Science Archives Publication System

HST STIS Observations of PG 0946+301: The Highest Quality UV Spectrum of a BALQSO

DOI: 10.1086/323369 Bibcode: 2001ApJ...561..118A

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…

2001 • The Astrophysical Journal

eHST 115

An auroral flare at Jupiter

DOI: 10.1038/35071018 Bibcode: 2001Natur.410..787W

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…

2001 • Nature

eHST 114

The Giant Flare of 1998 August 27 from SGR 1900+14. I. An Interpretive Study of BeppoSAX and Ulysses Observations

DOI: 10.1086/319441 Bibcode: 2001ApJ...549.1021F

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…

2001 • The Astrophysical Journal

Ulysses 114

Stellar encounters with the solar system

DOI: 10.1051/0004-6361:20011330 Bibcode: 2001A&A...379..634G

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…

2001 • Astronomy and Astrophysics

Hipparcos 113

HST/WFPC2 imaging of the QDOT ultraluminous infrared galaxy sample

DOI: 10.1111/j.1365-2966.2001.04721.x Bibcode: 2001MNRAS.326.1333F

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…

2001 • Monthly Notices of the Royal Astronomical Society

eHST 113

On the Origin of Infrared Plateau Features in Proto-Planetary Nebulae

DOI: 10.1086/320913 Bibcode: 2001ApJ...554L..87K

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…

2001 • The Astrophysical Journal

ISO 113

XMM-Newton observation of the Tycho supernova remnant

DOI: 10.1051/0004-6361:20000115 Bibcode: 2001A&A...365L.218D

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…

2001 • Astronomy and Astrophysics

XMM-Newton 112

Ultraviolet Line Spectra of Metal-poor Star-forming Galaxies

DOI: 10.1086/319814 Bibcode: 2001ApJ...550..724L

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 Z_sol…

2001 • The Astrophysical Journal

eHST 112

Observational Estimates for the Mass-Loss Rates of α Centauri and Proxima Centauri Using Hubble Space Telescope Lyα Spectra

DOI: 10.1086/318888 Bibcode: 2001ApJ...547L..49W

Zank, Gary P.; Wood, Brian E.; Linsky, Jeffrey L. +1 more

We study H I Lyα absorption observed by the Hubble Space Telescope toward the nearby binary system α Centauri (G2 V + K0 V) and its distant companion star Proxima Centauri (M5.5 Ve). Absorption from heliospheric H I heated by the solar wind/interstellar medium interaction is observed toward both α Cen and Proxima Cen. Absorption from analogous ``a…

2001 • The Astrophysical Journal

eHST 112

Methylpolyynes and Small Hydrocarbons in CRL 618

DOI: 10.1086/318872 Bibcode: 2001ApJ...546L.127C

Waters, L. B. F. M.; Cernicharo, José; Tielens, A. G. G. M. +5 more

We report on the detection with the Infrared Space Observatory of strong infrared absorption from NH₃ and C₂H₄ in CRL 618. The observed NH₃ and C₂H₄ bands arise from a region with kinetic temperatures ~=200 K, i.e., the dense gas in the photodissociation region associated to the den…

2001 • The Astrophysical Journal

ISO 112