Massive Protostars in a Protocluster—A Multi-scale ALMA View of G35.20-0.74N

Abstract We present a detailed study of the massive star-forming region G35.2-0.74N with Atacama Large Millimeter/submillimeter Array (ALMA) 1.3 mm multi-configuration observations. At 0.?2 (440 au) resolution, continuum emission reveals several dense cores along filamentary structure, consistent previous ALMA 0.85 0.?03 (66 we detect 22 compact sources, most which are associated filament. Four sources centimeter emission, and two these H30 ? recombination line emission. The kinematics shows ordered motion ionized gas, disk rotation and/or outflow expansion. construct models photoionized regions to simultaneously fit multiwavelength free–free fluxes total fluxes. derived properties suggest presence at least three young stars nascent hypercompact H ii regions. Two surrounded by large rotating structure that feeds individual disks, revealed gas tracers, such as SO 2 , CO, CH 3 OH. In particular, highlights spiral structures in one disks probes faster-rotating inner disks. 12 CO from general complex four outflows identified. remaining 18 expected be lower-mass protostars forming vicinity stars. find potential evidence for disruption due dynamic interactions this protocluster. spatial distribution suggests smooth overall radial density gradient without subclustering, but tentative primordial mass segregation.