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Multiwavelength XMM-Newton observations of the Laor et al. sample of PG quasars
Schady, P.; Mason, K. O.; Starling, R. L. C. +3 more
We present XMM-Newton/EPIC spectra for the Laor et al. sample of Palomar Green (PG) quasars. We find that a power law provides a reasonable fit to the 2-5 keV region of the spectra. Excess soft X-ray emission below 2 keV is present for all objects, with the exception of those known to contain a warm absorber. However, a single power law is a poor …
Suzaku observations of iron lines and reflection in AGN
Kataoka, J.; Fabian, A. C.; Takahashi, T. +8 more
Initial results on the iron K-shell line and reflection component in several AGN observed as part of the Suzaku Guaranteed Time program are reviewed. This paper discusses a small sample of Compton-thin Seyferts observed to date with Suzaku; namely MCG -5-23-16, MCG -6-30-15, NGC 4051, NGC 3516, NGC 2110, 3C 120 and NGC 2992. The broad iron K\alpha…
On the excitation of ULF waves by solar wind pressure enhancements
Glassmeier, K. -H.; Blomberg, L. G.; Schaefer, S. +1 more
We study the onset and development of an ultra low frequency (ULF) pulsation excited by a storm sudden commencement. On 30 August 2001, 14:10 UT, the Cluster spacecraft are located in the dayside magnetosphere and observe the excitation of a ULF pulsation by a threefold enhancement in the solar wind dynamic pressure. Two different harmonics are ob…
Multiwavelength Observations of EXO 0748-676. II. Emission-Line Behavior
O'Brien, K.; King, A. R.; Nelemans, G. +6 more
We present optical and ultraviolet spectra, light curves, and Doppler tomograms of the low-mass X-ray binary EXO 0748-676. Using an extensive set of 15 emission-line tomograms, we show that, along with the usual emission from the stream and ``hot spot,'' there is extended nonaxisymmetric emission from the disk rim. Some of the emission and Hα and …
Lensing Magnification of Supernovae in the GOODS Fields
Goobar, A.; Mörtsell, E.; Lee, K. +3 more
Gravitational lensing of high-redshift supernovae is potentially an important source of uncertainty when cosmological parameters are being derived from the measured brightness of Type Ia supernovae, especially in deep surveys with scarce statistics. Photometric and spectroscopic measurements of foreground galaxies along the lines of sight of 33 su…
An XMM-Newton survey of the Local Group galaxy M 33 - variability of the detected sources
Pietsch, W.; Haberl, F.; Hatzidimitriou, D. +3 more
We present an analysis of the individual observations of a deep XMM-Newton survey of the Local Group spiral galaxy M 33. We detected a total of 350 sources with fluxes (in the 0.2-4.5 keV energy band) in the range 6.7 × 10-16-1.5 × 10-11 erg s-1. This comprehensive study considers flux variability, spectral charact…
Pseudobulges in the Disk Galaxies NGC 7690 and NGC 4593
Kormendy, John; Knapen, Johan H.; Cornell, Mark E. +2 more
We present Ks-band surface photometry of NGC 7690 (Hubble type Sab) and NGC 4593 (SBb). We find that, in both galaxies, a major part of the ``bulge'' is as flat as the disk and has approximately the same color as the inner disk. In other words, the ``bulges'' of these galaxies have disklike properties. We conclude that these are example…
Footpoint Motion of the Continuum Emission in the 2002 September 30 White-Light Flare
Ding, M. D.; Chen, Q. R.
We present observations of the 2002 September 30 white-light flare, in which the optical continuum emission near the Hα line is enhanced by ~10%. The continuum emission exhibits a close temporal and spatial coincidence with the hard X-ray (HXR) footpoint observed by RHESSI. We find a systematic motion of the flare footpoint seen in the continuum e…
Thermal interactions of the Huygens probe with the Titan environment: Constraint on near-surface wind
Lorenz, Ralph D.
The Huygens probe lost heat to its cold environment during its descent through Titan's atmosphere and after landing. Here I report measurements of the probe's thermal behavior and comparison with ground tests (1) to provide a context for other scientific investigations, such as the release of volatiles from the landing site, and (2) to place const…
First ENA observations at Mars: Charge exchange ENAs produced in the magnetosheath
Coates, A. J.; Kallio, E.; Fedorov, A. +44 more
Measurements of energetic neutral atoms (ENA) generated in the magnetosheath at Mars are reported. These ENAs are the result of charge exchange collisions between solar wind protons and neutral oxygen and hydrogen in the exosphere of Mars. The peak of the observed ENA flux is 1.3×10 msrs. For the case studied here, i.e., the passage of Mars Expres…