Search Publications
Cassini dust stream particle measurements during the first three orbits at Saturn
Kempf, S.; Postberg, F.; Srama, R. +5 more
Stream particles are nanometer-scale dust particles ejected with speeds $\gtrsim$100 km s-1 from both the Jovian and Saturnian systems. Here we report the dynamical analysis of Saturnian stream particles on the basis of observations made by the Cosmic Dust Analyzer on board the Cassini spacecraft during its first three orbits around Sat…
A Method for the Study of Accretion Disk Emission in Cataclysmic Variables. I. The Model
Hillier, D. John; Hubeny, Ivan; Puebla, Raúl E. +1 more
We have developed a spectrum synthesis method for modeling the ultraviolet (UV) emission from the accretion disk from cataclysmic variables (CVs). The disk is separated into concentric rings, with an internal structure from the Wade & Hubeny disk-atmosphere models. For each ring, a wind atmosphere is calculated in the comoving frame with a ver…
MAD about the Large Magellanic Cloud. Preparing for the era of Extremely Large Telescopes
Cignoni, M.; Valenti, E.; Fiorentino, G. +3 more
We present J,H,Ks photometry from the the Multi conjugate Adaptive optics Demonstrator (MAD), a visitor instrument at the VLT, of a resolved stellar population in a small crowded field in the bar of the Large Magellanic Cloud near the globular cluster NGC 1928. In a total exposure time of 6, 36 and 20 min, magnitude limits were achieved…
AX J1910.7+0917 and three newly discovered INTEGRAL sources
Stella, L.; Walter, R.; Ferrigno, C. +4 more
Aims: We take advantage of the high sensitivity of the IBIS/ISGRI telescope and the improvements in the data analysis software to investigate the nature of the still poorly known X-ray source AX J1910.7+0917, and search for closeby previously undetected objects.
Methods: We analyze all publicly available INTEGRAL data of AX J1910.7+0917,…
Long-term hard X-ray monitoring of 2S 0114+65 with INTEGRAL/IBIS
Wang, Wei
We present the results of the long-term hard X-ray monitoring of the high-mass X-ray binary 2S 0114+65 with INTEGRAL/IBIS from 2003 to 2008. 2S 0114+65 is a variable hard X-ray source with X-ray luminosities of 1035-4 × 1036 erg s-1 from 20 to 100 keV due to accretion rate changes in different orbital phases. In se…
The last dance of the bashful ballerina?
Mursula, K.; Virtanen, I.
Aims: The heliospheric magnetic field (HMF) has long been hemispherically asymmetric so that the field in the northern hemisphere is weaker and the area larger than in the south. This asymmetry, also called the bashful ballerina, has existed during roughly three-year intervals of the late declining to minimum phase of solar cycles 16-22. We s…
Optical maturity variation in lunar spectra as measured by Moon Mineralogy Mapper data
Clark, R. N.; Besse, S.; Nettles, J. W. +8 more
High spectral and spatial resolution data from the Moon Mineralogy Mapper (M3) instrument on Chandrayaan-1 are used to investigate in detail changes in the optical properties of lunar materials accompanying space weathering. Three spectral parameters were developed and used to quantify spectral effects commonly thought to be associated …
Herschel-Astrophysical Terahertz Large Area Survey: detection of a far-infrared population around galaxy clusters
Rodighiero, G.; Ivison, R. J.; Clements, D. L. +30 more
We report the detection of a significant excess in the surface density of far-infrared sources from the Herschel-Astrophysical Terahertz Large Area Survey within ∼1 Mpc of the centres of 66 optically selected clusters of galaxies in the Sloan Digital Sky Survey with <z>∼ 0.25. From the analysis of the multiwavelength properties of their coun…
Constraining the molecular gas in the environs of a z∼ 8 gamma-ray burst host galaxy
Stanway, Elizabeth R.; Bremer, Malcolm N.; Davies, Luke J. M. +2 more
GRB 090423 is the most distant spectroscopically confirmed source observed in the Universe. Using observations at 37.5 GHz, we place constraints on molecular gas emission in the CO (3-2) line from its host galaxy and immediate environs. The source was not detected either in line emission or in the rest-frame 850-µm continuum, yielding an upp…
A comprehensive study of six Algol type binaries
Liakos, A.; Zasche, P.; Niarchos, P.
CCD light curves of the Algol type eclipsing binaries DP Cep, AL Gem, FG Gem, UU Leo, CF Tau and AW Vul were analysed using the Wilson-Devinney code and new geometric and absolute parameters were derived. Due to cyclic apparent orbital period changes of the systems, probably caused by the Light-Time Effect, the contribution of a third light was ta…