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Cosmology with the cosmic microwave background temperature-polarization correlation
Couchot, F.; Henrot-Versillé, S.; Perdereau, O. +4 more
We demonstrate that the cosmic microwave background (CMB) temperature-polarization cross-correlation provides accurate and robust constraints on cosmological parameters. We compare them with the results from temperature or polarization and investigate the impact of foregrounds, cosmic variance, and instrumental noise. This analysis makes use of th…
Observation of Three-Dimensional Magnetic Reconnection in the Terrestrial Magnetotail
Xu, Xiaojun; Lapenta, Giovanni; Huang, Shiyong +7 more
Study of magnetic reconnection has been focused on two-dimensional geometry in the past decades, whereas three-dimensional structures and dynamics of reconnection X line are poorly understood. In this paper, we report Cluster multispacecraft observations of a three-dimensional magnetic reconnection X line with a weak guide field ( 25% of the upstr…
Spectroscopy of Very Hot Plasma in Non-flaring Parts of a Solar Limb Active Region: Spatial and Temporal Properties
Teriaca, Luca; Testa, Paola; Petralia, Antonino +4 more
In this work we investigate the thermal structure of an off-limb active region (AR) in various non-flaring areas, as it provides key information on the way these structures are heated. In particular, we concentrate on the very hot component (> 3 {MK}) as it is a crucial element to distinguish between different heating mechanisms. We present an …
Mapping the three-dimensional dust extinction towards the supernova remnant S147 - the S147 dust cloud
Huang, Y.; Chen, B. -Q.; Wang, C. +7 more
We present a three-dimensional (3D) extinction analysis in the region towards the supernova remnant (SNR) S147 (G180.0-1.7) using multiband photometric data from the Xuyi Schmidt Telescope Photometric Survey of the Galactic Anticentre (XSTPS-GAC), 2MASS and WISE. We isolate a previously unrecognized dust structure likely to be associated with SNR …
H I absorption in nearby compact radio galaxies
Sadler, E. M.; Glowacki, M.; Allison, J. R. +6 more
H I absorption studies yield information on both active galactic nucleus (AGN) feeding and feedback processes. This AGN activity interacts with the neutral gas in compact radio sources, which are believed to represent the young or recently re-triggered AGN population. We present the results of a survey for H I absorption in a sample of 66 compact …
Broad-band characteristics of seven new hard X-ray selected cataclysmic variables
Mukai, K.; Israel, G.; de Martino, D. +5 more
We present timing and spectral analysis of a sample of seven hard X-ray selected cataclysmic variable candidates based on simultaneous X-ray and optical observations collected with XMM-Newton, complemented with Swift/BAT and INTEGRAL /IBIS hard X-ray data and ground-based optical photometry. For six sources, X-ray pulsations are detected for the f…
Rosetta photoelectron emission and solar ultraviolet flux at comet 67P
Edberg, N. J. T.; Simon Wedlund, C.; Andersson, L. +10 more
The Langmuir Probe instrument on Rosetta monitored the photoelectron emission current of the probes during the Rosetta mission at comet 67P/Churyumov-Gerasimenko, in essence acting as a photodiode monitoring the solar ultraviolet radiation at wavelengths below 250 nm. We have used three methods of extracting the photoelectron saturation current fr…
Heating of an Erupting Prominence Associated with a Solar Coronal Mass Ejection on 2012 January 27
Moon, Yong-Jae; Reeves, Katharine K.; Raymond, John C. +2 more
We investigate the heating of an erupting prominence and loops associated with a coronal mass ejection and X-class flare. The prominence is seen as absorption in EUV at the beginning of its eruption. Later, the prominence changes to emission, which indicates heating of the erupting plasma. We find the densities of the erupting prominence using the…
Stellar Stream Candidates in the Solar Neighborhood Found in the LAMOST DR3 and TGAS
Oswalt, T. D.; Zhao, G.; Zhang, L. +3 more
We have cross-matched the LAMOST DR3 with the Gaia DR1 TGAS catalogs and obtained a sample of 166,827 stars with reliable kinematics. A technique based on the wavelet transform was applied to detect significant overdensities in velocity space among five subsamples divided by spatial position. In total, 16 significant overdensities of stars with ve…
First detection of hydrogen in the β Pictoris gas disk
Lecavelier des Etangs, A.; Bourrier, V.; Ferlet, R. +6 more
The young and nearby star β Pictoris (β Pic) is surrounded by a debris disk composed of dust and gas known to host a myriad evaporating exocomets, planetesimals and at least one planet. At an edge-on inclination, as seen from Earth, this system is ideal for debris disk studies providing an excellent opportunity to use absorption spectroscopy to st…