التفاصيل البيبلوغرافية
| العنوان: |
FAUST II. Discovery of a Secondary Outflow in IRAS 15398-3359: Variability in Outflow Direction during the Earliest Stage of Star Formation? |
| المؤلفون: |
Okoda, Yuki, Oya, Yoko, Francis, Logan, Johnstone, Doug, Inutsuka, Shu-ichiro, Ceccarelli, Cecilia, Codella, Claudio, Chandler, Claire, Sakai, Nami, Aikawa, Yuri, Alves, Felipe, Balucani, Nadia, Bianchi, Eleonora, Bouvier, Mathilde, Caselli, Paola, Caux, Emmanuel, Charnley, Steven, Choudhury, Spandan, De Simone, Marta, Dulieu, Francois, Durán, Aurora, Evans, Lucy, Favre, Cécile, Fedele, Davide, Feng, Siyi, Fontani, Francesco, Hama, Tetsuya, Hanawa, Tomoyuki, Herbst, Eric, Hirota, Tomoya, Imai, Muneaki, Isella, Andrea, Jímenez-Serra, Izaskun, Kahane, Claudine, Lefloch, Bertrand, Loinard, Laurent, López-Sepulcre, Ana, Maud, Luke T., Maureira, Maria Jose, Menard, Francois, Mercimek, Seyma, Miotello, Anna, Moellenbrock, George, Mori, Shoji, Murillo, Nadia M., Nakatani, Riouhei, Nomura, Hideko, Oba, Yasuhiro, O'Donoghue, Ross, Ohashi, Satoshi, Ospina-Zamudio, Juan, Pineda, Jaime, Podio, Linda, Rimola, Albert, Sakai, Takeshi, Cox, Dominique Segura, Shirley, Yancy, Svoboda, Brian, Taquet, Vianney, Testi, Leonardo, Vastel, Charlotte, Viti, Serena, Watanabe, Naoki, Watanabe, Yoshimasa, Witzel, Arezu, Xue, Ci, Zhang, Yichen, Zhao, Bo, Yamamoto, Satoshi |
| سنة النشر: |
2021 |
| المجموعة: |
Astrophysics |
| مصطلحات موضوعية: |
Astrophysics - Solar and Stellar Astrophysics, Astrophysics - Astrophysics of Galaxies |
| الوصف: |
We have observed the very low-mass Class 0 protostar IRAS 15398-3359 at scales ranging from 50 au to 1800 au, as part of the ALMA Large Program FAUST. We uncover a linear feature, visible in H2CO, SO, and C18O line emission, which extends from the source along a direction almost perpendicular to the known active outflow. Molecular line emission from H2CO, SO, SiO, and CH3OH further reveals an arc-like structure connected to the outer end of the linear feature and separated from the protostar, IRAS 15398-3359, by 1200 au. The arc-like structure is blue-shifted with respect to the systemic velocity. A velocity gradient of 1.2 km/s over 1200 au along the linear feature seen in the H2CO emission connects the protostar and the arc-like structure kinematically. SO, SiO, and CH3OH are known to trace shocks, and we interpret the arc-like structure as a relic shock region produced by an outflow previously launched by IRAS 15398-3359. The velocity gradient along the linear structure can be explained as relic outflow motion. The origins of the newly observed arc-like structure and extended linear feature are discussed in relation to turbulent motions within the protostellar core and episodic accretion events during the earliest stage of protostellar evolution. |
| نوع الوثيقة: |
Working Paper |
| DOI: |
10.3847/1538-4357/abddb1 |
| URL الوصول: |
http://arxiv.org/abs/2101.07404 |
| رقم الانضمام: |
edsarx.2101.07404 |
| قاعدة البيانات: |
arXiv |