Visit ASIAA Homepage Registration Deadline: November 27, 2019 (Taiwan Time)
East-Asian ALMA Science Workshop 2019
February 19(Wed)-21(Fri), 2020
ASIAA, Taipei, Taiwan

Poster Presentation

Prestellar cores and fragmentation in the Orion molecular clouds

Author(s): Dipen Sahu, Sheng-Yuan Liu, Naomi Hirano, Chin-Fei Lee, Somnath Dutta, Anthony Moraghan (ASIAA), Shih-Ying Hsu, Kai-Syun Jhan (ASIAA, NTU), Tie Liu (SHAO), Gwanjeong Kim(KASI)

Presenter: Dipen Sahu (ASIAA)

Recently we have observed 72 cores towards the Orion molecular cloud using ALMA band 6. Among these cores, we have identified 16 starless cores using dust continuum emission together with molecular line emission, N2H+, and DCO+. Among the starless core samples, five cores are comparatively denser and quite similar to the well known prestellar core L1544. The hydrogen column density of these cores are ~10^7 cm^-3. These kinds of prestellar cores may collapse to form single or multiple systems depending on the physical conditions. In the past, several observational attempts have been made to detect the central regions and possible substructures of dense starless cores, but none of them acquired any positive results to validate the theoretical estimations. For the first time, we have found substructures in prestellar cores and detected the central dense region of prestellar cores, thanks to the higher resolution achieved by the ALMA observations.

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