Search Publications
Final Results from the Hubble Space Telescope Key Project to Measure the Hubble Constant
Kelson, Daniel D.; Illingworth, Garth D.; Huchra, John P. +12 more
We present here the final results of the Hubble Space Telescope (HST) Key Project to measure the Hubble constant. We summarize our method, the results, and the uncertainties, tabulate our revised distances, and give the implications of these results for cosmology. Our results are based on a Cepheid calibration of several secondary distance methods…
The Farthest Known Supernova: Support for an Accelerating Universe and a Glimpse of the Epoch of Deceleration
Dickinson, Mark; Casertano, Stefano; Filippenko, Alexei V. +16 more
We present photometric observations of an apparent Type Ia supernova (SN Ia) at a redshift of ~1.7, the farthest SN observed to date. The supernova, SN 1997ff, was discovered in a repeat observation by the Hubble Space Telescope (HST) of the Hubble Deep Field-North (HDF-N) and serendipitously monitored with NICMOS on HST throughout the Thompson et…
The Rest-Frame Optical Spectra of Lyman Break Galaxies: Star Formation, Extinction, Abundances, and Kinematics
Dickinson, Mark; Giavalisco, Mauro; Pettini, Max +5 more
We present the first results of a spectroscopic survey of Lyman break galaxies (LBGs) in the near-infrared aimed at detecting the emission lines of [O II], [O III], and Hβ from the H II regions of normal star-forming galaxies at z~=3. From observations of 15 objects with the Keck telescope and the Very Large Telescope augmented with data from the …
The Stellar Populations and Evolution of Lyman Break Galaxies
Papovich, Casey; Dickinson, Mark; Ferguson, Henry C.
Using deep near-infrared and optical observations of the Hubble Deep Field-North from the Hubble Space Telescope NICMOS and WFPC2 instruments and from the ground, we examine the spectral energy distributions (SEDs) of Lyman break galaxies (LBGs) at 2.0<~z<~3.5 in order to investigate their stellar population properties. The ultraviolet-optic…
Hubble Space Telescope Time-Series Photometry of the Transiting Planet of HD 209458
Burrows, Adam; Gilliland, Ronald L.; Charbonneau, David +2 more
We have observed four transits of the planet of HD 209458 using the STIS spectrograph on the Hubble Space Telescope (HST). Summing the recorded counts over wavelength between 582 and 638 nm yields a photometric time series with 80 s time sampling and relative precision of about 1.1×10-4 per sample. The folded light curve can be fitted w…
Observational Constraints on the Formation and Evolution of Binary Stars
Ghez, A. M.; White, R. J.
We present a high spatial resolution multiwavelength survey of 44 young binary star systems in Taurus-Auriga with separations of 10-1000 AU. These observations, which were obtained using the Hubble Space Telescope and the NASA Infrared Telescope Facility, quadruple the number of close (less than 100 AU) binary stars with spatially resolved measure…
The Metamorphosis of SN 1998bw
Leibundgut, Bruno; Kouveliotou, Chryssa; Nomoto, Ken'ichi +23 more
We present and discuss the photometric and spectroscopic evolution of the peculiar SN 1998bw, associated with GRB 980425, through an analysis of optical and near-IR data collected at ESO-La Silla. The spectroscopic data, spanning the period from day -9 to day +376 (relative to B maximum), have shown that this supernova (SN) was unprecedented, alth…
Quasi-Stellar Objects, Ultraluminous Infrared Galaxies, and Mergers
Stockton, Alan; Canalizo, Gabriela
We test the hypothesis that QSOs are formed via strong tidal interactions or mergers, initially going through an ultraluminous infrared phase. Our approach is to look for traces of this phase in the host galaxies of QSOs. We select a sample of low-redshift bona fide QSOs that may be in a transitionary stage between ultraluminous infrared galaxies …
On the Nature of the Central Source in η Carinae
Davidson, K.; Hillier, D. John; Gull, T. +1 more
Long-slit spectroscopic observations of η Carinae and its Homunculus have recently been obtained using STIS on the Hubble Space Telescope (HST). We have extracted the spectrum of the central source using a 0.1"×0.13" aperture. As expected, the spectrum is very different from ground-based spectra obtained under normal seeing conditions (i.e., 1")-t…
A Correlation between Galaxy Light Concentration and Supermassive Black Hole Mass
Graham, Alister W.; Trujillo, I.; Erwin, Peter +1 more
We present evidence for a strong correlation between the concentration of bulges and the mass of their central supermassive black hole (Mbh)-more concentrated bulges have more massive black holes. Using Cre(1/3) from Trujillo, Graham, & Caon as a measure of bulge concentration, we find that log(Mbh/M…