Search Publications
Unveiling the Central Parsec Region of an Active Galactic Nucleus: The Circinus Nucleus in the Near-Infrared with the Very Large Telescope
Lutz, D.; Rouan, D.; Meisenheimer, K. +12 more
VLT J- to M'-band adaptive optics observations of the Circinus galaxy on parsec scales resolve a central bright Ks-band source with a FWHM size of 1.9+/-0.6 pc. This source is only visible at wavelengths longward of 1.6 µm and coincides in position with the peak of the [Si VII] 2.48 µm coronal line emission. With respect to …
Green Bank Telescope Discovery of Two Binary Millisecond Pulsars in the Globular Cluster M30
Ransom, Scott M.; Kaspi, Victoria M.; Hessels, Jason W. T. +4 more
We report the discovery of two binary millisecond pulsars in the core-collapsed globular cluster M30 using the Green Bank Telescope (GBT) at 20 cm. PSR J2140-2310A (M30A) is an eclipsing 11 ms pulsar in a 4 hr circular orbit, and PSR J2140-23B (M30B) is a 13 ms pulsar in an as yet undetermined but most likely highly eccentric (e>0.5) and relati…
Location of the Optical Reverse Shock in the Cassiopeia A Supernova Remnant
Chevalier, Roger A.; Borkowski, Kazimierz J.; van den Bergh, Sidney +4 more
We use two epochs of Hubble Space Telescope WFPC2 images separated by 2 yr to determine the location and propagation of the reverse shock (RS) in the young supernova remnant Cassiopeia A (Cas A). The images trace optical line emission from fast-moving knots and filaments of highly processed ejecta as they cross the RS, become heated and compressed…
Open solar flux estimates from near-Earth measurements of the interplanetary magnetic field: comparison of the first two perihelion passes of the Ulysses spacecraft
Forsyth, R.; Balogh, A.; Lockwood, M. +1 more
Available from http://www.copernicus.org/site/EGU/annales/22/4/1395.htm?FrameEngine=false;
Height correction in the measurement of solar differential rotation determined by coronal bright points
Vršnak, B.; Wöhl, H.; Clette, F. +4 more
Full-disc solar images obtained with the Extreme Ultraviolet Imaging Telescope (EIT) on board the Solar and Heliospheric Observatory (SOHO) are used to analyse solar differential rotation by tracing coronal bright points for the period June 4, 1998 to May 22, 1999. A method for the simultaneous determination of the true solar synodic rotation velo…
Tracking a major interplanetary disturbance with SMEI
Price, S.; Simnett, G. M.; Webb, D. F. +14 more
We present the first clear observations of an Earth-directed interplanetary disturbance tracked by the Solar Mass Ejection Imager (SMEI). We find that this event can be related to two halo CMEs seen at the Sun about 2 days earlier, and which merged in transit to 1 AU. The disturbance was seen about 16 hours before it reached Earth,and caused a sev…
Cassini observations of Io's visible aurorae
Geissler, Paul; McEwen, Alfred; Porco, Carolyn +4 more
More than 500 images of Io in eclipse were acquired by the Cassini spacecraft in late 2000 and early 2001 as it passed through the jovian system en route to Saturn (Porco et al., 2003, Science 299, 1541-1547). Io's bright equatorial glows were detected in Cassini's near-ultraviolet filters, supporting the interpretation that the visible emissions …
Synoptic study of the SMC SNRs using XMM-Newton
Kaastra, J. S.; Bleeker, J. A. M.; van der Heyden, K. J.
We present a detailed X-ray spectral analysis of 13 supernova remnants (SNR) in the Small Magellanic Cloud (SMC). We apply both single-temperature non-equilibrium ionisation models and models based on the Sedov similarity solution, where applicable. We also present detailed X-ray images of individual SNRs, which reveal a range of different morphol…
Electric field scales at quasi-perpendicular shocks
André, M.; Horbury, T.; Balikhin, M. +2 more
Available from http://www.copernicus.org/site/EGU/annales/22/7/2291.htm?FrameEngine=false;
Ion winds in Saturn's southern auroral/polar region
Stallard, Tom S.; Miller, Steve; Geballe, Thomas R. +2 more
We present profiles of the line-of-sight (l.o.s.) ionospheric wind velocities in the southern auroral/polar region of Saturn. Our velocities are derived from the measurement of Doppler shifting of the H 3+ν2Q(1,0 -) line at 3.953 microns. The data for this study were obtained using the facility high-reso…