Digel Cloud 2S
| Nebula | |
|---|---|
| Star-forming region | |
.jpg) Digel Cloud 2S imaged by James Webb Space Telescope | |
| Observation data: J2000.0 epoch | |
| Right ascension | 02h 48m 28.45s[1] |
| Declination | +58° 23′ 29.72″[1] |
| Distance | 40,000[1] ly |
| Constellation | Perseus |
| Designations | Digel Cloud 2S, [YKT2006b] Cloud2-S[2] |
Digel Cloud 2S is a star-forming region within the molecular cloud complex known as Digel Cloud 2, located in the Extreme Outer Galaxy region of the Milky Way. This region lies more than 58,000 light-years from the Galactic Center, placing it in one of the most distant and metal-poor parts of our galaxy.[3][1][4][5]
Observation
[edit]The Digel Clouds (1A, 1B, 2N & 2S) were first identified in molecular surveys in the 1990s, with subsequent studies confirming star formation activity in the Extreme Outer Galaxy. Detailed infrared imaging of Digel Cloud 2S came from NASA's James Webb Space Telescope (JWST) in 2024 by a team led by astronomers including Natsuko Izumi used JWST's Near-Infrared Camera (NIRCam) and Mid-Infrared Instrument (MIRI)[6] to capture near and midinfrared light, revealing unprecedented detail invisible to optical telescopes.[7][8]
Characteristics
[edit]Digel Cloud 2S has 66 cluster members with a sub-cluster located northeast of the main cluster, this sub-cluster was identified to have 10 YSOs.[9] The members of Digel Cloud 2S peak at a magnitude of 6.1 mag, while the field stars peak at a magnitude of 2.2 mag. The average (H – K)⁰ of Digel Cloud 2S is 0.49 mag, while the field stars is 0.12 mag. The spatial distribution of the stars indicates a mass of 46 M☉ and an estimated age of 1 Myr. The core of Digel Cloud 2S appears to be single, which resulted in an Mgas value of 310 M☉ with radius of 1.7 pc in FWHM. The Mstars value radius is ~0.6 pc,[5] this is because of a 5% increase of 0.017 M☉.[10]
References
[edit]- 1 2 3 4 "Digel Cloud 2S - NASA Science". 2024-09-12. Retrieved 2026-01-11.
- ↑ "[YKT2006b] Cloud2-S". simbad.cds.unistra.fr. Retrieved 2025-12-19.
- ↑ "NASA's Webb Peers into the Extreme Outer Galaxy - NASA Science". 2024-09-12. Retrieved 2026-01-18.
- ↑ Robert Lea (2024-09-16). "James Webb Telescope goes 'extreme' and spots baby stars at the edge of the Milky Way (image)". Space. Retrieved 2026-01-11.
- 1 2 Yasui, Chikako; Kobayashi, Naoto; Tokunaga, Alan T.; Terada, Hiroshi; Saito, Masao (March 2008). "Star Formation in the Extreme Outer Galaxy: Digel Cloud 2 Clusters". The Astrophysical Journal. 675 (1): 443–453. arXiv:0711.0257. Bibcode:2008ApJ...675..443Y. doi:10.1086/524356. ISSN 0004-637X.
- ↑ Izumi, Natsuko; Kobayashi, Naoto; Yasui, Chikako; Tokunaga, Alan T.; Saito, Masao; Hamano, Satoshi (2014-10-14). "Discovery of Star Formation in the Extreme Outer Galaxy Possibly Induced by a High-Velocity Cloud Impact". The Astrophysical Journal. 795 (1): 66. arXiv:1411.7290. Bibcode:2014ApJ...795...66I. doi:10.1088/0004-637X/795/1/66. ISSN 1538-4357.
- ↑ Harris, Richard (2024-12-27). "Digel Cloud 2S examined by NASAs JWST". ScopeTrader. Retrieved 2026-01-18.
- ↑ "Webb peers into the Extreme Outer Galaxy". www.esa.int. Retrieved 2026-01-18.
- ↑ Kobayashi, N.; Yasui, C.; Tokunaga, A. T.; Saito, M. (2008). "Star Formation in the Most Distant Molecular Cloud in the Extreme Outer Galaxy: A Laboratory of Star Formation in an Early Epoch of the Galaxy's Formation". The Astrophysical Journal. 683 (1): 178. doi:10.1086/588421.
- ↑ Lada, Charles J.; Lada, Elizabeth A. (2003). "Embedded Clusters in Molecular Clouds". Astronomy and Astrophysics. 41: 57–115. Bibcode:2003ARA&A..41...57L. doi:10.1146/annurev.astro.41.011802.094844.
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