Constraining the nature of the most distant Gamma-Ray Burst host galaxies

Abstract

Long duration gamma-ray bursts (GRBs) allow us to explore the distant Universe, and are potentially the most effective tracer of the most distant objects. Our current knowledge of the properties of GRB host galaxies at redshifts >5 is very scarce. We propose to improve this situation by obtaining more observations of high-redshift hosts to better understand their properties and help enable us to use GRBs as probes of the high-redshift universe. We performed very deep photometric observations of three high-redshift GRB host galaxies, GRB 080913 at z =6.7, GRB 060927 at z =5.5 and GRB 060522 at z =5.1. In addition, we completed deep spectroscopic observations of the GRB080913 host galaxy with X-Shooter at the VLT to search for Ly-alpha emission. For the sake of the discussion, we use published results on another high-redshift GRB host, GRB 050904 at z = 6.3. The sample of GRB host galaxies studied in this paper consists of four out of the five spectroscopically confirmed GRBs at z>5. Despite our presented observations being the deepest ever reported of high-redshift GRB host galaxies, we do not detect any of the hosts, neither in photometry nor in spectroscopy in the case of GRB 080913. These observations indicate that the GRB host galaxies seem to evolve with time and to have lower SFRs at z >5 than they have at z<1. In addition, the host galaxy of GRB 080913 at z =6.7 does not show Ly-alpha emission. While the measured properties of the galaxies in our sample agree with the properties of the general galaxy population at z>5, our observations are not sufficiently sensitive to allow us to infer further conclusions on whether this specific population is representative of the general one. The characterization of high-redshift GRB host galaxies is a very challenging endeavor requiring a lot of telescope time, but is necessary to improve our understanding of the high-redshift universe.

Accepted to A&A

References in corpus (18)

• The Galaxy Population Hosting Gamma-Ray Bursts
• Spectroscopic Confirmation of Three z-Dropout Galaxies at z = 6.844 - 7.213: Demographics of Lyman-Alpha Emission in z ~ 7 Galaxies
• A galaxy at a redshift z = 6.96
• Spectroscopic confirmation of z~7 LBGs: probing the earliest galaxies and the epoch of reionization
• UV star-formation rates of GRB host galaxies
• Keck Spectroscopy of Faint 3<z<8 Lyman Break Galaxies:- Evidence for a Declining Fraction of Emission Line Sources In the Redshift Range 6<z<8
• Completing the Census of Ly-alpha Emitters at the Reionization Epoch
• The line-of-sight towards GRB 030429 at z = 2.66: Probing the matter at stellar, galactic and intergalactic scales
• On the formation of dwarf galaxies and stellar halos
• High-Redshift Starbursting Dwarf Galaxies Revealed by GRB Afterglows
• Ly-alpha and UV emission from high-redshift GRB hosts: To what extent do GRBs trace star formation?
• The GRB 030329 host: a blue low metallicity subluminous galaxy with intense star formation
• The nature of the dwarf starforming galaxy associated with GRB 060218 / SN2006aj
• Gamma-Ray Burst Selected High Redshift Galaxies: Comparison to Field Galaxy Populations to z~3
• Detection of GRB 060927 at z = 5.47: Implications for the Use of Gamma-Ray Bursts as Probes of the End of the Dark Ages
• Evolution of the observed Ly-alpha luminosity function from z = 6.5 to z = 7.7: evidence for the epoch of reionization ?
• Exploring dust extinction at the edge of reionization
• Is GRB 050904 at z=6.3 absorbed by dust?

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