Details

Autor(en) / Beteiligte

• Komesh, Toktarkhan
• Baan, Willem
• Esimbek, Jarken
• Zhou, Jianjun
• Li, Dalei
• Wu, Gang
• He, Yuxin
• Rosli, Zulfazli
• Ibraimov, Margulan

Titel

Studies of the distinct regions due to CO selective dissociation in the Aquila molecular cloud

Ist Teil von

• Astronomy and astrophysics (Berlin), 2020-12, Vol.644, p.A46

Ort / Verlag

Heidelberg: EDP Sciences

Erscheinungsjahr

2020

Quelle

EZB Electronic Journals Library

Beschreibungen/Notizen

• Aims. We investigate the role of selective dissociation in the process of star formation by comparing the physical parameters of protostellar-prestellar cores and the selected regions with the CO isotope distributions in photo-dissociation regions. We seek to understand whether there is a better connection between the evolutionary age of star forming regions and the effect of selective dissociation Methods. We used wide-field observations of the 12 CO, 13 CO, and C 18 O ( J = 1–0) emission lines to study the ongoing star formation activity in the Aquila molecular region, and we used the 70 and 250 μ m data to describe the heating of the surrounding material and as an indicator of the evolutionary age of the core. Results. The protostellar-prestellar cores are found at locations with the highest C 18 O column densities and their increasing evolutionary age coincides with an increasing 70 μ m/250 μ m emission ratio at their location. The evolutionary age of the cores may also follow from the 13 CO versus C 18 O abundance ratio, which decreases with increasing C 18 O column densities. The original mass has been estimated for nine representative star formation regions and the original mass of the region correlates well with the integrated 70 μ m flux density. Similarly, the X 13 CO / X C 18 O ratio, which provides the dissociation rate for these regions correlates with the 70 μ m/250 μ m flux density ratio and reflects the evolutionary age of the star formation activity.