Star formation in IRDC G31.97+0.07

Abstract

We utilize multiple-waveband continuum and molecular-line data of CO isotopes, to study the dynamical structure and physical properties of the IRDC G31.97+0.07. We derive the dust temperature and H${}_2$ column density maps of the whole structure by SED fitting. The total mass is about $2.5\times 10^5{M}_{\odot }$ for the whole filamentary structure and about $7.8\times 10^4{M}_{\odot }$ for the IRDC. Column density PDFs produced from the column density map are generally in the power-law form suggesting that this part is mainly gravity-dominant. The flatter slope of the PDF of the IRDC implies that it might be compressed by an adjacent, larger \HII region. There are 27 clumps identified from the 850\,\micron \ continuum located in this filamentary structure. Based on the average spacing of the fragments in the IRDC, we estimate the age of the IRDC. The age is about $6.4$Myr assuming inclination angle $i=30^{\circ }$. For 18 clumps with relatively strong CO and ${}^{13}$CO (3-2) emission, we study their line profiles and stabilities. We find 5 clumps with blue profiles which indicate gas infall motion and 2 clumps with red profiles which indicate outflows or expansion. Only one clump has ${\alpha }_{\mathrm{vir}}>2$, suggesting that most clumps are gravitationally bound and tend to collapse. In the Mass-$R_{\mathrm{eq}}$ diagram, 23 of 27 clumps are above the threshold for high-mass star formation, suggesting that this region can be a good place for studying high-mass star-forming.

arXiv comment19 pages, 13 figures

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