Ammonia Observations of Planck Cold Cores
Dilda Berdikhan., Jarken Esimbek., Christian Henkel., Jianjun Zhou.,, Xindi Tang., Tie Liu., Gang Wu., Dalei Li., Yuxin He., Toktarkhan Komesh.,, Kadirya Tursun., Dongdong Zhou., Ernar Imanaly., Qaynar Jandaolet

TL;DR
This study used NH3 observations of 672 Planck cold cores to analyze their physical properties, star formation activity, and internal motions, revealing most are likely starless with cold, quiescent dense gas.
Contribution
First large-scale NH3 survey of Planck cold cores providing detailed physical and kinematic properties, highlighting differences from star-forming regions.
Findings
37% detection rate of NH3 in cores
Most cores are likely starless based on IR associations
Supersonic non-thermal motions dominate the dense gas
Abstract
Single-pointing observations of NH (1,1) and (2,2) were conducted towards 672 Planck Early Release Cold Cores (ECCs) using the Nanshan 26-m radio telescope. Out of these sources, a detection rate of 37% (249 cores) was achieved, with NH(1,1) hyperfine structure detected in 187 and NH(2,2) emission lines detected in 76 cores. The detection rate of NH3 is positively correlated with the continuum emission fluxes at a frequency of 857 GHz. Among the observed 672 cores, ~22% have associated stellar and IR objects within the beam size (~2). This suggests that most of the cores in our sample may be starless. The kinetic temperatures of the cores range from 8.9 to 20.7 K, with an average of 12.3 K, indicating a coupling between gas and dust temperatures. The ammonia column densities range from 0.36 to 6.07 cm, with a median value of 2.04…
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Taxonomy
TopicsAstrophysics and Star Formation Studies · Stellar, planetary, and galactic studies · Astronomy and Astrophysical Research
