Detection of hydroxyacetone in protostar IRAS 16293–2422 B  

作　　者：Yan Zhou Dong Hui Quan Xia Zhang Sheng-Li Qin 

机构地区：[1]Department of Astronomy,Yunnan University,and Key Laboratory of Astroparticle Physics of Yunnan Province,Kunming 650091,China [2]Xinjiang Astronomical Observatory,Chinese Academy of Sciences,Urumqi 830011,China [3]Department of Chemistry,Eastern Kentucky University,Richmond,KY 40475,USA

出　　处：《Research in Astronomy and Astrophysics》2020年第8期217-229,共13页天文和天体物理学研究（英文版）

基　　金：the National Key R&D Program of China(No.2017YFA0402701);by the Joint Research Fund in Astronomy(U1631237)under a cooperative agreement between the National Natural Science Foundation of China(NSFC);the Chinese Academy of Sciences(CAS);by the Top Talents Program of Yunnan Province(2015HA030);the NSFC(Grant No.11973075)。

摘　　要：Hydroxy acetone(CH3 COCH2 OH)is one of the smallest molecules that contain both hydroxyl and carbonyl group on neighboring carbon atoms.This steric configuration is characteristic of saccharides and determines their biochemical activity.The attempt to search for hydroxy acetone toward the massive star formation region Sagittarius B2(N)was unsuccessful.Here we report the first detection of CH3 COCH2 OH in the solar-type protostar IRAS 16293-2422 B,using the Atacama Large Millimeter Array science verification data at Band 4.In a total of 11 unblended transitions of CH3 COCH2 OH with upper level energies ranging from 86 to 246 K are identified.From our local thermodynamic equilibrium analysis,we derived that the rotational temperature of CH3 COCH2 OH is 160±21 K and the column density is(1.2±1.0)×10^16 cm^-2,which results in a fractional abundance of 7×10^-10 with respect to molecular hydrogen.In this work,we present the identification of CH3 COCH2 OH in IRAS 16293-2422 B and propose a simple formation mechanism.The unambiguous identification of hydroxyacetone may provide the basis for future study of the origin and evolution of saccharides in the interstellar medium.

关 键 词：ISM:abundances ISM:individual(IRAS 16293–2422 B) ISM:molecules 

分 类 号：P148[天文地球—天体物理]