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A "breathing" source surface for cycles 23 and 24
Sun, X.; Arden, W. M.; Norton, A. A.
The potential field source surface (PFSS) model is used to represent the large-scale geometry of the solar coronal magnetic fields. The height of the source surface in this model can be taken as a free parameter. Previous work suggests that varying the source surface height during periods of solar minimum yields better agreement between PFSS model…
Three-dimensional Martian ionosphere model: II. Effect of transport processes due to pressure gradients
Forget, F.; Chaufray, J. -Y.; Leblanc, F. +7 more
To study the transport of the ionospheric plasma on Mars, we have included a 3-D multifluid dynamical core in a Martian general circulation model. Vertical transport modifies the ion density above ~160 km on the dayside, especially the ions produced at high altitudes like O+, N+, and C+. Near the exobase, the daysi…
Spectral Energy Distribution Analysis of Class I and Class II FU Orionis Stars
Gramajo, Luciana V.; Gómez, Mercedes; Rodón, Javier A.
FU Orionis stars (FUors) are eruptive pre-main sequence objects thought to represent quasi-periodic or recurring stages of enhanced accretion during the low-mass star-forming process. We characterize the sample of known and candidate FUors in a homogeneous and consistent way, deriving stellar and circumstellar parameters for each object. We emphas…
Constraining supersymmetry using the relic density and the Higgs boson
Rauch, Michael; Plaszczynski, Stéphane; Henrot-Versillé, Sophie +5 more
Recent measurements by Planck, LHC experiments, and Xenon100 have significant impact on supersymmetric models and their parameters. We first illustrate the constraints in the mSUGRA plane and then perform a detailed analysis of the general minimal supersymmetric Standard Model (MSSM) with 13 free parameters. Using SFitter, Bayesian and profile lik…
Information gains from cosmic microwave background experiments
Amara, Adam; Refregier, Alexandre; Seehars, Sebastian +2 more
To shed light on the fundamental problems posed by dark energy and dark matter, a large number of experiments have been performed and combined to constrain cosmological models. We propose a novel way of quantifying the information gained by updates on the parameter constraints from a series of experiments which can either complement earlier measur…
Lens Models of Herschel-selected Galaxies from High-resolution Near-IR Observations
Ivison, R. J.; Clements, D. L.; Scott, D. +39 more
We present Keck-Adaptive Optics and Hubble Space Telescope high resolution near-infrared (IR) imaging for 500 µm bright candidate lensing systems identified by the Herschel Multi-tiered Extragalactic Survey and Herschel Astrophysical Terahertz Large Area Survey. Out of 87 candidates with near-IR imaging, 15 (~17%) display clear near-IR lensi…
The curious time lags of PG 1244+026: discovery of the iron K reverberation lag.
Fabian, A. C.; Uttley, P.; Cackett, E. M. +2 more
High-frequency iron K reverberation lags, where the red wing of the line responds before the line centroid, are a robust signature of relativistic reflection off the inner accretion disc. In this Letter, we report the discovery of the Fe K lag in PG 1244+026 from ∼120 ks of data (one orbit of the XMM-Newton telescope). The amplitude of the lag wit…
A wide search for obscured active galactic nuclei using XMM-Newton and WISE
Alexander, D. M.; Georgakakis, A.; Comastri, A. +8 more
Heavily obscured and Compton-thick active galactic nuclei (AGNs) are missing even in the deepest X-ray surveys, and indirect methods are required to detect them. Here we use a combination of the XMM-Newton serendipitous X-ray survey with the optical Sloan Digital Sky Survey (SDSS), and the infrared WISE all-sky survey in order to check the efficie…
Reflection from the strong gravity regime in a lensed quasar at redshift z = 0.658
Miller, J. M.; Reis, R. C.; Walton, D. J. +1 more
The co-evolution of a supermassive black hole with its host galaxy through cosmic time is encoded in its spin. At z > 2, supermassive black holes are thought to grow mostly by merger-driven accretion leading to high spin. It is not known, however, whether below z ~ 1 these black holes continue to grow by coherent accretion or in a chaotic manne…
Probing cosmic rays in nearby giant molecular clouds with the Fermi Large Area Telescope
Aharonian, Felix; Yang, Rui-zhi; de Oña Wilhelmi, Emma
We report the results of our study of the energy spectra and absolute fluxes of cosmic rays (CRs) in the Local Galaxy based on a five-year γ-ray observation with the Fermi Large Area Telescope (LAT) of eight nearby giant molecular clouds (GMCs) belonging to the Gould Belt. The γ-ray signals obtained with high statistical significance allow the det…