Table 4
Molecular, neutral, and total hydrogen column densities and volume densities in the positions CO-peak, CO-void, and the LOS towards the quasars.
| (1) | (2) | (3) | (4) | (5) | (6) | (7) | (8) | (9) | (10) | (11) | (12) | |||||
| N(H2)COQ | N(H2)HCO+ | N(H)HCO+ | n(H)HCO + | N(H2)COP | N(H)COP | n(H)COP | N(H2)COV | N(H)COV | n(H)COV | N(H i)tot | ||||||
| cm-2 1020 | cm-2 1020 | cm-2 1021 | cm-3 103 | cm-2 1020 | cm-2 1021 | cm-3 103 | cm-2 1020 | cm-2 1021 | cm-3 103 | cm-2 1020 | ||||||
|
|
||||||||||||||||
| LOS toward quasar | CO-peak | CO-void | ||||||||||||||
| B0355+508 | ||||||||||||||||
| A | 10.4 ± 1.1 | 4.3 ± 0.7 | 2.5 ± 0.4 | 5.3 ± 0.9 | 13.1 ± 1.4 | 2.6 ± 0.3 | 5.7 ± 0.6 | 10.6 ± 1.1 | 2.1 ± 0.5 | 4.6 ± 0.6 | 62.8 | |||||
| B | <0.4 ± 0.1 | 4.7 ± 0.7 | 2.7 ± 0.4 | 5.8 ± 0.9 | 2.2 ± 1.6 | 0.4 ± 0.3 | 1.0 ± 0.7 | 3.7 ± 0.5 | 0.7 ± 0.2 | 1.6 ± 0.4 | ||||||
| C | 31.2 ± 3.1 | 4.7 ± 0.7 | 2.7 ± 0.4 | 5.8 ± 0.9 | 40.8 ± 4.1 | 8.2 ± 0.8 | 17.5 ± 1.8 | 10.0 ± 1.1 | 2.0 ± 0.5 | 4.3 ± 0.4 | ||||||
| D | <0.6 ± 0.1 | 4.0 ± 0.7 | 2.3 ± 0.4 | 4.9 ± 0.9 | – | – | – | – | – | – | ||||||
| E | <0.8 ± 0.1 | 4.3 ± 0.7 | 2.5 ± 0.4 | 5.3 ± 0.9 | – | – | – | – | – | – | ||||||
| B0212+735 | ||||||||||||||||
| F | – | 2.4 ± 0.4 | 1.4 ± 0.2 | 1.5 ± 0.2 | – | – | – | – | – | – | 16.8 | |||||
| G | 22.5 ± 4.8 | 10.8 ± 1.4 | 6.2 ± 0.8 | 6.7 ± 0.9 | 17.1 ± 1.8 | 3.4 ± 0.4 | 3.7 ± 0.4 | 11.2 ± 1.3 | 2.2 ± 0.2 | 2.4 ± 0.3 | ||||||
Notes. Estimated molecular and total hydrogen column densities and volume densities along the line of sight towards the quasars and in the positions CO-peak and CO-void. The footnotes CO and HCO+ note the underlying method used to derive these values. The CO-footnotes Q, P, V represent the positions LOS towards the quasar, CO-peak and CO-void. (1) Designation of the assigned velocity components. (2), (6), and (9) Molecular hydrogen column density derived from the CO emission by the use of Eq. (2). Liszt et al. (2010) give a N(H2)CO of N(H2)CO ≈ 35 × 1020 cm-2 for the LOS towards B0355+508. This value corresponds to the N(H2)CO derived for component C along the line of sight towards B0355+508. (3) Molecular hydrogen column density derived from the HCO+ absorption along the line toward the quasar by the use of Eq. (1). The here calculated N(H2)HCO+ for the components towards B0355+508 are consistent with the N(H2)HCO+ given by Liszt et al. (2010) of N(H2)HCO+ ≈ 4.5 × 1020 cm-2. (4) Total hydrogen column derived from N(H2)HCO+ and an assumed H2 fraction of 35%; N(H)HCO + = 5.7 × N(H2)HCO+. (7) and (10) Lower limits of the total hydrogen column density derived from the CO emission; N(H)COP/V = 2 × N(H2)COP/V. The (unknown) contribution of H i to the total amount of hydrogen is not considered. (5), (8), and (11) Volume hydrogen densities, derived by dividing N(H) by the assumed cloud diameter dC for an assumed cloud distance of 150 pc (dC(B0355+508)= 0.15 pc, dC(B0212+735)= 0.3 pc); n(H)= N(H)/dC. (12) Total H i column density of the cold interstellar gas along the lines of sight towards the quasars. From Dickey et al. (1983).
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