Search Publications
Crystalline water ice in OH32.8-0.3
Maldoni, M. M.; Robinson, G.; Wright, C. M. +2 more
The 2.2-200 µm spectrum of OH32.8-0.3 has been modelled. Mie theory and radiative transfer models of the 3-µm band of H2O ice are consistent with a strongly crystalline structural phase. This is also confirmed by the presence of a 44/62-µm band complex analogous to that of laboratory crystalline H2O ice anal…
CTQ 327: A New Gravitational Lens
Becker, R.; Wisotzki, L.; Gregg, M. D. +4 more
We present the second gravitationally lensed quasar discovered during the course of a Hubble Space Telescope Space Telescope Imaging Spectrograph snapshot survey for small-separation gravitational lenses. CTQ 327 is a double quasar with an image separation of 1.22" and a g-band flux ratio of roughly 5 to 1. Spectra reveal both components to be z=1…
On the solar origin of interplanetary disturbances observed in the vicinity of the Earth
Schwenn, R.; Pick, M.; Vilmer, N. +2 more
The solar origin of 40 interplanetary disturbances observed in the vicinity of the Earth between January 1997 and June 1998 is investigated in this paper. Analysis starts with the establishment of a list of Interplanetary Mass Ejections or ICMEs (magnetic clouds, flux ropes and ejecta) and of Interplanetary Shocks measured at WIND for the period f…
Transneptunian Binaries
Noll, Keith S.
The discovery of binaries among the population of transneptunian objects isa landmark advance in the study of this remote region of the solar system.Determination of binary orbits will enable direct determination of systemmasses, fundamental for determination of density, internal structure, and bulkcomposition. The mere existence of binaries with …
The Star Formation Histories of Four Fields Spanning the Minor Axis of NGC 6822
Wyder, Ted K.
The star formation histories of four fields within the Local Group dwarf irregular galaxy NGC 6822 are presented. Each of the fields was imaged by the WFPC2 aboard the Hubble Space Telescope and were used to obtain VI color-magnitude diagrams for each field reaching V~=26. The magnitude of the tip of the red giant branch and the red clump were use…
A far-infrared view of the Lockman Hole from ISO 95-µm observations - I. A new data reduction method
Rodighiero, G.; Franceschini, A.; Lari, C. +2 more
We report results from a new analysis of a deep 95-µm imaging survey with the photopolarimeter ISOPHOT on-board the Infrared Space Observatory, over a 40 × 40 arcmin2 area within the Lockman Hole. To this end we exploit a newly developed parametric algorithm able to identify and clean spurious signals induced by cosmic rays impact…
Flare-Induced Excitation of Solar p modes
Basu, Sarbani; Antia, H. M.; Ambastha, Ashok
Solar flares release large amounts of energy at different layers of the solar atmosphere, including at the photosphere in the case of exceptionally major events. Therefore, it is expected that large flares would be able to excite acoustic waves on the solar surface, thereby affecting the p-mode oscillation characteristics. We have applied the ring…
An Atlas of Hubble Space Telescope Spectra and Images of Nearby Spiral Galaxies
Marconi, A.; Capetti, A.; Carollo, C. M. +17 more
We have observed 54 nearby spiral galaxies with the Space Telescope Imaging Spectrograph (STIS) on the Hubble Space Telescope to obtain optical long-slit spectra of nuclear gas disks and STIS optical (~R band) images of the central 5''×5'' of the galaxies. These spectra are being used to determine the velocity field of nuclea…
HST observations of the metal rich globular clusters NGC 6496 and NGC 6352
Covino, S.; Pulone, L.; Paresce, F. +1 more
Deep exposures of the metal-rich globular clusters NGC 6496 and NGC 6352 were obtained with the WFPC2 camera on board the Hubble Space Telescope (HST) through the F606W and F814W filters. The resulting colour-magnitude diagrams (CMD) reach down to absolute magnitude M814 =~ 10-10.5, approximately 5 magnitudes below the main sequence (MS…
The source content of low galactic latitude XMM-Newton surveys
Motch, C.; Guillout, P.; Herent, O.
We present results from a project conducted by the Survey Science Center of the XMM-Newton satellite and aiming at the identification and characterisation of serendipitous EPIC sources at low galactic latitudes. Deep multi-colour optical imaging and spectroscopic observations have been obtained in the framework of several observing campaigns carri…