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16 - Extragalactic Surveys: CANON and PHANGS-ALMA

from Part VI - External Galaxies

Published online by Cambridge University Press:  11 April 2023

Duncan MacKay ,
Mark Thompson  and
James Urquhart
Duncan MacKay
Affiliation:
University of Kent, Canterbury
Mark Thompson
Affiliation:
University of Leeds
James Urquhart
Affiliation:
University of Kent, Canterbury
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Summary

Two extra-Galactic surveys are considered. The first takes observations of nearly 200 GMCs across a small sample of local galaxies in the CANON CO survey. In spite of the local nature of the sample, results confirm essential facts about molecular gas distribution in galaxies other than our own, including a confirmed linear relationship between GMC virial mass and CO luminosity, which implies a constant CO-H2 conversion factor and supports a virialization assumption. The second survey, PHANGS-ALMA (Physics at High Angular Resolution in Nearby Galaxies with the Atacama Large Millimetre-submillimetre Array), maps CO emission from galaxies up to 17 Mpc away, with resolutions of 1″–1.5″ encompassing active star-forming galaxies down to total stellar masses ~5 × 109 M☉. Within 11 of those target galaxies considered here, the results offer tens of thousands of measurements at GMCs scales between 20 and 130 pc, comparable to Galactic-scale observations, and one outcome is confirmation of a positive correlation between GMC surface densities and velocity distributions.

Keywords

CANONPHANGS-ALMAexternal galaxiesGMCsluminosityvirial masssurface densityvelocity distributionkinetic energyself-gravitational potential energy
Type
Chapter
Information
Case Studies in Star Formation
A Molecular Astronomy Perspective
 , pp. 255 - 266
Publisher: Cambridge University Press
Print publication year: 2023

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