IRAS 16293-2422: PROPER MOTIONS, JET PRECESSION, THE HOT CORE, AND THE UNAMBIGUOUS DETECTION OF INFALL

摘要: We present high spatial resolution observations of the multiple protostellar system IRAS 16293-2422 using Submillimeter Array (SMA) at 300 GHz and Very Large (VLA) frequencies from 1.5 to 43 GHz. This source was already known be a binary with its main components, A B, separated by ~5''. The new SMA data now separate into two submillimeter continuum which we denote Aa Ab. strongest these, Aa, peaks between centimeter radio sources A1 A2, but current is insufficient distinguish whether this or centroid dust emission associated A2. Archival VLA spanning 18 yr show proper motion B 17 mas yr-1, ? Ophiuchi cloud. also find, however, significant relative excludes possibility that these are gravitationally bound unless in highly eccentric orbit observed periastron, probability low. A2 remains stationary identify it as protostar drives large-scale northeast-southwest CO outflow. shock-ionized gas traces location interaction precessing jet nearby dense gas. probably east-west outflow, indeed consistent wide opening angle flow. origin must located close may Aa. Thus, shown comprise three (proto)stellar components within 1''. Source on other hand, single, exhibits optically thick even 8 GHz, has luminosity, yet shows no sign It very young not have begun phase mass loss yet. spectrum reports first astronomical identification many lines organic molecules 310 species detected typical hot cores, mainly A. abundances second-generation species, especially sulphur-bearing molecules, significantly higher than predicted chemical models for date, suggest shocks needed explain enhancements. integrated having rotation temperatures coincide A1, highlighting key role explaining nature cores. Finally, use brightness temperature demonstrate unambiguous detection infall observing redshifted SO (77-66) absorption against disk.