SIMBAD references

2014ApJ...786...99L - Astrophys. J., 786, 99 (2014/May-2)

Velocity-resolved [Ne III] from X-ray irradiated Sz 102 microjets.


Abstract (from CDS):

Neon emission lines are good indicators of high-excitation regions close to a young stellar system because of their high ionization potentials and large critical densities. We have discovered [Ne III] λ3869 emission from the microjets of Sz 102, a low-mass young star in Lupus III. Spectroastrometric analyses of two-dimensional [Ne III] spectra obtained from archival high-dispersion (R ~ 33, 000) Very Large Telescope/UVES data suggest that the emission consists of two velocity components spatially separated by ∼0.''3, or a projected distance of ∼60 AU. The stronger redshifted component is centered at ∼ + 21 km/s with a line width of ∼140 km/s, and the weaker blueshifted component at ∼ - 90 km/s with a line width of ∼190 km/s. The two components trace velocity centroids of the known microjets and show large line widths that extend across the systemic velocity, suggesting their potential origins in wide-angle winds that may eventually collimate into jets. Optical line ratios indicate that the microjets are hot (T ≲ 1.6x104 K) and ionized (ne ≳ 5.7x104/cm3). The blueshifted component has ∼13% higher temperature and ∼46% higher electron density than the redshifted counterpart, forming a system of an asymmetric pair of jets. The detection of the [Ne III] λ3869 line with the distinct velocity profile suggests that the emission originates in flows that may have been strongly ionized by deeply embedded hard X-ray sources, most likely generated by magnetic processes. The discovery of [Ne III] λ3869 emission along with other optical forbidden lines from Sz 102 supports the picture of wide-angle winds surrounding magnetic loops in the close vicinity of the young star. Future high-sensitivity X-ray imaging and high angular-resolution optical spectroscopy may help confirm the picture proposed.

Abstract Copyright:

Journal keyword(s): ISM: individual: Sz 102 - ISM: jets and outflows - ISM: kinematics and dynamics - stars: mass-loss - stars: pre-main sequence - X-rays: stars

Simbad objects: 13

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