Embedded cluster
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Embedded stellar clusters or simply embedded clusters (EC) are open clusters that are still surrounded in their progenitor molecular cloud.[1] They are often areas of active star formation, giving rise to stellar objects that share similar ages and compositions. Due to the dense material that surrounds the stars, they cannot be observed in visible light but are detectable using other sections of the electromagnetic spectrum, such as the near-infrared and X-rays. Often in these spectra, they may be detected as stellar enhancements above expected galactic background stellar counts.[2] Other times this technique would fail as the number of background stars would cancel out any enhancement, especially when observing near the galactic bulge.
As the sizes of stellar objects born in embedded clusters are distributed according to initial mass function which a universal ratio between low to high mass stars. Many ultra compact HII, the precursor to massive protostars, are associated with embedded clusters[3] .
Although many embedded stellar clusters are known to exist, few have specified names. Below is a list of possible embedded star clusters:
- Trapezium cluster
- Rho Ophiuchi cloud complex
- IRAS 06068+2030
- IRAS 06155+2319
- IRAS 22551+6621
- IRAS 22172+5549
- IRAS 00070+5549
References
- ^ Lada, Charles J.; Lada, Elizabeth A. (2004). "Embedded clusters in molecular clouds". Annual Review of Astronomy and Astrophysics. 41: 57–115. arXiv:astro-ph/0301540. doi:10.1146/annurev.astro.41.011802.094844.
- ^ Clerkin, James (2004). 2MASS study of candidate precursors to UCHII regions (Thesis). Universidade do Porto.
{{cite thesis}}:|access-date=requires|url=(help) - ^ Clerkin, James (2004). 2MASS study of candidate precursors to UCHII regions (Thesis). Universidade do Porto.
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