%0 Journal Article
%@ 0004-637X
%A Girart, JM
%A Estalella, R
%A Viti, S
%A Williams, DA
%A Ho, PTP
%D 2001
%F discovery:10192694
%I IOP PUBLISHING LTD
%J The Astrophysical Journal
%K Astronomy, formation, Star, Star Formation
%N 1
%P L91-L94
%T Star formation signatures in the condensation  downstream of HH80N
%U https://discovery.ucl.ac.uk/id/eprint/10192694/
%V 526
%X 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.
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