Search Publications
The Relationship between Stellar Light Distributions of Galaxies and Their Formation Histories
Conselice, Christopher J.
A major problem in extragalactic astronomy is the inability to distinguish in a robust, physical, and model-independent way how galaxy populations are physically related to each other and to their formation histories. A similar, but distinct, and also long-standing question is whether the structural appearances of galaxies, as seen through their s…
CHIANTI-An Atomic Database for Emission Lines. VI. Proton Rates and Other Improvements
Young, P. R.; Mason, H. E.; Landini, M. +3 more
The CHIANTI atomic database contains atomic energy levels, wavelengths, radiative transition probabilities, and electron excitation data for a large number of ions of astrophysical interest. Version 4 has been released, and proton excitation data are now included, principally for ground configuration levels that are close in energy. The fitting pr…
A Uniform Database of 2.4-45.4 Micron Spectra from the Infrared Space Observatory Short Wavelength Spectrometer
Sloan, G. C.; Kraemer, Kathleen E.; Price, Stephan D. +1 more
We present a complete set of all valid SWS full-scan 2.4-45.4 µm spectra processed and renormalized in as uniform a manner as possible. The processing produces a single spectrum for each observation from the 288 individual spectral segments, which are the most processed form available from the ISO archive. The spectra, and the programs used …
The Far Ultraviolet Spectroscopic Explorer Survey of O VI Absorption in and near the Galaxy
Kruk, J. W.; Savage, B. D.; Wakker, B. P. +18 more
We present Far Ultraviolet Spectroscopic Explorer (FUSE) observations of the O VI λλ1031.926, 1037.617 absorption lines associated with gas in and near the Milky Way, as detected in the spectra of a sample of 100 extragalactic targets and two distant halo stars. We combine data from several FUSE Science Team programs with guest observer data that …
A Hubble Space Telescope Survey of Extended [O III] λ5007 Emission in a Far-Infrared Selected Sample of Seyfert Galaxies: Observations
Hutchings, J. B.; Schmitt, H. R.; Donley, J. L. +2 more
We present a Hubble Space Telescope (HST) survey of extended [O III] emission for a sample of 60 Seyfert galaxies (22 Seyfert 1 galaxies and 38 Seyfert 2 galaxies), selected based on their far-infrared properties. The observations for 42 of these galaxies were done in a snapshot survey with WFPC2. The remaining 18 were obtained from the HST archiv…
Circumnuclear Dust in Nearby Active and Inactive Galaxies. I. Data
Pogge, Richard W.; Mulchaey, John S.; Martini, Paul +1 more
The detailed morphology of the interstellar medium (ISM) in the central kiloparsec of galaxies is controlled by pressure and gravitation. The combination of these forces shapes both circumnuclear star formation and the growth of the central, supermassive black hole. We present visible and near-infrared Hubble Space Telescope images and color maps …
Chandra X-Ray Observations of the Spiral Galaxy M81
Wu, Kinwah; Tennant, Allyn F.; Swartz, Douglas A. +3 more
A Chandra X-Ray Observatory ACIS-S imaging observation is used to study the population of X-ray sources in the nearby Sab galaxy M81 (NGC 3031). A total of 177 sources are detected with 124 located within the D25 isophote to a limiting X-ray luminosity of ~3×1036 ergs s-1. Source positions, count rates, luminositie…
An Imaging Survey of Early-Type Barred Galaxies
Erwin, Peter; Sparke, Linda S.
This paper presents the results of a high-resolution imaging survey, using both ground-based and Hubble Space Telescope images, of a complete sample of nearby barred S0-Sa galaxies in the field, with a particular emphasis on identifying and measuring central structures within the bars: secondary bars, inner disks, nuclear rings and spirals, and of…
The Structure of Stellar Coronae in Active Binary Systems
Sanz-Forcada, J.; Dupree, A. K.; Brickhouse, N. S.
A survey of 28 stars (22 active binary systems, plus six single stars or wide binaries for comparison) using extreme ultraviolet spectra has been conducted to establish the structure of stellar coronae in active binary systems from the emission measure distribution (EMD), electron densities, and scale sizes. Observations obtained by the Extreme Ul…
Target Selection for SETI. I. A Catalog of Nearby Habitable Stellar Systems
Turnbull, Margaret C.; Tarter, Jill C.
In preparation for the advent of the Allen Telescope Array, the SETI Institute has the need to greatly expand its former list of ~2000 targets compiled for Project Phoenix, a search for extraterrestrial technological signals. In this paper we present a catalog of stellar systems that are potentially habitable to complex life forms (including intel…