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Fig. 2


Position-velocity diagrams of the (J,K) = (6, 6), (7, 7), (9, 9), (10, 10), and (13, 13) lines observed with the JVLA B-array towards W51 IRS2. The cut is taken at the peak of the NH3 core and elongated east-west (i.e., PA = 90°). The zero offset in R.A. corresponds to the phase-center position used in imaging: , δ(J2000) = + 14°31′06.̋0. The contours are 1.5 and 3 mJy beam-1 for the (6, 6) line, and 1 and 2 mJy beam-1 for the remaining lines. The colors are linear from 0 to 10 mJy beam-1. The images were constructed with a 0.̋04 pixel for all transitions. The weak absorption in W51d2 is also indicated with a white cross. We note that the images displayed are not corrected for primary beam effects.

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