A redshift determination of the host galaxy

Urata, Y. and Yoshida, A. and Yamada, T. and Kosugi, G. and Totani, T. and Komiyama, Y. and Kobayashi, N. and Tamagawa, T. and Kawai, N. and Takata, T. and Mizumoto, Y. and Huang, K. Y. and Ip, W. H. and Makishima, K. (2005) A redshift determination of the host galaxy. Il nuovo cimento C, 28 (4\5). pp. 697-700. ISSN 1826-9885

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Using the Suprime-Cam on the Subaru telescope, we carried out deep multi band (V,R, I, z) imaging for the host galaxy of GRB980329, which is one of well studied “optically dark” gamma-ray bursts. The host galaxy was detected clearly in all bands. Combining these measurements with published near-infrared data, we determined the photometric redshift of the galaxy as z = 3.56 (3.21–3.79 at 90 range). The implied V -band extinction is rather low, typically ∼ 1 mag. At z = 3.56, the isotropic 40–700 keV total energy of GRB980329 is calculated as (2.1 ± 0.4) × 1054 erg. Assuming that this GRB was emitted by a pair of jets with a total energy of 1051 ergs, their opening angle is calculated as θj = 2.1. The present results disfavor the high-redshift hypothesis and the high extinction scenario of optically dark bursts.

Item Type: Article
Additional Information: Paper presented at the “4th Workshop on Gamma-Ray Burst in the Afterglow Era”, Rome, October 18-22, 2004.
Uncontrolled Keywords: Ground-based ultraviolt, optical and infrared telescopes ; γ-ray source; γ-ray bursts
Subjects: 500 Scienze naturali e Matematica > 520 Astronomia e scienze connesse
Depositing User: Marina Spanti
Date Deposited: 17 Mar 2020 13:38
Last Modified: 17 Mar 2020 13:38
URI: http://eprints.bice.rm.cnr.it/id/eprint/15855

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