تقرير
FAUST VII. Detection of A Hot Corino in the Prototypical Warm Carbon-Chain Chemistry Source IRAS 15398-3359
| العنوان: | FAUST VII. Detection of A Hot Corino in the Prototypical Warm Carbon-Chain Chemistry Source IRAS 15398-3359 |
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| المؤلفون: | Okoda, Yuki, Oya, Yoko, Francis, Logan, Johnstone, Doug, Ceccarelli, Cecilia, Codella, Claudio, Chandler, Claire J., Sakai, Nami, Aikawa, Yuri, Alves, Felipe O., Herbst, Eric, Maureira, María José, Bouvier, Mathilde, Caselli, Paola, Choudhury, Spandan, De Simone, Marta, Jímenez-Serra, Izaskun, Pineda, Jaime, Yamamoto, Satoshi |
| سنة النشر: | 2023 |
| المجموعة: | Astrophysics |
| مصطلحات موضوعية: | Astrophysics - Solar and Stellar Astrophysics, Astrophysics - Astrophysics of Galaxies |
| الوصف: | We have observed the low-mass protostellar source, IRAS 15398$-$3359, at a resolution of 0.$''$2-0.$''$3, as part of the Atacama Large Millimeter/Submillimeter Array Large Program FAUST, to examine the presence of a hot corino in the vicinity of the protostar. We detect nine CH$_3$OH lines including the high excitation lines with upper state energies up to 500 K. The CH$_3$OH rotational temperature and the column density are derived to be 119$^{+20}_{-26}$ K and 3.2$^{+2.5}_{-1.0}\times$10$^{18}$ cm$^{-2}$, respectively. The beam filling factor is derived to be 0.018$^{+0.005}_{-0.003}$, indicating that the emitting region of CH$_3$OH is much smaller than the synthesized beam size and is not resolved. The emitting region of three high excitation lines, 18$_{3,15}-18_{2,16}$, A ($E_u=$447 K), 19$_{3,16}-19_{2,17}$, A ($E_u=$491 K), and 20$_{3,17}-20_{2,18}$, A ($E_u=$537 K), is located within the 50 au area around the protostar, and seems to have a slight extension toward the northwest. Toward the continuum peak, we also detect one emission line from CH$_2$DOH and two features of multiple CH$_3$OCHO lines. These results, in combination with previous reports, indicate that IRAS 15398$-$3359 is a source with hybrid properties showing both hot corino chemistry rich in complex organic molecules on small scales $\sim$10 au) and warm carbon-chain chemistry (WCCC) rich in carbon-chain species on large scales ($\sim$100-1000 au). A possible implication of the small emitting region is further discussed in relation to the origin of the hot corino activity. Comment: 20pages, 3figures |
| نوع الوثيقة: | Working Paper |
| DOI: | 10.3847/1538-4357/acc1e5 |
| الوصول الحر: | http://arxiv.org/abs/2303.03564Test |
| رقم الانضمام: | edsarx.2303.03564 |
| قاعدة البيانات: | arXiv |
| DOI: | 10.3847/1538-4357/acc1e5 |
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