Search Publications
INTEGRAL survey of the Cassiopeia region in hard X rays
Vink, J.; Kuiper, L.; Hermsen, W. +3 more
We report on the results of a deep 1.6 Ms INTEGRAL observation of the Cassiopeia region performed from December 2003 to February 2004. Eleven sources were detected with the imager IBIS-ISGRI at energies above 20 keV, including three new hard X-ray sources. Most remarkable is the discovery of hard X-ray emission from the anomalous X-ray pulsar 4U 0…
Frequency of Hot Jupiters and Very Hot Jupiters from the OGLE-III Transit Surveys toward the Galactic Bulge and Carina
Udalski, A.; Gould, A.; Gaudi, B. S. +1 more
We derive the frequencies of hot Jupiters (HJs) with 3-5 day periods and very hot Jupiters (VHJs) with 1-3 day periods by comparing the planets actually detected in the OGLE-III survey with those predicted by our models. The models are constructed following Gould and Morgan (2003) by populating the line of sight with stars drawn from the Hipparcos…
INTEGRAL and XMM-Newton observations of LSI +61° 303
Walter, R.; Chernyakova, M.; Neronov, A.
LSI +61° 303 is one of the few X-ray binaries with Be star companion from which both radio and high-energy γ-ray emission have been observed. We present XMM-Newton and INTEGRAL observations which reveal variability of the X-ray spectral index of the system. The X-ray spectrum is hard (photon index Γ ~= 1.5) during the orbital phases of both high a…
Statistics of relativistically broadened Fe Kα lines in AGN
Bianchi, S.; Guainazzi, M.; Dovčiak, M.
We present preliminary results on the properties of relativistically broadened Fe Kα lines in a collection of more then 100 Active Galactic Nuclei (AGN) observed by the XMM-Newton EPIC-pn camera. Our main conclusions can be summarized as follows: a) we detect broad lines in about 25% of the sample objects. This fraction increases to 42 ± 13 % if w…
Debris-covered piedmont glaciers along the northwest flank of the Olympus Mons scarp: Evidence for low-latitude ice accumulation during the Late Amazonian of Mars
Head, James W.; Marchant, David R.; Milkovich, Sarah M.
We use Viking and new MGS and Odyssey data to characterize the lobate deposits superimposed on aureole deposits along the west and northwest flanks of Olympus Mons, Mars. These features have previously been interpreted variously as landslide, pyroclastic, lava flow or glacial features on the basis of Viking images. The advent of multiple high-reso…
Properties of the energetic particle distributions during the October 28, 2003 solar flare from INTEGRAL/SPI observations
Kiener, J.; Tatischeff, V.; Weidenspointner, G. +1 more
Analysis of spectra obtained with the gamma-ray spectrometer SPI onboard INTEGRAL of the GOES X17-class flare on October 28, 2003 is presented. In the energy range 600 keV-8 MeV three prominent narrow lines at 2.223, 4.4 and 6.1 MeV, resulting from nuclear interactions of accelerated ions within the solar atmosphere could be observed. Time profile…
Absolute magnitudes of OB and Be stars based on Hipparcos parallaxes - II
Wegner, W.
A new method of determining absolute visual magnitudes of early-type stars, based on averaging Hipparcos parallaxes (ESA 1997) inside samples of the same spectrum and luminosity (Sp/L) classes, is proposed. The used sample consists of 6262 unreddened and reddened OB stars as well as 430 Be stars of luminosity classes Ia, Iab, Ib, II, III, IV and V…
Cassini/VIMS hyperspectral observations of the HUYGENS landing site on Titan
Le Mouélic, S.; Rodriguez, S.; Sotin, C. +8 more
Titan is one of the primary scientific objectives of the NASA-ESA-ASI Cassini-Huygens mission. Scattering by haze particles in Titan's atmosphere and numerous methane absorptions dramatically veil Titan's surface in the visible range, though it can be studied more easily in some narrow infrared windows. The Visual and Infrared Mapping Spectrometer…
Plateau de Bure interferometer observations of the disk and outflow of HH 30
Pety, J.; Gueth, F.; Guilloteau, S. +1 more
Context: .HH 30 is a well-known Pre-Main-Sequence star in Taurus. HST observations have revealed a flared, edge-on disk driving a highly-collimated optical jet, making this object a case study for the disk-jet-outflow paradigm.
Aims: .We searched for a molecular outflow, and attempted to better constrain the star and disk parameters.
Metho…
Detection of Six Trans-Neptunian Binaries with NICMOS: A High Fraction of Binaries in the Cold Classical Disk
Noll, Keith S.; Stephens, Denise C.
We have analyzed a homogeneous set of observations of 81 trans-Neptunian objects obtained with NIC2 on the Hubble Space Telescope with the goal of identifying partially resolved binaries. Using PSF fitting we have identified six likely binaries in addition to the three new binaries already found in this data set. We find that 11+5-…