Search Publications
Large-Scale Flows from Orion South
O'Dell, C. R.; Henney, W. J.; Zapata, Luis A. +3 more
Multiple optical outflows are known to exist in the vicinity of the active star formation region called Orion South (Orion-S). We have mapped the velocity of low-ionization features in the brightest part of the Orion Nebula, including Orion-S, and imaged the entire nebula with the Hubble Space Telescope. These new data, combined with recent high-r…
A Changing Solar Shape
Bush, R. I.; Emilio, M.; Kuhn, J. +1 more
The Sun's shape is sensitive to the influence of gravity, rotation, and local turbulence and magnetic fields in its outer atmosphere. A careful measurement of this shape has long been sought to better understand the solar structure and its change during the 11 yr solar cycle. Numerous disparate measurements of the solar oblateness or the fractiona…
A Photometrically Detected Forming Cluster of Galaxies at Redshift 1.6 in the GOODS Field
Fiore, F.; Castellano, M.; Pentericci, L. +9 more
We report the discovery of a localized overdensity at z~1.6 in the GOODS-South field, presumably a poor cluster in the process of formation. The three-dimensional galaxy density has been estimated on the basis of well-calibrated photometric redshifts from the multiband photometric GOODS-MUSIC catalog using the (2+1)-dimensional technique. The dens…
Coronal Magnetic Connectivity and EUV Dimmings
Harra, Louise K.; Wang, Jingxiu; Zhang, Yuzong +3 more
Coronal dimming can be considered to be a disk signature of front-side coronal mass ejections (CMEs) (Thompson et al.: 2000, Geophys. Res. Lett.27, 1431). The study of the magnetic connectivity associated with coronal dimming can shed new light on the magnetic nature of CMEs. In this study, four major flare-CME events on 14 July 2000, 28 October 2…
Characteristics of terrestrial foreshock ULF waves: Cluster observations
RèMe, H.; Nilsson, H.; Walker, S. N. +4 more
ULF waves in the terrestrial foreshock observed simultaneously by the four Cluster satellites were analyzed to identify the plasma wave modes and to study the effect of plasma beta on the intrinsic wave properties. The wave properties in the spacecraft and solar wind frames, such as the wave frequency, total wave number, phase speed, and wave pola…
The dwarf nova SS Cygni: what is wrong?
Schreiber, M. R.; Lasota, J. -P.
Context: Since the Fine Guiding Sensor (FGS) on the Hubble Space Telescope (HST) was used to measure the distance to SS Cyg to be 166±12 pc, it became apparent that at this distance the disc instability model fails to explain the absolute magnitude during outburst. It remained, however, an open question whether the model or the distance have to be…
A Compton-thick active galactic nucleus powering the hyperluminous infrared galaxy IRAS 00182-7112
Nandra, K.; Iwasawa, K.
We present X-ray observations of the hyperluminous infrared galaxy (HLIRG) IRAS 00182- 7112 obtained using the XMM-Newton EPIC camera. A luminous hard X-ray source coincident with the nucleus is revealed, along with weaker soft X-ray emission which may be extended or offset from the hard emission. The EPIC spectrum is extremely flat and shows Fe K…
Measurements of magnetic helicity injected through the solar photosphere
Chae, Jongchul
The amount of magnetic helicity injected into the corona through the photosphere can be measured by inferring the apparent motion of photospheric footpoints of fieldlines from a time series of line-of-sight magnetograms, as originally proposed by [Chae, J., 2001. Observational determination of the rate of magnetic helicity transport through the so…
The Rolis Experiment on the Rosetta Lander
Bibring, Jean-Pierre; Neukum, Gerhard; Jaumann, Ralf +4 more
ROLIS (Rosetta Lander Imaging System) is one of the two imaging systems carried by Rosetta's Lander Philae, successfully launched to comet 67P/ Churyumov-Gerasimenko in March 2004. Consisting of a highly-miniaturized CCD camera, ROLIS will operate as a descent imager, acquiring imagery of the landing site with increasing spatial resolution. After …
Spatial and temporal characteristics of poloidal waves in the terrestrial plasmasphere: a CLUSTER case study
Pierrard, V.; Glassmeier, K. H.; Blomberg, L. G. +3 more
Oscillating magnetic field lines are frequently observed by spacecraft in the terrestrial and other planetary magnetospheres. The CLUSTER mission is a very suitable tool to further study these Alfvén waves as the four CLUSTER spacecraft provide for an opportunity to separate spatial and temporal structures in the terrestrial magnetosphere. Using a…