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Follow-Up Observations Toward Planck Cold Clumps with Ground-Based Radio Telescopes

Kim, Kee-Tae; Lee, Jeong-Eun; Li, Di +26 more

The physical and chemical properties of prestellar cores, especially massive ones, are still far from being well understood due to the lack of a large sample. The low dust temperature ($<$14 K) of Planck cold clumps makes them promising candidates for prestellar objects or for sources at the very initial stages of protostellar collapse. We have…

Quantifying Dark Gas

Heiles, Carl; Li, Di; Xu, Duo +2 more

A growing body of evidence has been supporting the existence of so-called "dark molecular gas" (DMG), which is invisible in the most common tracer of molecular gas, i.e., CO rotational emission. DMG is believed to be the main gas component of the intermediate extinction region between A$\rm_v$$\sim$0.05-2, roughly corresponding to the self-shieldi…

Identification of Luminous White Dwarf Candidates in the Globular Clusters M13 and M22 Using HST Acs Photometric Data

CHO, DONG-HWAN; YOON, TAE SEOG; LEE, SANG-GAK +1 more