The redshift determination of GRB 990506 and GRB 000418 with the Echellete Spectrograph Imager on Keck

Details The redshift determination of GRB 990506 and GRB 000418 with the Echellete Spectrograph Imager on Keck The redshift determination of GRB 990506 and GRB 000418 with the Echellete Spectrograph Imager on Keck

2002-12-05

arxiv.org/abs/astro-ph/0212123v1

Astron.J. 125 (2003) 999-1005

Astronomy and Astrophysics

Astrophysics

To appear in the Astronomical Journal (accepted 4 December 2002). 15 pages, 3 Postscript figures

Scientific paper

10.1086/367805

Using the Echellete Spectrograph Imager (ESI) on the Keck II 10-m telescope we have measured the redshifts of the host galaxies of gamma-ray bursts GRB 990506 and GRB 000418, z=1.30658 +/- 0.00004 and 1.1181 +/- 0.0001, respectively. Thanks to the excellent spectral resolution of ESI we resolved the [O II] 3727 doublet in both cases. The measured redshift of GRB 990506 is the highest known for a dark burst GRB, though entirely consistent with the notion that dark and non-dark bursts have a common progenitor origin. The relative strengths of the [O II], He I, [Ne III], and H gamma emission lines suggest that the host of GRB 000418 is a starburst galaxy, rather than a LINER or Seyfert 2. Since the host of GRB 000418 has been detected at sub-millimeter wavelengths these spectroscopic observations suggest that the sub-millimeter emission is due to star-formation (as opposed to AGN) activity. The [O II]-derived unobscured star-formation rates are 13 and 55 M_solar/yr for the hosts of GRB 990506 and GRB 000418, respectively. In contrast, the star-formation rate of the host of GRB 000418 derived from sub-millimeter observations is twenty times larger.

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