Berger, E. and Chary, R. and Cowie, L. L. and Price, P. A. and Schmidt, B. P. and Fox, D. B. and Cenko, S. B. and Djorgovski, S. G. and Soderberg, A. M. and Kulkarni, S. R. and McCarthy, P. J. and Gladders, M. D. and Peterson, B. A. and Barger, A. J. (2007) Hubble Space Telescope and Spitzer Observations of the Afterglow and Host Galaxy of GRB 050904 at z = 6.295. Astrophysical Journal, 665 (1). pp. 102-106. ISSN 0004-637X http://resolver.caltech.edu/CaltechAUTHORS:20091016-151324786
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We present deep Hubble Space Telescope (HST ) and Spitzer Space Telescope observations of GRB 050904 at z = 6:295. We detect the afterglow in the H band more than 3 weeks after the burst and confirm the presence of a jet break at t ≈ 2:1 days. This leads to an estimated opening angle of about 4° and a beaming-corrected energy of about 10^(51) ergs, similar to those of lower redshift gamma-ray bursts (GRBs). We do not detect an underlying host galaxy with either HST or Spitzer. From the upper limits we infer an extinction-corrected absolute magnitude M_(UV) ≳ -20:3 mag, or L ≾ L^*, a star formation rate of ≾ 5.7M_⊙ yr^(-1), and a stellar mass of ≾ few x 10^9 M_⊙. A comparison to spectroscopically confirmed galaxies at z > 5:5 reveals that the host of GRB 050904 is fainter and has a lower star formation rate than at least 80% of these objects. Finally, using our luminosity limits, and the metallicity of about 0.05 Z_⊙ inferred from the afterglow absorption spectrum, we place the first limit on the luminosity-metallicity relation at z > 6. Future afterglow and host galaxy observations of z ≳ 4 GRBs should elucidate whether the mass- and luminosity-metallicity relations continue to evolve beyond the present limits of z ≾ 2.
|Additional Information:||© 2007 The American Astronomical Society. Received 2006 March 27; accepted 2007 April 28. We thank Lisa Kewley, Alice Shapley, and the anonymous referee for helpful comments on the manuscript. E. B. acknowledges support by NASA through Hubble Fellowship grant HST- 01171.01 awarded by the Space Telescope Science Institute (STScI), which is operated by AURA, Inc., for NASA under contract NAS5-26555. Additional support was provided by NASA through grant HST-GO-10616 from STScI and through a Spitzer award from JPL/Caltech.|
|Subject Keywords:||cosmology : observations; galaxies : abundances; galaxies : high-redshift; galaxies : starburst; gamma rays : bursts|
|Official Citation:||Hubble Space Telescope and Spitzer Observations of the Afterglow and Host Galaxy of GRB 050904 at z = 6.295 E. Berger, R. Chary, L. L. Cowie, P. A. Price, B. P. Schmidt, D. B. Fox, S. B. Cenko, S. G. Djorgovski, A. M. Soderberg, S. R. Kulkarni, P. J. McCarthy, M. D. Gladders, B. A. Peterson, and A. J. Barger 2007 ApJ 665 102-106 doi: 10.1086/519511|
|Usage Policy:||No commercial reproduction, distribution, display or performance rights in this work are provided.|
|Deposited By:||Tony Diaz|
|Deposited On:||26 Oct 2009 18:17|
|Last Modified:||26 Dec 2012 11:29|
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