AXTAR: Mission design concept

• Main Authors: Ray, Paul S. (Author), Chakrabarty, Deepto (Contributor), Wilson-Hodge, Colleen A. (Author), Philips, Bernard F. (Author), Wood, Kent S. (Author), Wolff, Michael T. (Author), Gwon, Chul S. (Author), Strohmayer, Tod E. (Author), Baysinger, Michael (Author), Briggs, Michael S. (Author), Capizzo, Peter (Author), Fabisinski, Leo (Author), Hopkins, Randall C. (Author), Hornsby, Linda S. (Author), Johnson, Les (Author), Maples, C. Dauphne (Author), Miernik, Janie H. (Author), Thomas, Dan (Author), de Geronimo, Gianluigi (Author), Remillard, Ronald A (Author), Levine, Alan M (Author)
• Other Authors: Massachusetts Institute of Technology. Department of Physics (Contributor), MIT Kavli Institute for Astrophysics and Space Research (Contributor), Remillard, Ronald Alan (Contributor), Levine, Alan M. (Contributor)
• Format: Article
• Language: English
• Published: SPIE, 2011-03-10T14:35:30Z.
• Subjects: Article
• Online Access: Get fulltext

The Advanced X-ray Timing Array (AXTAR) is a mission concept for X-ray timing of compact objects that combines very large collecting area, broadband spectral coverage, high time resolution, highly flexible scheduling, and an ability to respond promptly to time-critical targets of opportunity. It is optimized for submillisecond timing of bright Galactic X-ray sources in order to study phenomena at the natural time scales of neutron star surfaces and black hole event horizons, thus probing the physics of ultradense matter, strongly curved spacetimes, and intense magnetic fields. AXTAR's main instrument, the Large Area Timing Array (LATA) is a collimated instrument with 2-50 keV coverage and over 3 square meters effective area. The LATA is made up of an array of supermodules that house 2-mm thick silicon pixel detectors. AXTAR will provide a significant improvement in effective area (a factor of 7 at 4 keV and a factor of 36 at 30 keV) over the RXTE PCA. AXTAR will also carry a sensitive Sky Monitor (SM) that acts as a trigger for pointed observations of X-ray transients in addition to providing high duty cycle monitoring of the X-ray sky. We review the science goals and technical concept for AXTAR and present results from a preliminary mission design study.
United States. National Aeronautics and Space Administration (NASA) (APRA program NNG10WF45I )
Naval Research Laboratory (John C. Stennis Space Center) (6.1 Base Program)
MIT Kavli Instrumentation and Technology Development Fund