Kinematic study of molecular gas in cometary globule - LBN 437

Title

Kinematic study of molecular gas in cometary globule - LBN 437

Creator

Aardra, S.; Issac, Namitha; Soam, Archana; Mathew, Blesson; Lee, Chang Won

Description

Bright-rimmed, cometary-shaped star-forming globules, associated with H ii regions, are remnants of compressed molecular shells exposed to ultraviolet radiation from central OB-type stars. The interplay between dense molecular gas and ionizing radiation, analysed through gas kinematics, provides significant insights into the nature and dynamic evolution of these globules. This study presents the results of a kinematic analysis of the cometary globule, Lynds' Bright Nebula (LBN) 437, focusing on the first rotational transition of CO and CO molecular lines observed using the Taeduk Radio Astronomy Observatory. The averaged CO spectrum shows a slightly skewed profile, suggesting the possibility of a contracting cloud. The molecular gas kinematics reveals signatures of infalling gas in the cometary head of LBN 437, indicating the initial stages of star formation. The mean infall velocity and mass infall rate towards the cometary head of LBN 437 are 0.25 km s and 5.08 10 M yr, respectively, which align well with the previous studies on intermediate or high-mass star formation. 2025 The Author(s).

Source

Monthly Notices of the Royal Astronomical Society;Volume;540;Issue;3;pp.2279-2288

Date

01-01-2025

Publisher

Oxford University Press

Subject

H ii regions; ISM: kinematics and dynamics; ISM: molecules; stars: formation - ISM: clouds

Coverage

Aardra S., Department of Physics and Electronics, CHRIST (Deemed to Be University), Bangalore, 560029, India, Indian Institute of Astrophysics (IIA), Koramangala, Bangalore, 560034, India; Issac N., Indian Institute of Astrophysics (IIA), Koramangala, Bangalore, 560034, India, Shanghai Astronomical Observatory, Chinese Academy of Sciences, 80 Nandan Road, Shanghai, 200030, China; Soam A., Indian Institute of Astrophysics (IIA), Koramangala, Bangalore, 560034, India; Mathew B., Department of Physics and Electronics, CHRIST (Deemed to Be University), Bangalore, 560029, India; Lee C.W., Korea Astronomy and Space Science Institute (KASI), 776 Daedeokdae-ro, Yuseong-gu, Daejeon, 305-348, South Korea, University of Science & Technology, 176 Gajeong-dong, Yuseong-gu, Daejeon, 34113, South Korea

Rights

All Open Access; Gold Open Access

Relation

ISSN: 358711; CODEN: MNRAA

Format

online

Language

English

Type

Article

Identifier

https://doi.org/10.1093/mnras/staf822

https://www.scopus.com/pages/publications/105008371881?origin=resultslist