Astronomy and Astrophysics – Astrophysics
Scientific paper
2001-12-17
Astronomy and Astrophysics
Astrophysics
25 pages plus 8 figures. Accepted by the Astronomical Journal
Scientific paper
10.1086/339180
The HH 1/2 system has been observed with the two spectrometers on board the Infrared Space Observatory. Diffuse [CII] 158um emission indicate the presence of a Photo-Dissociation Region (PDR) which is only in part due to the external Far-UV irradiation from the nearby Orion Nebula. Additional irradiation must be originated locally and we show that the FUV field produced in the recombination regions behind the shocks traced by the HH objects is sufficient to induce a PDR at the flow cavity walls. The analysis of [OI], [SiII]34.8um and [NeII] 12.8um lines suggests shock velocities v=100-140 km/s with pre-shock densities between 100 and 1000 per cc. H2 pure rotational lines trace a T=600 K gas which is likely to be warmed up in slow, planar, molecular shocks. The coexistence in the areas subtended by the instrumental beamsizes of shocks at different velocities is consistent with the bow-shock morphology of the HH 1 and, to a lesser extent, HH 2 as traced by optical images.
Molinari Sergio
Noriega-Crespo Alberto
No associations
LandOfFree
Far Infrared Spectroscopy of the HH 1/2 Outflow does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Far Infrared Spectroscopy of the HH 1/2 Outflow, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Far Infrared Spectroscopy of the HH 1/2 Outflow will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-261256