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Star formation in the filament of S254-S258 OB complex: a cluster in the process of making
- Source :
- Astronomy and Astrophysics-A&A, Astronomy and Astrophysics-A&A, EDP Sciences, 2015, http://arxiv.org/abs/1503.09037. ⟨10.1051/0004-6361/201322787⟩, Astronomy and Astrophysics-A&A, 2015, http://arxiv.org/abs/1503.09037. ⟨10.1051/0004-6361/201322787⟩
- Publication Year :
- 2015
- Publisher :
- HAL CCSD, 2015.
-
Abstract
- Infrared Dark Clouds are ideal laboratories to study the initial processes of high-mass star and star cluster formation. We investigated star formation activity of an unexplored filamentary dark cloud (~5.7pc x 1.9pc), which itself is part of a large filament (~20pc) located in the S254-S258 OB complex at a distance of 2.5kpc. Using MIPS Spitzer 24 micron data, we uncover 49 sources with SNR greater than 5. We identified 45 sources as candidate YSOs of Class I, Flat-spectrum & Class II nature. Additional 17 candidate YSOs (9 Class I & 8 Class II) are also identified using JHK and WISE photometry. We find that the protostar to Class II sources ratio (~2) and the protostar fraction (~70%) of the region are high. When the protostar fraction compared to other young clusters, it suggests that the star formation in the dark cloud was possibly started only 1 Myr ago. Combining the NIR photometry of the YSO candidates with the theoretical evolutionary models, we infer that most of the candidate YSOs formed in the dark cloud are low-mass (<br />14 pages, 9 figures, Accepted by Astronomy & Astrophysics
- Subjects :
- filament
Astrophysics of Galaxies (astro-ph.GA)
infrared
individual: S254-S258 complex
FOS: Physical sciences
Astrophysics::Solar and Stellar Astrophysics
Astrophysics::Cosmology and Extragalactic Astrophysics
[PHYS.ASTR]Physics [physics]/Astrophysics [astro-ph]
Astrophysics - Astrophysics of Galaxies
young stellar objects
Astrophysics::Galaxy Astrophysics
star formation
dark cloud
Subjects
Details
- Language :
- English
- ISSN :
- 00046361
- Database :
- OpenAIRE
- Journal :
- Astronomy and Astrophysics-A&A, Astronomy and Astrophysics-A&A, EDP Sciences, 2015, http://arxiv.org/abs/1503.09037. ⟨10.1051/0004-6361/201322787⟩, Astronomy and Astrophysics-A&A, 2015, http://arxiv.org/abs/1503.09037. ⟨10.1051/0004-6361/201322787⟩
- Accession number :
- edsair.doi.dedup.....d456adaabf3884b390e0bc085edb6c13