Monday. Hope to get the gg lens plots done (all done! the ones for the telecon tomorrow) today, and then start running the shape measurements. And holy crap, Vox Charta is going to be great! Thanks to James G. for letting me open a AIfA-Cosmo account.
1111.2602
Haloes and voids in f(R) gravity
Li, Zhao, Koyama
Study distribution of DM haloes and voids using high-res sims in f(R) gravity models with chameleon mechanism (screen the fifth force in dense environment). The semin-analytic thin shell condition with a suitably-defined environment provides a good approximation to describe the mass and environmental dependence of the screening in haloes. Compared to LCDM, there are far more massive halos and large voids in f(R) models compared with the LCDM model. For |f_{R0}|=1e-5 and 1e-4, there are twice and x4 many voids with radius 15 Mpc/h effective radius. A new means to test the models using observational data. Halos inside voids are all unscreened--ideal objects for the gravity test.
1111.2603
A successful broad-band survey for giant Lya Nebulae I: Survey design and candidate selection
Prescott, Dey, Jannuzi
Lya blobs (giant Lya nebulae) are hard to find, although they must be sites of ongoing massive galaxy formation; want to study a coherent picture of their properties, ionization mechanisms, and space density. Developed a systematic search technique designed to find large Lya nebulae at 2<z<3 within deep broad-band imaging and have carried out a survey of the 9.4 sq. deg NDWFS Bootes field, corresponding to comoving volume of 1e8 Mpc^3. Select sample of 80 candidates presented.
* how do they do this? I want to know.
1111.2607
Complementarity of indirect and accelerator DM searches
Bertone, et al
Even if SUSY particles are found at LHC, it will be difficult to prove that they constitute the bluk of DM in the universe using LHC alone. Study complementarity of LHC and DM indirect searches; work out explicitly the reconstruction of the DM properties for a specific benchmark model in the coannihilation region [??] of a 24 parameter SUSY model. Combine LHC data with Fermi LAT, show current LAT limits already have capability of ruling out spurious Wino-like solution that survives LHC data only. Planck constraints on the reionization history will have similar constraining power; discuss impact of a possible detection of gamma-rays from DM annihilation in Draco with a CTA-like experiment. Indirect searches can be strongly complementary to the LCH in identifying the DM particles, even when astrophysical uncertainties are taken into account.
1111.2611
The cosmic abundance of classical MW satellites
Strigari, Wechsler
Study abundance of satellites akin to the brightest, classical dwarf spheroidals around galaxies similar in magnitude and isolation to MW and M31 in SDSS. Bound mean and scatter in number of satellites down to 10 mags fainter than MW. Number of spheroidals around MW (that are as bright as Sagittarius or Fornax dwarf spheroidal) is not a significant outlier. LCDM missing satellite problem still exists.
1111.2721
Inhomogeneous non-Gaussianity
Byrnes, Nurmi, Tasinato, Wands
Method to probe inhomogeneity of local non-Gaussian parameters, such as f_NL, measured within small patches of the sky. Correlators between n-point functions measured in one patch of the sky, and k-point functions measured in another patch depend upon the (n+k) point functions over the entire sky. The inhomogeneity of non-Gaussian parameters may be a feasible way to detect or constrain higher-order correlators in local models of non-Gaussianity, as well as to distinguish between single and multiple-source scenarios for generating the primordial density perturbation, and more generally to probe the details of inflationary physics.
* for Xun.
1111.2722
Probing the anisotropic expansion history of the universe with cosmic microwave background
Mohapatra, Saumia, Srivastava
Propose simple technique to detect any anisotropic expansion stage in the history of the universe from inflation to surface of last scattering, from CMB data. Any anisotropic expansion in the universe would deform the shapes of the primordial density perturbations, and this deformation can be detected in a shape analysis of superhorizaon fluctuations in the CMBR. Obtain constraint on any previous anisotropic expansion of the universe at <35%.
1111.2726
The age of extremely red and massive galaxies at very high redshift
Castro-Rodriguez, Lopez-Corredoira
Select extremely red objects at high redshift, and check out their ages. Find that higher the stellar mass, the lower the age of the Universe at which it was formed. Conflict with LCDM that claim the most massive galaxies formed after lower-mass ones.
1111.2745
The slignment of molecular cloud magnetic fields with the spiral arms in M33
Li, Henning
Observing 6 giant molecular cloud complexes in the hearby, almost face-on, galaxy M33, find that the magnetic fields are aligned with the spiral arms, suggesting that the large-scale field in M33 anchors the clouds. Some cloud formation models suggest that large-scale galactic magnetic field is irrelevant at the scale of individual clouds, because turbulence and rotation of cloud may randomize the orientation of its magnetic field. Alternatively, galactic fields could be strong enough to impose their direction upon individual clouds, thereby regulating cloud accumulation and fragmentation, and affecting the rate and efficiency of star formation.
1111.2764
The assembly of the halo system of the MW as revealed by SDSS/SEGUE: the CEMP star connection
Beers, Carollo
SDSS-SEGUE show two populations of MW haloes: inner halo and the outer halo, with demonstrably different characteristics (metallicity distributions, density distributions, kinematics). Better understanding of the increase of the fraction of the carbon-enhanced metal-poor (CEMP) stars with decreasing metallicity.
1111.2776
APEX CO(9-8) mapping of an extremely high-velocity and jet-like outflow in a high-mass star-forming region
APEX mapping of high-mass SF region show ~0.5pc, jet-like and bipolar molecular outflow. Extremely high-velocity line wings, indicate temperature of >100K and density >1e4 cm^-3. Typical bow-shock-driven flow. Observation unveil a highly-excited and collimated component in the bipolar outflow that is powered by a high-mass protostar, provides insights into the mechanism of the outflow.
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