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Table 4

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

Abundance ratio Sources (young → old)
Sgr B2(M)
SO/OCS A24 A09 A02 A20 A26 A05 A07 A10 A13 A03 A01 A12 A06 A04 A14 A08
SO2/SO A20 A17 A26 A04 A10 A08 A05 A14 A09 A13 A12 A16 A06 A07 A03 A15 A01 A24 A02
SO2/OCS A22 A20 A26 A09 A24 A10 A05 A07 A13 A03 A04 A01 A12 A02 A06 A08 A14
SO2, v2=1/OCS, v2=1 A22 A20 A26 A07 A24 A09 A05 A03 A13 A04 A02 A12 A06 A08 A14
CH3CN/CH3OH A11 A24 A09 A26 A13 A10 A22 A20 A05 A27 A07 A03 A04 A23 A06
C2H3CN/HCCCN A02 A09 A01 A05 A07 A03 A10 A06 A04
C2H3CN, v10=1/HCCCN, v7=2 A02 A03 A01 A06
C2H5CN, v20=1/HCCCN, v7=2 A02 A03 A07 A01 A04 A05
C2H5CN/HNCO A06 A04 A13 A01 A02 A03 A07 A05 A09 A10
CH3CN/C2H5CN A11 A10 A05 A13 A09 A07 A02 A03 A04 A01 A06
C2H3CN/C2H5CN A07 A05 A10 A09 A04 A02 A03 A06 A01
C2H3CN, v10=1/C2H5CN, v20=1 A03 A01 A02
Sgr B2(N)
SO/OCS A02 A03 A20 A04 A01 A06 A10 A08 A16 A05 A07 A17
SO2/SO A08 A05 A06 A17 A07 A10 A04 A02 A03 A01
SO2/OCS A08 A02 A06 A05 A03 A04 A10 A17 A07 A01
SO2, v2=1/OCS, v2=1 A08 A06 A05 A02 A03 A07 A04 A01 A10
CH3CN/CH3OH A13 A08 A10 A05 A07 A04 A17 A03 A06 A02 A20 A01
C2H3CN/HCCCN A03 A06 A04 A02 A01 A08
C2H3CN, v10=1/HCCCN, v7=2 A06 A04 A02 A03 A01 A08
C2H5CN, v20=1/HCCCN, v7=2 A01 A03 A04 A02 A05
C2H5CN/HNCO A10 A01 A03 A08 A04 A06 A17 A02
CH3CN/C2H5CN A02 A08 A03 A01 A04 A10 A06 A17 A07 A05
C2H3CN/C2H5CN A02 A06 A04 A03 A08 A01
C2H3CN, v10=1/C2H5CN, v20=1 A04 A02 A03 A01

Notes. Evolutionary sequences of the individual sources in Sgr B2(M) and N based on abundance ratios of some chemical clocks. The sources in each row are ordered from young to old (evolved), whereby the absolute age is different for each row.

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