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Some Like It Hot: The X-Ray Emission of the Giant Star YY Mensae
Skinner, Stephen L.; Güdel, Manuel; Audard, Marc +3 more
We present an analysis of the X-ray emission of the rapidly rotating giant star YY Mensae observed by Chandra HETGS and XMM-Newton. The high-resolution spectra display numerous emission lines of highly ionized species; Fe XVII to Fe XXV lines are detected, together with H-like and He-like transitions of lower Z elements. Although no obvious flare …
Clean Optical Spectrum of the Radio Jet of 3C 120
Christensen, L.; Mediavilla, E.; Sánchez, S. F. +2 more
We present integral field spectroscopy (IFS) of the central region of 3C 120. We have modeled the nuclear and host galaxy three-dimensional spectra using techniques normally applied to imaging, decoupling both components and obtaining a residual data cube. Using this residual data cube, we detected the extended emission line region associated with…
Evidence for temporal change at Uranus' south pole
Hammel, H. B.; Rages, K. A.; Friedson, A. J.
Analysis of Hubble Space Telescope images of Uranus taken between 1994 and 2002 shows evidence for temporal changes in zonal brightness patterns in the south polar region. Between 1994 and 2002, a relatively bright ring developed near 70° S. The pole itself, which was the brightest area of the southern hemisphere in 1994, has become relatively dar…
Evolution of the Martian atmosphere and hydrosphere: Solar wind erosion studied by ASPERA-3 on Mars Express
Lundin, Rickard; Barabash, Stanislav
The evolution of the Martian atmosphere and the potential existence of a past hydrosphere is a scientific issue of great interest in planetary research. Although the first missions to Mars had a focus on surface features and atmospheric properties, some of the missions (e.g., The Soviet Mars 2, 3 and 5) also carried instruments addressing the sola…
Intrinsic absorbers in BL Lac objects: The XMM-Newton view
Page, M. J.; Branduardi-Raymont, G.; Blustin, A. J.
We present XMM-Newton observations of four BL Lac objects (
The global mass function of M 15
Pulone, L.; De Marchi, G.; Pasquali, A. +1 more
Data obtained with the NICMOS instrument on board the Hubble Space Telescope (HST) have been used to determine the H-band luminosity function (LF) and mass function (MF) of three stellar fields in the globular cluster M 15, located ∼7' from the cluster centre. The data confirm that the cluster MF has a characteristic mass of ∼0.3 M⊙, as…
Observations Indicating That ~1 × 107 K Solar Flare Plasmas May Be Produced in Situ from ~1 × 106 K Coronal Plasma
Landi, E.; Doschek, G. A.; Feldman, U. +1 more
We discuss a set of flare observations obtained at a position of 0.10 Rsolar above the solar northwest limb. The data were acquired by the Solar Ultraviolet Measurement of Emitted Radiation (SUMER) spectrometer on the Solar and Heliospheric Observatory (SOHO). We derive time-dependent comparisons of physical properties, such as electron…
A Preliminary Observational Search for Circumbinary Disks around Cataclysmic Variables
Howell, Steve B.; Holberg, J. B.; Belle, Kunegunda E. +2 more
Circumbinary (CB) disks have been proposed as a mechanism to extract orbital angular momentum from cataclysmic variables (CVs) during their evolution. As proposed by Taam & Spruit, these disks extend outward to several astronomical units and should be detected observationally via their infrared flux or by absorption lines in the ultraviolet sp…
On the evolution of the solar wind between 1 and 5 AU at the time of the Cassini Jupiter flyby: Multispacecraft observations of interplanetary coronal mass ejections including the formation of a merged interaction region
Dougherty, M. K.; Young, D. T.; Owens, M. J. +5 more
The Cassini flyby of Jupiter occurred at a time near solar maximum. Consequently, the pre-Jupiter data set reveals clear and numerous transient perturbations to the Parker Spiral solar wind structure. Limited plasma data are available at Cassini for this period due to pointing restrictions imposed on the instrument. This renders the identification…
Lower Mass Black Holes in the Great Observatories Origins Deep Survey? Off-nuclear X-Ray Sources
Hornschemeier, A. E.; Chary, R.; Alexander, D. M. +9 more
We have identified a sample of 10 highly reliable off-nuclear (>~2 kpc) X-ray sources at z=0.03-0.25 in late-type host galaxies within the two Great Observatories Origins Deep Survey (GOODS) fields (i.e., the two Chandra Deep Fields). The combination of the superb spatial resolution and great depth of the Hubble Space Telescope Advanced Camera …