An ALMA sub-arcsecond view of molecular gas in massive star-forming region G10.6-0.4

Law, Charles John

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https://hdl.handle.net/2142/104386 Copy

Description

Title

An ALMA sub-arcsecond view of molecular gas in massive star-forming region G10.6-0.4

Author(s)

Law, Charles John

Contributor(s)

• Liu, Hauyu Baobab
• Ho, Paul T.P.
• Keto, Eric
• Galván-Madrid, Roberto
• Öberg, Karin I
• Zhang, Qizhou

Issue Date

2019-06-19

Keyword(s)

Astrochemistry and astrobiology in the age of Atacama Large Millimeter/submillimeter Array (ALMA)

Abstract

While massive star-forming regions are known to exhibit an extremely rich and diverse chemistry, few such sources have been mapped at high spatial resolution. Since the chemical structure of these sources displays substantial spatial variation among species on small scales (${\sim}10^4$~AU), high spatial resolution observations are needed to constrain chemical evolution models of massive star formation. We will present new ALMA 1.3 mm observations toward massive OB cluster-forming region G10.6-0.4 at a resolution of 0.12$^{\prime \prime}$ (600 AU). While the kinematics of G10.6 have been extensively studied at centimeter wavelengths, sensitive and high angular resolution observations in the millimeter and submillimeter regime have been lacking. Given the high sensitivity and bandwidth of our ALMA observations, we are able to derive rotational temperature and column density maps toward the central 8$^{\prime \prime}$ by 8$^{\prime \prime}$ region of G10.6 for over 10 different species, including traditional warm gas tracers such as CH$_3$CN, shock tracers HNCO and SiO, and a variety of complex organic molecules. Combined with our simultaneous observations of ionized gas in hydrogen recombination lines, our exquisite spatial resolution allows us to constrain the chemical influences of massive stellar feedback in the form of highly structured and inhomogeneous molecular emission, prominent spatial anti-correlations between molecular and ionized gas, and order-of-magnitude variations in physical gas conditions.

Publisher

International Symposium on Molecular Spectroscopy

Type of Resource

text

Language

eng

Permalink

http://hdl.handle.net/2142/104386

DOI

https://doi.org/10.15278/isms.2019.WG03

Copyright and License Information

Copyright 2019 Charles John Law

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