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We present $K$-band integral field spectroscopic observations towards 17massive young stellar objects (YSOs) in the low metallicity Small MagellanicCloud (SMC) and two YSO candidates in the compact H ii regions N81 and N88 A(also in the SMC). These sources, originally identified using $Spitzer$photometry and/or spectroscopy, have been resolved into 29 $K$-band continuumsources. By comparing Br$\gamma$ emission luminosities with those presented fora Galactic sample of massive YSOs, we find tentative evidence for increasedaccretion rates in the SMC. Around half of our targets exhibit emission line(Br$\gamma$, He i and H$_2$) morphologies which extend significantly beyond thecontinuum source and we have mapped both the emission morphologies and theradial velocity fields. This analysis also reveals evidence for the existenceof ionized low density regions in the centre outflows from massive YSOs.Additionally we present an analysis of optical spectra towards a similar sampleof massive YSOs in the SMC, revealing that the optical emission isphoto-excited and originates near the outer edges of molecular clouds, and istherefore consistent with a high mean-free path of UV photons in theinterstellar medium (ISM) of the SMC. Finally, we discuss the sample of YSOs inan evolutionary context incorporating the results of previous infrared andradio observations, as well as the near-infrared and optical observationspresented in this work. Our spectroscopic analysis in both the $K$-band and theoptical regimes, combined with previously obtained infrared and radio data,exposes differences between properties of massive YSOs in our own Galaxy andthe SMC, including tracers of accretion, discs and YSO--ISM interactions.

$K$-band integral field spectroscopy and optical spectroscopy of massive young stellar objects in the Small Magellanic Cloud