The Distribution Of Astronomical Aldehydes - The Case For Extended Emission Of Acetaldehyde (ch3cho).

Burkhardt, Andrew

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https://hdl.handle.net/2142/51093 Copy

Description

Title

The Distribution Of Astronomical Aldehydes - The Case For Extended Emission Of Acetaldehyde (ch3cho).

Author(s)

Burkhardt, Andrew

Contributor(s)

• Remijan, Anthony
• Corby, Joanna F.
• Dollhopf, Niklaus M.
• Loomis, Ryan

Issue Date

2014-06-18

Keyword(s)

Mini-symposium: Astronomical Molecular Spectroscopy in the Age of ALMA

Abstract

With the advent of new broadband spectral line interferometric observations, we can now begin to fully characterize the spectra and distribution of complex organic molecules that have been largely ignored since their original detections using single dish telescopes. First detected in 1973, acetaldehyde (CH$_3$CHO) has been detected in numerous sources including TMC-1, Sgr B2(N) and Orion KL (Gottlieb et al 1973; Mathews et al. 1984; Johansson et al. 1991); yet its distribution within these sources is still not well known. Unlike a number of other molecules observed in these regions, acetaldehyde is not observed to be concentrated in hot core regions toward Sgr B2(N), but to have an extended distribution, a trait shared by other aldehydes (Hollis et al. 2001; Chengalur and Kanekar, 2003). An extended distribution may indicate formation through gas phase ion molecule reactions, or that the distribution is a result of non-thermal processes liberating the molecule off grain surfaces. Meanwhile, a compact distribution may indicate warm grain surface chemistry with subsequent desorption by thermal processes. Spatial mACS will also help determine abundance correlations with other related molecules such as formic acid, aiding in the investigation of formation routes. In this talk, we present multiple transition mACS of acetaldehyde toward Orion KL using both CARMA and the ALMA Band 6 Science Verification data which show evidence of an extended distribution of acetaldehyde, suggesting a similar formation chemistry in Orion KL as suggested by Chengular and Kanekar (2003) towards Sgr B2(N). In addition, spatial correlations to other molecules in the region will be shown, possibly suggesting a common formation chemistry for some aldehydes.

Publisher

International Symposium on Molecular Spectroscopy

Type of Resource

text

Language

English

Permalink

http://hdl.handle.net/2142/51093

DOI

https://doi.org/10.15278/isms.2014.WF08

Copyright and License Information

Copyright 2014 by the authors. Licensed under a Creative Commons Attribution 4.0 International License. http://creativecommons.org/licenses/by/4.0/

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