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283 papers · 1 filter
A Deep, Wide Field, Optical, and Near Infrared Catalog of a Large Area around the Hubble Deep Field North
P. Capak, L. L. Cowie, E. M. Hu +10
We have conducted a deep multi-color imaging survey of 0.2 degrees^2 centered on the Hubble Deep Field North (HDF-N). We shall refer to this region as the Hawaii-HDF-N. Deep data w…
A Study of the Reionization History of Intergalactic Helium with FUSE and VLT
W. Zheng, G. A. Kriss, J. -M. Deharveng +8
We obtained high-resolution VLT and FUSE spectra of the quasar HE2347-4342 to study the properties of the intergalactic medium between redshifts z=2.0-2.9. The high-quality optical…
ACS Observations of a Strongly Lensed Arc in a Field Elliptical
J. P. Blakeslee, K. C. Zekser, N. Benitez +15
We report the discovery of a strongly lensed arc system around a field elliptical galaxy in Hubble Space Telescope (HST) Advanced Camera for Surveys (ACS) images of a parallel fiel…
WFI J2026-4536 and WFI J2033-4723: Two New Quadruple Gravitational Lenses
Nicholas D. Morgan, John A. R. Caldwell, Paul L. Schechter +3
We report the discovery of two new gravitationally lensed quasars, WFI J2026-4536 and WFI J2033-4723, at respective source redshifts of z=2.23 and z=1.66. Both systems are quadrupl…
Indications of a Large Fraction of Spectroscopic Binaries Among Nuclei of Planetary Nebulae
Orsola De Marco, Howard E. Bond, Dianne Harmer +1
Previous work indicates that about 10% of planetary-nebula nuclei (PNNi) are photometrically variable short-period binaries with periods of hours to a few days. These systems have…
The Ionized Gas in Local Starburst Galaxies: Global and Small--Scale Feedback from Star Formation
Daniela Calzetti, Jason Harris, John S. Gallagher +4
Abridged: The small-- and intermediate--scale structure and the fraction of the ISM ionized by non--radiative processes is investigated in a small sample of four local starburst ga…