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We present multi-wavelength data on the globally infalling molecularcloud/protostellar cluster BYF 73. These include new far-IR spectral line andcontinuum data from SOFIA's Far Infrared Field-Imaging Line Spectrometer(FIFI-LS), mid-infrared (MIR) observations with the Thermal-Region CameraSpectrograph (T-ReCS) on Gemini-South, and 3 mm continuum data from theAustralia Telescope Compact Array (ATCA), plus archival data from Spitzer/IRAC,and Herschel/PACS and SPIRE. The FIFI-LS spectroscopy in [OI]$\lambda63 \mu$m,[OIII]$\lambda88 \mu$m, [OI]$\lambda145 \mu$m, and [CII]$\lambda158 \mu$mhighlights different gas environments in and between the dense molecular cloudand HII region. The photo-dissociation region (PDR) between the cloud and HIIregion is best traced by [OI]$\lambda145 \mu$m and may have density$>$10$^{10}$ m$^{-3}$, but the observed $\lambda145\mu$m/$\lambda63\mu$m and$\lambda63\mu$m/$\lambda158\mu$m line ratios in the densest gas are welloutside model values. The HII region is well-traced by [CII], with the$\lambda158\mu$m/$\lambda145\mu$m line ratio indicating a density of 10$^{8.5}$m$^{-3}$ and a relatively weak ionizing radiation field, 1.5 $\lesssim$log$(G/G_0)\lesssim$ 2. The T-ReCS data reveal eight protostellar objects inthe cloud, of which six appear deeply embedded ($A_V$ $>$ 30$^m$ or more) nearthe cloud's center. MIR 2 has the most massive core at $\sim$240 M$_{\odot}$,more massive than all the others combined by up to tenfold, with no obvious gasoutflow, negligible cooling line emission, and $\sim3-8$% of its4.7$\times$10$^3$ L$_{\odot}$ luminosity originating from the release ofgravitational potential energy. MIR 2's dynamical age may be as little as 7000yr. This fact, and the cloud's total embedded stellar mass being far less thanits gas mass, confirm BYF 73's relatively early stage of evolution.

Gemini, SOFIA, and ATCA Reveal Very Young, Massive Protostars in the Collapsing Molecular Cloud BYF 73