Search Publications
Multiscale estimation of the field-aligned current density
Vogt, Joachim; Marghitu, Octav; Bunescu, Costel +1 more
Field-aligned currents (FACs) in the magnetosphere-ionosphere (M-I) system exhibit a range of spatial and temporal scales that are linked to key dynamic coupling processes. To disentangle the scale dependence in magnetic field signatures of auroral FACs and to characterize their geometry and orientation, Bunescu et al. (2015) introduced the multis…
Multivariate Time-series Analysis of Variable Objects in the Gaia Mission
Bouchy, Francois; Holl, Berry; Rimoldini, Lorenzo +5 more
In astronomy, we are witnessing an enormous increase in the number of source detections, precision, and diversity of measurements. Additionally, multi-epoch data is becoming the norm, making time-series analyses an important aspect of current astronomy. The Gaia mission is an outstanding example of a multi-epoch survey that provides measurements i…
Long-term X-ray variation of the colliding-wind Wolf-Rayet binary WR 125
Sugawara, Yasuharu; Ebisawa, Ken; Midooka, Takuya
WR 125 is considered to be a colliding-wind Wolf-Rayet binary (CWWB), from which the most recent infrared flux increase was reported between 1990 and 1993. We observed the object four times from 2016 November to 2017 May with Swift and XMM-Newton, and carried out a precise X-ray spectral study for the first time. There were hardly any changes in t…
SIMBIO-SYS/STC stereo camera calibration: Geometrical distortion
Da Deppo, Vania; Slemer, Alessandra; Amoroso, Marilena +10 more
The STereo imaging Channel (STC) is the first push-frame stereo camera on board an European Space Agency (ESA) satellite, i.e., the ESA-Japan Aerospace eXploration Agency mission BepiColombo. It was launched in October 2018, and it will reach its target, Mercury, in 2025. The STC main aim is to provide the global three-dimensional reconstruction o…
Spectral properties of gamma-ray bursts observed by the Suzaku wide-band all-sky monitor
Yamaoka, Kazutaka; Fukazawa, Yasushi; Kokubun, Motohide +17 more
We have systematically studied the spectral properties of 302 localized gamma-ray bursts (GRBs) observed by the Suzaku wide-band all-sky monitor (WAM) from 2005 August to 2010 December. The energy spectra in the 100-5000 keV range integrated over the entire emission and the 1 s peak were fitted by three models: a single power law, a power law with…
Possible Electromagnetic Manifestations of Merging Black Holes
Bisikalo, D. V.; Zhilkin, A. G.; Kurbatov, E. P.
The scenario of a merger of two black holes surrounded by an accretion disk is considered. As a result of the emission of gravitational waves, the mass of the central object decreases, and the accretion disk is perturbed. Computational results show that the main consequence of this perturbation is the formation of a shock propagating from the cent…
A Carbon-rich Hot Bubble in the Planetary Nebula NGC 5189
Karovska, Margarita; Toalá, Jesús A.; Montez, Rodolfo, Jr.
We present the discovery of extended X-ray emission from the planetary nebula (PN) NGC 5189 around the [WO1]-type WD 1330-657 with XMM-Newton. The X-ray-emitting gas fills the cavities detected in the Hubble Space Telescope [O III] narrowband image and presents a limb-brightened morphology toward the outer edges of the east and west lobes. The bul…
Radio-optical galaxy shape and shear correlations in the COSMOS field using 3 GHz VLA observations
Brown, Michael L.; Harrison, Ian; Hillier, Tom +1 more
We present a weak-lensing analysis of the 3 GHz Very Large Array radio survey of the COSMOS field, which we correlate with overlapping Hubble Space Telescope-Advanced Camera for Survey optical observations using both intrinsic galaxy shape and cosmic shear correlation statistics. After cross-matching sources between the two catalogues, we measure …
Microquasar V404 Cyg /GS 2023+338: MASTER optical observations during the June and December 2015 super-outbursts
Rebolo, R.; Wang, X.; Buckley, D. A. H. +22 more
We present several thousands homogeneous photometric (WBVRI and polarization) observations of the microquasar black hole binary V404 Cyg, obtained by the MASTER Global Robotic Network (Lipunov et al. 2010). MASTER were the first telescopes to optically monitor the microquasar after its gamma-ray onset from 18 h 34 m 09 s UT on June 15, 2015 (), un…
Testing Seismic Models of Hot B Subdwarfs with Gaia Data
Latour, M.; Green, E. M.; Fontaine, G. +5 more
We report the results of a study designed to test further the basic validity of the seismic models of hot pulsating B subdwarfs that have been developed over the last two decades. Given estimates of the effective temperature, surface gravity, and mass as obtained from a seismic analysis, and given an estimate of the He/H ratio as available from in…