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Derivation of planetary topography using multi-image shape-from-shading
Kirk, Randolph L.; Lohse, Volker; Heipke, Christian
In many cases, the derivation of high-resolution digital terrain models (DTMs) from planetary surfaces using conventional digital image matching is a problem. The matching methods need at least one stereo pair of images with sufficient texture. However, many space missions provide only a few stereo images and planetary surfaces often possess insuf…
Multiwavelength Variability of the Magnetar 4U 0142+61
Durant, Martin; van Kerkwijk, Marten H.
We have collected data spanning seven years of observations of the magnetar 4U 0142+61 in the infrared, optical, and soft X-rays. These combine our own observations and analysis of archival data. We find that the source is variable in the optical, in contrast to what had been previously reported, that the K-band flux can vary by over a magnitude o…
Can Ejecta-dominated Supernova Remnants be Typed from Their X-Ray Spectra? The Case of G337.2-0.7
Gelfand, Joseph D.; Hughes, John P.; Gaensler, B. M. +3 more
In this paper we use recent X-ray and radio observations of the ejecta-rich Galactic SNR G337.2-0.7 to determine properties of the SN explosion that formed this source. H I absorption measurements from ATCA constrain the distance to G337.2-0.7 to lie between 2.0+/-0.5 and 9.3+/-0.3 kpc. Combined with a clear radio image of the outer blast wave, th…
Detailed XMM-Newton Observation of the Cluster of Galaxies Abell 1060
Ishida, Manabu; Hoshino, Akio; Ohashi, Takaya +3 more
We present results from an XMM-Newton observation of the non-cooling flow cluster Abell 1060. The large effective area of XMM-Newton enabled us to investigate the nature of this cluster in unprecedented detail. >From the observed surface brightness distribution, we found that the gravitational mass distribution is well described by the Navarro-…
A global magnetic model of Saturn's magnetosphere and a comparison with Cassini SOI data
Alexeev, I. I.; Belenkaya, E. S.; Nichols, J. D. +4 more
A re-scaling of a recent model of Jupiter's magnetosphere incorporating ring current, magnetopause, and tail current systems is used as a starting-point for modeling Saturn's magnetospheric field. The model is compared with observations obtained by Cassini during its Saturn orbit insertion fly-through of Saturn's magnetosphere, and is shown to giv…
XMM-Newton Observations of High-Redshift Quasars
Grupe, D.; Mathur, S.; Wilkes, B. +1 more
We report on our XMM-Newton observations of the high-redshift quasars BR 2237-0607 (z=4.558) and BR 0351-1034 (z=4.351). We also report on XMM-Newton observations of 19 other z>4 objects available in the public archive of which 14 were detected. We find that the optical to X-ray spectral index αox is correlated with the luminosity density at 25…
Evidence for Surface Cooling Emission in the XMM-Newton Spectrum of the X-Ray Pulsar PSR B2334+61
Cropper, M.; McGowan, K. E.; Zane, S. +2 more
We report on the first XMM-Newton observation of the Vela-like pulsar PSR B2334+61. Spectral analysis reveals soft X-ray emission, with the bulk of the photons emitted at energies below ~1.5 keV. We find that the spectrum has a thermal origin and is well-fitted with either a blackbody or a magnetized, pure H atmospheric model. In the latter case, …
The Redshift Distribution of Distant Supernovae and Its Use in Probing Reionization
Johnson, Benjamin D.; Haiman, Zoltán; Mesinger, Andrei
We model the number of detectable supernovae (SNe) as a function of redshift at different flux thresholds, making use of the observed properties of local SNe, such as their light curves, fiducial spectra, and peak magnitude distributions. We assume that the star formation rate (SFR) at high redshift traces the formation rate of dark matter halos. …
Oscillations in a solar filament: first observation of long periods in the HeI 584.33 Å line, modelling and diagnostic
Bocchialini, K.; Pouget, G.; Solomon, J.
Three long observations of filaments were carried out in the 584.33 HeI line during MEDOC campaigns in November 2003 and November 2004, by the Coronal Diagnostic Spectrometer onboard SOHO. Their duration was 15-16 h and the temporal resolution was 20 s, allowing measurements of the entire range of periodicities theoretically expected in a filament…
Rotation of Solar Corona from Tracking of Coronal Bright Points
Pevtsov, Alexei A.; Sattarov, Isroil; Karachik, Nina
An automated procedure for identification of coronal bright points is applied to selected EIT images observed at various phases of the solar cycle. The procedure finds about 400 bright points on a single EIT image observed at 195 Å. The positions of the bright points are tracked to study the profile of solar rotation in the solar corona. It is sho…