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Two Active Nuclei in 3C 294
Stockton, Alan; Canalizo, Gabriela; Ridgway, Susan E. +1 more
The z=1.786 radio galaxy 3C 294 lies < 10" from a 12 mag star and has been the target of at least three previous investigations using adaptive optics (AO) imaging. A major problem in interpreting these results is the uncertainty in the precise alignment of the radio structure with the H- or K-band AO imaging. Here we report observations of the …
X-ray detections of two young bona-fide brown dwarfs
Bouy, H.
I report the detection of two bona-fide brown dwarfs by XMM-Newton:
Magnetic signatures of Jupiter's bow shock during the Cassini flyby
Dougherty, Michele K.; Crary, F.; Young, D. T. +1 more
The bow shock crossings detected during the Cassini flyby of Jupiter occur at positions which imply that Jupiter's bow shock was relatively inflated during the early (before 2001, Day 3) and late (after 2001, Day 40) periods of the encounter. A variety of magnetic shock signatures are seen, corresponding to a wide range (15-75 degrees) in the angl…
Cluster observations of a complex high-altitude cusp passage during highly variable IMF
Balogh, A.; Lavraud, B.; Rème, H. +12 more
On 26 February 2001, the Cluster spacecraft were outbound over the Northern Hemisphere, at approximately 12:00 MLT, approaching the magnetosheath through the high-altitude (and exterior) cusp region. Due to macroscopic motions of the cusp, the spacecraft made multiple entries into the exterior cusp region before exiting into the magnetosheath, pre…
The Density and Masses of Obscured Black Holes
Comastri, Andrea; Fiore, Fabrizio
Recent Chandra and XMM-Newton surveys have uncovered a large fraction of the obscured AGN responsible of the hard X-ray background. One of the most intriguing results of extensive programs of follow-up observations concerns the optical and near-infrared properties of the hard X-ray sources counterparts. More specifically, for a significant fractio…
Cassini Plasma Spectrometer electron measurements close to the magnetopause of Jupiter
Coates, A. J.; Linder, D. R.; Young, D. T. +2 more
During late 2000 and early 2001 the Cassini satellite made a flyby of Jupiter en route to Saturn. The flyby speed was about 20 km/s, and the trajectory brought the spacecraft through the magnetosheath on the afternoonside. The Cassini Plasma Spectrometer (CAPS) instrument, consisting of two ion sensors and an electron spectrometer, was thus able t…
Source characteristics and radiation mechanism of Jovian anomalous continuum
Misawa, H.; Tsuchiya, F.; Morioka, A. +2 more
We investigate the characteristics of the Jovian anomalous continuum (JAC) in interplanetary space and in the magnetosheath, using Ulysses observations. Some new source characteristics of JAC were obtained in addition to those found by previous authors [e.g., , 1998]. JAC tends to occur when the solar wind dynamic pressure decreases after a rapid …
Characterization of Intensity Variations Along Fe XIV Coronal Loops - A Case Study
Stenborg, Guillermo; Costa, Andrea
We discuss a method, and corresponding results, to analyze the dynamics of localized small-scale coronal (post-flare) loops observed with the MICA (Mirror Coronagraph for Argentina) telescope in the well-known green coronal line at 530.3 nm. In particular, we designed a procedure to measure intensity variations along the structure of a loop, both …
Calibration of Hubble Space Telescope Advanced Camera for Surveys Emission-Line Filters
O'Dell, C. R.
The most commonly used narrowband filters of the Advanced Camera for Surveys (ACS) on the Hubble Space Telescope do not allow the clear delineation of individual emission lines as done with the more narrow field-of-view Wide Field and Planetary Camera. However, we have determined the calibration characteristics that allow separation of the Hα and …
Resolving X-Ray Sources from B Stars Spectroscopically: The Example of µ Leporis
Güdel, Manuel; Kahn, Steven M.; Behar, Ehud +4 more
We present high-resolution X-ray observations of the chemically peculiar late-type B star µ Lep. However, we find spectroscopic and astrometric evidence, which shows that the X-rays are not traced back to the B star itself but rather to a previously unresolved companion, µ Lep-B, whose X-ray spectrum resembles that of a coronally activ…