Search Publications
Tailward flow of energetic neutral atoms observed at Venus
Kallio, E.; Barabash, S.; Gunell, H. +7 more
The Analyzer of Space Plasma and Energetic Atoms (ASPERA-4) experiment on Venus Express provides the first measurements of energetic neutral atoms (ENAs) from Venus. The results improve our knowledge on the interaction of the solar wind with a nonmagnetized planet and they present an observational constraint to existing plasma models. We character…
A Lyman Break Galaxy Candidate at z ~ 9
Teplitz, Harry I.; Siana, Brian; Malkan, Matthew A. +3 more
We report the discovery of a z ~ 9 Lyman break galaxy candidate, selected from the NICMOS Parallel Imaging Survey as a J-dropout with J110 - H160 = 1.7. Spitzer/IRAC photometry reveals that the galaxy has a blue H160 - 3.6 µm color and a spectral break between 3.6 and 4.5 µm. We interpret this break as …
Reconstruction of Cluster Masses Using Particle Based Lensing. I. Application to Weak Lensing
Goldberg, David M.; Deb, Sanghamitra; Ramdass, Vede J.
We present Particle Based Lensing (PBL), a new technique for gravitational lensing mass reconstructions of galaxy clusters. Traditionally, most methods have employed either a finite inversion or gridding to turn observational lensed galaxy ellipticities into an estimate of the surface mass density of a galaxy cluster. We approach the problem from …
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…