Evolutionary status of dense cores in the NGC 1333 IRAS 4 star-forming region

Koumpia, E., van der Tak, F. F. S., Kwon, W., Tobin, J. J., Fuller, G. A. & Plume, R., 2016, In : Astronomy and astrophysics. 595, November 2016 , 18 p., A51.

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Context. Protostellar evolution after the formation of the protostar is becoming reasonably well characterized, but the evolution from a prestellar core to a protostar is not well known, although the first hydrostatic core (FHSC) must be a pivotal step. Aims: NGC 1333 - IRAS 4C is a potentially very young object that we can directly compare with the nearby Class 0 objects IRAS 4A and IRAS 4B. Observational constraints are provided by spectral imaging from the JCMT Spectral Legacy Survey (330-373 GHz). We present integrated intensity and velocity maps of several species, including CO, H2CO and CH3OH. CARMA observations provide additional information with which we can distinguish IRAS 4C from other evolutionary stages. Methods: We present the observational signatures of the velocity of an observed outflow, the degree of CO depletion, the deuterium fractionation of [DCO+]/[HCO+], and gas kinetic temperatures. Results: We report differences between the three sources in four aspects: a) the kinetic temperature as probed using the H2CO lines is much lower toward IRAS 4C than the other two sources; b) the line profiles of the detected species show strong outflow activity toward IRAS 4A and IRAS 4B, but not toward IRAS 4C; c) the HCN/HNC is
Original languageEnglish
Article numberA51
Number of pages18
JournalAstronomy and astrophysics
Issue numberNovember 2016
Publication statusPublished - 2016


  • ISM: abundances, ISM: kinematics and dynamics, ISM: molecules, stars: formation, stars: low-mass, stars: protostars

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