In order to fulfil the IXO science requirements the following baseline instrument complement has been adopted:

1. Wide Field Imager (WFI)
2. Hard X-ray Imager (HXI)
3. X-ray Microcalorimeter Spectrometer (XMS)
4. High Time Resolution Spectrometer (HTRS)
5. X-ray Polarimeter (X-POL)
6. X-ray Grating Spectrometer (XGS)

The baseline instrument payload (see table below) is used during mission studies to scope the key elements of the mission and to ensure that the scientific requirements of the mission can be achieved. An Announcement of Opportunity will be issued at a later date inviting the community to propose specific instruments for the observatory.

	Above: Schematic illustration of the location of the instruments. Credit: ESA Left: Top view of the IXO instrument module; Below (left): assembly view of the IXO instrument module; Below (right): geometrical mathematical module. Credit: ESA

Wide-Field Imager (WFI)