Savaglio, S. 2011 GRB 090323余辉的谱

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通过余辉的谱，看到了两个路上的星系的吸收线。

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Title:		Supersolar metal abundances in two galaxies at z ˜ 3.57 revealed by the GRB 090323 afterglow spectrum
Authors:		Savaglio, S.; Rau, A.; Greiner, J.; Krühler, T.; McBreen, S.; Hartmann, D. H.; Updike, A. C.; Filgas, R.; Klose, S.; Afonso, P.;Clemens, C.; Küpcü Yoldaş, A.; Olivares E., F.; Sudilovsky, V.; Szokoly, G.
Affiliation:		AA(Max Planck Institute for Extraterrestrial Physics, 85748 Garching bei München, Germany), AB(Max Planck Institute for Extraterrestrial Physics, 85748 Garching bei München, Germany), AC(Max Planck Institute for Extraterrestrial Physics, 85748 Garching bei München, Germany), AD(Max Planck Institute for Extraterrestrial Physics, 85748 Garching bei München, Germany; Physics Department, Technische Universität München, James Franck Str., 85748 Garching, Germany; Dark Cosmology Centre, Niels Bohr Institute, University of Copenhagen, Juliane Maries Vej 30, 2100 Copenhagen, Denmark), AE(Max Planck Institute for Extraterrestrial Physics, 85748 Garching bei München, Germany; School of Physics, Science Center North, University College Dublin, Belfield, Dublin 4, Ireland), AF(Department of Physics and Astronomy Clemson, Clemson University, SC 29634, USA), AG(Department of Physics and Astronomy Clemson, Clemson University, SC 29634, USA), AH(Max Planck Institute for Extraterrestrial Physics, 85748 Garching bei München, Germany), AI(Thüringer Landessternwarte Tautenburg, Sternwarte 5, 07778 Tautenburg, Germany), AJ(Max Planck Institute for Extraterrestrial Physics, 85748 Garching bei München, Germany), AK(Max Planck Institute for Extraterrestrial Physics, 85748 Garching bei München, Germany), AL(European Southern Observatory, 85748 Garching bei München, Germany), AM(Max Planck Institute for Extraterrestrial Physics, 85748 Garching bei München, Germany), AN(Max Planck Institute for Extraterrestrial Physics, 85748 Garching bei München, Germany; Physics Department, Technische Universität München, James Franck Str., 85748 Garching, Germany), AO(Max Planck Institute for Extraterrestrial Physics, 85748 Garching bei München, Germany; Eötvös University, 1117 Budapest, Pazmany P.stny. 1/A, Hungary)
Publication:		Monthly Notices of the Royal Astronomical Society, Volume 420, Issue 1, pp. 627-636. (MNRAS Homepage)
Publication Date:		02/2012
Origin:		WILEY
Astronomy Keywords:		gamma-ray burst: individual: GRB 090323, galaxies: ISM, cosmology: observations
Abstract Copyright:		© 2011 The Authors Monthly Notices of the Royal Astronomical Society © 2011 RAS
DOI:		10.1111/j.1365-2966.2011.20074.x
Bibliographic Code:		2012MNRAS.420..627S

Abstract

We report on the surprisingly high metallicity measured in two absorption systems at high redshift, detected in the Very Large Telescope spectrum of the afterglow of the gamma-ray burst (GRB) GRB 090323. The two systems, at redshift z= 3.5673 and 3.5774 (separation Δv≈ 660 km s^-1), are dominated by the neutral gas in the interstellar medium of the parent galaxies. From the singly ionized zinc and sulphur, we estimate oversolar metallicities of [Zn/H] =+0.29 ± 0.10 and [S/H] = +0.67 ± 0.34, in the blue and red absorber, respectively. These are the highest metallicities ever measured in galaxies at z > 3. We propose that the two systems trace two galaxies in the process of merging, whose star formation and metallicity are heightened by the interaction. This enhanced star formation might also have triggered the birth of the GRB progenitor. As typically seen in star-forming galaxies, the fine-structure absorption Si II* is detected, both in z= 3.5774 ± 0.0005 and 3.5673 ± 0.0003. From the rest-frame ultraviolet emission in the GRB location, we derive a relatively high, not corrected for dust extinction, star formation rate ≈6 M_sun yr^-1. These properties suggest a possible connection between some high-redshift GRB host galaxies and high-z massive submillimetre galaxies, which are characterized by disturbed morphologies and high metallicities. Our result provides additional evidence that the dispersion in the chemical enrichment of the Universe at high redshift is substantial, with the existence of very metal-rich galaxies less than two billion years after the big bang. Partly based on observations collected at the European Southern Observatory under ESO proposal No. 082.A-0693.

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