Search Publications
The Dust-Radio Connection in 3CR Radio Galaxies
Baum, Stefi A.; Miley, George; Sparks, William +6 more
We investigate dust in the nuclear regions of radio galaxies on the basis of 120 images of 3CR radio galaxies in the redshift range 0<z<0.5, taken with the WFPC-2 on the Hubble Space Telescope. At least 40 of these radio galaxies show evidence for absorption due to clumpy dust features; a large range of morphologies is observed for these dus…
An IUE Atlas of Pre-Main-Sequence Stars. I. Co-added Final Archive Spectra from the SWP Camera
Valenti, Jeff A.; Johns-Krull, Christopher M.; Linsky, Jeffrey L.
We have identified 50 T Tauri stars (TTS) and 74 Herbig Ae/Be (HAEBE) stars observed in the IUE short-wavelength bandpass (1150-1980 Å). Each low-resolution (R~6 Å) spectrum was visually inspected for source contamination and data quality, and then all good spectra were combined to form a single time-averaged spectrum for each star. Use of IUE Fin…
Hubble Space Telescope WFPC2 Imaging of a Sample of Early-Type Seyfert Galaxies
Ferruit, Pierre; Mulchaey, John; Wilson, Andrew S.
We have defined a complete sample comprising all 14 Seyfert galaxies in early-type (E, S0, Sa) host galaxies with apparent magnitude mv<14.5 mag and recessional velocity cz<3000 km s-1. This paper presents Hubble Space Telescope (HST) imaging observations of 12 of them, the other two having been observed previously with…
Caltech Faint Galaxy Redshift Survey. IX. Source Detection and Photometry in the Hubble Deep Field Region
Steidel, Charles C.; Hogg, David W.; Neugebauer, Gerry +6 more
Detection and photometry of sources in the Un, G, \Rscr, and Ks bands in a 9×9 arcmin2 region of the sky, centered on the Hubble Deep Field, are described. The data permit construction of complete photometric catalogs to roughly Un=25, G=26, \Rscr=25.5, Ks=20 mag and significant photometric me…
The Local Lyα Forest. I. Observations with the GHRS/G160M on the Hubble Space Telescope
Shull, J. Michael; Stocke, John T.; Penton, Steven V.
We present the target selection, observations, and data reduction and analysis process for a program aimed at discovering numerous, weak (equivalent width <=100 mÅ) Lyα absorption lines in the local universe (0.003<=z<=0.069). The purpose of this program is to study the physical conditions of the local intergalactic medium, including abso…
A Recalibration of IUE NEWSIPS Low-Dispersion Data
Fitzpatrick, E. L.; Massa, D.
While the low-dispersion IUE New Spectroscopic Image Processing System (NEWSIPS) data products represent a significant improvement over original IUE Spectroscopic Image Processing System (SIPS) data, they still contain serious systematic effects which compromise their utility for certain applications. We show that NEWSIPS low-resolution data are i…
A NICMOS Survey of Early-Type Galaxy Centers: The Relation Between Core Properties, Gas and Dust Content, and Environment
Bower, Gary A.; Quillen, A. C.; Stritzinger, M.
We present a NICMOS 1.6 µm imaging isophotal study of 27 early-type galaxies. Core galaxies have reduced ellipticity and boxiness near and within their core or break radius. This supports a core formation mechanism that mixes or scatters stars such as scattering caused by a binary black hole. We find the same trends between central surface b…
The Hubble Space Telescope Quasar Absorption Line Key Project. XV. Milky Way Absorption Lines
Schneider, Donald P.; Savage, Blair D.; Sargent, W. L. W. +10 more
This paper presents the results of an analysis of the Milky Way absorption lines found in the Hubble Space Telescope (HST) Quasar Absorption Line Key Project database for 83 QSOs observed with the Faint Object Spectrograph G190H and G270H gratings, of which 16 QSOs are also observed with the G130H grating. The HST Key Project observations are supp…
The Narrow-Line Region in the Seyfert 2 Galaxy NGC 3393
Ferland, G. J.; Wilson, Andrew S.; Netzer, Hagai +2 more
The narrow-line region (NLR) of the Seyfert 2 galaxy NGC 3393 is dominated by a symmetric structure which appears as S-shaped arms in Hubble Space Telescope (HST) images. These arms, which occupy the central few arcseconds of the nucleus, border a linear, triple-lobed radio source. We use HST imaging and spectra, ground-based optical images, long-…
Magellanic Cloud-Type Interstellar Dust along Low-Density Sight Lines in the Galaxy
Gordon, Karl D.; Clayton, Geoffrey C.; Wolff, Michael J.
We have studied the UV extinction properties along 30 Galactic sight lines using data from the International Ultraviolet Explorer archive that have never been previously examined. These distant (d>1 kpc) sight lines were selected to investigate the distribution and physical conditions of gas located in low-density regions of the Galactic disk a…