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Propagation of lower-band whistler-mode waves in the outer Van Allen belt: Systematic analysis of 11 years of multi-component data from the Cluster spacecraft
Santolík, Ondřej; Cornilleau-Wehrlin, Nicole; Kolmašová, Ivana +2 more
Lower-band whistler-mode emissions can influence the dynamics of the outer Van Allen radiation belts. We use 11 years of measurements of the STAFF-SA instruments onboard the four Cluster spacecraft to systematically build maps of wave propagation parameters as a function of position. We determine probability distributions of wave vector angle weig…
Wave activities in separatrix regions of magnetic reconnection
Fujimoto, Keizo
Two-dimensional particle-in-cell simulations have reproduced the waves consistent with those observed frequently in the separatrix regions of magnetic reconnection in the Earth's magnetotail. The key process generating the waves is intense parallel acceleration of the electrons due to an electrostatic potential hump formed in the inflow side of th…
Planck constraints on monodromy inflation
Easther, Richard; Flauger, Raphael
We use data from the nominal Planck mission to constrain modulations in the primordial power spectrum associated with monodromy inflation. The largest improvement in fit relative to the unmodulated model has Δχ2 ≈ 10 and we find no evidence for a primordial signal, in contrast to a previous analysis of the WMAP9 dataset, for which Δχ
Asymmetry in the CME-CME Interaction Process for the Events from 2011 February 14-15
Temmer, M.; Veronig, A. M.; Vršnak, B. +1 more
We present a detailed study of the interaction process of two coronal mass ejections (CMEs) successively launched on 2011 February 14 (CME1) and 2011 February 15 (CME2). Reconstructing the three-dimensional shape and evolution of the flux ropes, we verify that the two CMEs interact. The frontal structure of both CMEs, measured along different posi…
The MBH-M* relation for X-ray-obscured, red QSOs at 1.2 < z < 2.6
Magnelli, B.; Maiolino, R.; Schulze, A. +12 more
We present near-infrared (NIR) spectra, obtained with SINFONI and XShooter observations at ESO VLT, of nine dusty, red QSOs at 1.2 < z < 2.6. The sources are hard X-ray detected, characterized by cold absorption (NH > 1021-1022 cm-2) and show a broad Hα component in the NIR spectra. We complemen…
Larger sizes of massive quiescent early-type galaxies in clusters than in the field at 0.8 < z < 1.5
Demarco, R.; Lidman, C.; Tanaka, M. +13 more
We analyse the mass-size relation of ∼400 quiescent massive ETGs (M*/M⊙ > 3 × 1010) hosted by massive clusters (M200 ∼ 2-7 × 1014M⊙) at 0.8 < z < 1.5, compared to those found in the field at the same epoch. Size is parametrized using the mass-normalized B-band rest-frame si…
The stripping of a galaxy group diving into the massive cluster A2142
Rossetti, M.; Paltani, S.; Molendi, S. +7 more
Structure formation in the current Universe operates through the accretion of group-scale systems onto massive clusters. The detection and study of such accreting systems is crucial to understand the build-up of the most massive virialized structures we see today. We report the discovery with XMM-Newton of an irregular X-ray substructure in the ou…
Testing coupled dark energy with large scale structure observation
Yang, Weiqiang; Xu, Lixin
The coupling between the dark components provides a new approach to mitigate the coincidence problem of cosmological standard model. In this paper, dark energy is treated as a fluid with a constant equation of state, whose coupling with dark matter is Q̄=3Hξxρ̄x. In the frame of dark energy, we derive the evolution equations fo…
Tracking the Evolution of a Coherent Magnetic Flux Rope Continuously from the Inner to the Outer Corona
Cheng, X.; Ding, M. D.; Zhang, J. +6 more
The magnetic flux rope (MFR) is believed to be the underlying magnetic structure of coronal mass ejections (CMEs). However, it remains unclear how an MFR evolves into and forms the multi-component structure of a CME. In this paper, we perform a comprehensive study of an extreme-ultraviolet (EUV) MFR eruption on 2013 May 22 by tracking its morpholo…
The Variable Hard X-Ray Emission of NGC 4945 as Observed by NuSTAR
Hailey, Charles J.; Brandt, William N.; Comastri, Andrea +19 more
We present a broadband (~0.5-79 keV) spectral and temporal analysis of multiple NuSTAR observations combined with archival Suzaku and Chandra data of NGC 4945, the brightest extragalactic source at 100 keV. We observe hard X-ray (>10 keV) flux and spectral variability, with flux variations of a factor of two on timescales of 20 ks. A variable p…