Search Publications
Five years of Ulysses dust data: 2000 2004
Dikarev, V.; Krüger, H.; Srama, R. +20 more
The Ulysses spacecraft has been orbiting the Sun on a highly inclined ellipse ( i=79∘, perihelion distance 1.3 AU, aphelion distance 5.4 AU) since it encountered Jupiter in 1992. Between January 2000 and December 2004, the spacecraft completed almost an entire revolution about the Sun, passing through perihelion in May 2001 and aphelion…
Supermassive black hole mass functions at intermediate redshifts from spheroid and AGN luminosity functions
Ueda, Yoshihiro; Tamura, Naoyuki; Ohta, Kouji
Redshift evolution of supermassive black hole mass functions (BHMFs) is investigated up to z~ 1. BHMFs at intermediate redshifts are calculated in two ways. One way is from early-type galaxy luminosity functions (LFs); we assume an MBH-Lsph correlation at a redshift by considering a passive evolution of Lsph in the…
X-ray emission from T Tauri stars in the Lupus 3 star-forming region
Gondoin, P.
Aims.In this paper, I present analysis results of an {XMM-Newton} observation of the Lupus 3 region that contains a high proportion of young low mass (M < 0.3 M⊙) T Tauri stars in the Lupus star-forming complex.
Methods: .The detection of X-ray sources in 0.5 to 4.5 keV images of the Lupus 3 core was performed using the standard …
Jupiter's White Oval turns red
Simon-Miller, Amy A.; Karkoschka, Erich; Chanover, Nancy J. +3 more
Jupiter's remaining White Oval changed color in late 2005 and became noticeably red in early 2006, as reported by amateur observers. We present wind and color analyses from high spatial resolution images taken with the Hubble Space Telescope Advanced Camera for Surveys in April 2006. These images suggest that the recent color change was tied to a …
Variability and multiperiodic oscillations in the X-ray light curve of the classical nova V4743 Sgr
Ness, J. -U.; Orio, M.; Gonzalez-Riestra, R. +5 more
The classical nova V4743 Sgr was observed with XMM-Newton for about 10h on 2003 April 4, 6.5 months after optical maximum. At this time, this nova had become the brightest supersoft X-ray source ever observed. In this paper, we present the results of a time-series analysis performed on the X-ray light curve (LC) obtained in this observation, and i…
The Binary Nucleus in VCC 128: A Candidate Supermassive Black Hole in a Dwarf Elliptical Galaxy
Pasquali, Anna; Seth, Anil; Debattista, Victor P. +3 more
Hubble Space Telescope (HST) Wide Field Planetary Camera 2 (WFPC2) images of the Virgo Cluster dwarf elliptical galaxy VCC 128 reveal an apparently double nucleus. The two components, which are separated by ~32 pc in projection, have the same magnitude and color. We present a spectrum of this double nucleus and show that it is inconsistent with on…
A new symbiotic low mass X-ray binary system: 4U 1954+319
Caraveo, P. A.; de Luca, A.; Götz, D. +4 more
Aims.4U 1954+319 was discovered 25 years ago, but only recently has a clear picture of its nature begun to emerge. We present for the first time a broad-band spectrum of the source and a detailed timing study using more than one year of monitoring data.
Methods: .The timing and spectral analysis was done using publicly available Swift, INTEGRA…
Divergent electric fields in downward current channels
Streltsov, A. V.; Marklund, G. T.
The results from a numerical study on the formation and dynamics of the localized, diverging perpendicular electric fields found in the nightside auroral magnetosphere are presented. These fields are frequently observed inside the downward magnetic field-aligned current (FAC) channels where the electrons flow upward from the ionosphere. The presen…
Low Radiative Efficiency Accretion at Work in Active Galactic Nuclei: The Nuclear Spectral Energy Distribution of NGC 4565
Macchetto, F. D.; Gilli, R.; Sparks, William B. +1 more
We derive the spectral energy distribution (SED) of the nucleus of the Seyfert galaxy NGC 4565. Despite its classification as a Seyfert 2, the nuclear source is substantially unabsorbed. The absorption we find from Chandra data (NH=2.5×1021 cm-2) is consistent with that produced by material in the galactic disk of …
High-Energy Particles in the Wind Nebula of Pulsar B1509-58 as Seen by INTEGRAL
Goret, P.; Laurent, P.; Kuiper, L. +5 more
We present observations with the INTEGRAL IBIS telescope of the wind nebula powered by the young pulsar B1509-58, and we discuss the spatial and spectral properties of the unpulsed emission in the 20-200 keV energy band. The source extension and orientation along the northwest-southeast axis correspond to the jet emission seen at keV and TeV energ…