Multi-wavelength inspection of the pre-starforming Dark Globule, DC 314.8-5.1: in search of cosmic-ray ionization
August 03, 2023
We present an analysis of the multi-wavelength observations of the dark globule, DC 314.8-5.1, using the optical survey Gaia, the near-infrared survey 2MASS, mid-infrared survey WISE along with dedicated imaging with the Spitzer Space Telescope, and finally X-ray data obtained with the Swift-XRT telescope. This cloud has a coincidental association with a B-type field star, which illuminates a reflection nebula within the cloud, resulting in infrared emission from the dust grains. The analysis of the infrared spectroscopy showed divergent physical conditions in the quiescent cloud DC 314.8-5.1 compared to molecular clouds with active star formation, which may indicate that cosmic rays were involved in the ionization of the system. Furthermore, our detailed analysis of the gathered multi-wavelength data confirms a very young, "pre-stellar core" evolutionary stage of the cloud, supporting the claim that the high ionization level may be the result of cosmic-ray interactions. All in all, our analysis indicates that DC 314.8-5.1 constitutes a compact reservoir of cold dust and gas, providing a truly unique insight into a primordial form of the interstellar medium.
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