Spitzer observations of red galaxies: Implication for high-redshift star formation

Citations of this article
Mendeley users who have this article in their library.
Get full text


My colleagues and I identified distant red galaxies (DRGs) with J - Ks> 2.3 in the southern Great Observatories Origins Deep Surveys (GOODS-S) field. These galaxies reside at z ∼ 1-3.5, (〈z〉 ≃ 2.2) and based on their ACS (0.4-1 μm), ISAAC (1-2.2 μm), and IRAC (3-8 μm) photometry, they typically have stellar masses M ≥ 1011M⊙. Interestingly, more than 50% of these objects have 24 μm flux densities ≥ 50 μJy. Attributing the IR emission to star-formation implies star-formation rates (SFRs) of ≃100-1000 M⊙yr-1. As a result, galaxies with M ≥ 1011M⊙have specific SFRs equal to or exceeding the global value at z ∼ 1.5-3. In contrast, galaxies with M ≥ 1011M⊙at z ∼ 0.3-0.75 have specific SFRs less than the global average, and more than an order of magnitude lower than that for massive DRGs at z ∼ 1.5-3. Thus, the bulk of star formation in massive galaxies is largely complete by z ∼ 1.5. The red colors and large inferred stellar masses in the DRGs suggest that much of the star formation in these galaxies occurred at redshifts z ≳ 5-6. Using model star-formation histories that match the DRG colors and stellar masses at z ∼ 2-3, and measurements of the UV luminosity density at z ≳ 5-6, we consider what constraints exist on the stellar initial mass function in the progenitors of the massive DRGs at z ∼ 2-3. © 2005 Elsevier B.V. All rights reserved.




Papovich, C. (2006, March). Spitzer observations of red galaxies: Implication for high-redshift star formation. New Astronomy Reviews. https://doi.org/10.1016/j.newar.2005.11.023

Register to see more suggestions

Mendeley helps you to discover research relevant for your work.

Already have an account?

Save time finding and organizing research with Mendeley

Sign up for free