Abstract
There is now compelling evidence that dark molecular clouds are clumpy. Much of the clumpiness is unresolved by single-dish telescopes but is apparent in the data from array telescopes. Molecular clumps may also be observed close to Herbig-Haro (HH) objects. These clumps are easily observable because they are `illuminated' due to the UV radiation from the shock front of the HH jet. A detailed observational and theoretical study of one HH clump has been performed and it indicates that this clump must be transient and has a similar density and temperature to those clumps detected in the cloud interior. Thus, HH clumps may be used as an independent method of determining physical parameters of the clumpiness of molecular clouds.
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References
Davis, C.J., Dent, W.R.F. and Burnell, S.J.B.: 1990, MNRAS 244, 173.
Girart, J.M., Rodriguez, L.F., Anglada, G. et al.: 1994, ApJ 435, L145.
Girart, J.M., Estalella, R., Ho, P.T.P. and Rudolph, A.L.: 2000, ApJ 539, 763.
Girart, J.M., Estalella, R., Viti, S. et al.: 2001, ApJ 562, L91.
Girart, J.M., Viti, S., Williams, D.A., Estalella, R. and Ho, P.T.P.: 2002, A&A 388, 1004.
Haro, G., 1952, ApJ 115, 572.
Herbig, G., 1951, ApJ 113, 697.
Hester, J.J., Stapelfeldt, K.R. and Scowen, P.A.: 1998, AJ 116, 372.
Morata, O., Girart, J.M. and Estalella, R.: 2002 A&A 397, 181.
Raga, A.C. and Williams, D.A.: 2000, A&A 358, 701.
Rudolph, A. and Welch, W.J.: 1988, ApJ 326, L31.
Rudolph, A. and Welch, W.J.: 1992, ApJ 395, 488.
Taylor, S.D. and Williams, D.A.: 1996, MNRAS 282, 1343.
Taylor, S.D., Morata, O. and Williams, D.A.: 1996, A&A 313, 269.
Torrelles, J.M., Rodriguez, L.F., Canto, J. et al.: 1992, ApJ 396, L95.
Viti, S. and Williams, D.A.: 1999, MNRAS 310, 517.
Viti, S., Girart, J.M., Garrod, R., Williams, D.A. and Estalella, R.: 2003, A&A 399, 187.
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Viti, S. Chemistry ahead of Herbig-Haro objects. Astrophysics and Space Science 287, 213–216 (2003). https://doi.org/10.1023/B:ASTR.0000006226.70216.13
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DOI: https://doi.org/10.1023/B:ASTR.0000006226.70216.13