CCAPP Cosmology Lunch meets on Thursdays at 12:30 pm in the Price Place (PRB M2005)
February 27, 2014
February 13, 2014 February 6, 2014 January 30, 2014
January 23, 2014
- Hall & Taylor, http://arxiv.org/abs/1401.6018, "Intrinsic alignments in the cross-correlation of cosmic shear and CMB weak lensing"
- Schmidt et al., http://arxiv.org/abs/1401.0532, "Through the looking GLASS: HST spectroscopy of faint galaxies lensed by the Frontier Fields cluster MACS0717.5+3745"
- de Putter et al., http://arxiv.org/abs/1401.7022, "Inflationary Freedom and Cosmological Neutrino Constraints"
- Kitching et al., http://arxiv.org/abs/1401.6842, "3D Cosmic Shear: Cosmology from CFHTLenS"
January 16, 2014
January 9, 2014
- report on DES session during AAS223
- Bonaldi et al, http://arxiv.org/abs/1401.1387, "Cosmological constraints from Sunyaev-Zeldovich cluster counts: an approach to account for missing redshifts"
December 12, 2013 December 5, 2013
- van Waerbeke et al., http://arxiv.org/abs/1310.5721, "Detection of warm and diffuse baryons in large scale structure from the cross-correlation of gravitational lensing and the thermal Sunyaev-Zeldovich effect"
- Camera et al., http://arxiv.org/abs/1311.6383, "Magnification bias as a novel probe for primordial magnetic fields"
Talk by Nico Hamaus: "Cosmic Voids: Tracers of Large-Scale Structure"
Redshift surveys measure the location of millions of galaxies in the observable Universe, thereby constructing a three-dimensional map ofits large-scale structure. This structure is characterized by dense clusters of galaxies, connected by filaments and sheets of lower number density. The remaining and dominant volume within this cosmic web is taken up by voids, vast regions of relatively empty space. While clusters, filaments and sheets have all entered different stages of non-linear evolution during cosmic history, voids represent structures that more closely related to the initial conditions of the Universe.
I will discuss the prospects of considering cosmic voids as tracers of large-scale structure. While the clustering of voids alone yields a poor signal-to-noise ratio, when combined with the clustering statistics of galaxies, some interesting features emerge that may be useful for cosmological applications in the future. I will present some recent results obtained from numerical simulations and discuss their implications.
November 21, 2013 (moved to PRB M2015)
Talk by Jill Naiman: "Gas Retention and Accumulation in Dwarf Galaxies: Implications for Star Formation"
The effective supply and retention of gas in shallow gravitational potentials is a problem with implications in a diverse set of astrophysical systems. In particular, the magnitude of gas flows into mature dwarf galaxies can have large impacts on the star formation histories in these systems. In this talk, computational techniques will be used to show how such weakly bound gravitational structures might be able to accumulate gas effectively. The implications for star formation in dwarf galaxies after their incorporation into a larger host halo will be presented.
November 14, 2013 (at 13:15 due to talk by Biard lecturer Julianne Dalcanton at 12:00 in McPherson 4054)
Talk by Ben Shappee: "ASAS-SN: The All Sky Automated Survey for SuperNovae"
November 7, 2013 October 31, 2013 October 24, 2013
Talk by Khee-Gan Lee: "Mapping the z~2 Cosmic Web with Lyman-alpha Forest Tomography"
I will discuss the technique of Lyman-alpha forest tomography, in which the Lyman-alpha forest absorption from an extremely dense grid (>500 per sq deg) of background sources is used to make a full 3D `tomographic' map of large-scale structure at z~2. Using empirical luminosity functions of QSOs and LBGs, I will show that at apparent depths of g~24, the background sources are separated by comoving transverse distances of ~3 h^-1 Mpc thus enabling mapping on that resolution. Using simulations, I will show that just S/N~4 per angstrom on g=24 background sources is sufficient to generate maps with ~3 h^-1 Mpc comoving. This requires just several hrs of integration on existing spectrographs on 8-10m telescopes, e.g. VLT-VIMOS and Keck-LRIS. I will introduce CLAPTRAP, a survey to map out 1 sq deg in the COSMOS field over a comoving volume of 10^6 h^-3 Mpc^3. The resulting maps can be used to study z~2 properties as a function of their large-scale environment, characterize the topology of large-scale structure, and find galaxy protoclusters.
October 17, 2013 October 10, 2013 October 3, 2013
September 26, 2013September 19, 2013
- Taruya et. al., http://arxiv.org/abs/1309.6783, "Beyond consistency test of gravity with redshift-space distortions at quasi-linear scales"
- Bahcall and Kulier, http://arxiv.org/abs/1310.0022, "Tracing Mass and Light in the Universe: Where is the Dark Matter?"
- Darling, http://arxiv.org/abs/1310.0500, "Objects Appear Smaller as They Recede: How Proper Motions Can Directly Reveal the Cosmic Expansion, Provide Geometric Distances, and Measure the Hubble Constant"
September 12, 2013
September 5, 2013
- Lee et al., http://arxiv.org/abs/1309.1477, "Observational Requirements for Lyman-alpha Forest Tomographic Mapping of Large-Scale Structure at z ~ 2"
- Oesch et al., http://arxiv.org/abs/1309.2280, "The Most Luminous z~9-10 Galaxy Candidates yet Found: The Luminosity Function, Cosmic Star-Formation Rate, and the First Mass Density Estimate at 500 Myr"
August 29, 2013
August 22, 2013
August 15, 2013
- Kacprzak et al., http://arxiv.org/abs/1308.4663, "Sersic galaxy models in weak lensing shape measurement: model bias, noise bias and their interaction"
- Tempel et al., http://arxiv.org/abs/1308.2533, "Detecting filamentary pattern in the cosmic web: a catalogue of filaments for the SDSS"
- Biviano et al., http://arxiv.org/abs/1307.5867, "CLASH-VLT: The mass, velocity-anisotropy, and pseudo-phase-space density profiles of the z=0.44 galaxy cluster MACS 1206.2-0847"