2006A&A...460L..13J


Query : 2006A&A...460L..13J

2006A&A...460L..13J - Astronomy and Astrophysics, volume 460, L13-17 (2006/12-3)

HI column densities of z > 2 Swift gamma-ray bursts.

JAKOBSSON P., FYNBO J.P.U., LEDOUX C., VREESWIJK P., KANN D.A., HJORTH J., PRIDDEY R.S., TANVIR N.R., REICHART D., GOROSABEL J., KLOSE S., WATSON D., SOLLERMAN J., FRUCHTER A.S., DE UGARTE POSTIGO A., WIERSEMA K., BJOERNSSON G., CHAPMAN R., THOENE C.C., PEDERSEN K. and JENSEN B.L.

Abstract (from CDS):

Before the launch of the Swift satellite, the majority of the gamma-ray burst (GRB) afterglows for which Lyα was redshifted into the observable spectrum showed evidence for a damped Lyα absorber. This small sample indicated that GRBs explode either in galaxies, or regions within them, having high neutral hydrogen column densities. To increase the spectroscopic sample of GRBs with z>2 and hence establish the N(HI) distribution along GRB lines-of-sight. We have obtained six z>2 GRB afterglow spectra and fitted the Lyα absorption line in each case to determine N(HI). This has been complemented with 12 other Swift N(HI) values from the literature. We show that the peak of the GRB N(HI) distribution is qualitatively consistent with a model where GRBs originate in Galactic-like molecular clouds. However, a systematic difference, in particular an excess of low column-density systems compared to the predictions, indicates that selection effects and conditions within the cloud (e.g. strong ionization) influence the observed N(HI) range. We also report the discovery of Lyα emission from the GRB060714 host, corresponding to a star-formation rate of approximately 0.8M/yr. Finally, we present accurate redshifts of the six bursts: z=3.240±0.001 (GRB050319), z=2.198±0.002 (GRB050922C), z=3.221±0.001 (GRB060526), z=3.425±0.002 (GRB060707), z=2.711±0.001 (GRB060714) and z=3.686±0.002 (GRB060906).

Abstract Copyright:

Journal keyword(s): gamma rays: bursts - galaxies: high-redshift - galaxies: abundances - dust, extinction

Simbad objects: 27

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Number of rows : 27
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2022
#notes
1 GRB 050904 gB 00 54 50.794 +14 05 09.42           ~ 449 0
2 GRB 050908 gB 01 21 50.750 -12 57 17.20           ~ 165 0
3 GRB 060908 gB 02 07 18.360 +00 20 31.20 16.99 18.34 16.85     ~ 189 0
4 GRB 050603 gB 02 39 56.839 -25 10 54.92     18.48     ~ 154 0
5 GRB 060906 gB 02 43 00.900 +30 21 42.12     19.84     ~ 128 0
6 GRB 060115 gB 03 36 08.400 +17 20 43.00           ~ 159 0
7 GRB 060223 gB 03 40 52.0 -17 08 19           ~ 25 0
8 GRB 060210 gB 03 50 57.370 +27 01 34.40   20.27       ~ 242 0
9 GRB 060124 gB 05 08 25.900 +69 44 26.98   18.91 17.35     ~ 248 0
10 NAME LMC G 05 23 34.6 -69 45 22     0.4     ~ 15993 1
11 GRB 050505 gB 09 27 03.300 +30 16 23.70     20.74     ~ 183 0
12 GRB 050319 gB 10 16 47.900 +43 32 53.80   18.02 17.01     ~ 247 0
13 GRB 060206 gB 13 31 43.420 +35 03 03.60   19.99 17.09     ~ 299 0
14 GRB 050730 gB 14 08 17.090 -03 46 18.90   20.32 17.68     ~ 297 0
15 GRB 060714 gB 15 11 26.450 -06 33 58.30   20.21 18.54     ~ 180 0
16 GRB 060526 gB 15 31 18.360 +00 17 04.90   18.31 17.16     ~ 252 0
17 GRB 060510B gB 15 56 29.200 +78 34 12.00           ~ 137 0
18 GRB 050401 gB 16 31 28.84 +02 11 14.5           ~ 320 0
19 GRB 060926 gB 17 35 43.660 +13 02 18.60     19.36     ~ 124 0
20 GRB 050922C gB 21 09 33.000 -08 45 30.10 15.15 15.86 14.69     ~ 268 0
21 GRB 060605 gB 21 28 37.320 -06 03 31.30   20.12 16.53     ~ 182 0
22 GRB 060522 gB 21 31 44.850 +02 53 10.80           ~ 123 0
23 GRB 060927A gB 21 58 11.930 +05 21 50.32           ~ 183 0
24 GRB 060607 gB 21 58 50.400 -22 29 46.70 18.49 16.67 15.09     ~ 279 0
25 GRB 051109 gB 22 01 11.0 +40 50 15           ~ 33 0
26 GRB 050820A gB 22 29 38.110 +19 33 37.10 18.33 19.00 18.47     ~ 363 0
27 GRB 060707 gB 23 48 19.000 -17 54 17.00     19.79     ~ 149 0

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2022.05.24-04:26:15

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