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New XMM-Newton Analysis of Three Bright X-Ray Sources in M31 Globular Clusters, Including a New Black Hole Candidate
Stiele, H.; Pietsch, W.; Haberl, F. +6 more
We present a detailed analysis of three globular cluster X-ray sources in the XMM-Newton extended survey of M31. The X-ray counterpart to the M31 globular cluster Bo 45 (XBo 45) was observed with XMM-Newton on 2006 December 26. Its combined pn+MOS 0.3-10 keV light curve was seen to vary by ~10%, and its 0.3-7.0 keV emission spectrum was well descr…
Asiago eclipsing binaries program. II. V505 Persei
Munari, U.; Zwitter, T.; Sordo, R. +4 more
The orbit and fundamental physical parameters of the double-lined eclipsing binary V505 Per are derived by means of Echelle high-resolution and high S/N spectroscopy, and B, V photometry. In addition, effective temperatures, gravities, rotational velocities, and metallicities of both components are also obtained from atmospheric χ2 anal…
Energetic electron signatures of Saturn's smaller moons: Evidence of an arc of material at Methone
Krupp, N.; Woch, J.; Jones, G. H. +6 more
We present several energetic charged particle microsignatures of two Lagrange moons, Telesto and Helene, measured by the MIMI/LEMMS instrument. These small moons absorb charged particles but their effects are usually obscured by Tethys and Dione, the two larger saturnian satellites that occupy the same orbits. The scales and structures of these mi…
Lorentz Force: A Possible Driving Force for Sunspot Rotation
Zhang, Hongqi; Liu, Yu; Li, Hui +5 more
Zhao and Kosovichev (Astrophys. J.591, 446, 2003) found two opposite sub-photospheric vortical flows in the depth range of 0 - 12 Mm around a fast rotating sunspot. So far there is no theoretical model explaining such flow motions. In this paper, we try to explain this phenomenon from the point of view of magnetic flux tubes interacting with large…
The in-flight performance of the X-ray Solar Monitor (XSM) on-board SMART-1
Andersson, H.; Alha, L.; Huovelin, J. +4 more
The operation, performance, and in-flight calibrations of the X-ray Solar Monitor (XSM) on-board ESA's SMART-1 mission to the Moon are presented. The basic method of deriving the response and effective area of the XSM is described. The evolution of the energy resolution as a function of time is studied, and sample data of high quality broadband so…
Diverse young stellar populations in the intermediate-redshift radio galaxies 3C 213.1 and 3C 459: implications for the evolution of the host galaxies
Morganti, R.; Inskip, K. J.; Holt, J. +4 more
We present European Southern Observatory Very Large Telescope (ESO VLT) and William Herschel Telescope (WHT) spectroscopic observations of two powerful radio galaxies at intermediate redshifts (3C 213.1 and 3C 459), obtained with the aim of establishing the nature and evolutionary status of the host galaxies. Spectral synthesis modelling has been …
Observations of a comet tail disruption induced by the passage of a CME
Webb, D. F.; Arge, C. N.; Tappin, S. J. +7 more
The Solar Mass Ejection Imager observed an extremely faint interplanetary coronal mass ejection (ICME) as it passed Comet C/2001 Q4 (NEAT) on 5 May 2004, apparently causing a disruption of its plasma tail. This is the first time that an ICME has been directly observed interacting with a comet. SMEI's nearly all-sky coverage and image cadence affor…
HE 1113-0641: The Smallest-Separation Quadruple Lens Identified by a Ground-Based Optical Telescope
Wisotzki, Lutz; Schechter, Paul L.; Blackburne, Jeffrey A.
The Hamburg/ESO quasar HE 1113-0641 is found to be a quadruple gravitational lens, based on observations with the twin 6.5 m Magellan telescopes at the Las Campanas Observatory, and subsequently with the Hubble Space Telescope. The zS = 1.235 quasar appears in a cross configuration, with i' band magnitudes ranging from 18.0 to 18.8. Wit…
The central region of M83
Houghton, R. C. W.; Thatte, N.
We combine VLT/ISAAC near-infrared (NIR) spectroscopy with archival HST/WFPC2 and HST/NICMOS imaging to study the central 20 × 20arcsec2 of M83. Our NIR indices for clusters in the circumnuclear starburst region are inconsistent with simple instantaneous burst models. However, models of a single burst dispersed over a duration of 6 Myr …
The lower exosphere of Titan: Energetic neutral atoms absorption and imaging
Krupp, N.; Dandouras, I.; Garnier, P. +8 more
The Saturn magnetosphere interacts with the Titan atmosphere through various mechanisms. One of them leads, by charge exchange reactions between the energetic Saturnian ions and the exospheric neutrals of Titan, to the production of energetic neutral atoms (ENAs). The Ion and Neutral Camera (INCA), one of the three sensors that comprise the Magnet…