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Cosmic microwave background reconstruction from WMAP and Planck PR2 data
Starck, J. -L.; Sureau, F.; Bobin, J.
We describe a new estimate of the cosmic microwave background (CMB) intensity map reconstructed by a joint analysis of the full Planck 2015 data (PR2) and nine years of WMAP data. The proposed map provides more than a mere update of the CMB map introduced in a previous paper since it benefits from an improvement of the component separation method …
A Three-dimensional Model of Active Region 7986: Comparison of Simulations with Observations
Downs, Cooper; Linker, Jon A.; Mikić, Zoran +2 more
In the present study, we use a forward modeling method to construct a 3D thermal structure encompassing active region 7986 of 1996 August. The extreme ultraviolet (EUV) emissions are then computed and compared with observations. The heating mechanism is inspired by a theory on Alfvén wave turbulence dissipation. The magnetic structure is built fro…
Dione and Rhea seasonal exospheres revealed by Cassini CAPS and INMS
Waite, J. H.; Teolis, B. D.
A Dione O2 and CO2 exosphere of similar composition and density to Rhea's is confirmed by Cassini spacecraft Ion Neutral Mass Spectrometer (INMS) flyby data. INMS results from three Dione and two Rhea flybys show exospheric spatial and temporal variability indicative of seasonal exospheres, modulated by winter polar gas adsor…
A variable ULX and possible IMBH candidate in M51a
Done, Chris; Middleton, Matthew J.; Sutton, Andrew D. +7 more
Ultraluminous X-ray source (ULX)-7, in the northern spiral arm of M51, demonstrates unusual behaviour for an ULX, with a hard X-ray spectrum but very high short-term variability. This suggests that it is not in a typical ultraluminous state. We analyse the source using archival data from XMM-Newton, Chandra and NuSTAR, and by examining optical and…
Information gains from cosmological probes
Amara, A.; Refregier, A.; Grandis, S. +2 more
In light of the growing number of cosmological observations, it is important to develop versatile tools to quantify the constraining power and consistency of cosmological probes. Originally motivated from information theory, we use the relative entropy to compute the information gained by Bayesian updates in units of bits. This measure quantifies …
The binary populations of eight globular clusters in the outer halo of the Milky Way
Milone, A. P.; Marino, A. F.; Bedin, L. R. +6 more
We analyse colour-magnitude diagrams of eight globular clusters (GCs) in the outer Galactic halo. Images were taken with the Wide Field Channel of the Advanced Camera for Survey and the Ultraviolet and Visual Channel of the Wide Field Camera 3 on board of the Hubble Space Telescope. We have determined the fraction of binary stars along the main se…
Constraining multiplicative bias in CFHTLenS weak lensing shear data
Hill, J. Colin; Liu, Jia; Ortiz-Vazquez, Alvaro
Several recent cosmological analyses have found tension between constraints derived from the Canada-France-Hawaii Telescope Lensing Survey (CFHTLenS) data and those derived from other data sets, such as the Planck cosmic microwave background (CMB) temperature anisotropies. Similarly, a direct cross-correlation of the CFHTLenS data with Planck CMB …
Tether-cutting Reconnection between Two Solar Filaments Triggering Outflows and a Coronal Mass Ejection
Zhang, Jun; Li, Leping; Chen, Huadong +1 more
Triggering mechanisms of solar eruptions have long been a challenge. A few previous case studies have indicated that preceding gentle filament merging via magnetic reconnection may launch following intense eruption, according to the tether-cutting (TC) model. However, the detailed process of TC reconnection between filaments has not been exhibited…
Ion Dynamics at a Rippled Quasi-parallel Shock: 2D Hybrid Simulations
Wang, Shui; Hao, Yufei; Lu, Quanming +1 more
In this paper, two-dimensional hybrid simulations are performed to investigate ion dynamics at a rippled quasi-parallel shock. The results show that the ripples around the shock front are inherent structures of a quasi-parallel shock, and the re-formation of the shock is not synchronous along the surface of the shock front. By following the trajec…
The Distribution of Mass Surface Densities in a High-mass Protocluster
Kainulainen, Jouni; Tan, Jonathan C.; Lim, Wanggi +2 more
We study the probability distribution function (PDF) of mass surface densities, Σ, of infrared dark cloud (IRDC) G028.37+00.07 and its surrounding giant molecular cloud. This PDF constrains the physical processes, such as turbulence, magnetic fields, and self-gravity, that are expected to be controlling cloud structure and star formation activity.…