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Contemporaneous Broadband Observations of Three High-redshift BL LAC Objects
Troja, E.; Caraveo, P. A.; Mirabal, N. +101 more
We have collected broadband spectral energy distributions (SEDs) of three BL Lac objects 3FGL J0022.1-1855 (z = 0.689), 3FGL J0630.9-2406 (z\quad ≳ 1.239), and 3FGL J0811.2-7529 (z = 0.774), detected by Fermi with relatively flat gigaelectronvolt spectra. By observing simultaneously in the near-infrared to hard X-ray band, we can well characterize…
Variation of the temperature gradient in the solar photosphere with magnetic activity
Faurobert, M.; Ricort, G.; Balasubramanian, R.
Context. The contribution of quiet-Sun regions to the solar irradiance variability is currently unclear. Some solar-cycle variations of the quiet-Sun physical structure, such as the temperature gradient or the photospheric radius, might affect the irradiance.
Aims: We intend to investigate possible variations of the photospheric temperature g…
Surrogate-assisted network analysis of nonlinear time series
Laut, Ingo; Räth, Christoph
The performance of recurrence networks and symbolic networks to detect weak nonlinearities in time series is compared to the nonlinear prediction error. For the synthetic data of the Lorenz system, the network measures show a comparable performance. In the case of relatively short and noisy real-world data from active galactic nuclei, the nonlinea…
Two interacting X lines in magnetotail: Evolution of collision between the counterstreaming jets
Retinò, Alessandro; Nakamura, Rumi; Nakamura, Takuma +5 more
We study the process of collision between the counterstreaming jets flowing out from two reconnection sites in the Earth's magnetotail. The X lines, bracketing the region of jets collision, were passing by two Cluster probes successively in tailward direction. Two probes observed two different stages of the collision process. At the jets collision…
Confirmation of the magnetic nature of the delta Scuti star HD 21190
Hubrig, S.; Scholler, M.
HD 21190 is a known delta Scuti star showing Ap star characteristics and a variability period of 3.6h discovered by the Hipparcos mission. Our previous spectropolarimetric observations with FORS1 at the VLT showed the presence of a rather weak magnetic field of the order of a few tens of Gauss. New spectropolarimetric measurements with FORS2 at th…
A Statistical Study of the Plasma Sheet in the Near and Middle Earth Magnetotail
Pu, Zu-Yin; Fu, Sui-Yan; Shi, Quan-Qi +5 more
Magnetotail plasma sheet is the most active area in Earth's magnetosphere. It has been found that the features of plasma sheet are controlled by the conditions of solar wind and Interplanetary Magnetic Field (IMF). Some previous statistical studies have found that some parameters of the plasma sheet are dawn-dusk asymmetric. But the thickness of t…
Digging process in NGC 6951: the molecular disc bumped by the jet
Ricci, T. V.; Steiner, J. E.; May, D. +2 more
We present a study of the central 200 pc of the galaxy NGC 6951, SAB(rs)bc, an active twin of the Milky Way, at a distance of 24 Mpc. Its nucleus has been observed in the optical with the Integral Field Unit of the Gemini Multi-Object Spectrograph, showing an outflow, and with the HST/ACS, revealing two extended structures with similar orientation…
New insights into the quasi-periodic X-ray burster GS 0836-429
Sánchez-Fernández, C.; Kuulkers, E.; Aranzana, E.
GS 0836-429 is a neutron star X-ray transient that displays Type-I X-ray bursts. In 2003 and 2004 it experienced two outbursts in X-rays. We present here an analysis of the system's bursting properties during these outbursts. We studied the evolution of the 2003-2004 outbursts in soft X-rays using RXTE (2.5-12 keV; ASM) and in hard X-rays with INT…
The Philae Lander: Science planning and operations
Bibring, Jean-Pierre; Jurado, Eric; Ulamec, Stephan +13 more
Rosetta is an ambitious mission launched in March 2004 to study comet 67P/Churyumov-Gerasimenko. It is composed of a space probe (Rosetta) and the Philae Lander. The mission is a series of premieres: among others, first probe to escort a comet, first time a landing site is selected with short turnaround time, first time a lander has landed on a co…
Pseudomagnitude distances: Application to the Pleiades cluster
Duvert, G.; Chelli, A.
The concept of pseudomagnitude has recently been introduced to estimate apparent stellar diameters using a strictly observational methodology. Pseudomagnitudes are distance indicators which have the remarkable property of being reddening free. In this study, we use Hipparcos parallax measurements to compute the mean absolute pseudomagnitudes of so…