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Title: ALMA Maps of Dust and Warm Dense Gas Emission in the Starburst Galaxy IC 5179

Abstract

We present our high-resolution (0.″15 × 0.″13, ∼34 pc) observations of the CO (6−5) line emission, which probes the warm and dense molecular gas, and the 434 μ m dust continuum emission in the nuclear region of the starburst galaxy IC 5179, conducted with the Atacama Large Millimeter Array (ALMA). The CO (6−5) emission is spatially distributed in filamentary structures with many dense cores and shows a velocity field that is characteristic of a circumnuclear rotating gas disk, with 90% of the rotation speed arising within a radius of ≲150 pc. At the scale of our spatial resolution, the CO (6−5) and dust emission peaks do not always coincide, with their surface brightness ratio varying by a factor of ∼10. This result suggests that their excitation mechanisms are likely different, as further evidenced by the southwest to northeast spatial gradient of both CO-to-dust continuum ratio and Pa- α equivalent width. Within the nuclear region (radius ∼ 300 pc) and with a resolution of ∼34 pc, the CO line flux (dust flux density) detected in our ALMA observations is 180 ± 18 Jy km s{sup −1} (71 ± 7 mJy), which accounts for 22% (2.4%) of the total value measured bymore » Herschel .« less

Authors:
 [1]; ;  [2];  [3];  [4];  [5];  [6];  [7];  [8]
  1. Yunnan Observatories, Chinese Academy of Sciences, Kunming 650011 (China)
  2. National Astronomical Observatories of China, Chinese Academy of Sciences, Beijing 100012 (China)
  3. Núcleo de Astronomía de la Facultad de Ingeniería, Universidad Diego Portales, Av. Ejército Libertador 441, Santiago (Chile)
  4. Purple Mountain Observatory, Chinese Academy of Sciences, Nanjing 210008 (China)
  5. Department of Physics, University of Crete, GR-71003 Heraklion (Greece)
  6. Leiden Observatory, Leiden University, P.O. Box 9513, 2300 RA Leiden (Netherlands)
  7. Institute for Astronomy, University of Edinburgh, Royal Observatory, Blackford Hill, Edinburgh EH9 3HJ (United Kingdom)
  8. School of Space Science and Physics, Shandong University at Weihai, Weihai, Shandong 264209 (China)
Publication Date:
OSTI Identifier:
22663262
Resource Type:
Journal Article
Journal Name:
Astrophysical Journal
Additional Journal Information:
Journal Volume: 845; Journal Issue: 1; Other Information: Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 0004-637X
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; BRIGHTNESS; CARBON MONOXIDE; COSMIC DUST; EMISSION; EXCITATION; FLUX DENSITY; GALACTIC EVOLUTION; GALAXIES; GALAXY NUCLEI; ROTATION; SPATIAL RESOLUTION; SURFACES; VELOCITY

Citation Formats

Zhao Yinghe, Lu, Nanyao, Xu, C. Kevin, Díaz-Santos, Tanio, Gao Yu, Charmandaris, Vassilis, Werf, Paul van der, Zhang Zhi-Yu, and Cao, Chen, E-mail: zhaoyinghe@ynao.ac.cn. ALMA Maps of Dust and Warm Dense Gas Emission in the Starburst Galaxy IC 5179. United States: N. p., 2017. Web. doi:10.3847/1538-4357/AA7FF8.
Zhao Yinghe, Lu, Nanyao, Xu, C. Kevin, Díaz-Santos, Tanio, Gao Yu, Charmandaris, Vassilis, Werf, Paul van der, Zhang Zhi-Yu, & Cao, Chen, E-mail: zhaoyinghe@ynao.ac.cn. ALMA Maps of Dust and Warm Dense Gas Emission in the Starburst Galaxy IC 5179. United States. doi:10.3847/1538-4357/AA7FF8.
Zhao Yinghe, Lu, Nanyao, Xu, C. Kevin, Díaz-Santos, Tanio, Gao Yu, Charmandaris, Vassilis, Werf, Paul van der, Zhang Zhi-Yu, and Cao, Chen, E-mail: zhaoyinghe@ynao.ac.cn. Thu . "ALMA Maps of Dust and Warm Dense Gas Emission in the Starburst Galaxy IC 5179". United States. doi:10.3847/1538-4357/AA7FF8.
@article{osti_22663262,
title = {ALMA Maps of Dust and Warm Dense Gas Emission in the Starburst Galaxy IC 5179},
author = {Zhao Yinghe and Lu, Nanyao and Xu, C. Kevin and Díaz-Santos, Tanio and Gao Yu and Charmandaris, Vassilis and Werf, Paul van der and Zhang Zhi-Yu and Cao, Chen, E-mail: zhaoyinghe@ynao.ac.cn},
abstractNote = {We present our high-resolution (0.″15 × 0.″13, ∼34 pc) observations of the CO (6−5) line emission, which probes the warm and dense molecular gas, and the 434 μ m dust continuum emission in the nuclear region of the starburst galaxy IC 5179, conducted with the Atacama Large Millimeter Array (ALMA). The CO (6−5) emission is spatially distributed in filamentary structures with many dense cores and shows a velocity field that is characteristic of a circumnuclear rotating gas disk, with 90% of the rotation speed arising within a radius of ≲150 pc. At the scale of our spatial resolution, the CO (6−5) and dust emission peaks do not always coincide, with their surface brightness ratio varying by a factor of ∼10. This result suggests that their excitation mechanisms are likely different, as further evidenced by the southwest to northeast spatial gradient of both CO-to-dust continuum ratio and Pa- α equivalent width. Within the nuclear region (radius ∼ 300 pc) and with a resolution of ∼34 pc, the CO line flux (dust flux density) detected in our ALMA observations is 180 ± 18 Jy km s{sup −1} (71 ± 7 mJy), which accounts for 22% (2.4%) of the total value measured by Herschel .},
doi = {10.3847/1538-4357/AA7FF8},
journal = {Astrophysical Journal},
issn = {0004-637X},
number = 1,
volume = 845,
place = {United States},
year = {2017},
month = {8}
}