Search Publications
Planck 2013 results. II. Low Frequency Instrument data processing
Bernard, J. -P.; Planck Collaboration; Aghanim, N. +229 more
We describe the data processing pipeline of the Planck Low Frequency Instrument (LFI) data processing centre (DPC) to create and characterize full-sky maps based on the first 15.5 months of operations at 30, 44, and 70 GHz. In particular, we discuss the various steps involved in reducing the data, from telemetry packets through to the production o…
Solar Dynamics Observatory and Hinode Observations of a Blowout Jet in a Coronal Hole
Young, P. R.; Muglach, K.
A blowout jet occurred within the south coronal hole on 9 February 2011 at 09:00 UT and was observed by the Atmospheric Imaging Assembly (AIA) and Helioseismic and Magnetic Imager (HMI) onboard the Solar Dynamics Observatory, and by the EUV Imaging Spectrometer (EIS) and X-Ray Telescope (XRT) onboard the Hinode spacecraft during coronal-hole monit…
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…