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Fig. 4


Left panel: CH3OH maser structures detected with MERLIN around NGC 7538-IRS1. Contours are 16, 32, 64, 128, 256, 512, 1024  ×  0.15 Jy beam-1. The synthesized beam is 47 mas  ×  34 mas. Right panel: a close-up view of the CH3OH maser features detected with the EVN around NGC 7538-IRS1. The synthesized beam is 6.3 mas  ×  4.9 mas. The triangle symbols are the identified maser features in the present work scaled logarithmically according to their peak flux density. The maser LSR radial velocity is indicated by color. A 5 Jy beam-1 symbol is plotted for illustration in the right panels. The absolute reference position is and δ2000 =  + 61°28′10′′.506 as determined from the MERLIN observations. The linear polarization vectors, scaled logarithmically according to the polarization fraction P1 (Tables 2 and 3), are overplotted.

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