Physics
Scientific paper
Jan 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010aas...21547304p&link_type=abstract
American Astronomical Society, AAS Meeting #215, #473.04; Bulletin of the American Astronomical Society, Vol. 42, p.520
Physics
Scientific paper
The Wide Field X-ray Telescope (WFXT) will perform three very sensitive X-ray surveys (0.3-4 keV band), 100, 3000, and 20000 sq. deg, with a constant 5-10" PSF over the 1 degree field of view (FOV). These surveys will detect 105 normal galaxies that will allow, for the first time, a statistical study of their X-ray properties. Correlation between WFXT surveys and optical wide-area surveys such as Pan-STARRS and LSST will give redshift, galaxy type and environment information and help to identify low-luminosity AGN. Such a large sample will allow galaxies to be divided into various subsamples, e.g., based on optical properties, to test the impact of these properties on the X-ray luminosity function and scaling of X-ray luminosity with star-formation rate and stellar mass. WFXT will likely survey the Virgo Cluster, mapping the cluster galaxies and their interaction with the ICM with unprecedented sensitivity. The Magellanic Clouds should be observed fairly often in the course of the surveys (given their proximity to the South Ecliptic Pole), resulting in excellent monitoring of the binary population which in turn will constrain their accretion physics. The large FOV and low background of WFXT will allow diffuse emission in the Magellanic Clouds and large local group galaxies such as M31 to be studied in detail and compared with models of the hot ISM in galaxies. Repeated WFXT visits to Local Group galaxies will also be essential for gaining a complete census of transient X-ray sources such as white-dwarf super-soft sources, with the wide WFXT survey reaching a depth of 1035-36 ergs/s at 1 Mpc. These surveys will therefore vastly improve our understanding of the evolution of binary stellar populations, heating of the ISM, and the evolution of X-ray emission from galaxies.
Chu Yan-Yi
de Martino Domitilla
Forman William
Jones Christine
Ptak Andrew
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