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Title: Deep, Broadband Spectral Line Surveys of Molecule-rich Interstellar Clouds

Abstract

Spectral line surveys are an indispensable tool for exploring the physical and chemical evolution of astrophysical environments due to the vast amount of data that can be obtained in a relatively short amount of time. We present deep, broadband spectral line surveys of 30 interstellar clouds using two broadband λ  = 1.3 mm receivers at the Caltech Submillimeter Observatory. This information can be used to probe the influence of physical environment on molecular complexity. We observed a wide variety of sources to examine the relative abundances of organic molecules as they relate to the physical properties of the source (i.e., temperature, density, dynamics, etc.). The spectra are highly sensitive, with noise levels ≤25 mK at a velocity resolution of ∼0.35 km s{sup −1}. In the initial analysis presented here, column densities and rotational temperatures have been determined for the molecular species that contribute significantly to the spectral line density in this wavelength regime. We present these results and discuss their implications for complex molecule formation in the interstellar medium.

Authors:
; ; ; ; ; ; ; ; ;  [1]; ;  [2]
  1. Department of Chemistry, Emory University, Atlanta, GA 30322 (United States)
  2. California Institute of Technology, Cahill Center for Astronomy and Astrophysics 301-17, Pasadena, CA 91125 (United States)
Publication Date:
OSTI Identifier:
22661098
Resource Type:
Journal Article
Journal Name:
Astrophysical Journal, Supplement Series
Additional Journal Information:
Journal Volume: 232; Journal Issue: 1; Other Information: Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 0067-0049
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; ABUNDANCE; ASTROPHYSICS; CLOUDS; DENSITY; EMISSION SPECTRA; INTERSTELLAR SPACE; MOLECULES; NOISE; PROBES; RESOLUTION; VELOCITY; WAVELENGTHS

Citation Formats

Widicus Weaver, Susanna L., Laas, Jacob C., Zou, Luyao, Kroll, Jay A., Rad, Mary L., Hays, Brian M., Sanders, James L., Cross, Trevor N., Wehres, Nadine, McGuire, Brett A., Lis, Dariusz C., and Sumner, Matthew C., E-mail: susanna.widicus.weaver@emory.edu. Deep, Broadband Spectral Line Surveys of Molecule-rich Interstellar Clouds. United States: N. p., 2017. Web. doi:10.3847/1538-4365/AA8098.
Widicus Weaver, Susanna L., Laas, Jacob C., Zou, Luyao, Kroll, Jay A., Rad, Mary L., Hays, Brian M., Sanders, James L., Cross, Trevor N., Wehres, Nadine, McGuire, Brett A., Lis, Dariusz C., & Sumner, Matthew C., E-mail: susanna.widicus.weaver@emory.edu. Deep, Broadband Spectral Line Surveys of Molecule-rich Interstellar Clouds. United States. doi:10.3847/1538-4365/AA8098.
Widicus Weaver, Susanna L., Laas, Jacob C., Zou, Luyao, Kroll, Jay A., Rad, Mary L., Hays, Brian M., Sanders, James L., Cross, Trevor N., Wehres, Nadine, McGuire, Brett A., Lis, Dariusz C., and Sumner, Matthew C., E-mail: susanna.widicus.weaver@emory.edu. Fri . "Deep, Broadband Spectral Line Surveys of Molecule-rich Interstellar Clouds". United States. doi:10.3847/1538-4365/AA8098.
@article{osti_22661098,
title = {Deep, Broadband Spectral Line Surveys of Molecule-rich Interstellar Clouds},
author = {Widicus Weaver, Susanna L. and Laas, Jacob C. and Zou, Luyao and Kroll, Jay A. and Rad, Mary L. and Hays, Brian M. and Sanders, James L. and Cross, Trevor N. and Wehres, Nadine and McGuire, Brett A. and Lis, Dariusz C. and Sumner, Matthew C., E-mail: susanna.widicus.weaver@emory.edu},
abstractNote = {Spectral line surveys are an indispensable tool for exploring the physical and chemical evolution of astrophysical environments due to the vast amount of data that can be obtained in a relatively short amount of time. We present deep, broadband spectral line surveys of 30 interstellar clouds using two broadband λ  = 1.3 mm receivers at the Caltech Submillimeter Observatory. This information can be used to probe the influence of physical environment on molecular complexity. We observed a wide variety of sources to examine the relative abundances of organic molecules as they relate to the physical properties of the source (i.e., temperature, density, dynamics, etc.). The spectra are highly sensitive, with noise levels ≤25 mK at a velocity resolution of ∼0.35 km s{sup −1}. In the initial analysis presented here, column densities and rotational temperatures have been determined for the molecular species that contribute significantly to the spectral line density in this wavelength regime. We present these results and discuss their implications for complex molecule formation in the interstellar medium.},
doi = {10.3847/1538-4365/AA8098},
journal = {Astrophysical Journal, Supplement Series},
issn = {0067-0049},
number = 1,
volume = 232,
place = {United States},
year = {2017},
month = {9}
}