Liseau, R., Ceccarelli, C., Larsson, B., Nisini, B., White, G. J., Ade, Peter A. R. ![]() |
Abstract
The first detection of thermal water emission from a Herbig-Haro object is presented. The observations were performed with the Lws (Long Wavelength Spectrograph) aboard Iso (Infrared Space Observatory). Besides H_2_O, rotational lines of CO are present in the spectrum of HH 54. These high-J CO lines are used to derive the physical model parameters of the Fir (far-infrared) molecular line emitting regions. This model fits simultaneously the observed OH and H_2_O spectra for an OH abundance X(OH)=10^-6^ and a water vapour abundance X(H_2_O)=10^-5^. At a distance of 250pc, the total CO, OH and H_2_O rotational line cooling rate is estimated to be 1.3x10^-2^Lsun_, which is comparable to the mechanical luminosity generated by the 10km/s shocks, suggesting that practically all of the cooling of the weak-shock regions is done by these three molecular species alone.
Item Type: | Article |
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Date Type: | Publication |
Status: | Published |
Schools: | Physics and Astronomy |
Subjects: | Q Science > QB Astronomy |
Uncontrolled Keywords: | stars: formation, ism: molecules, ism: jets and outflows, ism: individual objects: hh 54, physical processes: shock waves, physical processes: radiative transfer |
Publisher: | EDP Sciences |
ISSN: | 0004-6361 |
Last Modified: | 28 Oct 2022 09:52 |
URI: | https://orca.cardiff.ac.uk/id/eprint/75933 |
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