Day 416

Sunday.

1304.4932
How realistic are solar model atmospheres?
Pereira et al

Conclude that the 3D hydrodynamical model is superior to any of the tested 1D models, which gives further confidence in the solar abundance analysis based on it.

1304.4933
Spatially unassociated galaxies contribute significantly to the blended submillimetre galaxy population: predictions for follow-up observations of ALMA sources
Hayward, Behroozi, Somerville, Primack, Moreno, Wechsler

From mock SMG catalogs, calculate submm number counts for different beam sizes and without blending.  Model suggests that there are a sufficient number of blended SMGs to account for the observed number counts of submm sources with 850-um flux density S_850>~12 mJy.  Furthermore, predict that 30-80% of blended SMGs have at least one spatially unassociated component.  For a 15-arcsec beam, blends of >2 galaxies in which at least once component is spatially unassociated dominate the blended sources with total S_850>~3mJy.  The distribution of the redshift separations amongst the components is strongly bimodal.  The typical redshift separation of spatially unassociated blended sources is ~1.  Predictions for the contributions of spatially unassociated components and the distribution of redshift separations are not testable with currently available data, but they will be easily tested once sufficiently accurate z for the individual subcomponents (by e.g., ALMA) of a sufficient number of single-dish-detected blended SMGs are available.

1304.4937
Further evidence for a supermassive black hole mass - pitch angle relation
Berrier, et al

New and stronger evidence for relationship between galactic spiral arm pitch angle P (a measure of the tightness of spiral structure) and the mass M_BH of a disk galaxy's nuclear SMBH.  Find the relation log(M/Msun)=8.21-0.062*P.  Can be used as a SMBH mass predictor.

1304.4940
A fundamental relation between the metallicity, gas content, and stellar mass of local galaxies
Bothwell et al

Mass-metallicity relation has a strong dependence on the SFR.  Use a sample of 4253 local galaxies observed in atomic hydrogen from ALFALFA survey to demonstrate that a similar fundamental relation (the HI-FMR) also exists between stellar mass, gas-phase metallicity, and HI mass.  The latter relation is likely more fundamental, driving the relation between metallicity, SFR and mass.  At intermediate mass, gas metallicity and star metallicity relation similar, but find that the dependence of metallicity on HI content persists to the highest stellar masses, in contrast to the 'saturation' of metallicity with SFR.  It is interesting to note that the dispersion of the relation is very low at intermediate stellar masses (1e9<M*<1e11), suggesting that in this range galaxies evolve smoothly, in an equilibrium between gas inflow, outflow and SF.  At high and low stellar masses, the scatter of the relation is significantly higher, suggesting that merging events and/or stochastic accretion and SF may drive galaxies outside the relation.  Also assemble a sample of galaxies observed in CO, but small sample, strong selection bias, and influence of metallicity-dependent CO/H2 conversion factor, the data are insufficient to test any influence of molecular gas on metallicity.

1304.4992
Toward understanding the anisotropic point spread function of Suprime-Cam and its impact on cosmic shear measurement
Hamana, Miyazaki, Okura, Okamura, Futamase

Decompose PSF into 3 components, the optical aberration, atmospheric turbulence and chip-misalignment in an empirical manner, and evaluate the amplitude of each component.  Find that, for long-exposure data, the optical aberration has the largest contribution to the PSF ellipticities, which can be modeled well by a simple analytic function based on the lowest-order aberration theory.  Statistical properties of PSF ellipticities originated from the atmospheric turbulence are investigated by using numerical simulation, and it is found that simulation results are in a reasonable agreement with the observed data.  It is also found that the optical PSF can be well corrected by the standard correction method with polynomial fitting function.  However, for the atmospheric PSF, its correction suffers from the common limitation arisen from sparse sampling of PSFs due to a limited number of stars.  Also examine effects of the residual PSF anisotropies on Suprime-Cam cosmic shear data.  Find that the shape and amplitude of B-mode shear variance are broadly consistent with those of the residual PSF ellipticities measured from the dense star field data.  This indicates that most of the sources of residual systematic are understood, which is an important step for cosmic shear statistics to be a practical tool of the precision cosmology.

1304.5017
Small planetesimals in a massive disk formed Mars
Kobayashi, Dauphas

As the titles says.
1304.5062
Exact general relativistic lensing versus thin lens approximation: the crucial role of the void
Mood, Firouzjaee, Mansouri

Study exact GR model structure of gravitational lensing of cosmological structure within a FRW cosmological BG based on LTB metric.  Integration of geodesic equation: Some ranks of Runge-Kutta numerical integrators leads to numerical effects, and is therefore unreliable.  The semi-implicit Rosenbrock method is a viable integration method.  Compare with thin lens approximation.  Show: independent of the NFW truncation details, the thin lens approximation differ substantially from the exact relativistic calculation; the difference in the deflection angle for different impact parameters may be up to about 30 percent.  However, using the modified NFW density profile with a void before going over the FRW background, the thin lens approximation coincides almost exactly with the GR calculation.  [so... FG structure affects halo mass estimates?]