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ALMA CO Clouds and Young Star Complexes in the Interacting Galaxies IC 2163 and NGC 2207

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  • Debra Meloy Elmegreen
  • Bruce G. Elmegreen
  • Michele Kaufman
  • Elias Brinks
  • Curtis Struck
  • Frederic Bournaud
  • Kartik Sheth
  • Stephanie Juneau
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Original languageEnglish
Article number43
Number of pages10
JournalThe Astrophysical Journal
Publication statusPublished - 22 May 2017


ALMA observations of CO(1-0) emission in the interacting galaxies IC 2163 and NGC 2207 are used to determine the properties of molecular clouds and their association with star-forming regions observed with the Hubble Space Telescope. Half of the CO mass is in 249 clouds each more massive than 4.0x10^5Mo. The mass distribution functions for the CO clouds and star complexes in a galactic-scale shock front in IC 2163 both have a slope on a log-log plot of -0.7, similar to what is observed in Milky Way clouds. The molecular cloud mass function is steeper in NGC 2207. The CO distribution in NGC 2207 also includes a nuclear ring, a mini-bar, and a mini-starburst region that dominates the 24micron, radio, and Halpha emission in both galaxies. The ratio of the sum of the masses of star complexes younger than 30 Myr to the associated molecular cloud masses is ~4%. The maximum age of star complexes in the galactic-scale shock front in IC 2163 is about 200 Myr, the same as the interaction time of the two galaxies, suggesting the destruction of older complexes in the eyelids.


Original content from this work may be used under the terms of the Creative Commons Attribution 3.0 licence. Any further distribution of this work must maintain attribution to the author(s) and the title of the work, journal citation and DOI. Debra Meloy Elmegreen, et al, 'ALMA CO Clouds and Young Star Complexes in the Interacting Galaxies IC 2163 and NGC 2207', The Astrophysical Journal, 841:43 (10pp), 22 May 2017, doi: © 2017. The American Astronomical Society. All rights reserved.


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