Search Publications
Can Cassini detect a subsurface ocean in Titan from gravity measurements?
Iess, Luciano; Tortora, Paolo; Lunine, Jonathan I. +6 more
Recent models of Titan's interior predict that the satellite contains an ocean of water and ammonia under an icy layer. Direct evidence for the presence of an ocean can be provided on the Cassini mission only by radio science determination of Titan Love number k. Simulations that use the five flybys T11, T22 T33, T45, and T68 (the latter two belon…
Coronal Hard X-Ray Emission Associated with Radio Type III Bursts
Krucker, Säm; Bale, S. D.; Lin, R. P. +4 more
We report on a purely coronal hard X-ray source detected in a partially disk-occulted solar flare by the Reuven Ramaty High Energy Solar Spectroscopic Imager (RHESSI) that is associated with radio type III bursts and a suprathermal electron event detected near 1 AU by the WIND 3-D Plasma and Energetic Particle (3DP) instrument. Several observation…
Combining remote and in situ observations of coronal mass ejections to better constrain magnetic cloud reconstruction
Owens, M. J.
Determination of the nonradial extent of magnetic clouds (MCs) is vital for two key reasons. First, it affects the amount of "drag" a fast MC experiences and therefore controls the travel time from the Sun to 1-AU, a critical parameter for space-weather prediction. Second, it is vital to estimating the flux content of MCs, which in turn is importa…
The measurement errors in the Swift-UVOT and XMM-OM
Kuin, N. P. M.; Rosen, S. R.
The probability of photon measurement in some photon-counting instrumentation, such as the Optical Monitor (OM) on the XMM-Newton satellite, and the Ultraviolet/Optical Telescope (UVOT) on the Swift satellite, does not follow a Poisson distribution due to the detector characteristics, but a binomial distribution. For a single-pixel approximation, …
Suzaku Spectroscopy of Extended X-Ray Emission in M17
Hamaguchi, Kenji; Maeda, Yoshitomo; Tsujimoto, Masahiro +5 more
We present the results of a Suzaku spectroscopic study of soft extended X-ray emission in the HII region of M17. The spectrum of the extended emission was obtained with a high signal-to-noise ratio in a spatially resolved manner using the X-ray Imaging Spectrometer (XIS). We established that contamination by unresolved point sources, the Galactic …
Testing the galaxy cluster mass-observable relations at z = 1 with XMM-Newton and Chandra observations of XLSSJ022403.9-041328
Valtchanov, I.; Pierre, M.; Willis, J. +7 more
We present an analysis of deep XMM-Newton and Chandra observations of the z = 1.05 galaxy cluster XLSSJ022403.9-041328 (hereafter XLSSC029), detected in the XMM-Newton Large Scale Structure survey. Density and temperature profiles of the X-ray emitting gas were used to perform a hydrostatic mass analysis of the system. This allowed us to measure t…
X-rays from Venus observed with Chandra
Dennerl, Konrad
X-ray observations of Venus are so challenging that the first detection of Venusian X-rays succeeded only in January 2001, with the Chandra satellite. The X-rays from Venus were found to result from fluorescent scattering of solar X-rays in the Venusian thermosphere. An additional component, caused by charge exchange of highly charged heavy ions i…
Supernova remnants with magnetars: Clues to magnetar formation
Vink, Jacco
In this paper I discuss the lack of observational evidence that magnetars are formed as rapidly rotating neutron stars. Supernova remnants containing magnetars do not show the excess of kinetic energy expected for such a formation scenario, nor is there any evidence for a relic pulsar wind nebula. However, it could be that magnetars are formed wit…
New Young Brown Dwarfs in the Orion Molecular Cloud 2/3 Region
Luhman, K. L.; Smith, J. D.; Megeath, S. T. +7 more
Forty new low-mass members with spectral types ranging from M4 to M9 have been confirmed in the Orion Molecular Cloud (OMC) 2/3 region. Through deep, I-, z'-, J-, H-, and K-band photometry of a 20' × 20' field in OMC 2/3, we selected brown dwarf candidates for follow-up spectroscopy. Low-resolution far-red and near-infrared spectra were obtained f…
ACS imaging of star clusters in M 51. II. The luminosity function and mass function across the disk
Larsen, S. S.; Gieles, M.; Lamers, H. J. G. L. M. +2 more
Context: Whether or not there exists a physical upper mass limit for star clusters is as yet unclear. For small cluster samples the mass function may not be sampled all the way to the truncation, if there is one. Data for the rich cluster population in the interacting galaxy M 51 enables us to investigate this in more detail.
Aims: Using HST/A…