인문학
사회과학
자연과학
공학
의약학
농수해양학
예술체육학
복합학
DBpia AI
AI 에이전트
AI 아이디어
AI 리더
AI 뷰어
Citeasy
크롬 서지관리 다운로드
지원사업
학술연구/단체지원/교육 등 연구자 활동을 지속하도록 DBpia가 지원하고 있어요.
커뮤니티
연구자들이 자신의 연구와 전문성을 널리 알리고, 새로운 협력의 기회를 만들 수 있는 네트워킹 공간이에요.
초록·키워드
Context. Compared to Class 0 protostars, the higher densities and lower temperatures of the disk midplanes of Class I young stellar objects (YSOs) limit the detectability of complex organic molecules (COMs). The elevated luminosities of eruptive YSOs increase disk temperatures causing frozen molecules to sublimate, thus making them easier to detect. Aims. Our aim is to investigate the chemical composition of four FUor-like Class I YSOs (L1551 IRS 5, Haro 5a IRS, V346 Nor, and OO Ser) and to compare their abundances of COMs with other YSOs in the literature. Methods. We searched for COMs line emission in ALMA Band 6 observations. We used the CASSIS software to determine their column densities ( N ) and excitation temperatures ( T ex ) assuming local thermodynamical equilibrium. Results. We detected 249 transitions from 12 COMs. In L1551 IRS 5 we identified CH3OH, 13 CH 3 OH, CH 3 18 OH, CH 2 DOH, CH 3 CHO, CH 3 OCH 3 , CH 3 OCHO, CH 3 COCH 3 , C 2 H 5 OH, C 2 H 5 CN, 13 CH 3 CN, and CH 3 C 15 N. Haro 5a IRS and OO Ser have emission from CH 3 OH, CH 3 CHO, CH 3 OCH 3 , and CH 3 OCHO. CH 3 COCH 3 is also detected in OO Ser. In V346 Nor we found CH 3 OH, CH 2 DOH, CH 3 CHO, CH 3 OCH 3 , CH 3 OCHO, and C 2 H 5 CN. The emission of COMs is compact in all targets. The analysis indicates that their temperatures are above 100 K. The abundance ratios of COMs derived for these eruptive YSOs, and for other protostars in the literature, span several orders of magnitude without any clear differentiation between the eruptive and quiescent YSOs. The column density of the main isotopolog of CH 3 OH should not be used as a reference, as most of the lines are optically thick. Conclusions. The hot and compact emission of COMs indicates that the four FUor-like targets are hot corino-like. Spectral studies of these objects can be useful for investigating the complex organic chemistry at later evolutionary stages than the usual Class 0 stage.
인공지능 문자 인식 모델을 통해 추출된 텍스트로, 일부 오타나 오류가 포함될 수 있으나 지속적으로 개선 중입니다.
오류를 발견하셨다면 해당 부분을 드래그한 후 ' 를 통해 신고해주세요.
오류를 발견하셨다면 해당 부분을 드래그한 후 ' 를 통해 신고해주세요.
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