Search Publications
Solar periodicity in energetic ions at Saturn
Mitchell, D. G.; Roelof, E. C.; Carbary, J. F. +1 more
Energetic protons (2.8-78 keV) and water group ions (8.8-78 keV) observed in Saturn's magnetosphere using the Magnetospheric Imaging Instrument/Charge-Energy-Mass Spectrometer instrument from 2005 through 2012 were subjected to a Lomb periodogram analysis with the period window extending from 0.5 to 50 days, and the data constrained to the spatial…
Numerical simulations of wind-equatorial gas interaction in η Carinae
Soker, Noam; Tsebrenko, Danny; Akashi, Muhammad
We perform 3D gas-dynamical simulations and show that the asymmetric morphology of the blue- and red-shifted components of the outflow at hundreds of astronomical units from the massive binary system η Carinae can be accounted for from the collision of the free primary stellar wind with the slowly expanding dense equatorial gas. Owing to the very …
Filter-induced Bias in Lyα Emitter Surveys: A Comparison between Standard and Tunable Filters. Gran Telescopio Canarias Preliminary Results
Cepa, J.; Bongiovanni, A.; González-Serrano, J. I. +4 more
Lyα emitter (LAE) surveys have successfully used the excess in a narrowband filter compared to a nearby broadband image to find candidates. However, the odd spectral energy distribution (SED) of LAEs combined with the instrumental profile has important effects on the properties of the candidate samples extracted from these surveys. We investigate …
Comparison between magnetic coplanarity and MVA methods in determining the normal of Venusian bow shock
Wang, Shui; Huang, Can; Zhang, TieLong +4 more
With the measurements of magnetic field of Venus Express (VEX), magnetic coplanarity and minimum variance analysis (MVA) methods are analyzed and their validity is tested to determine the normal of Venusian bow shocks. It is found that MVA method is the better than magnetic coplanarity, and 95% shock crossings can be accurately determined by the m…
Differential Proper-motion Measurements of the Cygnus Egg Nebula: The Presence of Equatorial Outflows
Ueta, Toshiya; Tomasino, Rachael L.; Ferguson, Brian A.
We present the results of differential proper-motion analyses of the Egg Nebula (RAFGL 2688, V1610 Cyg) based on the archived two-epoch optical data taken with the Hubble Space Telescope. First, we determined that the polarization characteristics of the Egg Nebula are influenced by the higher optical depth of the central regions of the nebula (i.e…
Spectral Energy Distribution in the symbiotic system BI Cru
Cidale, L. S.; Brandi, E.; Muratore, M. F. +1 more
BI Crucis is a symbiotic star classed as a D-type (dusty). It comprises a Mira variable; a hot compact object and a large bipolar nebula. We model the continuum spectral energy distribution of this star in a wide range of wavelengths. We derive its fundamental parameters using a theoretical model developed by zorec-1998 (Proceedings of the Paris w…
XMM-Newton discovery of transient 285.4 s X-ray pulsar XMMU J013359.5+303634 in M33
Trudolyubov, S. P.
I report on the discovery and analysis of the first transient X-ray pulsar detected in the Local Group galaxy M33. The 2010 July-August deep XMM-Newton observations of M33 fields revealed a new bright X-ray source XMMU J013359.5+303634 exhibiting pulsations with a period P ∼ 285.4 s and pulsed fraction ∼47 per cent in the 0.3-10 keV energy range. …
Some aspects of modelling the high-latitude ionospheric convection from Cluster/Edi data
Haaland, S. E.; Förster, M.; Gromova, L. I. +3 more
Measurements onboard Cluster satellites are briefly described, which form the base for determining the intensity and direction of the electric field in the magnetosphere. The aim of this paper is to describe (1) the methodology of calculating the potential distribution at the ionospheric level and the results of constructing spatiotemporal convect…
Detection of a 522 s Pulsation from the Transient X-Ray Source Suzaku J0102.8-7204 (SXP 523) in the Small Magellanic Cloud
Miller, Eric D.; Tsujimoto, Masahiro; Wada, Qazuya +1 more
During a routine calibration observation of 1E 0102.2-7219 in the Small Magellanic Cloud (SMC), carried out in 2012 October for the Suzaku satellite, we detected a transient X-ray source at (RA, Dec) = (01h 02m47s, - 72°04m54s) in the equinox J2000.0 with a positional uncertainty of ∼1.4". We …
Searching for evidence of jet-cloud interaction in radio galaxies. First results for 3C 381
Feinstein, C.; Reynaldi, V.
We present results of Gemini spectroscopy and Hubble Space Telescope imaging of the 3C 381 radio galaxy. Possible ionizing mechanisms for the extended emission-line region were studied through state-of-the-art diagnostic analysis employing line ratios. Photoionization from the central engine as well as mixed medium photoionization models fail in r…