English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Plus monthly

Global: Zendy Tools annual

Global: Zendy Tools monthly

Global: Zendy Free Plan

Aims: Our goal is to set constraints on the evolutionary state of the densecore Cha-MMS1 in the Chamaeleon I molecular cloud. Methods: We analyzemolecular line observations carried out with the new submillimeter telescopeAPEX. We look for outflow signatures around the dense core and probe itschemical structure, which we compare to predictions of models of gas-phasechemistry. We also use the public database of the Spitzer Space Telescope (SST)to compare Cha-MMS1 with the two Class 0 protostars IRAM 04191 and L1521F,which are at the same distance. Results: We measure a large deuteriumfractionation for N2H+ (11 +/- 3 %), intermediate between the prestellar coreL1544 and the very young Class 0 protostar L1521F. It is larger than for HCO+(2.5 +/- 0.9 %), which is probably the result of depletion removing HCO+ fromthe high-density inner region. Our CO(3-2) map reveals the presence of abipolar outflow driven by the Class I protostar Ced 110 IRS 4 but we do notfind evidence for an outflow powered by Cha-MMS1. We also report the detectionof Cha-MMS1 at 24, 70 and 160 microns by the instrument MIPS of the SST, at alevel nearly an order of magnitude lower than IRAM 04191 and L1521F.Conclusions: Cha-MMS1 appears to have already formed a compact object, eitherthe first hydrostatic core at the very end of the prestellar phase, or anextremely young protostar that has not yet powered any outflow, at the verybeginning of the Class 0 accretion phase.Comment: Accepted by Astronomy & Astrophysics as a letter, to appear in the  special issue on the APEX first result

The evolutionary state of the southern dense core Chamaeleon-MMS1