Search Publications
Rest-frame UV to optical X-shooter spectrum of the gravitationally lensed galaxy ``the 8 o'clock arc'': Dissection of its physical properties
Schaerer, D.; Dessauges-Zavadsky, M.; Richard, J. +2 more
We present the rest-frame UV to optical spectrum of the gravitationally lensed galaxy, the ``8 o'clock arc'' at z=2.735, obtained with the X-shooter spectrograph. This is one of the rare comprehensive study of a high-redshift star-forming galaxy, usually not feasible due to the faintness of these objects. The spectrum of the 8 o'clock arc is rich …
Gravitationally lensed QSOs in the ISSIS/WSO-UV era
Gil-Merino, R.; Goicoechea, L. J.; Shalyapin, V. N.
Gravitationally lensed QSOs (GLQs) at 1≤z≤2 play a key role in understanding the cosmic evolution of the innermost parts of active galaxies (black holes, accretion disks, coronas and internal jets), as well as the structure of galaxies at intermediate redshifts. With respect to studies of normal QSOs, GLQ programmes have several advantages. For ex…
Updated Phoebe's orbit
Zhang, H. Y.; Qiao, R. C.; Shen, K. X. +4 more
In recent years, many new CCD observations of Phoebe, the ninth Saturnian satellite, were published. In this paper, we have used all the observations of Phoebe available until 2009 to update Phoebe's orbit. These observations represent a total number of 2994 positions, spread over a time-interval of 105 years, from 1904 to 2009. The accuracy of th…
Saturnian Low-Frequency Drifting Radio Bursts: Statistical Properties and Polarization
Gurnett, D. A.; Fischer, G.; Leisner, J. S. +2 more
After Cassini's arrival at planet Saturn, its Radio and Plasma Wave Science (RPWS) experiment has performed numerous observations of a new type of planetary radio emissions in the lower kHz frequency range (< 50 kHz). These bursty emissions have time scales of a few to 15 minutes and occur as slowly drifting events in the time-frequency spectro…
Structure and kinetic properties of slow-mode shocks associated with magnetic reconnection in the near-Earth magnetotail
Yuan, Zhigang; Zhou, Meng; Lin, Xi +3 more
We study the structure and kinetic properties of slow-mode shocks near the plasma sheet boundary layer (PSBL) associated with magnetic reconnection by Cluster observation. The presence of slow-mode shocks is confirmed by traditional Rankine-Hugoniot (RH) analysis and Monte-Carlo shock fitting method. The Walén analysis, applied to the tailward flo…
Photometric and spectroscopic observations of asteroid (21) Lutetia three months before the Rosetta fly-by
Lara, L. M.; Lin, Z. -Y.; Duffard, R. +1 more
Context. On its journey to comet 67P/Churyumov-Gerasimenko, the International Rosetta Mission (ESA) was planned to fly-by two asteroids: (2867) Steins and (21) Lutetia. Although classified as an M-type asteroid because of its high albedo, its reflectance spectrum in the near and mid-infrared region, suggests a primitive composition, more typical o…
Kyiv meridian axial circle with a new CCD camera
Andruk, V. N.; Lazorenko, P. F.; Karbovs'ky, V. L. +4 more
Specifications of a new Apogee Alta U47 CCD camera mounted at the Kyiv meridian axial circle (MAC) are presented. The camera is based on the 1024 × 1024 pxl e2v CCD47-10 with pixel sizes of 13 × 13 µm. Observations are carried out in the scan-drift mode with an effective exposure time of 77 s for equatorial stars. The MAC photometric system …
The plasma emission model of RBS1774
Chkheidze, N.
In the present paper we construct a self-consistent theory, interpreting the observational properties of RBS1774. It is well known that the distribution function of relativistic particles is one-dimensional at the pulsar surface. However, cyclotron instability causes an appearance of transverse momenta of relativistic electrons, which as a result,…
The acoustic cutoff frequency of the Sun and the solar cycle
García, R. A.; Pallé, P. L.; Jiménez, A.
The acoustic cutoff frequency - highest frequency for acoustic solar eigenmodes-is an important parameter of the solar atmosphere because it determines the upper boundary of the p mode cavities. At frequencies beyond this value, acoustic disturbances are no longer trapped waves but traveling waves. Interferences amongst them, originate higher freq…
Multi-wavelength Observations of a Sample of Intermediate-luminosity Radio-loud Active Galaxies
Eracleous, Michael; Lewis, Karen T.; Sambruna, Rita M. +3 more
We present the results from exploratory (12-23 ks) XMM-Newton observations of six optically selected, radio-loud active galactic nuclei (AGNs), together with new radio data and a reanalysis of their archival SDSS spectra. The sources were selected in an effort to expand the current sample of radio-loud AGNs suitable for detailed X-ray spectroscopy…