Table 3
Molecular and neutral hydrogen column density estimates in units of 1021 cm-2.
| Parameter | Position | Absorption cloud velocity ( km s-1) | ||||||||||
| −120 | −106 | −92 | −80 | −73 | −58 | −47 | −40 | −23 | 0 | +20 | ||
|
|
||||||||||||
| N(H2) | (N) | 0.17(2) | 3.2(2) | 1.72(8) | 1.12(6) | 2.3(1) | 0.52(3) | 1.4(1) | 1.8(2) | 3.5(4) | 12(1) | 3.2(5) |
| N(H2)[1] | (N) | 4.8(5) | 2.9(1) | 0.48(3) | 3.0(1) | 3.1(4) | 14.6(16) | |||||
| N(H2)[2] | (M) | 6 | 1.2 | 0.9 | 9 | 3 | 16 | |||||
| N(H2)[3] | (M) | 5 | 9 | 4 | 14 | |||||||
|
|
||||||||||||
| N(Hi )[4] | (N) | 1.0(3) | 1.5(6) | 4.0(6) | ||||||||
|
|
||||||||||||
| f(H2) | (N) | 0.94(2) | 0.84(5) | 0.65(3) | ||||||||
|
|
||||||||||||
A
V
≈
|
(N) | 0.08 | 1.5 | 0.8 | 0.5 | 1.1 | 0.28 | 0.76 | 0.96 | 2.5 | >4.2 | >2.4 |
Notes. [1] Measurements are computed from PRIMOS observations in the velocity ranges listed in Greaves & Nyman (1996). [2–3] Values toward Sgr B2(M) from [2] Greaves & Nyman (1996) by conversion from H13CO+ and [3] Irvine et al. (1987) by conversion from 13CO. [4] Values toward Sgr B2(N) from Indriolo et al. (2015) from 21 cm Hi absorption. [5] Central extinction of the cloud, estimated by 2AV0 = AV = (NHI + 2NH2)/(2.2 × 1021 cm-2), from (Güver & Özel 2009).
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