Search Publications
Detectability of micro-variables in the ASAS database
David, M.; Nitschelm, C.; Hensberge, H.
Aims: We exploit nine years of photometry in the ASAS V-band catalogue to develop a method to select in an objective way the best quality data and detect low-amplitude variables. We concentrate on bright stars (V < 10) and avoid open cluster stellar densities.
Methods: We use the (probable) members of the Sco-Cen associations as a tes…
A Gravitational Lens Model for the Lyα Emitter LAE 221724+001716 at z = 3.1 in the SSA 22 Field
Taniguchi, Y.; Kajisawa, M.; Matsuda, Y. +8 more
During the course of our Lyman continuum imaging survey, we found that the spectroscopically confirmed Lyα emitter LAE 221724+001716 at z = 3.10 in the SSA 22 field shows strong Lyman continuum emission (λrest ~ 900 Å) that escapes from this galaxy. However, another recent spectroscopic survey revealed that the supposed Lyman continuum …
“Superluminal” FITS File Processing on Multiprocessors: Zero Time Endian Conversion Technique
Eguchi, Satoshi
The FITS is the standard file format in astronomy, and it has been extended to meet the astronomical needs of the day. However, astronomical datasets have been inflating year by year. In the case of the ALMA telescope, a ∼TB-scale four-dimensional data cube may be produced for one target. Considering that typical Internet bandwidth is tens of MB/s…
The Planck Mission: Recent Results, Cosmological and Fundamental Physics Perspectives
Burigana, Carlo; Gruppuso, Alessandro; Natoli, Paolo +1 more
We provide a description of the latest status and performance of the Planck satellite, focusing on the final predicted sensitivity of Planck. The optimization of the observational strategy for the additional surveys following the nominal 15 months of integration (about two surveys) originally allocated and the limitation represented by astrophysic…
Bidirectional Fluxes of Nearly Relativistic Electrons During the Onset of Solar Energetic Particle Events
Li, C.; Sun, L. P.
We report intensity and anisotropy measurements of energetic electrons in the energy range of ~27-~500 keV as observed with the Wind and Advanced Composition Explorer (ACE) spacecraft in 2000 June for several solar energetic particle (SEP) events. The solar sources of the SEP events are inferred from observations from the Solar and Heliospheric Ob…
IMF-induced escape of molecular ions from the Martian ionosphere
Fujimoto, M.; Kubota, Y.; Maezawa, K. +1 more
Since Mars does not possess a significant global intrinsic magnetic field, the solar wind interacts directly with the Martian ionosphere and can induce ion escapes from it. Phobos-2 and recent Mars Express (MEX) observations have shown that the escaping ions are O+ as well as molecular O2+ and CO2+<…
I-band Measurements of Red Giant Variables: Methods and Photometry of 66 Stars
Moon, T. T.
New measurements of IC and V-IC are presented for 66 bright red giant variables. This is the first stage of a program to measure sufficient numbers of such stars that also have well-determined Hipparcos parallaxes with a view to calibrating the TRGB in the IC band as a tool for accurately measuring distances to nearby galaxies.
New face in the spectral behavior of Capella in the UV
Sanad, M. R.
We present low and high resolution ultraviolet spectra of the Capella spectroscopic binary system from the observations taken by the International Ultraviolet Explorer (IUE) during the period between 1978–1990 and 1978–1995. Thirteen profile of Capella showing variations of line fluxes at different orbital phases are presented. This paper focuses …
Distant clusters of galaxies in a deep XMM-Newton observation
Böhringer, H.; Rosati, P.; Schwope, A. +10 more
The XMM-Newton Distant Cluster Project (XDCP) aims at the identification of a well defined sample of X-ray selected clusters of galaxies at redshifts z ≥ 0.8. As part of this project, we analyse the deep archival XMM-Newton exposure of LBQS 2212-1759 to quantify the cluster content. We validate the optical follow-up strategy as well as the X-ray s…
Comparison of the four catalogues by pairs, the Hipparcos, new Hipparcos, EOC-2 and IL, by using µδ for the common 1120 stars}
Cvetković, Z.; Damljanović, G.; Cvetković , Z.
We present comparison results of our Independent Latitude (IL) catalogue of µδ determinations for 1120 bright stars with the Hipparcos, new Hipparcos and Earth Orientation Catalogue (EOC-2) values. Also, we took into consideration the EOC3 and EOC4 (recent versions of EOC catalogues). Our µδ values are based on ze…