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Hubble Space Telescope Observations of Nine High-Redshift ESSENCE Supernovae1,
Filippenko, Alexei V.; Wood-Vasey, W. Michael; Foley, Ryan J. +29 more
We present broadband light curves of nine supernovae ranging in redshift from 0.5 to 0.8. The supernovae were discovered as part of the ESSENCE project, and the light curves are a combination of Cerro Tololo 4 m and Hubble Space Telescope (HST) photometry. On the basis of spectra and/or light-curve fitting, eight of these objects are definitely Ty…
Deep Impact: Working Properties for the Target Nucleus Comet 9P/Tempel 1
Fernández, Yanga R.; A'Hearn, Michael F.; Pittichová, Jana +13 more
In 1998, Comet 9P/Tempel 1 was chosen as the target of the Deep Impact mission (A’Hearn, M. F., Belton, M. J. S., and Delamere, A., Space Sci. Rev., 2005) even though very little was known about its physical properties. Efforts were immediately begun to improve this situation by the Deep Impact Science Team leading to the founding of a worldwide o…
Absolute Proper Motion of the Sagittarius Dwarf Galaxy and of the Outer Regions of the Milky Way Bulge
Girard, Terrence M.; van Altena, William F.; López, Carlos E. +1 more
We have determined the absolute proper motion of the Sagittarius dwarf spheroidal galaxy (Sgr) from the Southern Proper Motion Catalog 3, by selecting red giant candidates from the Two Micron All Sky Survey. We obtain µlcosb=-2.35+/-0.20 and µb=2.07+/-0.20 mas yr-1. Using the same procedure, we also det…
An optical time delay for the double gravitational lens system FBQ 0951+2635
Lidman, C.; Hjorth, J.; Jakobsson, P. +3 more
We present optical R-band light curves of the double gravitationally lensed quasar FBQ 0951+2635 from observations obtained at the Nordic Optical Telescope between March 1999 and June 2001. A time delay of Δ τ = 16 ± 2 days (1σ) is determined from the light curves. New constraints on the lensing geometry are provided by the position and ellipticit…
Highly Ionized Gas in the Galactic Halo and the High-Velocity Clouds toward PG 1116+215
Tripp, Todd M.; Sembach, Kenneth R.; Savage, Blair D. +1 more
We have obtained high-resolution Far Ultraviolet Spectroscopic Explorer (FUSE) and Hubble Space Telescope (HST) Space Telescope Imaging Spectrograph (STIS) echelle observations of the quasar PG 1116+215 (zem=0.1765, l=223.36d, b=+68.21d). The semicontinuous coverage of the ultraviolet spectrum over the wavelength range 916-2800 Å provid…
Obscured Activity: AGN, Quasars, Starbursts and ULIGs Observed by the Infrared Space Observatory
Haas, Martin; Klaas, Ulrich; Lutz, Dieter +2 more
Some of the most ‘active’ galaxies in the Universe are obscured by large quantities of dust and emit a substantial fraction of their bolometric luminosity in the infrared. Observations of these infrared luminous galaxies with the Infrared Space Observatory (ISO) have provided a relatively unabsorbed view to the sources fuelling this active emissio…
Water in Space: The Water World of ISO
Cernicharo, José; Crovisier, Jacques
In this review we present the main results obtained by the ISO satellite on the abundance and spatial distribution of water vapor in the direction of molecular clouds, evolved stars, galaxies, and in the bodies of our Solar System. We also discuss the modeling of H2O and the difficulties found in the interpretation of the data, the need…
Catastrophic Cooling of Impulsively Heated Coronal Loops
Erdélyi, Robert; Mendoza-Briceño, César A.; Sigalotti, Leonardo Di G.
The physical mechanisms that cause the heating of the solar corona are still far from being completely understood. However, recent highly resolved observations with the current solar missions have shown clear evidence of frequent and very localized heating events near the chromosphere that may be responsible for the observable high temperatures of…
Stellar Cluster Fiducial Sequences with the Advanced Camera for Surveys
Ferguson, Henry C.; Brown, Thomas M.; Rich, R. Michael +6 more
We present color-magnitude diagrams of five Galactic globular clusters and one Galactic open cluster spanning a wide range of metallicity (-2.1<~[Fe/H]<~+0.3), as observed in the F606W (broad V) and F814W (I) bands with the Advanced Camera for Surveys (ACS) on the Hubble Space Telescope. These clusters are part of two large ACS programs meas…
Uranus in 2003: Zonal winds, banded structure, and discrete features
Hammel, H. B.; de Pater, I.; Gibbard, S. +2 more
Imaging of Uranus in 2003 with the Keck 10-m telescope reveals banded zonal structure and dozens of discrete cloud features at J and H bands; several features in the northern hemisphere are also detectable at K'. By tracking features over four days, we extend the zonal wind profile well into the northern hemisphere. We report the first measurement…