Star Formation Signatures in the Condensation Downstream of HH 80N

Abstract

HH80N is one of the Herbig-Haro objects that have associated quiescent dense clumps. We report CO and CS BIMA observations that reveal star formation within the HH80N dense clump. The CO emission reveals clearly a bipolar molecular outflow centered on the dense clump. The CS emission traces a ring-like structure of radius ~0.24 pc. The CS kinematics shows that the ring is collapsing with an infall speed of ~0.6 km/s. The required mass to produce the collapse is in agreement with previous ammonia observations of the 20 solar mass core, which is embedded within the CS structure. However, we cannot discard that the ring structure is expanding driven by protostellar winds, if the CS abundance if unusually high and the CO momentum rate is much higher than that measured, due to inclination and optical depth effects. The properties of the molecular outflow and of the dense core suggest that it harbors a Class 0 object. There are also signatures of interaction of the HH 80/81/80N outflow with the dense gas. In particular it is possible that the HH 80/81/80N outflow has triggered or at least speed up the star formation in this region.

arXiv comment6 pages, 2 figures, to be published in the ApJ Letters

References in corpus (4)

• A High Resolution Study of the Slowly Contracting, Starless Core L1544
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Cited by in corpus (14)

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• VLA and BIMA observations toward the exciting source of the massive HH~80-81 outflow
• Millimeter and submillimeter high angular resolution interferometric observations: dust in the heart of IRAS 18162-2048
• Centimeter continuum observations of the northern head of the HH 80/81/80N jet: revising the actual dimensions of a parsec scale jet
• The L723 low mass star forming protostellar system: resolving a double core
• The Dense Molecular Cores in the IRAS 21391+5802 region
• A multi-wavelength study of the star-forming core ahead of HH 80N
• The molecular emission of the irradiated star forming core ahead of HH 80N
• Interferometric observations of nitrogen-bearing molecular species in the star-forming core ahead of HH 80N
• Very Large Array Ammonia Observations of the HH 111/HH 121 Protostellar System: a Detection of a New Source With a Peculiar Chemistry
• Imaging of HH80-81 jet in the NIR shock tracers H${}_2$ and [Fe II]
• Modeling of thermal and non-thermal radio emission from HH80-81 jet
• Diverse stages of star formation in the IRAS 18162-2048 region. Emergence of UV Feedback