Magnetic Fields in Massive Star-forming Regions (MagMaR): Unveiling an Hourglass Magnetic Field in G333.46–0.16 Using ALMA

• Autores: Saha, Piyali; Sanhueza, Patricio; Padovani, Marco; Girart, Josep M.; Cortés, Paulo C.; Morii, Kaho; Liu, Junhao; Sánchez Monge, Á.; Galli, Daniele; Basu, Shantanu; Koch, Patrick M.; Beltrán, Maria T.; Li, Shanghuo; Beuther, Henrik; Stephens, Ian; Nakamura, Fumitaka; Zhang, Qizhou; Jiao, Wenyu; Fernandez Lopez, Manuel; Hwang, Jihye; Chung, Eun Jung; Pattle, Kate; Zapata Gonzalez, Luis Alberto; Xu, Fengwei; Olguin, Fernando A.; Kang, Ji hyun; Karoly, Janik; Law, Chi Yan; Wang, Jia Wei; Csengeri, Timea; Lu, Xing; Cheng, Yu; Kim, Jongsoo; Choudhury, Spandan; Chen, Huei Ru Vivien; Hull, Charles L. H.
• Año de publicación: 2024
• Idioma: inglés
• Tipo de recurso: artículo
• Materia: Polarimetry; Star formation
• Institución: Consejo Nacional de Investigaciones Científicas y Técnicas

The contribution of the magnetic field to the formation of high-mass stars is poorly understood. We report the high angular resolution (∼0.″3, 870 au) map of the magnetic field projected on the plane of the sky (B POS) toward the high-mass star-forming region G333.46‑0.16 (G333), obtained with the Atacama Large Millimeter/submillimeter Array at 1.2 mm as part of the Magnetic fields in Massive star-forming Regions survey. The B POS morphology found in this region is consistent with a canonical "hourglass" with an embedded flattened envelope in a perpendicular direction, which suggests a dynamically important field. This region is fragmented into two protostars that appear to be gravitationally bound in a stable binary system with a separation of ∼1740 au. Interestingly, by analyzing H13CO+ (J = 3–2) line emission, we find no velocity gradient over the extent of the continuum, which is consistent with a strong field. We model the B POS, obtaining a marginally supercritical mass-to-flux ratio of 1.43, suggesting an initially strongly magnetized environment. Based on the Davis–Chandrasekhar–Fermi method, the magnetic field strength toward G333 is estimated to be 5.7 mG. The absence of strong rotation and outflows toward the central region of G333 suggests strong magnetic braking, consistent with a highly magnetized environment. Our study shows that despite being a strong regulator, the magnetic energy fails to prevent the process of fragmentation, as revealed by the formation of the two protostars in the central region.
Fil: Saha, Piyali. The Graduate University for Advanced Studies; Japón
Fil: Sanhueza, Patricio. INAF. Osservatorio Astrofisico di Arcetri; Italia
Fil: Padovani, Marco. Istituto Nazionale di Astrofisica; Italia
Fil: Girart, Josep M.. Institut de Ciéncies de l’Espai; España
Fil: Cortés, Paulo C.. Joint ALMA Observatory; Chile
Fil: Morii, Kaho. The Graduate University for Advanced Studies; Japón
Fil: Liu, Junhao. The Graduate University for Advanced Studies; Japón
Fil: Sánchez Monge, Á.. Institut de Ciéncies de l’Espai; España
Fil: Galli, Daniele. Istituto Nazionale di Astrofisica; Italia
Fil: Basu, Shantanu. University Of Western Ontario; Canadá
Fil: Koch, Patrick M.. Academia Sinica; China
Fil: Beltrán, Maria T.. Istituto Nazionale di Astrofisica; Italia
Fil: Li, Shanghuo. Max Planck Institute for Radio Astronomy; Alemania
Fil: Beuther, Henrik. Max Planck Institute for Radio Astronomy; Alemania
Fil: Stephens, Ian. Worcester State University; Estados Unidos
Fil: Nakamura, Fumitaka. The Graduate University for Advanced Studies; Japón
Fil: Zhang, Qizhou. Harvard-Smithsonian Center for Astrophysics; Estados Unidos
Fil: Jiao, Wenyu. Peking University; China
Fil: Fernandez Lopez, Manuel. Provincia de Buenos Aires. Gobernación. Comisión de Investigaciones Científicas. Instituto Argentino de Radioastronomía. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata. Instituto Argentino de Radioastronomía; Argentina
Fil: Hwang, Jihye. Korea Astronomy and Space Science Institute; Corea del Sur
Fil: Chung, Eun Jung. Korea Astronomy and Space Science Institute; Corea del Sur
Fil: Pattle, Kate. University College London; Estados Unidos
Fil: Zapata Gonzalez, Luis Alberto. Universidad Nacional Autónoma de México; México
Fil: Xu, Fengwei. Peking University; China
Fil: Olguin, Fernando A.. National Tsing Hua University; China
Fil: Kang, Ji hyun. National Tsing Hua University; China
Fil: Karoly, Janik. University College London; Estados Unidos
Fil: Law, Chi Yan. Istituto Nazionale di Astrofisica; Italia
Fil: Wang, Jia Wei. National Tsing Hua University; China
Fil: Csengeri, Timea. Universite de Bordeaux; Francia
Fil: Lu, Xing. Chinese Academy of Sciences; República de China
Fil: Cheng, Yu. The Graduate University for Advanced Studies; Japón
Fil: Kim, Jongsoo. Korea Astronomy and Space Science Institute; China
Fil: Choudhury, Spandan. Korea Astronomy and Space Science Institute; China
Fil: Chen, Huei Ru Vivien. Korea Astronomy and Space Science Institute; China
Fil: Hull, Charles L. H.. The Graduate University for Advanced Studies; Japón