The surprising complexity of diffuse and translucent clouds toward Sgr B2: Diatomics and COMs from 4 GHz to 1.2 THz

McGuire, Brett A.

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https://hdl.handle.net/2142/96794 Copy

Description

Title

The surprising complexity of diffuse and translucent clouds toward Sgr B2: Diatomics and COMs from 4 GHz to 1.2 THz

Author(s)

McGuire, Brett A.

Contributor(s)

• Remijan, Anthony
• McCarthy, Michael C.
• Schilke, P.
• Martin-Drumel, Marie-Aline
• Corby, Joanna F.

Issue Date

2017-06-19

Keyword(s)

Atacama Large Millimeter/submillimeter Array (ALMA)'s molecular view

Date of Ingest

• 2017-07-27T20:14:50Z
• 2018-01-29T23:02:31Z

Abstract

Many diffuse and translucent clouds lie along the line of sight between Earth and the Galactic Center that can be probed through molecular absorption at characteristic velocities. We highlight results of a study of diffuse and translucent clouds along the line of sight to Sgr B2, including SOFIA observations of SH near 1.4 THz and GBT PRIMOS observations from 4 to 50 GHz. We find significant variation in the chemical conditions within these clouds, and the abundances do not appear to correlate with the total optical depth. Additionally, from the GBT observations, we report the first detections of multiple complex organic molecules (COMs) in diffuse and translucent clouds, including CH$_3$CN, HC$_3$N, CH$_3$CHO, and NH$_2$CHO. We compare the GBT results to complementary observations of SH, chem{H_2S}, and others at mm, sub-mm, and THz frequencies from the NRAO 12m, Herschel HIFI, and SOFIA facilities, and comment on the insights into interstellar sulfur chemistry which is currently not well constrained.

Publisher

International Symposium on Molecular Spectroscopy

Type of Resource

text

Genre of Resource

Conference Paper / Presentation

Language

eng

Permalink

http://hdl.handle.net/2142/96794

DOI

https://doi.org/10.15278/isms.2017.MF05

Copyright and License Information

Copyright 2017 Brett A. McGuire

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