Hostname: page-component-77c89778f8-fv566 Total loading time: 0 Render date: 2024-07-24T19:56:19.077Z Has data issue: false hasContentIssue false

What is a GMC? Are observers and simulators discussing the same star-forming clouds?

Published online by Cambridge University Press:  12 September 2016

Hsi-An Pan
Affiliation:
Department of Physics, Hokkaido University, Kita 8, Nishi 5, Kita-ku, Sapporo, Hokkaido 060-0808, Japan email: hapan@astro1.sci.hokudai.ac.jp
Yusuke Fujimoto
Affiliation:
Department of Physics, Hokkaido University, Kita 8, Nishi 5, Kita-ku, Sapporo, Hokkaido 060-0808, Japan email: hapan@astro1.sci.hokudai.ac.jp
Elizabeth J. Tasker
Affiliation:
Department of Physics, Hokkaido University, Kita 8, Nishi 5, Kita-ku, Sapporo, Hokkaido 060-0808, Japan email: hapan@astro1.sci.hokudai.ac.jp
Rights & Permissions [Opens in a new window]

Abstract

Core share and HTML view are not available for this content. However, as you have access to this content, a full PDF is available via the ‘Save PDF’ action button.

Observations and simulations have now reached the point where the giant molecular cloud (GMCs) populations can be studied over a whole galaxy. This is immensely helpful for understanding star formation. Yet, are these two groups really comparing the same objects? While simulators work in 6D (x, y, z, vx, vy, vz) position-position-position (PPP) space, observers see 2 + 1D (RA, Dec, vlos) projected properties along the line of sight, identifying clouds in position-position-velocity (PPV) space. In this research we generated PPP and PPV data for a high-resolution simulated galaxy and compared the identified clouds in both data sets. The results show that 70% of the clouds have a single counterpart in each data structure. Cloud boundaries of these clouds are indeed the same. Scatter of the derived cloud properties (radius and velocity dispersion) between PPP and PPV are typically within a factor of two. However, this small scatter can make it difficult to determine if a cloud is truly gravitationally bound.

Type
Poster Papers
Copyright
Copyright © International Astronomical Union 2016 

References

Fujimoto, Y., Tasker, E. J., Wakayama, M., & Habe, A. 2014, MNRAS, 439, 936 CrossRefGoogle Scholar
Pan, H.-A., Fujimoto, Y., Tasker, E. J. et al. 2015, MNRAS, 453, 3082 Google Scholar
Rosolowsky, E., & Leroy, A. 2006, PASP, 118, 590 Google Scholar