Astronomy and Astrophysics – Astrophysics
Scientific paper
Mar 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006a%26a...448l..57p&link_type=abstract
Astronomy and Astrophysics, Volume 448, Issue 3, March IV 2006, pp.L57-L60
Astronomy and Astrophysics
Astrophysics
9
Scientific paper
Context: .NGC 7538 is known to host a 6.7 and 12.2 GHz methanol maser cospatial with a Ultra Compact (UC) H II region, IRS 1.Aims.We report on the serendipitous discovery of two additional 6.7 GHz methanol masers in the same region, not associated with IRS 1.Methods.Interferometry maser positions are compared with recent single-dish and interferometry continuum observations.Results.The positions of the masers agree to high accuracy with the 1.2 mm continuum peak emission in NGC 7538 IRS 9 and NGC 7538 S. This clear association is also confirmed by the positional agreement of the masers with existing high resolution continuum observations at cm and/or mm wavelengths.Conclusions.Making use of the established strong relation between methanol masers and high-mas star formation, we claim that we have accurately positioned the high-mass protostars within the regions where they are detected. The variety of objects hosting a 6.7 GHz methanol maser in NGC 7538 shows that this emission probably traces different evolutionary stages within the protostellar phase.
Conway John E.
Minier Vincent
Motte Frederique
Pestalozzi Michele Roberto
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