffmann +1
We extend our previous physically-based halo occupation distribution models to include the dependence of clustering on the spectral energy distributions of galaxies. The high resol…
Luminosity dependence of the spatial and velocity distributions of galaxies: Semi-analytic models versus the Sloan Digital Sky Survey
Cheng Li, Y. P. Jing, Guinevere Kauffmann +3
By comparing semi-analytic galaxy catalogues with data from the Sloan Digital Sky Survey (SDSS), we show that current galaxy formation models reproduce qualitatively the dependence…
The Alignment between Satellites and Central Galaxies: Theory vs. Observations
X. Kang, Frank C. van den Bosch, Xiaohu Yang +4
Recent studies have shown that the distribution of satellite galaxies is preferentially aligned with the major axis of their central galaxy. The strength of this alignment has been…
Wolf-Rayet Galaxies in the Sloan Digital Sky Survey: the metallicity dependence of the initial mass function
Wei Zhang, Xu Kong, Cheng Li +2
We use a large sample of 174 Wolf-Rayet (WR) galaxies drawn from the Sloan Digital Sky Survey to study whether and how the slope of the stellar initial mass function depends on met…
The clustering of narrow-line AGN in the local Universe
Cheng Li, Guinevere Kauffmann, Lan Wang +3
We have analyzed the clustering of ~ 90,000 narrow-line AGN drawn from the Data Release 4 (DR4) of the SDSS. We compute the cross-correlation between AGN and a reference sample of…
Modelling galaxy clustering in a high resolution simulation of structure formation
Lan Wang, Cheng Li, Guinevere Kauffmann +1
We use the Millennium Simulation, a 10 billion particle simulation of the growth of cosmic structure, to construct a new model of galaxy clustering. We adopt a methodology that fal…
The dependence of the pairwise velocity dispersion on galaxy properties
Cheng Li, Y. P. Jing, Guinevere Kauffmann +3
(abridged) We present measurements of the pairwise velocity dispersion (PVD) for different classes of galaxies in the Sloan Digital Sky Survey. For a sample of about 200,000 galaxi…
The dependence of clustering on galaxy properties
Cheng Li, Guinevere Kauffmann, Y. P. Jing +3
(abridged)We use a sample of ~200,000 galaxies drawn from the Sloan Digital Sky Survey to study how clustering depends on properties such as stellar mass (M*), colour (g-r), 4000A…
The Cross-Correlation between Galaxies and Groups: Probing the Galaxy Distribution in and around Dark Matter Haloes
Xiaohu Yang, H. J. Mo, Frank C. van den Bosch +3
We determine the cross-correlation function between galaxies and galaxy groups, using both the Two-Degree Field Galaxy Redshift Survey (2dFGRS) and the Sloan Digital Sky Survey (SD…
The Phase-Space Parameters of Brightest Halo Galaxies
Frank C. van den Bosch, Simone M. Weinmann, Xiaohu Yang +3
The brightest galaxy in a dark matter halo is expected to reside at rest at the center of the halo. In this paper we test this `Central Galaxy Paradigm' using group catalogues extr…
Hybrid nature of 0846+51W1: a BL Lac object with a narrow line Seyfert 1 nucleus
Hong-Yan Zhou, Ting-Gui Wang, Xiao-Bo Dong +2
We have found a NLS1 nucleus in the extensively studied eruptive BL Lac, 0846+51W1, out of a large sample of NLS1 compiled from the spectroscopic dataset of SDSS DR1. Its optical s…
Partially obscured quasars in the Sloan Digital Sky Survey Early Data Release
Xiao-Bo Dong, Hong-Yan Zhou, Ting-Gui Wang +3
We have compiled a sample of 21 low redshift (z < 0.3), luminous active galactic nuclei (AGN) with large Balmer decrements (Halpha/Hbeta > 7) using the galaxy and QSO catalogs of t…
Obscured Binary Quasar Cores in SDSS J104807.74+005543.5?
Hongyan Zhou, Tinggui Wang, Xueguang Zhang +2
We report the discovery of a possible close binary system of quasars in SDSS J1048+0055. The [OIII]4959,5007 emission lines are clearly double-peaked, and two discrete radio source…
Empirical modeling of the stellar spectrum of galaxies
Cheng Li, Ting-Gui Wang, Hong-Yan Zhou +2
An empirical method of modeling the stellar spectrum of galaxies is proposed, based on two successive applications of Principal Component Analysis (PCA). PCA is first applied to th…