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Planck intermediate results. XX. Comparison of polarized thermal emission from Galactic dust with simulations of MHD turbulence
Kneissl, R.; Miville-Deschênes, M. -A.; Boulanger, F. +186 more
Polarized emission observed by Planck HFI at 353 GHz towards a sample of nearby fields is presented, focusing on the statistics of polarization fractions p and angles ψ. The polarization fractions and column densities in these nearby fields are representative of the range of values obtained over the whole sky. We find that: (i) the largest polariz…
The Atmospheric Circulation of the Hot Jupiter WASP-43b: Comparing Three-dimensional Models to Spectrophotometric Data
Fortney, Jonathan J.; Stevenson, Kevin B.; Kataria, Tiffany +5 more
The hot Jupiter WASP-43b (2 MJ , 1 RJ , T orb = 19.5 hr) has now joined the ranks of transiting hot Jupiters HD 189733b and HD 209458b as an exoplanet with a large array of observational constraints. Because WASP-43b receives a similar stellar flux as HD 209458b but has a rotation rate four times faster and a highe…
Ultra-large-scale Cosmology in Next-generation Experiments with Single Tracers
Alonso, David; Maartens, Roy; Bull, Philip +2 more
Future surveys of large-scale structure will be able to measure perturbations on the scale of the cosmological horizon, and so could potentially probe a number of novel relativistic effects that are negligibly small on sub-horizon scales. These effects leave distinctive signatures in the power spectra of clustering observables and, if measurable, …
Metamorphosis of SN 2014C: Delayed Interaction between a Hydrogen Poor Core-collapse Supernova and a Nearby Circumstellar Shell
Fransson, C.; Challis, P.; Kirshner, R. P. +19 more
We present optical observations of supernova SN 2014C, which underwent an unprecedented slow metamorphosis from H-poor type Ib to H-rich type IIn over the course of one year. The observed spectroscopic evolution is consistent with the supernova having exploded in a cavity before encountering a massive shell of the progenitor star’s stripped hydrog…
Large-scale filaments associated with Milky Way spiral arms
Ginsburg, Adam; Wang, Ke; Testi, Leonardo +3 more
The ubiquity of filamentary structure at various scales throughout the Galaxy has triggered a renewed interest in their formation, evolution, and role in star formation. The largest filaments can reach up to Galactic scale as part of the spiral arm structure. However, such large-scale filaments are hard to identify systematically due to limitation…
Large-scale Globally Propagating Coronal Waves
Warmuth, Alexander
Large-scale, globally propagating wave-like disturbances have been observed in the solar chromosphere and by inference in the corona since the 1960s. However, detailed analysis of these phenomena has only been conducted since the late 1990s. This was prompted by the availability of high-cadence coronal imaging data from numerous spaced-based instr…
Suppression of Star Formation in NGC 1266
Meier, David S.; Chang, Philip; Martín, Sergio +11 more
NGC 1266 is a nearby lenticular galaxy that harbors a massive outflow of molecular gas powered by the mechanical energy of an active galactic nucleus (AGN). It has been speculated that such outflows hinder star formation (SF) in their host galaxies, providing a form of feedback to the process of galaxy formation. Previous studies, however, indicat…
Constraint on neutrino masses from SDSS-III/BOSS Lyα forest and other cosmological probes
Ross, Nicholas P.; Borde, Arnaud; Palanque-Delabrouille, Nathalie +11 more
We present constraints on the parameters of the ΛCDM cosmological model in the presence of massive neutrinos, using the one-dimensional Lyα forest power spectrum obtained with the Baryon Oscillation Spectroscopic Survey (BOSS) of the Sloan Digital Sky Survey (SDSS) by Palanque-Delabrouille et al. [1], complemented by additional cosmological probes…
Non-detection of X-ray emission from sterile neutrinos in stacked galaxy spectra
Bregman, Joel N.; Churazov, Eugene; Anderson, Michael E.
We conduct a comprehensive search for X-ray emission lines from sterile neutrino dark matter, motivated by recent claims of unidentified emission lines in the stacked X-ray spectra of galaxy clusters and the centres of the Milky Way and M31. Since the claimed emission lines lie around 3.5 keV, we focus on galaxies and galaxy groups (masking the ce…
First Frontier Field Constraints on the Cosmic Star Formation Rate Density at z ∼ 10—The Impact of Lensing Shear on Completeness of High-redshift Galaxy Samples
Trenti, M.; Oesch, P. A.; Bouwens, R. J. +5 more
We search the complete Hubble Frontier Field data set of Abell 2744 and its parallel field for z∼ 10 sources to further refine the evolution of the cosmic star formation rate density (SFRD) between z∼ 8 and z∼ 10. We independently confirm two images of the recently discovered triply imaged z∼ 9.8 source by Zitrin et al. and set an upper limit for …