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Calibration targets
Sour ce Energy Flux Simplicity Var keV HZ 43 < 0.2 Bright WD No Sirius B < 0.2 HZ43 WD No /10 RXJ1856 < 1 Faint NS, No simple 1ES0102 0.4-1.5 Bright Complex No PKS2155 0.2Med Blazer Yes 20+ Capella 0.2-2 Bright Brems + Yes lines AR Lac Brems + lines HR 1099 0.5-6 Bright Brems + No lines Algol 0.5-6 Bright Brems + lines Crab 0.5Bright Yes Cas A No PSR Yes 1509 3C273 Bright Yes Mkn421 O836+71 1-100 Bright Bright FSRQ Yes Yes, spectral con stant Extend Lines Point Point Point 1' Point Point Point Point Point Yes Point Point, jet Point Con t Con t Con t Con t Con t Lines Con t Lines Lines Lines Lines Con t purpose

An initial, incomplete, list of calibration targets and their characteristics was developed. The list will be expanded with more detail about objects, and possibly links to archival data or publications about various sources. Ensembles of sources useful for different tasks (I.e. subsets of the whole list useful for effective area calibration, timing, ...) will be developed.


Calibration targets
Source Energy Flux keV Simplicity Var Extend Lines Yes Yes Line Move block of metal below detector, e.g. as seen from XMM pn coppe r Yes Line con taminati on purpose Perseu s cluster A2199 Oph i <20 cluster Cygnu s 0.3-5 loop On-board calibration sources with instrumental fluore scen ce lines Bursters

Star clusters Ngc2516 Highly absorbed sources Closed

Variability track ing, timing alignment Astrometry Star cluster Astrometry redistributio n Instrumental backg round


Future needs
Future missions Con -X Need s Energy scale > 6 keV, line shapes Lines w ith widths known < 100 km/s Comments Grating c alibration, XMS

Bright stellar flares On-boa rd ca libration sources with instrumental fluore scenc e lines Transfer stand ards

Conn ection o f low en ergy sources with high en ergy sources, targets for simultaneou sobs ervations

Problem of different expo sure times to ge t high qua lity spec tra, e.g. ksec for low x -rays but Msec for high en ergy missions

On orbit calibration schemes are not well developed for planned future observatory capabilities or even for putting current (plus past and future) missions on common and consistent scales. - Calibrating planned spectroscopic capabilities will be a combination of calibration and science observations - Making sense of joint observations will require further study of the techniques of simultaneous analysis such as presented by Burwitz and Marshall