Star formation and ionized regions throughout the inner Galactic plane

Journal
Date Issued
2017
Author(s)
Palmeirim, P.
•
Zavagno, A.
•
•
VIALACTEA Team
Description
Pedro Palmeirim acknowledges support from the Fundaçao para a Ciencia e a Tecnologia of Portugal (FCT) through national funds (UID/FIS/04434/2013) and by FEDER through COMPETE2020 (POCI-01-0145-FEDER-007672) and also by the fellowship SFRH/BPD/110176/2015 funded by FCT (Portugal) and POPH/FSE (EC).
Abstract
We present a comprehensive statistical analysis of star-forming objects located in the vicinity of 1360 bubble structures throughout the inner Galactic Plane. The compilation of ∼70 000 star-forming sources, detected in both HI-GAL and GLIMPSE surveys, provided a broad overview of the different evolutionary stages of star-formation in bubbles, from prestellar objects to more evolved Young Stellar Objects (YSOs). Surface density maps reveal a clear evolutionary gradient and ∼80% more sources per unit area in the direction of the bubbles compared with the surrounding outer fields. We derived dynamic ages and clump formation efficiencies for a subsample of 182 bubbles and found that younger bubbles are typically more efficient at forming clumps. Approximately 23% of the HI-GAL clumps are located in the direction of a bubble, with 15% for prestellar clumps and 41% for protostellar clumps. We argue that the high fraction of protostellar clumps may be due to the acceleration of the star-formation process caused by the feedback of the bubbles.
Volume
88
Start page
747
Uri
Url
Issn Identifier
0037-8720
Ads BibCode
2017MmSAI..88..747P
Rights
open.access
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