Searching for the 511 keV annihilation line from galactic compact objects with the IBIS gamma ray telescope

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Table 5

511 keV 2σ flux upper limits for the hard X (E > 20 keV) Supernova Remnants (SNR) reported in the 3rd IBIS catalog (Bird et al. 2007).

Source name	RA	Dec	Error^a	F₂₀₋₄₀^b	F₄₀₋₁₀₀^b	2σ flux limit
	(deg)	(deg)	(arcmin)	(mCrab)	mCrab	(10^-4 ph cm^-2 s^-1)

4U 0022+63	6.319	64.159	3.6	0.7 ± 0.1	0.7 ± 0.2	2.3
PSR J1811-1926	272.827	19.417	2.9	0.8 ± 0.1	1.0 ± 0.2	14
IGR J18135-1751	273.395	–17.871	2.2	1.1 ± 0.1	1.7 ± 0.2	2.3
SNR 021.5-00.9	278.388	–10.579	1.2	3.3 ± 0.1	3.3 ± 0.2	3.0
AX J1838.0-0655	279.509	–6.916	1.5	1.9 ± 0.1	3.0 ± 0.2	2.9
Kes 73	280.338	–4.948	1.3	2.2 ± 0.1	4.2 ± 0.2	2.9
AX J1846.4-0258	281.596	–2.983	1.8	1.7 ± 0.1	2.4 ± 0.2	2.8
Cas A	350.848	58.815	0.9	4.1 ± 0.1	2.4 ± 0.2	2.5

Notes.

^(a)

Position error expressed as radius of 90% confidence circle in arcminutes.

^(b)

Fluxes averaged over the total exposure: 20–40 keV: 1 mCrab = 7.57 × 10^-12 erg cm^-2 s^-1 = 1.71 × 10^-4 ph cm^-2 s^-1 40–100 keV: 1 mCrab = 9.42 × 10^-12 erg cm^-2 s^-1 = 9.67 × 10^-5 ph cm^-2 s^-1.

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