Search Publications
Cluster and cluster galaxy evolution history from IR to X-ray observations of the young cluster RX J1257.2+4738 at z = 0.866
Ilbert, O.; Adami, C.; Gavazzi, R. +8 more
Context: The cosmic time around the z ~ 1 redshift range appears crucial in the cluster and galaxy evolution, since it is probably the epoch of the first mature galaxy clusters. Our knowledge of the properties of the galaxy populations in these clusters is limited because only a handful of z ~ 1 clusters are presently known.
Aims: In this fram…
Lacerta OB1 Revisited
Kaltcheva, Nadia
This investigation utilizes precise uvbyβ photometry and the recently recalculated Hipparcos data to provide an improved homogeneous distance scale for the apparent groups of young stars in Lacerta. All existing uvbyβ photometry for stars earlier than A0-type in a 20° × 20° field centered at l = 100°, b = -15° is collated and the individual stella…
Near-Simultaneous Observations of X-Ray Plasma Ejection, Coronal Mass Ejection, and Type II Radio Burst
Cho, K. -S.; Moon, Y. -J.; Kim, Yeon-Han +2 more
We report the first simultaneous observation of X-ray plasma ejection (XPE), coronal mass ejection (CME), and type II solar radio burst on 1999 October 26. First, an XPE was observed from 21:12 UT to 21:24 UT in the Yohkoh SXT field of view (1.1 to 1.4 R sun). The XPE was accelerated with a speed range from 190 to 410 km s-1 …
Kinematics of the broad absorption line region in QSOs: Rotation and random motion
Popović, L. Č.; Antoniou, A.; Danezis, E. +2 more
Assuming that the Broad Absorption Line Region - BALR (originated in a disk wind) is composed of a number of successive independent absorbing density layers, which have apparent rotational and radial velocities and where ions have random velocities, we applied a model in order to obtain the kinematical parameters of BALR, by fitting the broad abso…
Evolution of the cloud field and wind structure of Jupiter's highest speed jet during a huge disturbance
Sánchez-Lavega, A.; García-Melendo, E.; Pérez-Hoyos, S. +1 more
Aims: Despite the banded visual aspect of cloud patterns in Jupiter, high resolution images indicate that these regions are markedly turbulent. One region of particular interest is the north temperate belt (NTB) at 21° N planetocentric latitude, where the most intense Jovian jet resides with eastward peak speeds of 160-180 m s-1. Almost…
No first ionization potential fractionation in the active stars AR Piscium and AY Ceti
Sanz-Forcada, J.; Micela, G.; Affer, L.
Context: The comparison of coronal and photospheric abundances in cool stars is an essential question to resolve. In the Sun an enhancement of the elements with low first ionization potential (FIP) is observed in the corona with respect to the photosphere. Stars with high levels of activity seem to show a depletion of elements with low FIP when co…
A second black hole candidate in a M31 globular cluster is identified with XMM-Newton
Kolb, U.; Barnard, R.
We use arguments developed in previous work to identify a second black hole candidate associated with an M31 globular cluster (GC), Bo 144, on the basis of X-ray spectral and timing properties. The 2002 XMM-Newton observation of the associated X-ray source (hereafter XBo 144) revealed behaviour that is common to all low-mass X-ray binaries (LMXBs)…
Globular cluster candidates in NGC 891
Rejkuba, M.; Mouhcine, M.; Ibata, R. +1 more
We use deep images taken with the Advanced Camera for Surveys (ACS) on board the Hubble Space Telescope of the disc galaxy NGC 891 to search for globular cluster (GC) candidates. This galaxy has long been considered to be a close analogue in size and structure to the Milky Way and is nearly edge-on, facilitating studies of its halo population. The…
Impact of the plasma fluctuations in the Martian ionosphere on the performance of the synthetic aperture ground-penetrating radar
Ilyushin, Ya. A.
The effect of the ionospheric scintillations on the performance of the dekameter wave band synthetic aperture radar (SAR) is considered. The numerical model for computer simulations, based on the multiple phase screen technique and accounting for diffraction, is formulated. The result of numerical simulations of the radar pulses is presented and a…
Two types of dynamic cool coronal structures observed with STEREO and Hinode
Zhang, Jun; Li, Le-Ping
Solar coronal loops show significant plasma motions during their formation and eruption stages. Dynamic cool coronal structures, on the other hand, are often observed to propagate along coronal loops. We report on the discovery of two types of dynamic cool coronal structures, and characterize their fundamental properties. Using the EUV 304 Å image…