Calendar
2011
September-December
Mon, Dec 5 |
TCC Presentation / Theoretical Astrophysics Seminar Hydrogen and Helium Reionization [abstract] |
Fri, Dec 2 |
Special Astronomy/Physics Joint Colloquium Cosmic Information: IT from BIT, from BITs in IT [abstract] J. Richard Bond, Canadian Institute for Theoretical Astrophysics (CITA) |
Wed, Nov 30 |
TCC Presentation / Cosmos Seminar Giant Gamma-ray Bubbles in the Inner Galaxy: AGN Activity or Bipolar Galactic Wind? [abstract] |
Mon, Nov 21 |
PhD Defense Presentation / Theoretical Astrophysics Seminar Toward an Understanding of the Large Scale Structure of the Universe with Galaxy Surveys [abstract] |
Mon, Nov 14 |
TCC Presentation / Theoretical Astrophysics Seminar The Plasma Physics and Cosmological Implications of TeV Blazars [abstract] Philip Chang, University of Wisconsin, Milwaukee (formerly of CITA-ICAT) |
Wed, Nov 9 |
TCC Presentation / Cosmos Seminar Cosmology without Cosmic Variance [abstract] |
Wed, Nov 2 |
TCC Presentation / Cosmos Seminar The Mass Assembly History of Black Holes in the Universe [abstract] |
Wed, Oct 26 |
TCC Presentation / Cosmos Seminar New Results from the South Pole Telescope [abstract] |
Mon, Oct 24 |
TCC Presentation / Theoretical Astrophysics Seminar From OWLS to FiBY: Numerical Simulations of Galaxy Formation and Evolution [abstract] Claudio Dalla Vecchia, Max Planck Institute for Extraterrestrial Physics |
Mon, Oct 17 |
TCC Presentation / Theoretical Astrophysics Seminar Lyman-alpha in Three Dimensions [abstract] |
Thurs, Sep 29 |
TCC Presentation / Extragalactic Seminar Galaxy Mergers through Cosmic Time [abstract] |
Thurs, Sep 8 |
TCC Presentation / Extragalactic Seminar Galaxy Formation and Evolution through Metals [abstract] |
January-May
Mon, May 23 |
TCC Presentation / Special Seminar Galaxy-Galaxy Weak Lensing as a Tool to Correct Finger-of-God Effects in Redshift Power Spectrum Measurements [abstract] Luminous red galaxies (LRGs) are useful tracers of halo distributions with mass larger than ~10^13Msolar. One of the major systematic error comes from the non-linear redshift distortion known as the Finger-of-God (FoG) effect because the internal motion of LRGs within their host halos is less known. We develop a method of correcting FoG effect by using LRG-galaxy weak lensing, or cross-correlation between foreground LRGs and background galaxy image distortion. We estimate the velocity dispersion of LRGs using their off-centering effect which suppresses the lensing signals at small angular scales. Employing observationally motivated off-centering models, we find that the FoG effect suppresses the LRG power spectrum by 10 (30)% level at scales k = 0.1(0.2)h/Mpc. LRG lensing spectrum expected from the joint analysis of upcoming imaging and spectroscopic surveys allow us to measure the velocity dispersion of LRGs within a few % statistical uncertainty. As a consequence, the error of the growth rate of cosmological perturbations decreases by a factor of 2 over a wide range of redshifts compared to the case that the velocity dispersion is unknown. The errors of the dark energy equation-of-state parameter and the neutrino energy fraction also decreases by 5-20%. The relation between off-centering profile and velocity dispersion generally provides a useful information to understanding the dynamical history of LRGs. |
Thurs, May 12 |
TCC Presentation / Special Seminar Host vs. Subhalo-2D Density Profile Measured from Galaxy-Galaxy Lensing [abstract] |
Fri, May 6 |
TCC Presentation / Special Seminar Velocity Probe on Cosmology [abstract] |
Thurs, May 5 |
TCC Presentation / Extragalactic Seminar The Dark Matter Halo - Galaxy Connection in the Local Universe and Local Group [abstract] |
Thurs, Apr 28 |
TCC Presentation / Extragalactic Seminar Understanding the Global Course of Galaxy Evolution at z < 1 [abstract] |
Fri, Apr 22 |
TCC Presentation / Special Seminar Obscured Quasars at High Redshift [abstract] |
Tue, Apr 12 |
TCC Presentation / Weinberg Theory Seminar Screening Dark Energy [abstract] |
Wed, Mar 30 |
TCC Presentation / Cosmos Seminar The Influence of Structure Formation on the Interpretation of Dark Matter Experiments [abstract] |
Tues, Mar 8 |
TCC Presentation / Astronomy Colloquium DEEP2 and Beyond: Studying Galaxy Evolution and Large-Scale Structure with Deep Surveys [abstract] |
Tue, Feb 15 |
TCC Presentation / Astronomy Colloquium Is Inhomogeneity Important in Cosmology? [abstract] |
Wed, Feb 9 |
TCC Presentation / Cosmos Seminar High Resolution Imaging of the Sunyaev-Zel'dovich Effect in Galaxy Clusters [abstract] |
Wed, Feb 9 |
TCC Presentation / Stellar Seminar Observational Constraints on Dark Matter Heating in White Dwarf Stars [abstract] |
Mon, Jan 31 |
TCC Special Colloquium / Theoretical Astrophysics Seminar Dark Matter [abstract] |
Wed, Jan 26 |
TCC Presentation The Matching of the Cosmic Star Formation Rate and the Cosmic Supernova Rate [abstract] |
Wed, Jan 19 |
TCC / Cosmos Seminar Cosmological Imprints of f(R) Gravity [abstract] |
Tue, Jan 18 |
TCC / Colloquium (Tinsley Scholar) Dust in the Early Universe [abstract] |