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Home All issues Volume 518 (July-August 2010) A&A, 518 (2010) L111 Full HTML

 

 

Table 1:

Parameters of the hyperfine lines F' - F'' in the observed 111-000, J=3/2-1/2 ortho H2O+ transition, including predicted frequencies, Einstein-A and optical depth at low temperatures.
F' - F'' $\nu_{\rm M\ddot{u}rtz}^a$ $\nu_{\rm Strahan}$a $\nu_{\rm OH-based}$b A $\int \tau {\rm d}v$
  [MHz] [MHz] [MHz] [s-1] c
5/2-3/2 1 115 204.1 1 115 175.8 1 115 161 0.031 23.51
3/2-1/2 1 115 150.5 1 115 122.0 1 115 107 0.017 8.67
3/2-3/2 1 115 263.2 1 115 235.6 1 115 221 0.014 7.00
1/2-1/2 1 115 186.2 1 115 158.0 1 115 143 0.027 6.96
1/2-3/2 1 115 298.9 1 115 271.6 1 115 257 0.0035 0.88

Notes. (a) Predictions based on Strahan et al. (1986) and Mürtz et al. (1998). Nominal uncertainties are $\approx 2$ MHz but this is inconsistent with the discrepancy between the two predictions so that the actual uncertainty is unknown; (b) from the matching DR21 OH pattern by Guilloteau et al. (1984); (c)  $\int \tau_{\rm low-\it T}/N_{\rm H_2O^+} {\rm d}v$in 10-14 km s-1 cm2.


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