Draft:GGD 12-15
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| Molecular cloud | |
|---|---|
| Observation data: J2000.0 epoch | |
| Right ascension | 06h 10m 52.10s[1] |
| Declination | −06° 12′ 47.0″[1] |
| Distance | ~3,260 ly |
| Constellation | Monoceros |
| Designations | [BDB2003] G213.88-11.83, [C2000b] 13, [KC2019] Theia 130, [KPS2012] MWSC 0779, IRAS 06084-0611, NGC 2183 Cluster[1] |
GGD 12-15 is an active star-forming region, star cluster, and molecular cloud of dust and gas approximately 3,260 light-years (ly) away within the Monoceros R2 Molecular Cloud Complex. GGD 12-15 was discovered in 1978 by A. Gyulbudaghian, Yu. Glushkov, and E. Denisyuk while looking for Herbig–Haro objects using data from the Palomar Sky Survey.[2]
Structure
[edit]GGD 12-15 star-forming complex consists of 4 smaller regions designated as GGD 12, 13, 14, and 15, the complex is deeply embedded within the Monoceros R2 Molecular Cloud Complex.[2] Notable structures within the complex include a bow shock of gas flowing out of the central star in the east, a extended emission region exhibiting weak filamentary structures in the south, and a dense cluster region with massive disk-bearing YSOs and T Tauri stars.[3]
Star Formation
[edit]This dense cluster region contains two prominent stars; a massive B-type YSO and a Herbig Be star. The dense cluster has a overall median age of ~4 Myr while the massive YSO and the compact cometary H II region are young and have median ages of ~1 Myr.[3] Located in GGD 14, the core of the complex, the compact cometary H II region designated as G213.880-11.837 has been excited by a B0.5 zero-age main sequence (ZAMS) star and is currently expanding, while another object designated VLA 7 is the powering source of the molecular outflow that extends ~6 arcminutes from southeast to northwest. The molecular outflow is covering a molecular clump created VLA 7.[4][5] The surrounding molecular outflow and H2 emission knots may also have been produced by the B0.5 ZAMS star. star-forming activity in these molecular clouds is proven by the detection of 76 infrared point sources and 5 protostars.[6] Observations of the CO¹⁸O emission line reveals that the molecular clump extends over ~2 pc and has a mass of 2850 M☉. The molecular outflow covers this clump through its blueshifted and redshifted lobes, these lobes have masses of 11.7 M☉ and 10.6 M☉ respectively.[7] A study found that the dense cluster region has about 100 disk-bearing YSOs with half of them being observed to exhibit variable star properties, another study found 90 X-ray sources with infrared sources, 30 of the X-ray sources were previously known and 39 possible X-ray sources.[8]
References
[edit]- 1 2 3 "NAME GGD 12-15". Simbad.cds.unistra.fr.
- 1 2 Gyulbudaghian, A. L.; Glushkov, Yu. I.; Denisyuk, E. K. (September 1978). "New Herbig–Haro objects". The Astrophysical Journal. 224: L137–L138. Bibcode:1978ApJ...224L.137G. doi:10.1086/182777.
- 1 2 Masskant, K. M.; Bik, A.; Waters, L. B. F. M.; Kaper, L.; Henning, Th.; Puga, E.; Horrobin, M.; Kainulainen, J. (November 2018). "Sequential star formation in IRAS 06084-0611 (GGD 12-15)". Astronomy and Astrophysics. 531. doi:10.1051/0004-6361/201116743.
- ↑ Yomez, Yeymi; Lebrón, Mayra; Rodriguez, Luis; Garay, G. (August 1998). "A Photodissociated Region Associated with the Compact HiiRegion near GGD 12–15". The Astrophysical Journal. 503 (1): 297–306. doi:10.1086/305960.
- ↑ Gómez, Y.; Rodríguez, L. F.; Garay, G. (June 2002). "The Nature of the Cluster of Radio Sources in GGD 14". The Astrophysical Journal. 571 (2): 901–905. Bibcode:2002ApJ...571..901G. doi:10.1086/340067.
- ↑ Min, Fang; Yong-Giang, Yao (July 2004). "Near infrared observations of the star formation region GGD12-15". Chinese Astronomy and Astrophysics. 28 (3): 308–322. Bibcode:2004ChA&A..28..308F. doi:10.1016/j.chinastron.2004.07.006.
- ↑ Shimoikura, Tomomi; Dobashi, Kazuhito; Hirano, Naomi; Nakamura, Fumitaka; Hirota, Tomoya; Matsumoto, Tomoaki; Taniguchi, Kotomi; Shimajiri, Yoshito (March 2022). "Cluster Formation in GGD 12-15: Infall Motion with Rotation of the Natal Clump". The Astrophysical Journal. 928 (76): 1–16. doi:10.3847/1538.
- ↑ Wolk, Scott J.; Moritz Günther, H.; Poppenhaeger, Katja; Cody, A. M.; Rebull, L. M.; Forbrich, J.; Gutermuth, R. A. (2015). "YSOVAR: Mid-infr AR: Mid-infrared Variability Among Y ariability Among YSOs in the Star SOs in the Star Formation Region GGD12-15". The Astronomical Journal. 150 (5): 145. doi:10.1088/0004-6256/150/5/145.