2024-03-28T12:08:40Zhttp://digital.csic.es/dspace-oai/requestoai:digital.csic.es:10261/26462022-10-10T10:57:45Zcom_10261_135com_10261_4col_10261_388
Moro-Martín, Amaya
Noriega-Crespo, A.
Cesarsky, D.
Cabrit, S.
Cernicharo, José
Lefloch, Bertrand
2008-01-02T13:19:10Z
2008-01-02T13:19:10Z
2003-05-07
arXiv:astro-ph/0305108v1
The Astrophysical Journal Letters, 590:L41–L44, 2003 June 10
1538-4357
http://hdl.handle.net/10261/2646
10.1086/376673
We report on spectro-imaging observations of the Herbig-Haro 2 outflow with the ISOCAM camera onboard the Infrared Space Observatory (ISO). The [Ne II}] 12.81 microns and [Ne III]15.55 microns lines are detected only towards the jet working surface (HH 2H), consistent with the high excitation of this knot in the optical range, while H2 pure rotational emission is found all over the shocked region HH 2. The low energy transition S(2) traces warm gas (T approx. 400K) peaked towards knots E-F and extended ejecta (T approx. 250-380) with masses of a few 0.001 solar mass in the high-velocity CO outflow extending between the powering source and HH 2. Such emission could arise from low-velocity C-type shocks (v= 10-15 km/s). The higher transitions S(3)-S(7) trace the emission of hot shocked gas (T= 1000-1400K) from individual optical knots in the HH 2 region. The ortho to para (OTP) ratio exhibits large spatial variations between 1.2 (E) and 2.5 (H), well below its value at LTE. The emission of the S(3)-S(7) lines is well accounted for by planar C-shock models with a typical velocity V= 20-30 km/s propagating into a medium of density 10^4-10^5 cm-3 with an initial OTP ratio close to 1 in the pre-shock gas. In the leading edge of the jet, where the geometry of the emission allows a simple modelling, a good agreement is found with velocities derived from the optical proper motions measured in the ionized gas.
eng
openAccess
Stars: formation
ISM: Herbig‐Haro objects
ISM: individual (HH 1–2)
ISM: jets and outflows
ISM: molecules
Warm Molecular Hydrogen and Ionized Neon in the HH2 Outflow
preprint