Table 5: Interstellar component characteristics derived from the absorption lines in the UV and optical spectrum. The ions absorption in component 1 may be distributed over the velocities of components A and B however the fits have been performed with one component. Velocities: the listed uncertainties on $V_{\rm LSR}$ apply to relative velocities. The absolute uncertainty from the precision of the STIS wavelength calibration is about $1.2~{\rm {km~s}}^{-1}$, absolute velocities have however been confirmed to about $0.3~{\rm {km~ s}}^{-1}$ by the good agreement between component C and the CO emission in the heterodyne data, which have an absolute precision of $0.1~{\rm {km~ s}}^{-1}$. Temperature: when possible, temperatures are derived from the combination of b-values from species of different masses. The precise temperatures for components A and B have been derived under the assumption that they can be identified to the two components seen in emission in the Blue Cloud H  I spectrum. Column densities (in cm-2): numbers in parentheses are powers of 10. All error bars are 3$\sigma $ uncertainties, except for the intervals given by the arrows, indicating and upper limit derived from a faint line and a lower limit derived from a strong saturated line. Si  II, C  II and C  II* profiles are saturated for all components, implying that only a lower limit could be derived for the whole absorption.
Component A C B      
$ V_{\rm LSR}~({\rm {km~ s}^{-1}}) $ 3.8$~\pm~0.1$ 2.7$~\pm~0.2$ 0.4$~\pm~0.1$      
T (K) $85 \pm 65$ - $270\pm100 $      
$ b_{NT}~({\rm ~ km ~ {s}^{-1}})$ $1.5\pm0.2$ $1.6\pm 0.2$ $1.5\pm0.2$      
${\rm {CO}}~ J=0$   $3.3\!\pm_{0.5}^{0.3}~(13)$        
${\rm {CO}}~ J=1$   $2.1\!\pm_{0.3}^{0.4}~(13)$        
${\rm {CO}}~ J=2$   <2.5 (12)        
${\rm {CH}}$   $6.5\pm1.5~(12) $        
${\rm {CH}^{+}}$ $9\pm2~(12)$   $4\pm1~(12)$      
C  I (3P0) $3.5\!\pm_{0.3}^{0.5}~(14)$   $1.3\!\pm_{0.3}^{0.2}~(14)$      
C  I* (3P1) $6.6\!\pm_{0.7}^{0.8}~(13)$   $2.7\pm0.5~(13)$      
C  I**(3P2) $1.1\pm0.15~(13)$   $3.0\!\pm_{1.1}^{2.2}~(12)$      
S  I $4.4\!\pm_{0.5}^{0.6}~(12)$   $2.0\pm0.5~(12)$      
Fe  I $1.50\pm1.0~(11)$   <2.81 (10)      
Component 1 (A+B) 2 3 4
$ V_{\rm LSR}~({\rm {km~ s}^{-1}}) $ $2.5\pm0.3$ $-5.5\pm0.2$ $-11.0\pm0.2$ $-18.7\pm0.2$
T (K) - 8500 $\pm 1500$ $13~000 \pm 3000$ $\sim$20 000-$\geq$200 000
             
Fe  II $2.2\pm 1.1 (14)$ $1.2\!\pm_{0.3}^{0.1}~(13)$ $1.3\pm0.2~(13)$ $1.4\pm0.2~(13)$
Mg  II $1.8\pm_{0.5}^{0.3}~(15)$ $1.9~(12)\mapsto1.2~(14)$ $2.3~(12)\mapsto1.5~(14)$ $2.9~(12)\mapsto1.6~(14)$
S  II >3.0 (16) $5.0\!\pm_{1.5}^{2.0}~(13)$ $1.0\pm0.2~(13)$ $1.1\!\pm_{0.2}^{0.4}~(14)$
P  II $2.5\pm1.0~(14)$ <1.6 (13) <2.4 (13) <2.7 (13)
Mn  II $1.3\pm_{0.1}^{0.2}~(13)$ $1.2\pm1.0~(11)$ $1.6\pm1.0~(11)$ $1.4\pm1.0~(11)$
C  II >1.3 (14)  
C  II* >1.3 (14)  
Si  II >1.0 (14)  
Si  II* <2.4 (12) <1.6 (12) <1.8 (12) >3.2 (13)
Ni  II $7.0\pm2~(12)$ <1.6 (13) <1.2 (13) <1.4 (13)
Mg  I $2.25\!\pm_{0.28}^{0.5}~(12)$ <2.1 (11) <2.1 (11) $7\pm4$ (10)
O  I $4.1\pm 1.6~(17)$ $3.2~(13)\mapsto6.2~(16)$ $3.4~(13)\mapsto4~(16)$ $3.1~(13)\mapsto3.7~(16)$
N  I $2.0\pm1.0~(17)$ $1.5~(14)\mapsto1.2~(16)$ $2.7~(14)\mapsto1.9~(16)$ $3.0~(14)\mapsto1.2~(17)$
S  III       <2.4 (13)
Si  III       >6 (12)
Si  IV       $8.2\pm3.2~(12)$
C  IV       $1.45\pm0.6~(13)$


Source LaTeX | All tables | In the text