Discovery of two embedded massive YSOs and an outflow in IRAS 18144-1723
  Massive stars are rarely seen to form in isolation. It has been proposed that
association with companions or clusters in the formative stages is vital to
their mass accumulation. In this paper we study IRAS~18144-1723, a massive
young stellar object (YSO) which had been perceived in early studies as a
single source. In the CO(3-2) line, we detect an outflow aligned well with the
outflow seen in H$_2$ in this region. We show that there are at least two YSOs
here, and that the outflow is most likely to be from a deeply embedded source
detected in our infrared imaging. Using multi-wavelength observations, we study
the outflow and the embedded source and derive their properties. We conclude
that IRAS~18144 hosts an isolated cloud, in which at least two massive YSOs are
being born. From our sub-mm observations, we derive the mass of the cloud and
the core hosting the YSOs.
