Hostname: page-component-cd9895bd7-dk4vv Total loading time: 0 Render date: 2025-01-06T02:29:59.601Z Has data issue: false hasContentIssue false
  • English
  • Français

Dense cores in the HH24–26 outflow region

Published online by Cambridge University Press:  04 August 2017

K. M. Menten ,
C. M. Walmsley  and
R. Mauersberger
K. M. Menten
Affiliation:
Max-Planck-Institut für Radioastronomie Auf dem Hügel 69 D-5300 Bonn 1, F.R.G.
C. M. Walmsley
Affiliation:
Max-Planck-Institut für Radioastronomie Auf dem Hügel 69 D-5300 Bonn 1, F.R.G.
R. Mauersberger
Affiliation:
Max-Planck-Institut für Radioastronomie Auf dem Hügel 69 D-5300 Bonn 1, F.R.G.

Extract

Core share and HTML view are not available for this content. However, as you have access to this content, a full PDF is available via the ‘Save PDF’ action button.

We have made observations of the (1,1) and (2,2) inversion lines of ammonia (NH3) towards the dark cloud region containing the Herbig-Haro (HH) objects 24–27. These transitions are only excited at H2 densities >104 cm−3, and thus probe high density gas. From the observed hyperfine splitting one can calculate optical depths. The optical depth ratio can be used to determine the rotational temperature T21 which is equal to the kinetic temperature under dark cloud conditions.

Type
Herbig-Haro Objects
Information
Symposium - International Astronomical Union , Volume 122: Circumstellar Matter , 1987 , pp. 179 - 180
Copyright
Copyright © Reidel 1987 

References

Cohen, M., Harvey, P.M., Schwartz, R.D., Wilking, B.A.: 1984, Ap. J. 278, 671 Google Scholar
Matthews, N. and Little, L.T.: 1983, M.N.R.A.S. 205, 123 Google Scholar
Snell, R.L. and Edwards, S.: 1982, Ap. J. 259, 668 Google Scholar
Snell, R.L. and Edwards, S.: 1984, Ap. J. 281, 237 Google Scholar
Strom, K.M., Strom, S.E., Vrba, F.J.: 1976, A.J. 81, 308 Google Scholar
Torrelles, J.M., Rodriguez, L.F., Canto, J., Carral, P., Marcaide, J., Moran, J., Ho, P.T.P.: 1983, Ap. J. 274, 214 Google Scholar