Interactions between forming stars and dense gas in the small low-mass cluster Cederblad 110

E. F. Ladd, T. Wong, T. L. Bourke, K. L. Thompson

Research output: Contribution to journalArticlepeer-review

Abstract

We present observations of dense gas and outflow activity in the Cederblad 110 region of the ChamaeleonI dark cloud complex. The region contains nine forming low-mass stars in evolutionary stages ranging from Class0 to ClassII/III crowded into a 0.2pc region with high surface density (Σ YSO∼ 150pc-2). The analysis of our N2H + (J = 1→0) maps indicates the presence of 13±3 solar masses of dense (n∼105cm-3) gas in this region, much of which is unstable against gravitational collapse. The most unstable material is located near the Class0 source MMS-1, which is almost certainly actively accreting material from its dense core. Smaller column densities of more stable dense gas are found toward the region's ClassI sources, IRS 4, 11, and 6. Little or no dense gas is colocated with the ClassII and III sources in the region. The outflow from IRS 4 is interacting with the dense core associated with MMS-1. The molecular component of the outflow, measured in the (J = 1→0) line of 12CO, appears to be deflected by the densest part of the core, after which it appears to plow through some of the lower column density portions of the core. The working surface between the head of the outflow lobe and the dense core material can be seen in the enhanced velocity dispersion of the dense gas. IRS 2, the ClassIII source that produces the optical reflection nebula that gives the Cederblad 110 region its name, may also be influencing the dense gas in the region. A dust temperature gradient across the MMS-1 dense core is consistent with warming from IRS 2, and a sharp gradient in dense gas column density may be caused by winds from this source. Taken together, our data indicate that this region has been producing several young stars in the recent past, and that sources which began forming first are interacting with the remaining dense gas in the region, thereby influencing current and future star formation activity.

Original languageEnglish (US)
Article number108
JournalAstrophysical Journal
Volume743
Issue number2
DOIs
StatePublished - Dec 20 2011

Keywords

  • ISM: individual objects: Ced 110
  • ISM: individual objects: Chamaeleon I
  • ISM: jets and outflows
  • ISM: kinematics and dynamics

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

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