Search Publications
Proper Motions of Dwarf Spheroidal Galaxies from Hubble Space Telescope Imaging. II. Measurement for Carina
Minniti, Dante; Mateo, Mario; Piatek, Slawomir +4 more
This article presents and discusses a measurement of the proper motion for the Carina dwarf spheroidal galaxy (dSph) from images in two distinct fields in the direction of Carina taken with the Hubble Space Telescope, at three epochs. Each field contains a confirmed quasi-stellar object that is the reference point for measuring the proper motion o…
Multiwavelength studies of the Seyfert 1 galaxy NGC 7469 II. X-ray and UV observations with XMM-Newton
Kaastra, J. S.; Kriss, G. A.; Behar, E. +6 more
We present an XMM-Newton observation of NGC 7469, including studies of the X-ray and UV variability, 0.2-10 keV spectral continuum, Fe Kalpha emission line and the first-ever high-resolution X-ray spectrum of the soft X-ray warm absorber. We compare the properties of this X-ray warm absorber with the UV warm absorber as seen in a FUSE observation …
Constraints on Coronal Mass Ejection Dynamics from Simultaneous Radio and White-Light Observations
Burkepile, J. T.; Kaiser, M. L.; Howard, R. A. +5 more
Simultaneous radio and white-light observations are used to deduce information on the dynamics of two coronal mass ejection (CME) events that occurred about 2 hr apart on 2001 January 20 and that were associated with eruptions from the same active region on the Sun. The analysis combines both space-based and ground-based data. The radio data were …
Solitary potential structures observed in the magnetosheath by the Cluster spacecraft
Gurnett, D. A.; Balogh, A.; Pickett, J. S. +4 more
Bipolar pulses of ~ 25-100 µs in duration have been observed in the wave electric field data obtained by the Wideband plasma wave instrument on the Cluster spacecraft in the dayside magnetosheath. These pulses are similar in almost all respects to those observed on several spacecraft over the last few years. They represent solitary potential struc…
Can a Dusty Warm Absorber Model Reproduce the Soft X-Ray Spectra of MCG -6-30-15 and Markarian 766?
Kahn, Steven M.; Paerels, Frits; Behar, Ehud +8 more
XMM-Newton RGS spectra of MCG -6-30-15 and Mrk 766 exhibit complex discrete structure, which was interpreted in a paper by Branduardi-Raymont and coworkers as evidence for the existence of relativistically broadened Lyα emission from carbon, nitrogen, and oxygen, produced in the innermost regions of an accretion disk around a Kerr black hole. This…
The Siberian Solar Radio Telescope: the current state of the instrument, observations, and data
Grechnev, V. V.; Uralov, A. M.; Altyntsev, A. T. +8 more
The Siberian Solar Radio Telescope (SSRT) is one of the world's largest solar radio heliographs. It commenced operation in 1983, and since then has undergone several upgrades. The operating frequency of the SSRT is 5.7 GHz. Since 1992 the instrument has had the capability to make one-dimensional scans with a high time resolution of 56 ms and an an…
Resolved Mid-Infrared Emission in the Narrow-Line Region of NGC 4151
Robinson, A.; De Buizer, James M.; Radomski, James T. +4 more
We present subarcsecond-resolution mid-infrared images of NGC 4151 at 10.8 and 18.2 µm. These images were taken with the University of Florida mid-IR camera/spectrometer OSCIR at the Gemini North 8 m telescope. We resolve emission at both 10.8 and 18.2 µm, extending ~3.5" across at a P.A. of ~60°. This coincides with the narrow-line re…
Slow Magnetosonic Solitons Detected by the Cluster Spacecraft
Lavraud, B.; Buchert, S.; Gustafsson, G. +4 more
Experimental evidence is provided for the existence of slow-mode magnetosonic solitons in the collisionless plasma at the magnetopause boundary layer. The solitons were detected by the fleet of Cluster spacecraft at the dusk flank of the magnetosphere as magnetic field depressions (up to 85%) accompanied with enhancement of the plasma density an…
H2 infrared line emission across the bright side of the rho Ophiuchi main cloud
Boulanger, F.; Abergel, A.; Falgarone, E. +3 more
We present imaging and spectroscopic observations of dust and gas (H2) emission, obtained with ISO, from the western edge of the rho Ophiuchi molecular cloud illuminated by the B2 star HD147889 (chi ~ 400). This photodissociation region (PDR) is one of the nearest PDRs to the Sun (d = 135 +/- 15 pc from the stellar parallax) and the lay…
INTEGRAL Spectrometer SPI's GRB detection capabilities. GRBs detected inside SPI's FoV and with the anticoincidence system ACS
Hurley, K.; Hanlon, L.; McBreen, B. +16 more
The spectrometer SPI, one of the two main instruments of the INTEGRAL spacecraft, offers significant gamma-ray burst detection capabilities. In its 35o (full width) field of view SPI is able to localise gamma-ray bursts at a mean rate of ~ 0.8/month. With its large anticoincidence shield of 512 kg of BGO crystals SPI is able to detect g…