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Home All issues Volume 551 (March 2013) A&A, 551 (2013) A26 Full HTML
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Table 2

Analysis results and model predictions.

GC Eth1 NON2 NOFF2 1/α3 sig.4 r5 FUL(E > Eth)6 FUL/FIC;GC7 FUL/FIC;IR,opt,CMB7
name (TeV) (counts) (σ) (°) (ph cm-2 s-1)
a) point-like source analysis
NGC 104 0.72 72 941 18.2 2.6 – 1.9 × 10-12 2.6 × 10-1 2.1 × 101
NGC 6388 0.28 180 2365 14.9 1.6 – 1.5 × 10-12 8.0 × 10-2 1.6 × 100
NGC 7078 0.40 119 1988 15.0 −1.2 – 7.2 × 10-13 1.9 × 10-1 2.1 × 101
Terzan 6 0.28 202 8194 42.0 0.5 – 2.1 × 10-12 7.3 × 10-1 1.0 × 100
Terzan 10 0.23 76 2455 36.0 0.9 – 2.9 × 10-12 4.3 × 10-1 2.7 × 10-1
NGC 6715 0.19 159 2361 15.2 0.3 – 9.3 × 10-13 3.1 × 10-1 1.3 × 102
NGC 362 0.59 18 533 33.0 0.4 – 2.4 × 10-12 3.9 × 100 1.8 × 102
Pal 6 0.23 363 10 810 31.4 1.0 – 1.2 × 10-12 1.3 × 101 1.1 × 101
NGC 6256 0.23 64 1869 27.4 −0.5 – 3.2 × 10-12 1.8 × 101 2.9 × 101
Djorg 2 0.28 56 2387 39.4 −0.6 – 8.4 × 10-13 1.0 × 101 1.0 × 101
NGC 6749 0.19 84 2633 29.3 −0.6 – 1.4 × 10-12 2.5 × 101 4.1 × 101
NGC 6144 0.23 63 2196 30.8 −1.0 – 1.4 × 10-12 3.8 × 102 1.1 × 103
NGC 288 0.16 647 24 148 38.5 0.8 – 5.3 × 10-13 2.7 × 102 3.2 × 103
HP 1 0.23 67 2771 34.3 −1.6 – 1.5 × 10-12 5.2 × 102 1.7 × 102
Terzan 9 0.33 89 2556 31.7 0.9 – 4.5 × 10-12 2.6 × 104 9.0 × 102
b) extended source analysis
NGC 104 " 293 2016 7.4 1.2 0.22 2.3 × 10-12 2.3 × 10-1 1.9 × 101
NGC 6388 " 253 2818 12.9 2.2 0.11 1.7 × 10-12 9.2 × 10-2 1.8 × 100
NGC 7078 " 161 2386 14.0 −0.7 0.11 1.1 × 10-12 2.8 × 10-1 3.1 × 101
Terzan 6 " 304 9802 34.2 1.0 0.12 2.4 × 10-12 8.1 × 10-1 1.2 × 100
Terzan 10 " 218 4134 19.0 0.0 0.18 3.6 × 10-12 5.4 × 10-1 3.4 × 10-1
NGC 6715 " 159 2361 15.2 0.3 * 9.3 × 10-13 3.1 × 10-1 1.3 × 102
NGC 362 " 30 708 25.6 0.4 0.13 2.5 × 10-12 4.0 × 100 1.8 × 102
Pal 6 " 1148 17 631 16.6 2.5 0.18 2.1 × 10-12 2.4 × 101 1.9 × 101
NGC 6256 " 131 2524 20.4 0.6 0.13 3.9 × 10-12 2.1 × 101 3.5 × 101
Djorg 2 " 137 3753 24.8 −1.2 0.16 9.7 × 10-13 1.2 × 101 1.2 × 101
NGC 6749 " 168 3544 20.7 −0.3 0.14 2.1 × 10-12 3.6 × 101 5.9 × 101
NGC 6144 " 120 2913 23.9 −0.2 0.13 2.5 × 10-12 6.7 × 102 1.9 × 103
NGC 288 " 1030 30 767 30.7 0.8 0.13 6.1 × 10-13 3.1 × 102 3.7 × 103
HP 1 " 67 2771 34.3 −1.6 * 1.5 × 10-12 5.2 × 102 1.7 × 102
Terzan 9 " 206 3909 18.8 −0.1 0.16 4.1 × 10-12 1.8 × 104 6.2 × 102
stacking analysis
a) 0.23 2242 67 826 31.2 1.6 – 3.3 × 10-13 (5.4 (4.3
b) " 4425 92 037 21.6 2.4 – 4.5 × 10-13 (7.5 (5.9

Notes.

(1)

Energy threshold of the analysis, defined as the location of the peak in the distribution of reconstructed photon energies;

(2)

total number of on- and off-counts;

(3)

ratio between off- and on-exposure when applying the reflected background technique;

(4)

detection significance (pre-trial) following Li & Ma (1983);

(5)

extraction radius used for the analysis assuming extended emission; a star (*) denotes the cases where the calculated intrinsic extent is negligible compared to the PSF (see Sect. 2.2);

(6)

photon flux upper limits (99% c.l., following Feldman & Cousins 1998) assuming a power-law spectrum with an index of −2.5;

(7)

ratio between the upper limit and the expected IC flux using either the GC starlight (GC), or the sum of the Galactic infrared (IR), Galactic optical (opt) and the CMB background as target photon fields (see Sect. 3).

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