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Cross identification between X-ray and Optical Clusters of Galaxies in the SDSS DR7 Field
Lei Wang, Xiaohu Yang, Wentao Luo +5
We use the ROSAT all sky survey X-ray cluster catalogs and the optical SDSS DR7 galaxy and group catalogs to cross-identify X-ray clusters with their optical counterparts, resultin…
Evolution of the Galaxy - Dark Matter Connection and the Assembly of Galaxies in Dark Matter Halos
Xiaohu Yang, H. J. Mo, Frank C. van den Bosch +2
We present a new model to describe the galaxy-dark matter connection across cosmic time, which unlike the popular subhalo abundance matching technique is self-consistent in that it…
Bayesian inference of galaxy formation from the K-band luminosity function of galaxies: tensions between theory and observation
Yu Lu, H. J. Mo, Neal Katz +1
We conduct Bayesian model inferences from the observed K-band luminosity function of galaxies in the local Universe, using the semi-analytic model (SAM) of galaxy formation introdu…
Reconstructing the Cosmic Velocity and Tidal Fields with Galaxy Groups Selected from the Sloan Digital Sky Survey
Huiyuan Wang, H. J. Mo, Xiaohu Yang +1
[abridge]Cosmic velocity and tidal fields are important for the understanding of the cosmic web and the environments of galaxies, and can also be used to constrain cosmology. In th…
An analytical model for the accretion of dark matter subhalos
Xiaohu Yang, H. J. Mo, Youcai Zhang +1
An analytical model is developed for the mass function of cold dark matter subhalos at the time of accretion and for the distribution of their accretion times. Our model is based o…