Widespread Presence of Glycolaldehyde and Ethylene Glycol Around Sagittarius B2

Abstract

We report the detection of widespread CH${}_2$OHCHO and HOCH${}_2$CH${}_2$OH emission in Galactic center giant molecular cloud Sagittarius B2 using the Shanghai Tianma 65m Radio Telescope. Our observations show for the first time that the spatial distribution of these two important prebiotic molecules extends over 15 arc-minutes, corresponding to a linear size of approximately 36 pc. These two molecules are not just distributed in or near the hot cores. The abundance of these two molecules seems to decrease from the cold outer region to the central region associated with star-formation activity. Results present here suggest that these two molecules are likely to form through a low temperature process. Recent theoretical and experimental studies demonstrated that prebiotic molecules can be efficiently formed in icy grain mantles through several pathways. However, these complex ice features cannot be directly observed, and most constraints on the ice compositions come from millimeter observations of desorbed ice chemistry products. These results, combined with laboratory studies, strongly support the existence of abundant prebiotic molecules in ices.

arXiv comment20 pages, 7 figures, accepted by ApJ

References in corpus (37)

• Trigonometric Parallaxes of High Mass Star Forming Regions: the Structure and Kinematics of the Milky Way
• Complex Chemistry in Star-Forming Regions: An Expanded Gas-Grain Warm-up Chemical Model
• Formation rates of complex organics in UV irradiated CH3OH-rich ices I: Experiments
• Complex organic molecules in the interstellar medium: IRAM 30 m line survey of Sagittarius B2(N) and (M)
• The ALMA Protostellar Interferometric Line Survey (PILS): First results from an unbiased submillimeter wavelength line survey of the Class 0 protostellar binary IRAS 16293-2422 with ALMA
• Discovery of the Interstellar Chiral Molecule Propylene Oxide (CH${}_3$CHCH${}_2$O)
• Formation of complex organic molecules in cold objects: the role of gas phase reactions
• Detection of the simplest sugar, glycolaldehyde, in a solar-type protostar with ALMA
• Reactive Desorption and Radiative Association as Possible Drivers of Complex Molecule Formation in the Cold Interstellar Medium
• Dense gas in the Galactic central molecular zone is warm and heated by turbulence
• The Spatial Distribution of Complex Organic Molecules in the L1544 Pre-stellar Core
• The largest oxigen bearing organic molecule repository
• H-atom addition and abstraction reactions in mixed CO, H2CO and CH3OH ices: an extended view on complex organic molecule formation
• Constraining the abundances of complex organics in the inner regions of solar-type protostars
• Experimental evidence for Glycolaldehyde and Ethylene Glycol formation by surface hydrogenation of CO molecules under dense molecular cloud conditions
• Star formation rates and efficiencies in the Galactic Centre
• Comparing molecular gas across cosmic time-scales: the Milky Way as both a typical spiral galaxy and a high-redshift galaxy analogue
• First detection of glycolaldehyde outside the Galactic Center
• The Galactic Center Molecular Cloud Survey. I. A Steep Linewidth-Size Relation & Suppression of Star Formation
• L1157-B1, a factory of complex organic molecules in a Solar-type star forming region
• The Bolocam Galactic Plane Survey IV: 1.1 and 0.35 mm Dust Continuum Emission in the Galactic Center Region
• The formation of ethylene glycol and other complex organic molecules in star-forming regions
• Glycolaldehyde Formation via the Dimerisation of the Formyl Radical
• Detection of glycolaldehyde towards the solar-type protostar NGC1333 IRAS2A
• The (impossible?) formation of acetaldehyde on the grain surfaces: insights from quantum chemical calculations
• Production of complex organic molecules: H-atom addition versus UV irradiation
• On the formation of glycolaldehyde in dense molecular cores
• Antifreeze in the hot core of Orion - First detection of ethylene glycol in Orion-KL
• Widespread Methanol Emission from the Galactic Center
• A 1.3 cm Line Survey toward Orion KL
• Cloud-cloud Collision in the Galactic Center 50 km s${}^{-1}$ Molecular Cloud
• TMRT Observations of Carbon-chain molecules in Serpens South 1A
• Oxygen isotopic ratios in galactic clouds along the line of sight towards Sagittarius B2
• Complex Organic Molecules tracing shocks along the outflow cavity in the high-mass protostar IRAS20126+4104
• Tentative detection of ethylene glycol toward W51/e2 and G34.3+0.2
• A study of methanol and silicon monoxide production through episodic explosions of grain mantles in the Central Molecular Zone
• Abundant Methanol Ice toward a Massive Young Stellar Object in the Central Molecular Zone

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