Search Publications
Missions
Journals
Publication Years
FUSE observations of the H I interstellar gas of I Zw 18
Kunth, D.; Lebouteiller, V.; Lecavelier des Etangs, A. +5 more
We present the analysis of FUSE observations of the metal-deficient dwarf galaxy I Zw 18 . We measured column densities of H I, N I, O I, Ar I, Si II, and Fe II. The O I/H I ratio (\log(O I/H I)=-4.7+0.8-0.6) is consistent with the O/H ratio observed in the H II regions (all uncertainties are 2-σ). If the oxygen is depleted i…
Hydromagnetic Wave Excitation Upstream of an Interplanetary Traveling Shock
Klecker, B.; Wimmer-Schweingruber, R. F.; Hilchenbach, M. +5 more
Using data of the Highly Suprathermal Time-Of-Flight sensor of the Charge, Element, and Isotope Analysis System on board the Solar and Heliospheric Observatory spacecraft located at Lagrangian point L1 near Earth, we have measured proton spectra in the energy range 60 keV-2 MeV associated with the Bastille Day coronal mass ejection of 2000 July 14…
A dipping black hole X-ray binary candidate in NGC 55
Warwick, R. S.; Roberts, T. P.; Stobbart, A. -M.
XMM-Newton European Photon Imaging Camera (EPIC) observations have revealed a bright point-like X-ray source in the nearby Magellanic-type galaxy NGC 55. At the distance of NGC 55, the maximum observed X-ray luminosity of the source, designated as XMMU J001528.9 - 391319, is Lx ~ 1.6 × 1039 erg s-1, placing the obj…
A three-dimensional model of moist convection for the giant planets II: Saturn's water and ammonia moist convective storms
Hueso, Ricardo; Sánchez-Lavega, Agustín
Moist convective storms constitute a key aspect in the global energy budget of the atmospheres of the giant planets. Among them, Saturn is known to develop the largest scale convective storms in the Solar System, the Great White Spots (GWS) which occur rarely and have been detected once every 30 years approximately. On the average, Saturn seems to…
The Mass of the MACHO-LMC-5 Lens Star
Gould, Andrew; Bennett, David P.; Alves, David R.
We combine the available astrometric and photometric data for the 1993 microlensing event MACHO-LMC-5 to measure the mass of the lens, M=0.097+/-0.016Msolar. This is the most precise direct mass measurement of a single star other than the Sun. In principle, the measurement error could be reduced as low as 10% by improving the trigonomet…
Internal Color Properties of Resolved Spheroids in the Deep Hubble Space Telescope Advanced Camera for Surveys Field of UGC 10214
Ford, H. C.; Infante, L.; Zheng, W. +31 more
We study the internal color properties of a morphologically selected sample of spheroidal galaxies taken from the Hubble Space Telescope (HST) Advanced Camera for Surveys (ACS) Early Release Observation program of UGC 10214 (``the Tadpole''). By taking advantage of the unprecedented high resolution of the ACS in this very deep data set, we are abl…
A tale of two very different comets: ISO and MSX measurements of dust emission from 126P/IRAS (1996) and 2P/Encke (1997)
A'Hearn, M. F.; Kostiuk, T.; Grün, E. +7 more
We present the characteristics of the dust comae of two comets, 126P/IRAS, a member of the Halley family (a near-isotropic comet), and 2P/Encke, an ecliptic comet. We have primarily used mid- and far-infrared data obtained by the ISOPHOT instrument aboard the Infrared Space Observatory (ISO) in 1996 and 1997, and mid-infrared data obtained by the …
AFS dynamic evolution during the emergence of an active region
Romano, P.; Spadaro, D.; Contarino, L. +2 more
Using data acquired during an observational campaign carried out at the THEMIS telescope in IPM mode, coordinated with other ground- and space-based instruments (IOACT, TRACE, EIT/SOHO, MDI/SOHO), we have analyzed the first evolutionary phases of a recurrent active region (NOAA 10050), in order to study the morphology and dynamics of its magnetic …
X-ray flares from the ultra-luminous X-ray source in NGC 5408
Read, A. M.; Motch, C.; Soria, R. +1 more
We have studied an ultra-luminous X-ray source (ULX) in the dwarf galaxy NGC 5408 with a series of XMM-Newton observations, between 2001 July and 2003 January. We find that its X-ray spectrum is best fitted with a power law of photon index Γ ≈ 2.6-2.9 and a thermal component with blackbody temperature kTbb ≈ 0.12-0.14 keV. These spectra…
XMM-Newton and Chandra observations of three X-ray-faint early-type galaxies
O'Sullivan, E.; Ponman, T. J.
We present XMM-Newton observations of three X-ray-underluminous elliptical galaxies, NGC 3585, 4494 and 5322. All three galaxies have relatively large optical luminosities (logLB= 10.35-10.67 Lsolar) but have X-ray luminosities consistent with emission from discrete sources only. In conjunction with a Chandra observation of N…