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Role of projection effects on solar coronal mass ejection properties: 1. A study of CMEs associated with limb activity
St. Cyr, O. C.; Stanger, A. L.; Burkepile, J. T. +2 more
Many properties of Coronal Mass Ejections (CMEs), such as size, location and brightness, have been determined from measurements of white light coronal observations. We expect the average properties derived from these measurements contain systematic inaccuracies due to projection effects and suggest that CME properties are most accurately determine…
Subgalactic Clumps at High Redshift: A Fragmentation Origin?
Gerhard, Ortwin; Westera, Pieter; Immeli, Andreas +1 more
We investigate the origin of the clumpy structures observed at high redshift, such as chain galaxies. We use a three-dimensional chemodynamical simulation describing the dynamics of stars and a two-phase interstellar medium, as well as feedback processes from the stars. For high efficiency of energy dissipation in the cold cloud medium, the initia…
Solar magnetic elements at 0.1 arcsec resolution. General appearance and magnetic structure
Hansteen, V. H.; Carlsson, M.; Berger, T. E. +6 more
New observations of solar magnetic elements in a remnant active region plage near disk center are presented. The observations were obtained at the recently commissioned Swedish 1-m Solar Telescope on La Palma. We examine a single 430.5 nm G-band filtergram that resolves ∼70 km (0.1 arcsec) structures and find new forms of magnetic structures in th…
Discovery of Hard Nonthermal Pulsed X-Ray Emission from the Anomalous X-Ray Pulsar 1E 1841-045
Kuiper, L.; Hermsen, W.; Mendez, M.
We report the discovery of nonthermal pulsed X-ray/soft gamma-ray emission up to ~150 keV from the anomalous 11.8 s X-ray pulsar AXP 1E 1841-045 located near the center of supernova remnant Kes 73 using Rossi X-Ray Timing Explorer (RXTE) Proportional Counter Array and High Energy X-Ray Timing Experiment (HEXTE) data. The morphology of the double-p…
Kinematics of coronal mass ejections between 2 and 30 solar radii. What can be learned about forces governing the eruption?
Vršnak, B.; Gopalswamy, N.; Sudar, D. +1 more
Kinematics of more than 5000 coronal mass ejections (CMEs) measured in the distance range 2-30 solar radii is investigated. A distinct anticorrelation between the acceleration, a, and the velocity, v, is found. In the linear form, it can be represented as a=-k1(v-v0), where v0=400 km s-1, i.e., most of C…
Hubble Space Telescope Imaging and Keck Spectroscopy of z ~ 6 i-Band Dropout Galaxies in the Advanced Camera for Surveys GOODS Fields
Treu, Tommaso; Bunker, Andrew J.; McMahon, Richard G. +3 more
We measure the surface density of i'-band dropout galaxies at z~6 through wide-field Hubble Space Telescope (HST) Advanced Camera for Surveys (ACS) imaging and ultradeep Keck DEIMOS spectroscopy. Using deep HST ACS SDSS i' (F775W) and SDSS z' (F850LP) imaging from the Great Observatories Origins Deep Survey-North (GOODS-N 200 arcmin2), …
New perspectives on Titan's upper atmosphere from a reanalysis of the Voyager 1 UVS solar occultations
Strobel, Darrell F.; Vervack, Ronald J.; Sandel, Bill R.
We have reanalyzed the Voyager 1 UVS solar occultations by Titan to expand upon previous analyses and to resolve inconsistencies that have been noted in the scientific literature. To do so, we have developed a detailed model of the UVS detector and improved both the data reduction methods and retrieval techniques. In comparison to the values previ…
The Relationship Between Black Hole Mass and Velocity Dispersion in Seyfert 1 Galaxies
Green, Richard F.; Gebhardt, Karl; Bower, Gary +2 more
Black hole masses in active galactic nuclei are difficult to measure using conventional dynamical methods but can be determined using the technique of reverberation mapping. However, it is important to verify that the results of these different methods are equivalent. This can be done indirectly, using scaling relations between the black hole and …
The European Large-Area ISO Survey (ELAIS): the final band-merged catalogue
Elbaz, D.; Genzel, R.; Pozzi, F. +76 more
We present the final band-merged European Large-Area ISO Survey (ELAIS) Catalogue at 6.7, 15, 90 and 175 µm, and the associated data at U, g', r', i', Z, J, H, K and 20 cm. The origin of the survey, infrared and radio observations, data-reduction and optical identifications are briefly reviewed, and a summary of the area covered and the comp…
Arp 299: A Second Merging System with Two Active Nuclei?
Maraschi, L.; Ballo, L.; Tavecchio, F. +3 more
Recent BeppoSAX observations of Arp 299, a powerful far-IR merging starburst system composed of IC 694 and NGC 3690, clearly unveiled for the first time in this system the presence of a strongly absorbed active galactic nucleus (AGN). However, the system was not spatially resolved by BeppoSAX. Here we present the analysis of archival Chandra and (…