Astronomy and Astrophysics – Astronomy
Scientific paper
May 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994mnras.268..354r&link_type=abstract
Monthly Notices of the Royal Astronomical Society, Vol. 268, NO. 2/MAY15, P. 354, 1994
Astronomy and Astrophysics
Astronomy
3
Shock Waves - Ism: Clouds - H Ii Region - Ism: Jets And Outflows
Scientific paper
The compact condensations of Herbig-Haro (HH) objects can be interpreted in terms of the `shocked cloudlet' or the `interstellar bullet' scenario. In these models, a high-density clump is assumed to have a high relative velocity with respect to the surrounding environment, leading to the formation of a radiative bowshock, which produces the observed emission. We show that, for relative velocities > 100 km s-1, a photoionized pre-ionization region is formed. This H II region should be observed as a faint, diffuse emission around the compact condensations.
The really interesting property of the pre-ionized H II region is that it will survive the eventual disruption of the dense clump (which occurs as a result of the clump/ environment interaction), and should be observable as a `fossil H II region' for a timescale of ˜1000 yr (for parameters typical of HH objects). The emission-line spectrum of this fossil H II region is formed in a partially ionized gas, so that it is qualitatively similar to the spectrum observed in HH objects. We speculate that at least some of the condensations of HH objects might correspond to such fossil H II regions.
Raga Alejandro C.
Wang Lanjuan
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