Search Publications
Global Characteristics of Gamma-Ray Bursts Observed with INTEGRAL
McGlynn, S.; McBreen, S.; Foley, S. +5 more
The gamma-ray instruments on board INTEGRAL have detected and localized 62 gamma-ray bursts (GRBs) to date. The peak flux distribution of these bursts shows that INTEGRAL detects proportionally more weak GRBs than Swift because of its higher sensitivity in a smaller field of view. Spectral lags, i.e., the time delay in the arrival of low-energy ga…
The Energy Cascade in Solar Wind MHD Turbulence
Bavassano, B.; Bruno, R.; Carbone, V. +3 more
Direct evidence for the presence of an inertial energy cascade, the most characteristic signature of hydromagnetic turbulence (MHD), is observed in the solar wind by the Ulysses spacecraft. A linear relation is indeed observed for the scaling of mixed third order structure functions involving Elsässer variables. This experimental result, confirmin…
Comment on “Spectral features of SKR observed by Cassini/RPWS: Frequency bandwidth, flux density and polarization” by Patrick Galopeau et al.
Cecconi, B.
Abstract Available from http://www.agu.org
Probing young massive clusters with laser guide star adaptive optics
McCrady, Nate
We use laser guide star adaptive optics (LGS/AO) on the 10 m Keck II telescope to obtain high spatial resolution images of young massive clusters (YMCs) in NGC1569 and M82. These data probe YMC structure and the relation of the YMCs to the ambient field star population. The higher resolution of Keck LGS/AO relative to Hubble Space Telescope/NICMOS…
Stellar clusters in the nuclear regions of AGN with the Advanced Camera for Surveys
Pérez, Enrique; Schmitt, Henrique R.; Cid Fernandes, Roberto +2 more
We explore the role of star clusters in the nuclear regions of galaxies through their connection with active galactic nuclei (AGN). Nuclear star clusters (NCs) are conspicuous in the centers of most nearby galaxies, all along the Hubble sequence. These clusters are probably the faint-end distribution of the central supermassive black holes (SMBHs)…
The Period and the Cause of Variability of the Magnetic Ap Star V473 Tauri
Jerzykiewicz, M.
The ground based UBV observations and Hipparcos Hp magnitudes of this well known magnetic variable are analyzed. The period of the star's light variation is improved. The improved value, accounting for the available photometric data from the 1963--1964 Lowell observations of Rakosch to the 1990--1993 Hp magnitudes, is equal to 1.4068541±0.0000029 …
Field optimization and CCD data simulation for the antarctic International Concordia Explorer Telescope (ICE-T)
Strassmeier, K. G.; Fügner, D.; Fuhrmann, C.
We performed extensive data simulations for the planned ultra-wide-field, high-precision photometric telescope ICE-T (International Concordia Explorer Telescope). ICE-T consists of two 60 cm-aperture Schmidt telescopes with a joint field of view simultaneously in two photometric bandpasses. Two CCD cameras, each with a single 10.3k×10.3k thinned b…
Derivation of fluid conservation relations to infer near-Sun properties of coronal mass ejections from in situ measurements
McComas, D. J.; Riley, Pete
Coronal mass ejections (CMEs) are observed both near the Sun using remote solar measurements, as well as in the solar wind using in situ measurements. While many relationships have been made between these relatively disparate data sets, a number of connections remain poorly known. In this study, we use mass, momentum, and energy conservation to de…
Deep and accurate near-infrared photometry of the Galactic globular cluster omega Cen .
Prada Moroni, P. G.; Degl'Innocenti, S.; Marchetti, E. +17 more
We present deep and accurate Near-Infrared (NIR) photometry of the Galactic Globular Cluster omega Cen . Data were collected using the Multi-Conjugate Adaptive Optics Demonstrator (MAD) mounted on the VLT (ESO). We combined the NIR photometry with optical space data collected with the Advanced Camera for Surveys (ACS) for the same region of the cl…
The solar plasma conditions in the source regions of two explosive events
Wilhelm, K.; Mendoza-Torres, J. E.; Lara, A.
We analyze the ultraviolet emission during two explosive events (EEI and EEII) recorded by SUMER aboard SOHO in the wavelength range from 749 Å to 789 Å. The events occurred near the centre of the solar disk on 17 November 1996. An attempt is made to separate the emission of the primary energy release from that of the accelerated plasma. We want t…