Abstract
Molecular clouds are clumpy on length scales down to the limits of observational resolution. At least some ultracompact Hii regions (UCHiiR) may result from the interaction of a young early type star and this type of cloud. The clumps can act as reservoirs of ionized gas distributed within the Hii region. These models reproduce the relatively long lifetimes implied by the population statistics of UCHiiR. We present line profile and emission measure plots based on the simplest case where the flow remains supersonic through to a recombination front. The morphology agrees with the shell-like UCHiiR as classified by Churchwell. The predicted line profiles are broad and double peaked with a separation of about 50 km s−1 for the example given.
This is a preview of subscription content, log in via an institution to check access.
Access this chapter
Tax calculation will be finalised at checkout
Purchases are for personal use only
Preview
Unable to display preview. Download preview PDF.
Similar content being viewed by others
References
Churchwell E.: 1990, Astron. Astrophys. Rev. 2, 79
Dyson J. E.: 1968, Astrophys. Space Sci. 2, 461
Dyson J. E.: 1994, in Ray T. P., Beckwith S. V. W., ed(s)., Lecture Notes in Physics 431. Springer-Verlag: Berlin, 92
Dyson J. E., Williams R. J. R. and Redman M. P.: 1995, Mon.Not.R.Astr.Soc. submitted
Hartquist T. W., Dyson J. E., Pettini M. and Smith L. J.: 1986, Mon.Not.R.Astr.Soc. 211, 715
Kurtz S., Churchwell E. and Wood D. O. S.: 1994, Astrophys. J.Suppl 91, 659
Mac Low M. M., Van Buren D., Wood D. O. S. and Churchwell E.: 1991, Astrophys.J. 369, 395
Williams R. J. R., Hartquist T. W. and Dyson J. E.: 1995, Astrophys. J. 446, 759
Wood D. O. S. and Churchwell E.: 1989, Astrophys. J.Suppl. 69, 831
Author information
Authors and Affiliations
Editor information
Editors and Affiliations
Rights and permissions
Copyright information
© 1995 Kluwer Academic Publishers
About this paper
Cite this paper
Redman, M.P., Williams, R.J.R., Dyson, J.E. (1995). All’s Knot Quiet on the Recombination Front. In: Millar, T.J., Raga, A.C. (eds) Shocks in Astrophysics. Springer, Dordrecht. https://doi.org/10.1007/978-94-009-1624-1_27
Download citation
DOI: https://doi.org/10.1007/978-94-009-1624-1_27
Publisher Name: Springer, Dordrecht
Print ISBN: 978-94-010-7225-0
Online ISBN: 978-94-009-1624-1
eBook Packages: Springer Book Archive