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Wind-Ulysses source location of radio emissions associated with the January 1997 coronal mass ejection
Maksimovic, M.; Kaiser, M. L.; Bougeret, J. -L. +2 more
We investigate the 3-D source location of interplanetary type Il-like radio bursts from observations involving two spacecraft. Uncommon type II radio emissions were observed simultaneously on 8 January 1997 by the Wind and Ulysses spacecraft and are believed to be associated with the Interplanetary Coronal Mass Ejection detected on 6-7 January by …
A radio-jet-galaxy interaction in 3C 441
Rawlings, Steve; Lacy, Mark; Ridgway, Susan E. +1 more
Multiwavelength imaging and spectroscopy of the z=0.708 radio galaxy 3C 441 and a red aligned optical/infrared component are used to show that the most striking aspect of the radio-optical `alignment effect' in this object is due to the interaction of the radio jet with a companion galaxy in the same group or cluster. The stellar population of the…
Deep Spectroscopy in the Field of 3C 212
Stockton, Alan; Ridgway, Susan E.
We present the results of long-slit and multiaperture spectroscopy of faint galaxies in the field of the z = 1.049 quasar 3C 212. We show that an apparently aligned optical feature beyond the northwest radio lobe has a redshift z = 0.928, and a similarly aligned feature just beyond the southeast radio lobe has a redshift z = 1.053, quite close to …
Modelling the 10-image lensed system B1933+503
Nair, S.
A gravitational lens model is presented for the newly discovered 10-image system B1933+503. The underlying object, revealed by modelling, is a triple radio source on the scale of a couple of hundred mas that is well-aligned along the line of sight with a foreground and somewhat flattened lensing galaxy, the orientation and location of which match …
ISOCAM images of the `elephant trunks' in M16
Blommaert, Joris A. D. L.; Altieri, Bruno; Pilbratt, Goeran L. +3 more
We have used ISOCAM to obtain images of the `elephant trunks' in the M16 `Eagle nebula' in the two broadband filters LW2 (5-8.5mu m) and LW3 (12-18mu m). These pillars are clearly seen in both our filters, their emission has a colour temperature in the range 250-320K. We have also detected bright extended emission in the LW3 filter, in an area out…
Corotating Particle Events
Simnett, G. M.; Kunow, H.; Horbury, T. +8 more
The corotating particle events give us a unique opportunity to probe the three-dimensional structures of the heliosphere. This is especially true if we have observations over a period of extreme stability of the CIRs, such as existed over the recent solar minimum. We discuss how the observations fit into the context of current heliospheric magneti…
A Search for Ultrarapid Microvariability in the Seyfert Galaxy NGC 7469 with the Hubble Space Telescope
Peterson, B. M.; Koratkar, A. P.; Korista, K. T. +1 more
The Faint Object Spectrograph on the Hubble Space Telescope (HST) was used to obtain spectrophotometric observations of the Seyfert 1 galaxy NGC 7469. The spectra were obtained with a 90 s time resolution in order to resolve the fastest expected variability and to search for rapid characteristic timescales (e.g., quasi-periodic oscillations or bre…
Space Telescope Imaging Spectrograph Near-Ultraviolet Time-tagged Spectra of the Crab Pulsar
Gull, Theodore R.; Lundqvist, Peter; Sonneborn, George +8 more
We present the spectrum and the pulse profile of the Crab Pulsar in the near-ultraviolet (1600-3200 Å) observed with the Space Telescope Imaging Spectrograph (STIS) during the Hubble Space Telescope (HST) second Servicing Mission Orbital Verification (SMOV) period. The two-dimensional near-ultraviolet Multianode Microchannel Array (NUV MAMA) was u…
The Probable Optical Counterpart of the Luminous X-Ray Source in NGC 6441
Anderson, Scott F.; Margon, Bruce; Deutsch, Eric W. +1 more
We report results from Hubble Space Telescope (HST)WFPC2 imaging of the field of the luminous, bursting X-ray source in the globular cluster NGC 6441. Although the X-ray position is known to a precision of a few arcseconds, this source is only ~6" from the cluster center, and the field contains hundreds of stars within the 3" X-ray error circle, m…
Ultraviolet Coronagraph Spectrometer Observations of Density Fluctuations in the Solar Wind
Romoli, M.; Poletto, G.; Noci, G. +2 more
In the Letter ``Ultraviolet Coronagraph Spectrometer Observations of Density Fluctuations in the Solar Wind'' by L. Ofman, M. Romoli, G. Poletto, G. Noci, and J. L. Kohl (ApJ, 491, L111 [1997]), there was an error in the data reduction of the polarized brightness (pB). It was assumed that the cadence of the da…