Search Publications
Rotation period of Jupiter from the observation of its magnetic field
Russell, C. T.; Yu, Z. J.
To determine the Jovian internal rotation rate, historically one has used the repetition period (periodicity) of decametric and decimetric radio waves. The period with which decametric and decimetric radio waves recur on Jupiter (the System III period) was defined by the IAU in 1965 to be 9h 55m 29.71s, based on early radio astronomical data. A mo…
Ultraviolet Quasi-Stellar Objects
Bianchi, Luciana; Hutchings, John B.; Bressan, Alessandro +3 more
We present a sample of spectroscopically confirmed quasi-stellar objects (QSOs) with FUV-NUV color (as measured by Galaxy Evolution Explorer (GALEX) photometry, FUV band: 1344-1786 Å, NUV band: 1771-2831 Å) bluer than canonical QSO templates and than the majority of known QSOs. We analyze their FUV to NIR colors, luminosities, and optical spectra.…
Time-Evolution of Peak Energy and Luminosity Relation within Pulses for GRB 061007: Probing Fireball Dynamics
Yamaoka, Kazutaka; Fukazawa, Yasushi; Nakagawa, Yujin E. +3 more
We performed a time-resolved spectral analysis of a bright, long gamma-ray burst GRB 061007 using Suzaku/WAM and Swift/BAT. Because of the large effective area of the WAM, we can investigate the time evolution of the spectral peak energy Etpeak and the luminosity Ltiso with 1-s time resolution, and we fi…
The X-ray eclipse of the dwarf nova HT Cassiopeiae observed by the XMM-Newton satellite: spectral and timing analysis
Guainazzi, M.; Nucita, A. A.; Carpano, S. +5 more
Context: A cataclysmic variable is a binary system consisting of a white dwarf that accretes material from a secondary object via the Roche-lobe mechanism. In the case of long enough observation, a detailed temporal analysis can be performed, allowing the physical properties of the binary system to be determined.
Aims: We present an XMM-Newton…
The first decade of science with Chandra and XMM-Newton
Weisskopf, Martin C.; Schartel, Norbert; Santos-Lleo, Maria +2 more
NASA's Chandra X-ray Observatory and the ESA's X-ray Multi-Mirror Mission (XMM-Newton) made their first observations ten years ago. The complementary capabilities of these observatories allow us to make high-resolution images and precisely measure the energy of cosmic X-rays. Less than 50years after the first detection of an extrasolar X-ray sourc…
Scandium and chromium in the strontium filament in the Homunculus of ηCarinae
Gull, T. R.; Bautista, M. A.; Martínez, M. +4 more
We continue a systematic study of chemical abundances of the strontium filament found in the ejecta of ηCarinae. To this end we interpret the emission spectrum of ScII and CrII using multilevel non-local thermodynamic equilibrium models. Since the atomic data for these ions were previously unavailable, we carry out ab initio calculations of radiat…
The changing look of PKS 2149-306
Tagliaferri, G.; Ghisellini, G.; Pian, E. +8 more
Aims: We study the blazar nature of the high-redshift Flat-Spectrum Radio Quasar PKS 2149-306 (z = 2.345) by investigating its long-term behavior.
Methods: We analyzed all publicly available optical-to-X-ray observations performed by XMM-Newton, Swift, and INTEGRAL.
Results: PKS 2149-306 is one of four blazars at z > 2 that have been ob…
MHD aspect of current sheet oscillations related to magnetic field gradients
Kubyshkin, I. V.; Semenov, V. S.; Erkaev, N. V. +2 more
One-fluid ideal MHD model is applied for description of current sheet flapping disturbances appearing due to a gradient of the normal magnetic field component. The wave modes are studied which are associated to the flapping waves observed in the Earth's magnetotail current sheet. In a linear approximation, solutions are obtained for model profiles…
A planetary eclipse map of CoRoT-2a. Comprehensive lightcurve modeling combining rotational-modulation and transits
Schmitt, J. H. M. M.; Czesla, S.; Wolter, U. +1 more
We analyze the surface structure of the planet host star CoRoT-2a using a consistent model for both the “global” (i.e., rotationally modulated) lightcurve and the transit lightcurves, using data provided by the CoRoT mission. After selecting a time interval covering two stellar rotations and six transits of the planetary companion CoRoT-2b, we hav…
The isolated neutron star RBS1774 revisited. Revised XMM-Newton X-ray parameters and an optical counterpart from deep LBT-observations
Steinmetz, M.; Fontana, A.; Giallongo, E. +12 more
We report optical B-band observations with the Large Binocular Telescope (LBT) of the isolated neutron star RBS1774. The stacked image with a total exposure of 2fh5 reveals a candidate optical counterpart at mB = 26.96 ± 0.20 at position α (2000) = 21^h43^m03fs40, δ(2000) = +06degr54^prime17farcs5, within the joint Chandra and XMM-Newto…