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Table 3

Evolutionary phases of the individual sources in Sgr B2(M) and N.

Source Number of H II regions Number and type of maser Outflow Evolution-phase Cluster
Sgr B2(M)

A01 6 1 × H2CO; 5 × H2O; 3 × NH3; >24 × OH OCS; SO IV CM1
A02 6.5 2 × H2CO; >33 × H2O; 1 × NH3; >36 × OH OCS; SO IV CM4
A03 1 × NH3; 7 × OH OCS; SO III CM1
A04 1 1 × CH3OH, class II(*) SO IV CM1
A05 2 × NH3; 1 × CH3OH, class II(*) II CM1
A06 3 × H2O; 2 × OH OCS; SO III CM1
A07 1 1 × H2O; 2 × NH3 OCS; SO IV CM1
A08 1.5 1 × H2O OCS; SO IV CM4
A09 I CM4
A10 2 × H2O; 1 × OH OCS III CM1
A11 2 × H2O II CM2
A12 I CM4
A13 I CM4
A14 OCS; SO ? CM4
A15 1 SO V CM4
A16 1 7 × OH OCS IV CM6
A17 I CM3
A18 I CM6
A19 I CM6
A20 I CM5
A21 1 × H2O II CM6
A22 I CM3
A23 I CM2
A24 1 SO V CM6
A25 I CM3
A26 1 1 × OH OCS IV CM6
A27 I CM6

Sgr B2(N)

A01 2 >47 × H2O; 5 × NH3 OCS; SO IV CN3
A02 3 × H2CO; 3 × H2O; 1 × NH3 OCS; SO III CN3
A03 1 1 × H2CO; 1 × H2O OCS IV CN4
A04 1 × H2O; 1 × OH OCS III CN4
A05 OCS ? CN2
A06 I CN2
A07 1 × H2O OCS III CN2
A08 1 × CH3OH, class II; 1 × H2CO; 1 × H2O; 1 × NH3 OCS III CN2
A09 I CN6
A10 1 OCS; SO V CN2
A11 I CN7
A12 I CN7
A13 1 × CH3OH, class II II CN5
A14 I CN6
A15 I CN6
A16 1 OCS V CN1
A17 OCS; SO ? CN3
A18 I CN6
A19 I CN1
A20 I CN1

Notes. When an H II region is not entirely contained within a source, it results in a non–integer quantity of H II regions. The CH3OH class II maser, which is marked with an asterisk(*) , is located at the edge of sources A04 and A05 and cannot be assigned to one of the two sources alone.

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