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Identifying Variations to the IMF at High-z Through Deep Radio Surveys

Murphy, Eric J. (2011) Identifying Variations to the IMF at High-z Through Deep Radio Surveys. In: UP2010: Have Observations Revealed a Variable Upper End of the Initial Mass Function? ASP Conference Series. No.440. Astronomical Society of the Pacific , San Francisco, CA, pp. 361-368. ISBN 978-1-58381-760-5.

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In this article I briefly describe how deep radio surveys may provide a means to identify variations in the upper end of the initial mass function (IMF) in star-forming galaxies at high redshifts (i.e., z ≳ 3). At such high redshifts, I argue that deep radio continuum observations at frequencies ≳10 GHz using next generation facilities (e.g., EVLA, MeerKAT, SKA/NAA) will likely provide the most accurate measurements for the ionizing photon rates (star formation rates; SFRs) of normal galaxies since their non-thermal emission should be highly suppressed due to the increased inverse Compton (IC) losses from the cosmic microwave background (CMB), leaving only thermal (free-free) emission detectable. Thus, a careful analysis of such observations in combination with future ALMA and JWST data, measuring the rest-frame far-infrared and UV emission from the same population of galaxies, may yield the best means to search for variability in the stellar IMF at such epochs.

Item Type:Book Section
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Murphy, Eric J.0000-0001-7089-7325
Additional Information:© 2011 Astronomical Society of the Pacific. I would like to thank the organizers of the UP2010 conferences for putting together an exciting and diverse program, as well for letting me be a part of it.
Group:Space Astrophysics Laboratory
Series Name:ASP Conference Series
Issue or Number:440
Record Number:CaltechAUTHORS:20110623-095747177
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:24180
Deposited By: Tony Diaz
Deposited On:23 Jun 2011 21:19
Last Modified:03 Oct 2019 02:53

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