May 7, 1999 CfA Colloquium

Title: High Resolution Spectroscopy with the Chandra X-ray Observatory

Speaker: Claude Canizares

Abstract: The Chandra X-ray Observatory (CXO), one of NASA's Great Observatories, is scheduled for launch in July 1999. The half-arcsecond angular resolution of the CXO mirrors enable orders of magnitude improvements over previous missions for spectroscopy of galactic and extragalactic X-ray sources. The transmission grating spectrometers provide spectral resolving powers of 100-2000 over the energy range 0.1-8 keV with reasonable sensitivity. These capabilities will allow Chandra to address a wide range of scientific problems, from the physics of stellar coronae to cosmology. In this lecture, I will describe how we developed the periodic nanostructures of the High Energy Transmission Grating Spectrometer and how it works for point and extended sources. Then I will focus on a few early science objectives, including searching for the missing baryons in the universe.

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