A combined Compton and coded-aperture telescope for medium-energy gamma-ray astrophysics

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Table 2

Telescope performance comparison of a broadened line source at 511 ±1.3 keV for a 10⁶ second observation time.

	This work	INTEGRAL/SPI	e-ASTROGAM
Energy resolution	1.8	0.38	3
(% FWHM)
Angular resolution	2.1° Compton	2.5°	2.5°
(° FWHM)	<0.13° with mask
Effective area	143	~100	446
(cm²)	~72 with mask
3σ sensitivity on-axis	2.9 × 10⁻⁵	5.2 × 10⁻⁵	4.1 × 10⁻⁶
(ph cm⁻² s⁻¹)	5.8 × 10⁻⁵ with mask

Notes. For this study and for e-ASTROGAM, the angular resolution was optimized for sensitivity, and reconstruction was performed without electron tracking.

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