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An XMM-Newton observation of Ton S180: constraints on the continuum emission in ultrasoft Seyfert galaxies
Brandt, W. N.; Vaughan, S.; Fabian, A. C. +3 more
We present an XMM-Newton observation of the bright, narrow-line, ultrasoft type 1 Seyfert galaxy Ton S180. The 0.3-10 keV X-ray spectrum is steep and curved, showing a steep slope above 2.5 keV (Γ~ 2.3) and a smooth, featureless excess of emission at lower energies. The spectrum can be adequately parametrized using a simple double power-law model.…
The X-Ray Source at the Center of the Cassiopeia A Supernova Remnant
Tiengo, A.; Mereghetti, S.; Israel, G. L.
We present the first results of an XMM-Newton observation of the central X-ray source in the Cas A supernova remnant. The spectrum can be fitted equally well with an absorbed steep power law (αph~3, NH~1.5×1022 cm-2) or with a bremsstrahlung with temperature kT~2.4 keV and NH~1022 c…
ISO LWS Observations of the Two Nearby Spiral Galaxies NGC 6946 and NGC 1313
Dale, Daniel A.; Rubio, Monica; Rubin, Robert H. +8 more
We present the analysis of Infrared Space Observatory long-wavelength spectrometer (LWS) observations of the two nearby late-type galaxies NGC 1313 and NGC 6946. Both galaxies have been fully mapped in the [C II] far-infrared fine-structure line at 158 µm, and some regions have been observed also in the [O I] 63 µm and [N II] 122 &micr…
Hubble Space Telescope/NICMOS Observations of Terzan 5: Stellar Content and Structure of the Core
Cohn, Haldan N.; Lugger, Phyllis M.; Edmonds, Peter D. +1 more
We report results from Hubble Space Telescope/NICMOS imaging of the extremely dense core of the globular cluster Terzan 5. This highly obscured bulge cluster contains a low-mass X-ray binary and at least two millisecond pulsars, with evidence for a large millisecond pulsar population. It has been estimated to have one of the highest collision rate…
X-Ray Bright Points and Photospheric Bipoles during Cycles 22 and 23
Pevtsov, Alexei A.; Sattarov, Isroil; Hojaev, Alisher S. +1 more
We use the Yohkoh soft X-ray telescope (SXT) full-disk images made from 1993 to 2000 to manually identify X-ray bright points (XBPs). We also employ the National Solar Observatory (Kitt Peak) full-disk longitudinal magnetograms made between 1992 April and 2001 April and an automatic procedure to identify photospheric bipoles whose magnetic field s…
Organic Chemistry and Exobiology on Titan
Owen, Tobias; Raulin, François
Exobiology is not only the study of the origin, distribution and evolution of life in the universe, but also of structures — including at the molecular level, and processes — including organic chemical transformations — related to life. In that respect, with its dense nitrogen atmosphere, which includes a noticeable fraction of methane, and the ma…
Thermal Pressures in Neutral Clouds inside the Local Bubble, as Determined from C I Fine-Structure Excitations
Jenkins, Edward B.
High-resolution spectra covering the absorption features from interstellar C I were recorded for four early-type stars with spectrographs on the Hubble Space Telescope, in a program to measure the fine-structure excitation of this atom within neutral clouds inside or near the edge of the Local Bubble, a volume of hot (T~106K) gas that e…
Cluster observations of fast magnetosonic waves in the terrestrial foreshock
Balogh, A.; Dandouras, I.; Eastwood, J. P. +2 more
Cluster observations of ULF waves in the terrestrial foreshock are presented. Four spacecraft timing techniques on magnetic field measurements are used with plasma bulk velocity measurements to determine wave properties in the plasma rest frame. Based on the propagation speed and polarisation, the waves are found to be fast magnetosonic. The analy…
Magnetospheric and Plasma Science with Cassini-Huygens
Gurnett, D. A.; Dougherty, M. K.; Tsurutani, B. T. +27 more
Magnetospheric and plasma science studies at Saturn offer a unique opportunity to explore in-depth two types of magnetospheres. These are an ‘induced’ magnetosphere generated by the interaction of Titan with the surrounding plasma flow and Saturn's ‘intrinsic’ magnetosphere, the magnetic cavity Saturn's planetary magnetic field creates inside the …
The underlying direction of the heliospheric magnetic field through the Ulysses first orbit
Balogh, A.; Forsyth, R. J.; Smith, E. J.
Between February 1992 and April 1998 the Ulysses spacecraft carried out the first survey of how the properties of the solar wind and heliospheric magnetic field vary with latitude during the declining and minimum phases of the solar cycle. In this paper we report on how the underlying direction of the heliospheric magnetic field varied through the…