Comparison of the high energy-resolution experiments on SRG, CHANDRA, XMM-NEWTON, and ASTRO-E

• CHANDRA: high-energy transmission gratings HETG intercept the X-rays from the mirror assembly.

• XMM-NEWTON: 2 of the 3 telescopes are equipped with reflection gratings RGS.

• ASTRO-E: uses microcalorimeters as detectors in the X-ray spectrometer XRS . Mission was lost during launch (Feb 2000).

• Energy Resolution (eV):

  Energy (keV)	0.8	1.5	2.5	6.1
  SODART-OXS	2.0	-	0.6	8.3
  CHANDRA-HETG	0.5	2.0	6.6	50
  XMM-RGS	3.5	10.5	34	-
  ASTRO_E-XRS	12	12	12	12

• Resolving Power (E/dE):

  Energy (keV)	0.8	1.5	2.5	6.1
  SODART-OXS	390	-	4000	730
  CHANDRA-HETG	1600	730	380	125
  XMM-RGS	230	145	73	-
  ASTRO_E-XRS	67	125	210	510

• Spectrometric Effective Area (cm²):

  Energy (keV)	0.8	1.5	2.5	6.1
  SODART-OXS	6.9	-	17	41
  CHANDRA-HETG	30	~170	53	34
  XMM-RGS	145	65	< 5	-

• Plots to compare the Energy Resolution, the Resolving Power, and the Effective Area