Search Publications
HST/NICMOS2 coronagraphic observations of the circumstellar environment of three old PMS stars: HD 100546, SAO 206462 and MWC 480
Ménard, F.; Mouillet, D.; Augereau, J. C. +1 more
The close environment of four old Pre-Main Sequence stars has been observed thanks to the coronagraphic mode of the HST/NICMOS2 camera at lambda =1.6 mu m. In the course of this program, a circumstellar annulus around HD 141569 was detected and has already been presented in Augereau et al. (\cite{aug99b}b). In this paper, we report the detection o…
FIRBACK: III. Catalog, source counts, and cosmological implications of the 170 mu m ISO
Elbaz, D.; Cesarsky, C.; Bouchet, F. R. +17 more
The FIRBACK (Far Infrared BACKground) survey is one of the deepest imaging surveys carried out at 170 mu m with ISOPHOT onboard ISO, and is aimed at the study of the structure of the Cosmic Far Infrared Background. This paper provides the analysis of resolved sources. After a validated process of data reduction and calibration, we perform intensiv…
HST STIS Observations of PG 0946+301: The Highest Quality UV Spectrum of a BALQSO
Pettini, Max; Brandt, W. N.; Laor, Ari +16 more
We describe deep (40 orbits) Hubble Space Telescope (HST) Space Telescope Imaging Spectrograph observations of the broad absorption line (BAL) quasi-stellar object (QSO) PG 0946+301 and make them available to the community. These observations are the major part of a multiwavelength campaign on this object aimed at determining the ionization equili…
An auroral flare at Jupiter
Desai, S.; McComas, D. J.; Young, D. T. +8 more
Jupiter's aurora is the most powerful in the Solar System. It is powered largely by energy extracted from planetary rotation, although there seems also to be a contribution from the solar wind. This contrasts with Earth's aurora, which is generated through the interaction of the solar wind with the magnetosphere. The major features of Jupiter's au…
The Giant Flare of 1998 August 27 from SGR 1900+14. I. An Interpretive Study of BeppoSAX and Ulysses Observations
Hurley, K.; Feroci, M.; Duncan, R. C. +1 more
The giant flare of 1998 August 27 from SGR 1900+14 was extraordinary in many ways: it was the most intense flux of gamma rays ever detected from a source outside our solar system; it was longer than any previously detected burst from a soft gamma repeater (SGR) in our Galaxy by more than an order of magnitude; and it showed a remarkable four-peake…
Stellar encounters with the solar system
Lestrade, J. -F.; Latham, D. W.; Paredes, J. M. +5 more
We continue our search, based on Hipparcos data, for stars which have encountered or will encounter the solar system (García-Sánchez et al. \cite{Garcia}). Hipparcos parallax and proper motion data are combined with ground-based radial velocity measurements to obtain the trajectories of stars relative to the solar system. We have integrated all tr…
HST/WFPC2 imaging of the QDOT ultraluminous infrared galaxy sample
Farrah, D.; Colina, L.; Serjeant, S. +6 more
We present HST WFPC2 V-band imaging for 23 ultraluminous infrared galaxies (ULIRGs) taken from the QDOT redshift survey. The fraction of sources observed to be interacting is 87 per cent. Most of the merging systems show a number of compact `knots', whose colour and brightness differ substantially from their immediate surroundings. Colour maps for…
On the Origin of Infrared Plateau Features in Proto-Planetary Nebulae
Volk, Kevin; Kwok, Sun; Bernath, Peter
The emission profiles of the 8 and 12 µm plateau features are derived from the Infrared Space Observatory spectra of proto-planetary nebulae. We suggest that these plateau features are primarily the result of alkane and alkene side groups on very large aromatic molecules and small carbonaceous particles. The relationship between the narrow a…
XMM-Newton observation of the Tycho supernova remnant
Audard, M.; Ballet, J.; Decourchelle, A. +6 more
We present the observation of the Tycho supernova remnant obtained with the EPIC and RGS instruments onboard the XMM-Newton satellite. We compare images and azimuthally averaged radial profiles in emission lines from different elements (silicon and iron) and different transition lines of iron (Fe L and Fe K). While the Fe Xvii L line and Si Xiii K…
Ultraviolet Line Spectra of Metal-poor Star-forming Galaxies
Pettini, Max; Robert, Carmelle; Heckman, Timothy M. +3 more
We present synthetic ultraviolet spectra of metal-poor star-forming galaxies that were calculated with the Starburst99 package. A new spectral library was generated from Hubble Space Telescope observations of O stars in the Large and Small Magellanic Clouds. The corresponding mean metallicity of the synthetic spectra is approximately 1/4 Zsol…