Water and acetaldehyde in HH212: The first hot corino in Orion

被引：39
|
作者：
Codella, C. [1 ,2 ,3 ]
Ceccarelli, C. [1 ,2 ,3 ]
Cabrit, S. [2 ,3 ,4 ]
Gueth, F. [5 ]
Podio, L. [1 ]
Bachiller, R. [6 ]
Fontani, F. [1 ]
Gusdorf, A. [4 ]
Lefloch, B. [2 ,3 ]
Leurini, S. [7 ]
Tafalla, M. [6 ]
机构：
[1] Osserv Astrofis Arcetri, INAF, Largo E Fermi 5, I-50125 Florence, Italy
[2] Univ Grenoble Alpes, IPAG, F-38401 Grenoble, France
[3] CNRS, IPAG, F-38401 Grenoble, France
[4] Ecole Normale Super, Observ Paris, CNRS, LERMA,UMR 8112, 61 Ave Observ, F-75014 Paris, France
[5] Inst Radio Astron Millimetr, 300 Rue Piscine, F-38406 St Martin Dheres, France
[6] Observ Astron Nacl, IGN, Alfonso 12 3, Madrid 28014, Spain
[7] Max Planck Inst Radioastron, Hugel 69, D-53121 Bonn, Germany
来源：
ASTRONOMY & ASTROPHYSICS | 2016年 / 586卷
关键词：
stars: formation; ISM: jets and outflows; ISM: molecules; ISM: individual objects; SOLAR-TYPE PROTOSTAR; JET; SUBMILLIMETER; HH-212; MILLIMETER; DISK; GAS;
D O I：
10.1051/0004-6361/201527424
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
Aims. Using the unprecedented combination of high resolution and sensitivity offered by ALMA, we aim to investigate whether and how hot corinos, circumstellar disks, and ejected gas are related in young solar-mass protostars. Methods. We observed CH3CHO and deuterated water (HDO) high-excitation (E-u up to 335 K) lines towards the Sun-like protostar HH212-MM1. Results. For the first time, we have obtained images of CH3CHO and HDO emission in the inner similar or equal to 100 AU of HH212. The multifrequency line analysis allows us to contrain the density (>= 10(7) cm(-3)), temperature (similar or equal to 100 K), and CH3CHO abundance (similar or equal to 0.2-2 x 10(-9)) of the emitting region. The HDO profile is asymmetric at low velocities (<= 2 km s(-1) from V-sys). If the HDO line is optically thick, this points to an extremely small (similar to 20-40 AU) and dense (>= 10(9) cm(-3)) emitting region. Conclusions. We report the first detection of a hot corino in Orion. The HDO asymmetric profile indicates a contribution of outflowing gas from the compact central region, possibly associated with a dense disk wind.
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页数：5
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