We therefore aim to detect the o-H 2O 8 2,7в€’7 3,4 line in a star forming region for the first time. Water maser models predict that several THz water masers should be detectable in these objects. We wish to probe the physical conditions and water abundance in the inner layers of the host protostellar object NGC 7538-IRS1 using a highly excited H 2O line. Despite numerous water line observations over a broad range of energies obtained with the Herschel Space Observatory, observations were not able to trace the emission from the hot core around the newly forming protostellar object in most of the sources.ДЄims. Accumulating a large amount of mass infalling within a single entity in spite of radiation pressure is possible if, in addition to several other conditions, enough thermal energy is released. The formation of massive stars ( M> 10 M вЉ™, L > 10 3 L вЉ™) is still not well understood. 77, 50937 Cologne, GermanyД¤ Max-Planck-Institut fГјr Radioastronomie, Auf dem HГјgel 69, 53121 Bonn, GermanyД¬ontext. Institut, University of Cologne, ZГјlpicher Str. of Manchester, Oxford Road, M13 9PL, UKДЈ I. Bordeaux, CNRS, B18N, allГ©e Geoffroy Saint-Hilaire, 33615 Pessac, FranceД®-mail: JBCA, School of Physics and Astronomy, Univ. Wiesemeyer 4ДЎ Laboratoire dвЂ™astrophysique de Bordeaux, Univ. Astronomical objects: linking to databasesДЇ.

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Merlin project predictions 2016