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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…
Far-Ultraviolet and X-Ray Observations of the Reverse Shock in the Small Magellanic Cloud Supernova Remnant 1E 0102.2-7219
Blair, William P.; Sasaki, Manami; Smith, Randall K. +4 more
We present Far Ultraviolet Spectroscopic Explorer (FUSE) and X-Ray Multi-Mirror Mission (XMM-Newton) data for the reverse shock of the O-rich supernova remnant (SNR) 1E 0102.2-7219 in the Small Magellanic Cloud (SMC). The FUSE observations cover three regions with significantly different optical [O III] intensities, all associated with the relativ…
The optical to γ-ray emission of the Crab pulsar: a multicomponent model
Cusumano, G.; Campana, R.; Mineo, T. +1 more
We present a multicomponent model to explain the features of the pulsed emission and spectrum of the Crab Pulsar, on the basis of X and γ-ray observations obtained with BeppoSAX, INTEGRAL and CGRO. This model explains the evolution of the pulse shape and of the phase-resolved spectra, ranging from the optical/UV to the GeV energy band, on the assu…
The association between gas and galaxies - I. CFHT spectroscopy and pair analysis
Morris, Simon L.; Jannuzi, Buell T.
We investigate the relative distribution of the gaseous contents of the Universe (as traced by a sample of Lyα absorbers), and the luminous baryonic matter (as traced by a redshift survey of galaxies in the same volume searched for Lyα absorbers), along 16 lines of sight (LOS) between redshifts 0 and 1. Our galaxy redshift survey was made with the…