2006A&A...451L..47F


C.D.S. - SIMBAD4 rel 1.7 - 2020.07.10CEST05:27:19

2006A&A...451L..47F - Astronomy and Astrophysics, volume 451, L47-50 (2006/6-1)

Probing cosmic chemical evolution with gamma-ray bursts: GRB 060206 at z = 4.048.

FYNBO J.P.U., STARLING R.L.C., LEDOUX C., WIERSEMA K., THOENE C.C., SOLLERMAN J., JAKOBSSON P., HJORTH J., WATSON D., VREESWIJK P.M., MOLLER P., ROL E., GOROSABEL J., NAERAENEN J., WIJERS R.A.M.J., BJOERNSSON G., CASTRO CERON J.M., CURRAN P., HARTMANN D.H., HOLLAND S.T., JENSEN B.L., LEVAN A.J., LIMOUSIN M., KOUVELIOTOU C., NELEMANS G., PEDERSEN K., PRIDDEY R.S. and TANVIR N.R.

Abstract (from CDS):

We present early optical spectroscopy of the afterglow of the gamma-ray burst GRB060206 with the aim of determining the metallicity of the GRB absorber and the physical conditions in the circumburst medium. We also discuss how GRBs may be important complementary probes of cosmic chemical evolution. Absorption line study of the GRB afterglow spectrum. We determine the redshift of the GRB to be z=4.04795±0.00020. Based on the measurement of the neutral hydrogen column density from the damped Lyman-α line and the metal content from weak, unsaturated Sii lines we derive a metallicity of [S/H]=-0.84±0.10. This is one of the highest metallicities measured from absorption lines at z∼4. From the very high column densities for the forbidden SiII*, OI*, and OI** lines we infer very high densities and low temperatures in the system. There is evidence for the presence of H2 molecules with log N(H2)∼17.0, translating into a molecular fraction of logf≃-3.5 with f=2N(H2)/(2N(H2)+N(HI)). Even if GRBs are only formed by single massive stars with metallicities below ∼0.3Z, they could still be fairly unbiased tracers of the bulk of the star formation at z>2. Hence, metallicities as derived for GRB060206 here for a complete sample of GRB afterglows will directly show the distribution of metallicities for representative star-forming galaxies at these redshifts.

Abstract Copyright:

Journal keyword(s): gamma rays: bursts - galaxies: high-redshift - galaxies: abundances - cosmology: observations

Nomenclature: Text: [FSL2006] GRB 060206 abs N.NN N=2.

Simbad objects: 18

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Number of rows : 18

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
#notes
1 GRB 050904 gB 00 54 50.794 +14 05 09.42           ~ 431 1
2 [KKA2006] GRB 050904 abs 6.295 G 00 54 50.88 +14 05 09.9           ~ 7 1
3 [BPC2006] GRB 050505 abs 4.2748 G 09 27 03.19 +30 16 22.7           ~ 3 1
4 GRB 050505 gB 09 27 03.300 +30 16 23.70     20.74     ~ 170 1
5 GRB 030323 gB 11 06 09.4 -21 46 13           ~ 125 1
6 [VWR2003] GRB 030323 abs 3.372 G 11 06 09.4 -21 46 13           ~ 13 1
7 GRB 011211 gB 11 15 16 -21 56.0           ~ 285 1
8 [FJM2003] S1211-6 G 11 15 17.98 -21 56 56.2           ~ 16 1
9 GRB 060206 gB 13 31 43.420 +35 03 03.60   19.99 17.09     ~ 282 1
10 GRB 050730 gB 14 08 17.090 -03 46 18.90   20.32 17.68     ~ 282 1
11 [CPB2005] host G G 14 08 17.14 -03 46 17.8           ~ 8 1
12 [FJH2005] GRB 050401 abs 2.90 G 16 31 28.81 +02 11 14.2           ~ 5 0
13 [CDK2000] GRB 000926 abs 2.0369 G 17 04 09.8 +51 47 11           ~ 11 1
14 GRB 000926 gB 17 04 15 +51 46.0           ~ 341 2
15 SN 1998bw SN* 19 35 03.17 -52 50 46.1   14.09       SNIc 1650 2
16 GRB 050820A gB 22 29 38.110 +19 33 37.10 18.33 19.00 18.47     ~ 338 1
17 [PBW2005] GRB 050820 abs 2.612 G 22 29 38.16 +19 33 35.1           ~ 6 1
18 [FLC2006b] GRB 060206 abs 4.045 G ~ ~           ~ 7 1

    Equat.    Gal    SGal    Ecl

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2020.07.10-05:27:19

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