Search Publications
The Evolution of Early-Type Field Galaxies Selected from a NICMOS Map of the Hubble Deep Field North
Dickinson, Mark; Ferguson, Henry C.; Lucas, Ray A. +5 more
The redshift distribution of well-defined samples of distant early-type galaxies offers a means to test the predictions of monolithic and hierarchical galaxy formation scenarios. NICMOS maps of the entire Hubble Deep Field North (HDF-N) in the F110W and F160W filters, when combined with the available Wide Field Planetary Camera 2 (WFPC2) data, all…
Cluster survey of the high-altitude cusp properties: a three-year statistical study
Fedorov, A.; Budnik, E.; Grigoriev, A. +6 more
Available from http://www.copernicus.org/site/EGU/annales/22/8/3009.htm?FrameEngine=false;
New values of gravitational moments J2 and J4 deduced from helioseismology
Provost, J.; Berthomieu, G.; Irbah, A. +2 more
By applying the theory of slowly rotating stars to the Sun, the solar quadrupole and octopole moments J2 and J4 were computed using a solar model obtained from CESAM stellar evolution code (Morel, 1997) combined with a recent model of solar differential rotation deduced from helioseismology (Corbard et al., 2002). This model …
Nuclear stellar discs in low-luminosity elliptical galaxies: NGC 4458 and 4478
Halliday, C.; Saglia, R. P.; Morelli, L. +7 more
We present the detection of nuclear stellar discs in the low-luminosity elliptical galaxies, NGC 4458 and 4478, which are known to host a kinematically decoupled core. Using archival Hubble Space Telescope imaging, and available absorption line-strength index data based on ground-based spectroscopy, we investigate the photometric parameters and th…
Absolute Flux Distribution of the SDSS Standard BD +17°4708
Bohlin, R. C.; Gilliland, R. L.
Secondary flux standards are established by measuring their brightness relative to primary standard stars. The Hubble Space Telescope (HST) primary standards are the three pure-hydrogen white dwarf (WD) flux standards that determine the sensitivity calibration for the Space Telescope Imaging Spectrograph. STIS observations have defined the flux of…
Radio Metric Observations of Quiescent Filament Cavities
Marqué, C.
We present in this paper a systematic study of the filament environment in the metric radio range, describing the existence of brightness temperature depressions above quiescent filaments on the disk and on the limb. Using the upgraded Nançay Radioheliograph, Hα data from Meudon Observatory, and EIT and LASCO data from SOHO, we estimate the bright…
Dynamics and Structure of Supergranulation
Kosovichev, A. G.; Duvall, T. L., Jr.; Berrilli, F. +1 more
In this paper we investigate the temporal evolution and geometric properties of solar supergranular features. For this purpose we apply an automatic feature-tracking algorithm to a 6-day time series of 18 near-surface flowmaps containing 548 target objects. Lifetimes are calculated by measuring the time elapsing between the birth and death of each…
Energy Crisis in the Superbubble DEM L192 (N51D)
Guerrero, Martín A.; Chu, You-Hua; Chen, C. -H. Rosie +2 more
Superbubbles surrounding OB associations provide ideal laboratories in which to study the stellar energy feedback problem, because the stellar energy input can be estimated from the observed stellar content of the OB associations, and the interstellar thermal and kinetic energies of superbubbles are well defined and easy to observe. We have used D…
Menzel 3: Dissecting the ant
Balick, B.; Corradi, R. L. M.; Santander-García, M. +1 more
The structure and kinematics of the bipolar nebula Mz 3 have been investigated by means of HST, CTIO and ESO images and spectra. At least four distinct outflows have been identified which, from the inside to the outside, are the following: a pair of bright bipolar lobes, two opposite highly collimated column-shaped outflows, a conical system of ra…
First comparisons of local ion measurements in the inner magnetosphere with energetic neutral atom magnetospheric image inversions: Cluster-CIS and IMAGE-HENA observations
Dunlop, Malcolm; Balogh, André; Dandouras, Iannis +9 more
Data provided by the CIS (Cluster Ion Spectrometry) instruments on board the Cluster spacecraft are used to survey recent crossings of the inner magnetosphere and ring current. CIS is capable of obtaining full three-dimensional ion distributions (about 0 to 40 keV/q) with one spacecraft spin time resolution and with mass-per-charge composition det…