Hostname: page-component-78c5997874-m6dg7 Total loading time: 0 Render date: 2024-11-04T21:28:29.504Z Has data issue: false hasContentIssue false
  • English
  • Français

An evolving photoelectric efficiency at cosmic noon?

Published online by Cambridge University Press:  04 June 2020

Jed McKinney Open the ORCID record for Jed McKinney [Opens in a new window] ,
Alexandra Pope ,
Lee Armus ,
Ranga Chary ,
Mark Dickinson  and
Allison Kirkpatrick
Jed McKinney
Affiliation:
Department of Astronomy, University of Massachusetts, Amherst, MA01003, USA
Alexandra Pope
Affiliation:
Department of Astronomy, University of Massachusetts, Amherst, MA01003, USA
Lee Armus
Affiliation:
Infrared Processing and Analysis Center, MC 314-6, Caltech, 1200 E. California Blvd., Pasadena, CA91125, USA
Ranga Chary
Affiliation:
Division of Physics, Math & Astronomy, California Institute of Technology, Pasadena, CA91125
Mark Dickinson
Affiliation:
National Optical Astronomy Observatory, 950 North Cherry Avenue, Tucson, AZ85719, USA
Allison Kirkpatrick
Affiliation:
Department of Physics & Astronomy, University of Kansas, Lawrence, KS66045, USA
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.

To sustain star formation rates (SFRs) of hundreds to thousands of solar masses per year over millions of years, a galaxy must efficiently cool its gas. At z ∼ 2, the peak epoch for stellar mass assembly, tracers of gas heating and cooling remain largely unexplored. For one z ∼ 2 starburst galaxy GS IRS20, we present Spitzer IRS spectroscopy of Polycyclic Aromatic Hydrocarbon (PAH) emission, and ALMA observations of [C II] 158 μm fine-structure emission which we use to probe ISM heating/cooling. Coupled with an unusually warm dust component, the ratio of [C II] /PAH emission suggests a low photolelectric efficiency, and/or the importance of cooling from other far-IR lines in this galaxy. A low photoelectric efficiency at z ∼ 2 could be key for the peak in the SFR density of the universe by decoupling stellar radiation from ISM gas temperatures.

Keywords

galaxies: high-redshiftgalaxies: individualgalaxies: ISMgalaxies: starburst
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 15 , Symposium S352: Uncovering Early Galaxy Evolution in the ALMA and JWST Era , June 2019 , pp. 243 - 245
Copyright
© International Astronomical Union 2020

References

Helou, G., Malhotra, S., Hollenbach, D. J., Dale, D. A., & Contursi, A. 2001, ApJL, 548, L7310.1086/318916CrossRefGoogle Scholar
Tielens, A. G. G. M., & Hollenbach, D. 1985, ApJ, 291, 72210.1086/163111CrossRefGoogle Scholar
Pope, A., Wagg, J., Frayer, D., et al. 2013, ApJ, 772, 9210.1088/0004-637X/772/2/92CrossRefGoogle Scholar
Zanella, A., Daddi, E., Magdis, G., et al. 2018, MNRAS, 481, 1976CrossRefGoogle Scholar
Brisbin, D., Ferkinhoff, C., Nikola, T., et al. 2015, ApJ, 799, 1310.1088/0004-637X/799/1/13CrossRefGoogle Scholar
Kirkpatrick, A., Pope, A., Sajina, A., et al. 2015, ApJ, 814, 910.1088/0004-637X/814/1/9CrossRefGoogle Scholar
Díaz-Santos, T., Armus, L., Charmandaris, V., et al. 2017, ApJ, 846, 3210.3847/1538-4357/aa81d7CrossRefGoogle Scholar
Croxall, K. V, Smith, J. D., Wolfire, M. G., et al. 2012, ApJ, 747, 81Google Scholar