Search Publications
Hubble Space Telescope Images of the Nuclear Star-forming Region in the Interacting Galaxy NGC 5930
Bower, Gary A.; Wilson, Andrew S.
High-resolution images of the spiral galaxy NGC 5930 have been obtained with the Planetary Camera aboard the Hubble Space Telescope in the emission lines of [O III] λλ4959, 5007 + Hβ and Hα + [N II] λλ6548, 6583, and their adjacent continua. NGC 5930 is the interacting companion of the Type 2 Seyfert galaxy NGC 5929. Five bright continuum knots, w…
Far-Ultraviolet Stellar Photometry: Fields in Sagittarius and Scorpius
Schmidt, Edward G.; Carruthers, George R.
Far-ultraviolet photometry for 741 objects in a field in Sagittarius centered near M8 and 541 objects in a field centered near sigma Scorpii is presented. These data were extracted from electographic images obtained with two cameras during a shuttle flight in 1991 April/May. The cameras provided band passes with lambdaeff = 1375 A and l…
The X-Ray Spectra of Blazars: Analysis of the Complete EXOSAT Archive: Erratum
Giommi, Paolo; Barr, Paul; Sambruna, Rita M. +3 more
In the paper "The X-Ray Spectra of Blazars: Analysis of the Complete EXOSAT Archive" by Rita M. Sambruna, Paul Barr, Paolo Giommi, Laura Maraschi, Gianpiero Tagliaferri, and Aldo Treves (ApJS, 95,371 [1994]), the section regarding the object PKS 1510-08 (Section 4.4.14) contains an erroneous quotation. K. P. Singh, A.R. Rao, and M.N. Vahia (ApJ, 3…
Atlas of Quasar Energy Distributions
Elvis, Martin; Wilkes, Belinda J.; McDowell, Jonathan C. +6 more
We present an atlas of the spectral energy distributions (SEDs) of normal, nonblazar, quasars over the whole available range (radio to 10 keV X-rays) of the electromagnetic spectrum. The primary (UVSX) sample includes 47 quasars for which the spectral energy distributions include X-ray spectral indices and UV data. Of these, 29 are radio quiet, an…
An IUE Survey of Interstellar H i LY alpha Absorption. I. Column Densities
Savage, Blair D.; Diplas, Athanassios
We measure Galactic interstellar neutral hydrogen column densities by analyzing archival interstellar Ly alpha absorption line data toward 554 B2 and hotter stars observed at high resolution with the IUE satellite. This study more than doubles the number of lines of sight with measures of N(H I) based on Ly alpha. We have included the scattered li…
A Compilation of Electronic Transitions in the CO Molecule and the Interpretation of Some Puzzling Interstellar Absorption Features
Morton, Donald C.; Noreau, Louis
This compilation lists wavenumbers, wavelengths, and oscillator strengths for 1589 electronic transitions of (12)C(16)O, (13)C(16)O, (12)C(18)O, and (13)C(18)O between 1000 and 1545 A. These are the transitions from J double prime = 0 to 6 and v double prime = 0 of the ground term which are most likely to appear as interstellar absorption lines in…
Density Contrast Shell Models for the Planetary Nebula IC 2165
Hyung, S.
Since planetary nebulae are spatially extended sources, measurements of individual line fluxes may pertain to different areas of their images. Photoelectric or infrared observations of the strongest lines may embrace the entire image; International Ultraviolet Explorer (IUE) observations involve an elliptical aperture, 10 sec x 23 sec; while a spe…
The X-Ray Spectra of Blazars: Analysis of the Complete EXOSAT Archive
Giommi, Paolo; Barr, Paul; Sambruna, Rita M. +3 more
We analyzed the 0.1-10 keV spectra of 26 blazars (21 BL Lac objects and 5 highly polarized quasars), on the basis of 93 exposures taken from the EXOSAT archives. Fits were performed first with a single power-law model. Indications are found that better fits can be obtained with models where the slope steepens at higher energies. We therefore consi…
An Atlas of Ultraviolet P Cygni Profiles
Snow, Theodore P.; Lamers, Henny J. G. L. M.; Lindholm, Douglas M. +1 more
We have selected spectra of 232 stars from the International Ultraviolet Explorer (IUE) archives for inclusion in an atlas intended for various uses but tailored especially for the study of stellar winds. The atlas covers the range in spectral types from O3 to F8. The full atlas covers the reduced and normalized high resolution spectra from the IU…
High-Energy Spectra of Active Galactic Nuclei. I. The Catalog
Malaguti, G.; Bassani, L.; Caroli, E.
This paper presents a catalog of high-energy spectra (E >= 0.01 keV) of active galactic nuclei (AGNs). The catalog contains 209 objects (140 Seyfert galaxies, 65 quasars, and 4 objects otherwise classified), for a total of 1030 spectra. Most of the data have been collected from the literature over a period spanning more than 20 yr starting from…