eROSITA Technical Performance
The eROSITA Instrument
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![Table 1: Basic instrument characteristics at launch (From Predehl et a. 2021).](/7646383/original-1623156254.jpg?t=eyJ3aWR0aCI6MjQ2LCJvYmpfaWQiOjc2NDYzODN9--85c216db7f4f3d27b137e8e6dc78d2d30c3467bf)
Table 1: Basic instrument characteristics at launch (From Predehl et a. 2021).
![Table 2: Energy resolution [eV] and quantum efficiencies (QE) of the eROSITA Camera Assemblies as measured on ground. “QE12346” is for cameras TM1,2,3,4,6, which have filters directly deposited onto the CCD; “QE57” is the quantum efficiency of cameras TM5 and TM7, which have their filters in the filter wheel. From Predehl et al. (2021).](/7646450/original-1623156253.jpg?t=eyJ3aWR0aCI6MjQ2LCJvYmpfaWQiOjc2NDY0NTB9--c51c31687b8287d9d2d6c8b0e0b3a70f8f7d14ed)
Table 2: Energy resolution [eV] and quantum efficiencies (QE) of the eROSITA Camera Assemblies as measured on ground. “QE12346” is for cameras TM1,2,3,4,6, which have filters directly deposited onto the CCD; “QE57” is the quantum efficiency of cameras TM5 and TM7, which have their filters in the filter wheel. From Predehl et al. (2021).
![Figure 1: Comparison of the Field of View average effective areas as a function of energy for eROSITA (red), Chandra ACIS-I (in 1999, dark green, and in 2020, light green), Chandra HRC-I (purple), XMM-Newton (blue), and ROSAT (brown). From Predehl et al. (2021).](/7604528/original-1623156253.jpg?t=eyJ3aWR0aCI6MjQ2LCJvYmpfaWQiOjc2MDQ1Mjh9--1c514608e5b75f3af1afd25d73f28918458e79f7)
Figure 1: Comparison of the Field of View average effective areas as a function of energy for eROSITA (red), Chandra ACIS-I (in 1999, dark green, and in 2020, light green), Chandra HRC-I (purple), XMM-Newton (blue), and ROSAT (brown). From Predehl et al. (2021).
![Figure 2: Comparison of the grasp, defined as the product of field of view times (averaged) effective area, as a function of energy for eROSITA (red), Chandra ACIS-I (in 1999, dark green, and in 2020, light green), Chandra HRC-I (purple), XMM-Newton (blue), and ROSAT (brown). From Predehl et al. (2021).](/7604588/original-1623156253.jpg?t=eyJ3aWR0aCI6MjQ2LCJvYmpfaWQiOjc2MDQ1ODh9--a00e0d615bfa0515ef2c9b469347358f82220497)
Figure 2: Comparison of the grasp, defined as the product of field of view times (averaged) effective area, as a function of energy for eROSITA (red), Chandra ACIS-I (in 1999, dark green, and in 2020, light green), Chandra HRC-I (purple), XMM-Newton (blue), and ROSAT (brown). From Predehl et al. (2021).
![Table 3: Some key performance parameters of the eROSITA Mirror Assemblies as calibrated on ground: The on-axis angular resolution (HEW [arcsec]) is corrected for the detector resolution. The PSF has been measured also at C-K but is omitted here because it is almost identical to Al-K. The FWHM [arcsec] is an approximate value of the mirror-detector combination. The on-axis effective areas [cm^2] were measured using the standard setup. Errors are 1σ for PSF and 3σ for effective areas.](/7646481/original-1623156253.jpg?t=eyJ3aWR0aCI6MjQ2LCJvYmpfaWQiOjc2NDY0ODF9--97f846c42856b4309bf1ea7d508e1958bea8d324)
Table 3: Some key performance parameters of the eROSITA Mirror Assemblies as calibrated on ground: The on-axis angular resolution (HEW [arcsec]) is corrected for the detector resolution. The PSF has been measured also at C-K but is omitted here because it is almost identical to Al-K. The FWHM [arcsec] is an approximate value of the mirror-detector combination. The on-axis effective areas [cm^2] were measured using the standard setup. Errors are 1σ for PSF and 3σ for effective areas.