7.7k citations
- Goddard Space Flight CenterUS398 papers
- California Institute of TechnologyUS214 papers
- University of Hawaii SystemUS143 papers
- Ames Research CenterUS142 papers
- Centre National de la Recherche ScientifiqueFR112 papers
- Jet Propulsion LaboratoryUS110 papers
- Space Telescope Science InstituteUS108 papers
- University of Maryland, College ParkUS107 papers
- University of ArizonaUS100 papers
- Massachusetts Institute of TechnologyUS93 papers
- Marshall Space Flight CenterUS91 papers
- Pennsylvania State UniversityUS89 papers
20 papers · 1 filter
The Identification of EGRET Sources with Flat-Spectrum Radio Sources
J. R. Mattox, J. Schachter, L. Molnar +2
We present a method to assess the reliability of the identification of EGRET sources with extragalactic radio sources. We verify that EGRET is detecting the blazar class of AGN. Ho…
Combined stellar structure and atmosphere models for massive stars. III. Spectral evolution and revised ionising fluxes of O3-B0 stars
Daniel Schaerer, Alex de Koter
We provide an extensive set of theoretical spectral energy distributions of massive stars derived from our "combined stellar structure and atmosphere models". The calculations cove…
An ISOPHOT of the disk of galaxy NGC 6946: 60 micron infrared and radio continuum correlation
N. Y. Lu, G. Helou, R. Tuffs +4
We use the ISOPHOT 60 micron image of Tuffs et al. (1996) to study the 60 micron light distribution and its correlation with radio continuum within the disk of spiral galaxy NGC694…
The Mid-Infrared Color of NGC 6946
G. Helou, S. Malhotra, C. A. Beichman +10
We analyze the new mid-infrared maps of NGC 6946 for variations in the color ratio of the 7-to-15 micron emission. Our preliminary findings are that this mid-infrared color is rema…
ISOCAM Observations of NGC 6946: Mid-IR Structure
S. Malhotra, G. Helou, D. van Buren +12
The nearby spiral galaxy NGC 6946 was observed with ISO-CAM in the mid-infrared, achieving 7 arcsec resolution and sub-MJy/steradian sensitivity. Images taken with CAM filters LW2…
A Stochastic Approach to Chemical Evolution
Craig J. Copi
Observations of elemental abundances in the Galaxy have repeatedly shown an intrinsic scatter as a function of time and metallicity. The standard approach to chemical evolution doe…