Table 3
Gamma-ray characteristics of globular clusters.
| Name | α J2000 | δ J2000 | r 95 | σ ext | TS |
|
Photon flux | Energy flux | Γ | E c | sc |
|
|
|||||||||||
| 47 Tucanae | 00h23.8m | −72°04′ | 3.3′ | <4.8′ | 603.3 | 9.6 |
|
|
|
|
5.6 |
| Omega Cen | 13h26.5m | −47°29′ | 7.5′ | < 8.4′ | 50.0 | 14.6 |
|
|
|
|
4.0 |
| M 62 | 17h01.1m | −30°08′ | 4.4′ | < 7.2′ | 107.9 | 16.0 |
|
|
|
|
2.5 |
| NGC 6388 | 17h35.9m | −44°41′ | 5.7′ | < 9.0′ | 86.6 | 13.8 |
|
|
|
|
3.3 |
| Terzan 5 | 17h47.9m | −24°48′ | 2.9′ | < 9.0′ | 341.3 | 25.5 |
|
|
|
|
7.1 |
| NGC 6440 | 17h48.8m | −20°21′ | 5.2′ | < 8.4′ | 65.7 | 5.9 |
|
|
|
|
1.4 |
| M 28 | 18h24.4m | −24°51′ | 8.0′ | < 15.6′ | 77.9 | 20.6 |
|
|
|
|
4.3 |
| NGC 6652 | 18h35.7m | −33°01′ | 7.5′ | < 9.6′ | 54.8 | 9.8 |
|
|
|
|
3.2 |
|
|
|||||||||||
| NGC 6541 | 18h07.9m | −43°41′ | 20.1′ | ... | 12.0 | ... | < 1.1 | < 0.8 | (1.4) | (1.6) | ... |
| NGC 6752 | 19h10.3m | −59°56′ | 6.3′ | ... | 13.7 | ... | < 0.7 | < 0.5 | (1.4) | (1.6) | ... |
| M 15 | 21h29.4m | + 12°06′ | 6.9′ ∗ | ... | 5.4 | ... | < 0.6 | < 0.5 | (1.4) | (1.6) | ... |
Notes. Columns are (1) source name, (2) fitted Right Ascension (J2000) of LAT source, (3) fitted Declination (J2000) of LAT source, (4) 95% confidence level error radius (∗ for M 15 the 68% confidence level error radius is quoted because the small significance of the detection does not allow to define a meaningful 95% confidence level error radius), (5) 2σ upper limit on source extent, defined as σ of a 2D Gaussian intensity profile, (6) value of Test Statistic, (7) as a measure of source variability, (8) integrated > 100 MeV photon flux in units of 10-8 ph cm-2 s-1, (9) integrated > 100 MeV energy flux in units of 10-11 erg cm-2 s-1, (10) spectral index Γ of exponential cut-off power law, assuming N(E) ∝ E − Γe − E/Ec, (11) cut-off energy Ec in GeV, and (12) significance of exponential cut-off in units of Gaussian σ.
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