A multi-wavelength observation and investigation of six infrared dark clouds
作者： Chuan-Peng Zhang , Guang-Xing Li , Jian-Jun Zhou , Jun-Jie Wang , Jing-Hua Yuan
DOI: 10.1051/0004-6361/201629771
关键词:
摘要: Context. Infrared dark clouds (IRDCs) are ubiquitous in the Milky Way, yet they play a crucial role breeding newly-formed stars. Aims. With aim of further understanding dynamics, chemistry, and evolution IRDCs, we carried out multi-wavelength observations on small sample. Methods. We performed new with IRAM 30 m CSO 10.4 telescopes, tracers ${\rm HCO^+}$, HCN, N_2H^+}$, C^{18}O}$, DCO$^+$, SiO, DCN toward six IRDCs G031.97+00.07, G033.69-00.01, G034.43+00.24, G035.39-00.33, G038.95-00.47, G053.11+00.05. Results. investigated 44 cores including 37 reported previous work seven newly-identified cores. Toward dense cores, detected 6 5 lines. Using pixel-by-pixel spectral energy distribution (SED) fits $\textit{Herschel}$ 70 to 500 $\mu$m, obtained dust temperature column density distributions IRDCs. found that N_2H^+}$ emission has strong correlation distributions, while C^{18}O}$ showed weakest correlation. It is suggested indeed good tracer very conditions, but an unreliable one, as it relatively low critical vulnerable freezing-out onto surface cold grains. The dynamics within active, infall, outflow, collapse; spectra abundant especially deuterium species. Conclusions. observe many blueshifted redshifted profiles, respectively, HCO^+}$ same core. This case can be well explained by model "envelope expansion core collapse (EECC)".
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