The small-scale HH34 IRS jet as seen by X-shooter
B. Nisini, T. Giannini, S. Antoniucci, J.M. Alcala', F. Bacciotti, L., Podio

TL;DR
This study uses multiwavelength spectroscopy to analyze the physical conditions of the HH34 IRS jet, revealing its density, ionization, and composition, and comparing it to jets from more evolved stars.
Contribution
It provides detailed physical parameters of the inner jet region of a class I protostar using X-shooter spectra, highlighting similarities and differences with classical T Tauri star jets.
Findings
The high velocity jet is mostly neutral and very dense near the base.
The low velocity component is colder and has a subsolar iron abundance.
The jet's mass flux rate exceeds 5x10^{-7} solar masses per year.
Abstract
Very little information has been so far gathered on atomic jets from young embedded low mass sources (class I stars), especially in the inner jet region. We exploit multiwave spectroscopic observations to infer physical conditions of the inner region of HH34 IRS, a prototypical class I jet. We use a deep X-shooter spectrum ( lambda = 350-2300 nm, R between 8000 and 18000) detecting lines with upper energies from 8000 to 31000 cm-1 . Statistical equilibrium and ionization models are adopted to derive the jet main physical parameters. We derive the physical conditions for the extended high velocity jet (HVC, V about -100 km/s) and for the low velocity and compact gas (LVC, V about -20-50 \kms). At the jet base (< 200 AU) the HVC is mostly neutral (x(e)< 0.1) and very dense (n(H) > 5x10^5 cm-3). The LVC gas has the same density and A_V as the HVC, but it is a factor of two colder. Iron…
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