Echoes of multiple outbursts of Sagittarius A⋆ revealed by Chandra

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Table 3

Average parameters of the five bright clouds.

Parameters	Br1	Br2	MC1	MC2	G0.11-0.11

Min distance to Sgr A^⋆(pc)^a	17.5	23.3	11.0	13.0	25.2
Flux (10^-6 ph cm^-2 s^-1)^b	5	6	7	6	6
CS antenna temp (K)^c	3	2.4	1.5	...	1.6
N₂H⁺ antenna temp (K)^c	1.8	1.6	0.7	0.4	0.7
Illumination duration (yr)^d	~2	~2?	~10	~10	~10

Notes.

^(a)

Projected distance to Sgr A^⋆.

^(b)

Average maximum 4–8 keV flux measured for each cloud.

^(c)

Peak emission value measured in CS (Tsuboi et al. 1999) and N₂H⁺ (Jones et al. 2012) maps. The MC2 cloud is not detected in CS maps.

^(d)

Illumination period which has been observed. Br2 illumination duration is a prediction since the decrease has not yet been observed.

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