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A Multiwavelength Study of the Jets in FR-I Radio Galaxies: I. Data and Analysis
Zhou, Hong-Yan; Meng, Da-Min
We compile a sample of 11 Fanaroff-Riley type I Radio Galaxies (FR-I RGs) with multi-wavelength observations to address the dynamic behavior of jets in these objects. Optical images acquired by the Hubble Space Telescope (HST) are carefully analyzed. The method and reduction procedure are described in detail. Unresolved optical cores emerge after …
Cassini/Huygens at Saturn and Titan
Mitchell, Robert T.
The Cassini/Huygens Project is a joint undertaking between NASA, the European Space Agency, and the Italian Space Agency to conduct an in-depth exploration of the Saturnian system. The spacecraft consists of an orbiter vehicle and an atmospheric probe which has completed its mission in the atmosphere and on the surface of Titan, the largest moon o…
The origin of the strong soft excess and puzzling iron line complex in Mkn 841
Maraschi, L.; Nandra, K.; Ponti, G. +8 more
Mkn 841 has been observed during 3 different periods (January 2001, January 2005 and July 2005) by XMM-Newton for a total cumulated exposure time of ∼108 ks. We present in this paper a broad band spectral analysis of the complete EPIC-pn data sets. These observations confirm the presence of the strong soft excess and complex iron line profile know…
NGC 7679: an anomalous, composite Seyfert 1 galaxy whose X-ray luminous AGN vanishes at optical wavelengths
Held, E. V.; Lim, J.; Buson, L. M. +3 more
Morphological disturbances and gas kinematics of the SB0 galaxy NGC 7679 = Arp 216 are investigated to understand the history of this highly composite object, where AGN and starburst signatures dominate in the X-ray and optical/IR regime, respectively. Perturbations of the ionized gas velocity field appear quite mild within 15'' (~5 kpc) of the ce…
Narrow-Line Seyfert 1 Galaxies with high-energy sharp spectral drops: reflection-versus absorption models
Boller, Th.
With the launch of XMM-Newton in 1999, two Narrow-Line Seyfert 1 Galaxies (NLS1s) have been detected (IRAS 13224-3809 and 1H 0707-495) showing sharp spectral drops at energies equal or above the neutral Fe K edge at 7.1 keV without any narrow Fe K reemission. In this paper I summarize our present knowledge on the observed properties of sharp high-…
X-ray observations of black-hole accretion disks
Ebisawa, Ken; Kawaguchi, Toshihiro
Our current theoretical and observational understandings of the accretion disks around Galactic black-holes are reviewed. Historically, a simple phenomenological accretion disk model has been used to interpret X-ray observations. Although such a phenomenological interpretation is still useful, high quality X-ray data from contemporary instruments …
Radial and Latitudinal Variations of the Energetic Particle Response to ICMEs
Lario, D.
We present energetic particle observations during events in which the interplanetary counterpart of a single coronal mass ejection (ICME) has been observed by spacecraft widely separated in radial distance and latitude. The effects that ICMEs have on energetic particle intensities depend on (1) the ability of ICMEs to drive strong shocks able to a…
Renewed acceleration of the 24° N jet on Jupiter
Rogers, John H.; Mettig, Hans-Jörg; Peach, Damian
Jupiter's eastward jet at 24° N, which formerly had the fastest winds on the planet, has maintained a less extreme speed of ∼135 m/s since 1991, carrying a series of long-lived vortices at 125 m/s. In 2002-2003, as the albedo of the adjacent North Temperate Belt increased, the tracks of the vortices accelerated slightly, and they had disappeared b…
Far ultraviolet spectroscopy of (non-magnetic) cataclysmic variables
Long, Knox S.
HST and FUSE have provided high signal-to-noise, high-resolution spectra of a variety of cataclysmic variables and have allowed a detailed characterization of FUV emission sources in both high and low states. Here, I describe how this has advanced our understanding of non-magnetic CVs. In the high state, the FUV spectra are dominated by disk emiss…
Exploration of Mars in the SPICAM-IR experiment onboard the Mars-Express spacecraft: 2. Nadir observations: Simultaneous observations of water vapor and O2 glow in the Martian atmosphere
Bertaux, J. -L.; Fedorova, A. A.; Korablev, O. I. +4 more
The SPICAM experiment onboard the Mars-Express spacecraft includes sounding the Martian atmosphere in the ultra-violet (118 320 nm) and near IR (1 1.7 µm) ranges. The infrared spectrometer operates in the range of 1 1.7 µm with a resolution of 3.5 cm-1 in the mode of nadir observations and solar and stellar occulations. This…