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We compare multi-epoch sub-arcsecond VLA imaging of the 22 GHz water maserstoward the massive protocluster NGC6334I observed before and after the recentoutburst of MM1B in (sub)millimeter continuum. Since the outburst, the watermaser emission toward MM1 has substantially weakened. Simultaneously, thestrong water masers associated with the synchrotron continuum point source CM2have flared by a mean factor of 6.5 (to 4.2 kJy) with highly-blueshiftedfeatures (up to 70 km/s from LSR) becoming more prominent. The strongestflaring water masers reside 3000 au north of MM1B and form a remarkable bowshock pattern whose vertex coincides with CM2 and tail points back to MM1B.Excited OH masers trace a secondary bow shock located ~120 au downstream. ALMAimages of CS (6-5) reveal a highly-collimated north-south structureencompassing the flaring masers to the north and the non-flaring masers to thesouth seen in projection toward the MM3-UCHII region. Proper motions of thesouthern water masers over 5.3 years indicate a bulk projected motion of 117km/s southward from MM1B with a dynamical time of 170 yr. We conclude that CM2,the water masers, and many of the excited OH masers trace the interaction ofthe high velocity bipolar outflow from MM1B with ambient molecular gas. Thepreviously-excavated outflow cavity has apparently allowed the radiative energyof the current outburst to propagate freely until terminating at the northernbow shock where it strengthened the masers. Additionally, water masers havebeen detected toward MM7 for the first time, and a highly-collimated CS (6-5)outflow has been detected toward MM4.

astrophysical journal/the astrophysical journal

The extraordinary outburst in the massive protostellar system  NGC6334I-MM1: Flaring of the water masers in a north-south bipolar outflow  driven by MM1B