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Fig. 2

image

Jet FWHM versus deprojected distance from the source. Full circles show the DO Tau FWHM directly measured on the deconvolved images (upper limit to jet diameter) while open circles give the same values corrected for the estimated PSF FWHM (= 0.′′06), giving a lower limit to the jet diameter. All measurements from the other jets have been corrected for their respective estimated PSF FWHM. Errors bars for DO Tau are 3σ. For DO Tau, we assume an inclination of the jet axis to the line of sight of i = 23.5°. The full and dashed lines are fits of the jet FWHM for z = 35–300 au with deprojected semi-opening angles of 1.1° and 1.4° respectively. We also show FWHM for the DG Tau [Fe  II] HVC (blue lobe) from Agra-Amboage et al. (2011), for the RW Aur jet (red lobe) from Woitas et al. (2002), and for the HH 212 jet from Lee et al. 2017. Adopted jet inclination to the line of sight are i = 37° for DG Tau (Bacciotti et al. 2018), i = 55.5° for RW Aur (Rodriguez et al. 2018).

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