Radio continuum emission from knots in the DG Tau jet

Abstract

Context: HH 158, the jet from the young star DG Tau, is one of the few sources of its type where jet knots have been detected at optical and X-ray wavelengths. Aims: To search, using Very Large Array observations of this source, radio knots and if detected, compare them with the optical and X-ray knots. To model the emission from the radio knots. Methods: We analyzed archive data and also obtained new Very Large Array observations of this source, as well as an optical image, to measure the present position of the knots. We also modeled the radio emission from the knots in terms of shocks in a jet with intrinsically time-dependent ejection velocities. Results: We detected radio knots in the 1996.98 and 2009.62 VLA data. These radio knots are,within error, coincident with optical knots. We also modeled satisfactorily the observed radio flux densities as shock features from a jet with intrinsic variability. All the observed radio, optical, and X-ray knot positions can be intepreted as four successive knots, ejected with a period of 4.80 years and traveling away from the source with a velocity of 198 km s${}^{-1}$ in the plane of the sky. Conclusions: The radio and optical knots are spatially correlated and our model can explain the observed radio flux densities. However, the X-ray knots do not appear to have optical or radio counterparts and their nature remains poorly understood.

8 pages, 8 figures, to appear in Astronomy & Astrophysics

References in corpus (7)

• VLBA determination of the distance to nearby star-forming regions I. The distance to T Tauri with 0.4% accuracy
• Discovery of a bipolar X-ray jet from the T Tauri star DG Tau
• T Tauri Jet Physics Resolved Near The Launching Region with the Hubble Space Telescope
• X-rays from jet-driving protostars and T Tauri stars
• The nature of the soft X-ray source in DG Tau
• Revealing the fastest component of the DG Tau outflow through X-rays
• Proper Motion Studies of Outflows from Classical T Tauri Stars

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