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Mechanical disturbances in Fourier spectrometers
Formisano, Vittorio; Saggin, Bortolino; Comolli, Lorenzo
Fourier spectrometers are sensitive to many kinds of disturbance. This focus is mainly on those connected to mechanical vibrations, assessing the relationships between the mechanical inputs and the deriving effects on the spectra. Mechanical vibrations have two main effects on the spectra, the addition of signals due to direct sensitivity to vibra…
Density Dependence of the Mass Function of Globular Star Clusters in the Sombrero Galaxy and Its Dynamical Implications
Fall, S. Michael; Chandar, Rupali; McLaughlin, Dean E.
We have constructed the mass function of globular star clusters in the Sombrero galaxy in bins of different internal half-mass density ρh and projected galactocentric distance R. This is based on the published measurements of the magnitudes and effective radii of the clusters by Spitler and coworkers in BVR images taken with the ACS on …
The Complex Structure of the Mg II λλ 2795.523, 2802.698 Å Regions of 64 Be Stars
Lyratzi, Evaggelia; Danezis, Emmanouel; Popovic, Luka C. +3 more
Here we consider the presence of absorption components shifted to the violet or red side of the main spectral line (satellite or discrete absorption components, i.e., SACs or DACs) in the regions of the Mg II resonance lines in Be stars as well as their kinematical characteristics. Namely, our objective is to check whether there exists a common ph…
Spatial structure of plasma flow associated turbulence in the Earth's plasma sheet
Nakamura, R.; Lucek, E. A.; Takada, T. +5 more
Using Cluster multipoint magnetic and plasma measurements we analyze the spatial structure of plasma flow-associated turbulence on 26 September 2005. The fortunate relative configuration of the spacecraft and the plasma flow allowed for the first time to compare the scale evolution of statistical moments both at the boundary and in the central par…
Photometric observations of Rosetta target asteroid 2867 Steins
Lowry, S. C.; Weissman, P. R.; Choi, Y. -J.
Asteroid 2867 Steins is one of two flyby targets of ESA's International Rosetta Mission, launched in March, 2004. We obtained CCD observations of Steins on April 14-16, 2004 at Table Mountain Observatory, California, in order to characterize the asteroid physically, information that is crucial for planning the Steins flyby. This study includes the…
X-Ray Constraints on Galaxy-Gas-Jet Interactions in the Dumbbell Galaxies NGC 4782 and NGC 4783 in the LGG 316 Galaxy Group
Hardcastle, M. J.; Forman, W. R.; Jones, C. +2 more
We present results from a 49.3 ks Chandra X-ray observation of the strongly interacting dumbbell galaxies NGC 4782 (3C 278) and NGC 4783 that constrain the kinematics of the interaction and models for bending the radio jets associated with NGC 4782. The galaxies are embedded in an approximately spherical distribution of group gas, centered on NGC …
Cool-Plasma Jets that Escape into the Outer Corona
Moore, Ronald L.; Sterling, Alphonse C.; Poletto, Giannina +2 more
We report on observations acquired in 2003 May during a SOHO-Ulysses quadrature campaign. The UVCS slit was set normal to the radial of the Sun along the direction to Ulysses at 1.7 Rsolar, at a northern latitude of 14.5°. From May 25 to May 28, UVCS acquired spectra of several short-lived ejections that represent the extension at highe…
Turbulent propagation of high-energy electrons in a solar coronal loop
Melnikov, V. F.; Stepanov, A. V.; Shibasaki, K. +1 more
Aims:We study the solar flare on 28 August 1999 observed by the Nobeyama Radioheliograph at 17 and 34 GHz and analyze the unusual behavior of microwave source (a coronal loop) after injections of high-energy electrons. The observations reveal a propagation velocity of the emission front along the loop of about 104 km s-1, whi…
The magnetic structure of an earthward-moving flux rope observed by Cluster in the near-tail
Lucek, E.; Dunlop, M.; Liu, Z. X. +6 more
We investigate the magnetic structure of a small earthward-moving flux rope observed by Cluster in the near-Earth plasma sheet through application of the Grad-Shafranov (GS) technique to reconstruct the transverse magnetic field distribution perpendicular to the flux rope axis at X=-14.75 RE. We find that the principal axis of the flux …
Young nuclei in dwarf elliptical galaxies
Prugniel, Ph.; Afanasiev, V. L.; Chilingarian, I. V. +1 more
We report the discovery of young embedded structures in three diffuse elliptical galaxies (dE) in the Virgo cluster: IC 783, IC 3468, and IC 3509. We performed 3D spectroscopic observations of these galaxies with the MPFS spectrograph at the 6-m Special Astrophysical Observatory telescope and obtained spatially resolved distributions of kinematic …