Search Publications
Template Ultraviolet to Near-Infrared Spectra of Star-forming Galaxies and Their Application to K-Corrections
Calzetti, Daniela; Storchi-Bergmann, Thaisa; Bohlin, Ralph C. +3 more
Template UV-optical spectra of quiescent and starburst galaxies are presented and used to derive K-corrections as a function of morphological type and redshift. IUE observations and archival data are used for the UV template spectra. The optical spectra are from ground-based observations obtained in apertures that match closely the 200 arcsec^2^ I…
Hubble Space Telescope Observations of the Lensing Cluster Abell 2218
Smail, I.; Kneib, J. -P.; Ellis, R. S. +2 more
We present a striking new Hubble Space Telescope (HST) observation of the rich cluster Abell 2218 taken with the Wide Field Planetary Camera 2. HST's restored image quality reveals a sizable number of gravitationally lensed features in this cluster, significantly more than bad been identified by using ground-based telescopes. The brightest arcs ar…
Hubble Space Telescope Observations of the Disk and Jet of HH 30
Ballester, Gilda E.; Krist, John E.; Crisp, David +13 more
HH 30 in Taurus has been imaged with the Hubble Space Telescope WFPC2. The images show in reflected light a flared disk with a radius of about 250 AU that obscures the protostar. The disk resembles detailed accretion disk models that constrain its density distribution and show that its inclination is less than 100. There are bipolar emission-line …
The Abundance of Interstellar Carbon
Savage, Blair D.; Meyer, David M.; Jura, M. +1 more
We present an analysis of the abundance of interstellar carbon toward six stars within 600 pc of the Sun based upon high signal-to-noise (S/N ≃ 400-600) data of the weak intersystem line C II] λ2325 Å obtained with the Goddard High Resolution Spectrograph aboard the Hubble Space Telescope. We find that the measured gas-phase C/H shows no dependenc…
Hubble Space Telescope Imaging of Star-forming Galaxies at Redshifts Z > 3
Giavalisco, Mauro; Steidel, Charles C.; Macchetto, F. Duccio
We present Hubble Space Telescope images of star-forming galaxies at redshifts z > 3. These galaxies have been selected using ground-based images and color criteria sensitive to the presence of a Lyman discontinuity in the otherwise flat (in fnu_ units) UV spectral energy distribution of unreddened star formation. The spectroscopic c…
Evidence for a Massive Black Hole in the Active Galaxy NGC 4261 from Hubble Space Telescope Images and Spectra
Ferrarese, Laura; Ford, Holland C.; Jaffe, Walter
We present HST/WFPC2 V, R, and I images and Hubble Space Telescope/FOS spectra of the active galaxy NGC 4261. The galaxy hosts a nuclear disk of dust (see papers by Jaffe et al.), roughly perpendicular to the radio jet. The images presented here show evidence of a spiral-like structure in the disk that likely provides the means by which angular mo…
The α Centauri line of sight: D/H ratio, physical properties of local interstellar gas, and measurement of heated hydrogen (the "hydrogen wall") near the heliopause.
Wood, Brian E.; Linsky, Jeffrey L.
The authors analyze high resolution spectra of the nearby (1.34 pc) stars α Cen A (G2 V) and α Cen B (K1 V), which were obtained with the GHRS on the HST. The observations consist of echelle spectra of the Mg II 2800 Å and Fe II 2599 Å resonance lines and the Lyman-α lines of hydrogen and deuterium. The interstellar gas has a velocity of v = -18.0…
Optical Rotation Curves of Distant Field Galaxies: Keck Results at Reshifts to Z approximately 1
Illingworth, Garth D.; Forbes, Duncan A.; Faber, S. M. +4 more
Spatially resolved velocity profiles are presented for nine faint field galaxies in the redshift range 0.1 <~ z <~ 1, based on moderate-resolution spectroscopy obtained with the Keck 10 m telescope. These data were augmented with high-resolution Hubble Space Telescope images from WFPC2, which provided V and I photometry, galaxy type, orienta…
Triaxial Galaxies with Cusps
Merritt, David; Fridman, Tema
We have constructed fully self-consistent models of triaxial galaxies with central density cusps. The triaxial generalizations of Dehnen's spherical mass models are presented, which have densities that vary as r^-γ^ near the center and r^-4^ at large radii. We computed libraries of ~7000 orbits in each of two triaxial models with γ = 1 ("weak cusp…
The Extragalactic Distance Scale Key Project. IV. The Discovery of Cepheids and a New Distance to M100 Using the Hubble Space Telescope
Illingworth, Garth D.; Madore, Barry F.; Freedman, Wendy L. +19 more
We report on observations of Cepheids in the Virgo spiral galaxy M100, based on data obtained with the Wide Field and Planetary Camera 2 (WFPC2) on board the Hubble Space Telescope (HST). The observations are part of the HST Key Project on the Extragalactic Distance Scale, which aims to provide a measurement of the Hubble constant H_0_ with 10% ac…