Free Access

Table 2

Event statistics for Regions A, B, and C.

Region Center Radius NON NOFF α Excess Significance Integral flux (> 0.6 TeV)
αJ2000 δJ2000 [°] [σ] [ph cm-2 s-1]

A 17h09m42.73s −44°29′8.2″ 0.10 71 717 0.11 −9.4 −1.0 <3.3 × 10-13
B 17h08m −44°16′48″ 0.60 3180 2488 1.06 543 7.0 =6.5 × 10-12
C 17h08m11s −44°20′ 0.71 4243 3425 1.06 615 6.8 =6.9 × 10-12

Notes. The center and the radius of each circular on-source (ON) region is given in Cols. 2–4. For Region A, the background was extracted from off-source (OFF) regions in the same field-of-view, while for Regions B and C, it was estimated from observations of separate OFF regions. Due to the smaller extent of Region A, more OFF regions could be used, which resulted in a smaller normalization factor α than for Regions B and C. The number of events in the ON and OFF integration regions, NON and NOFF, respectively, are given in Cols. 5 and 6. The significance (Col. 7) was calculated following the approach of Li & Ma (1983). The integral flux (or UL thereof) for each region is given in Col. 8. Note that the statistics presented here were obtained from a dataset comprised only of observations in 2007, which does not overlap with the one used in Aharonian et al. (2005a).

Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.

Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.

Initial download of the metrics may take a while.