ISO observations of molecular hydrogen in HH 54: measurement of a non-equilibrium ortho- to para-H2 ratio

David A. Neufeld, Gary J. Melnick, Martin Harwit

We have detected the S(1), S(2), S(3), S(4) and S(5) pure rotational lines of molecular hydrogen toward the outflow source HH 54, using the Short Wavelength Spectrometer (SWS) on b…