Search Publications
X-rays from the Symbiotic Star RX Pup
Sokoloski, J. L.; Costa, Roberto D. D.; Luna, Gerardo J. M.
We describe X-ray and optical observations of the symbiotic star RX Pup. From low resolution optical spectra, we obtain a reddening for RX Pup of E(B‑V)=0.79. We use the neutral column density corresponding to this reddening as a lower limit for the X-ray spectra fits. The X-ray spectra can be fitted with either a two-temperarure thermal plasma mo…
Reconstructed global feature of an interplanetary disturbance for the full-halo coronal mass ejection event on 1999 September 20
Nakagawa, T.; Tokumaru, M.; Kojima, M. +2 more
Traveling interplanetary (IP) disturbances associated with the full-halo coronal mass ejection (CME) which occurred on September 20, 1999, were observed clearly with the 327-MHz interplanetary scintillation (IPS) system of the Solar-Terrestrial Environment Laboratory of Nagoya University. In this study, we retrieved the global features of the IP d…
Proper Motions of Faint Ultraviolet-bright Sources in the Sandage Two-Color Survey of the Galactic Plane
Lépine, Sébastien; Lanning, Howard H.
Proper motions with values >=10 or <=-10 mas yr-1 have been extracted from the USNO-B1.0 and Tycho-2 catalogs for all Lanning UV-bright sources identified in the Sandage Two-Color Survey of the Galactic Plane and presented in Papers I-VI. Of the 572 sources examined, we find at least 213 that exhibit a significantly large proper m…
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…