J/AN/333/209        Effective area of X-ray microcalorimeter  (Schartel+, 2012)
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Beginning of ReadMe : J/AN/333/209 Effective area of X-ray microcalorimeter (Schartel+, 2012) ================================================================================ Space astronomy for the mid-21st century: Robotically maintained space telescopes. Schartel N. <Astron. Nachrichten 333, 209 (2012)> =2012AN....333..209S ================================================================================ ADC_Keywords: Models ; Energy distributions ; X-ray sources Keywords: robotics - instrumentation: miscellaneous - space vehicles - telescopes - X-rays: general Abstract: The historical development of ground based astronomical telescopes leads us to expect that space-based astronomical telescopes will need to be operational for many decades. The exchange of scientific instruments in space will be a prerequisite for the long lasting scientific success of such missions. Operationally, the possibility to repair or replace key spacecraft components in space will be mandatory. We argue that these requirements can be fulfilled with robotic missions and see the development of the required engineering as the main challenge. Ground based operations, scientifically and technically, will require a low operational budget of the running costs. These can be achieved through enhanced autonomy of the spacecraft and mission independent concepts for the support of the software. This concept can be applied to areas where the mirror capabilities do not constrain the lifetime of the mission. Description: XMM-Newton has three X-ray telescopes. To estimate the total effective area of hypothetical X-ray microcalorimeter spectrometers onboard XMM-Newton we considered three components: the effective area of the telescopes, the filter transmission and the quantum efficiency of the microcalorimeter. The pn-CCD camera (Strueder L. et al., 2001A&A...365L..18S) is operated in the focal plane of X-ray telescope 3 which is the telescope without reflection grating array unit. We use the on-axis effective area of telescope 3 as provided in the current calibration file XRT3_XAREAEF_0011.CCF1. We approximate the transmission of the optical filters of the microcalorimeter through the transmission of the thick filter of pn (EPN FILTERTRANSX 0014.CCF). We assume a quantum efficiency (including filling factor and 'dead' detector elements) of 0.93 for energies below 4.5keV which decreases with  0.11ke/V for higher energies.

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