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An XMM-Newton Observation of the Seyfert 2 Galaxy NGC 6300. I. The Nucleus
Awaki, Hisamitsu; Maddox, Larry A.; Leighly, Karen M. +4 more
We present results from a half-day observation by XMM-Newton of the nucleus of the nearby Seyfert 2 galaxy NGC 6300. The X-ray spectrum of the nucleus consists of a heavily absorbed hard component dominating the 3-10 keV band and a soft component seen in the 0.2-2 keV band. In the hard band, the spectrum is well fitted by a power-law model with ph…
NGC 6543. I. Understanding the Anatomy of the Cat's Eye
Balick, Bruce
Hubble Space Telescope images of NGC 6543 taken in 1994.7 through a variety of narrowband filters yield a very detailed structure in emission lines of low and moderate ionization. On the whole, the core of NGC 6543 is optically thin to ionizing radiation. As expected, the general ionization state of the nebula decreases with radius; however, some …
Spatial and temporal properties of AKR burst emission derived from Cluster WBD VLBI studies
Gurnett, D.; Mutel, R.; Christopher, I.
Available from http://www.copernicus.org/site/EGU/annales/22/7/2625.htm?FrameEngine=false;
XMM-Newton observations of three short-period polars: V347 Pav, GG Leo and EU UMa
Cropper, Mark; Ramsay, Gavin; Priedhorsky, W. +2 more
We present phase-resolved XMM-Newton data of three short-period polars: V347 Pav, GG Leo and EU UMa. All three systems show one dominant accretion region, which is seen for approximately half the orbital cycle. GG Leo shows a strong dip feature in its X-ray and ultraviolet (UV) light curves, which is due to absorption of X-rays from the accretion …
On the importance of the few most massive stars: The ionizing cluster of NGC 588
Vílchez, J. M.; González Delgado, R. M.; Cerviño, M. +3 more
We present the results of a double analysis of the ionizing cluster in
Magnetohydrodynamic Models of the Bipolar Knotty Jet in Henize 2-90
Lee, Chin-Fei; Sahai, Raghvendra
A remarkably linear, bipolar, knotty jet was recently discovered in Hen 2-90, an object classified as a young planetary nebula. Using two-dimensional, magnetohydrodynamic simulations, we investigate periodic variations in jet density and velocity as the mechanism for producing the jet and its knotty structures. From a detailed comparison between t…
Low-energy particle response to CMEs during the Ulysses solar maximum northern polar passage
Lario, D.; Reisenfeld, D. B.; Roelof, E. C. +2 more
Near the end of 2001, the Ulysses spacecraft transited the northern polar regions of the heliosphere, above heliographic latitudes of 71°N. During this period (September-November 2001), Ulysses remained immersed in polar coronal hole solar wind flow and observed five intense solar energetic particle events and five interplanetary coronal mass ejec…
Cometary Ions Trapped in a Coronal Mass Ejection
Geiss, J.; Jones, G. H.; McComas, D. J. +5 more
Ion tails of comets are known to extend radially away from the Sun over very large distances. Crossing these tails by spacecraft not specifically targeted to intercept them was believed to be extremely improbable, since that requires precise angular alignment of the spacecraft with a comet. We report here the fortuitous detection of cometary ions …
Accretion and Outflow in the Active Galactic Nucleus and Starburst of NGC 5135
Heckman, T. M.; Levenson, N. A.; Weaver, K. A. +2 more
Observations of the Seyfert 2 and starburst galaxy NGC 5135 with the Chandra X-Ray Observatory demonstrate that both of these phenomena contribute significantly to its X-ray emission. We spatially isolate the active galactic nucleus (AGN) and demonstrate that it is entirely obscured by column density NH>1024 cm-2
Physical interpretation of the NGC 7469 UV/X-ray variability
Maraschi, L.; Nandra, K.; Petrucci, P. O. +1 more
We present a re-analysis of the simultaneous ∼30 day IUE/XTE observation of NGC 7469 done in 1996. Our main progress in this paper, in comparison to previous spectral analyses (Nandra et al. \cite{nan98,nan00}), is to adopt and fit directly to the data a detailed model of the Comptonized spectrum. This firstly allows one to fit simultaneously the …