Spitzer Observations of Gamma-Ray Burst Host Galaxies: A Unique Window into High Redshift Chemical Evolution and Star-formation

Abstract

We present deep Spitzer 3.6 micron observations of three z~5 GRB host galaxies. Our observations reveal that z~5 GRB hosts are a factor of 3 less luminous than the median rest-frame V-band luminosity of spectroscopically confirmed z~5 galaxies in the GOODS fields and the UDF. The strong connection between GRBs and massive star formation implies that not all star-forming galaxies at these redshifts are currently being accounted for in deep surveys and GRBs provide a unique way to measure the contribution to the star-formation rate density from galaxies at the faint end of the galaxy luminosity function. By correlating the co-moving star-formation rate density with co-moving GRB rates at lower redshifts, we estimate a lower limit to the star-formation rate density of 0.12+/-0.09 and 0.09+/-0.05 M_sun/yr/Mpc^3 at z~4.5 and z~6, respectively. Finally, we provide evidence that the average metallicity of star-forming galaxies evolves as (stellar mass density)^(0.69+/-0.17) between $z\sim 5$ and $z\sim 0$, probably indicative of the loss of a significant fraction of metals to the intergalactic medium, particularly in low-mass galaxies.

ApJ, in press

References in corpus (9)

• The Mass-Metallicity Relation at z~2
• Long gamma-ray bursts and core-collapse supernovae have different environments
• UV star-formation rates of GRB host galaxies
• The Stellar Masses and Star Formation Histories of Galaxies at z ~ 6: Constraints from Spitzer Observations in the Great Observatories Origins Deep Survey
• The rest-frame optical luminosity functions of galaxies at 2<z<3.5
• Ly-alpha and UV emission from high-redshift GRB hosts: To what extent do GRBs trace star formation?
• The Interstellar Medium of GRB Host Galaxies I. Echelle Spectra of Swift GRB Afterglows
• Luminosity Functions of Lyman-Break Galaxies at z~4 and 5 in the Subaru Deep Field
• High-redshift Ly alpha emitters with a large equivalent width: Properties of i-dropout galaxies with an NB921-band depression in the Subaru Deep Field

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• The optically unbiased GRB host (TOUGH) survey. I. Survey design and catalogs
• The Impact of Star Formation and Gamma-Ray Burst Rates at High Redshift on Cosmic Chemical Evolution and Reionization
• A Comparative Study of Long and Short GRBs. I. Overlapping Properties
• Unveiling the Secrets of Metallicity and Massive Star Formation Using DLAs along Gamma-ray Bursts
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• Using Spatial Distributions to Constrain Progenitors of Supernovae and Gamma Ray Bursts
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• The Stellar Initial Mass Function at the Epoch of Reionization
• Revisiting the luminosity and redshift distributions of long gamma-ray bursts
• Some statistical remarks on the Giant GRB Ring
• GRB 221009A: An ordinary nearby GRB with extraordinary observational properties
• Gamma-ray Bursts and the Early Star-formation History
• Gamma-ray burst cosmology: Hubble diagram and star formation history
• One star, two stars, or both? Investigating metallicity-dependant models for Gamma-Ray Burst progenitors with the IllustrisTNG simulation
• The nature of Long-GRB host galaxies from chemical abundances
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