2002A&A...388..425F


Query : 2002A&A...388..425F

2002A&A...388..425F - Astronomy and Astrophysics, volume 388, 425-438 (2002/6-3)

Deep Lyα imaging of two z = 2.04 GRB host galaxy fields.

FYNBO J.P.U., MOLLER P., THOMSEN B., HJORTH J., GOROSABEL J., ANDERSEN M.I., EGHOLM M.P., HOLLAND S., JENSEN B.L., PEDERSEN H. and WEIDINGER M.

Abstract (from CDS):

We report on the results of deep narrow-band Lyα and broad-band U and I imaging of the fields of two Gamma-Ray bursts at redshift z=2.04 (GRB 000301C and GRB 000926). We find that the host galaxy of GRB 000926 is an extended (more than 2 arcsec), strong Lyα emitter with a rest-frame equivalent width of 71+20–15Å. The galaxy consists of two main components and several fainter knots. GRB 000926 occurred in the western component, whereas most of the Lyα luminosity (about 65%) originates in the eastern component. Using archival HST images of the host galaxy we measure the spectral slopes (fλ ∝λβ) of the two components to β=-2.4±0.3 (east) and -1.4±0.2 (west). This implies that both components contain at most small amounts of dust, consistent with the observed strong Lyα emission. The western component has a slightly redder V-I colour than the eastern component, suggesting the presence of at least some dust. We do not detect the host galaxy of GRB 000301C in neither Lyα emission nor in U and I broad-band images. The strongest limit comes from combining the narrow and U-band imaging where we infer a limit of U(AB)>27.7 (2σ limit per arcsec2). The upper limits on the Lyα flux implies a Lyα equivalent width upper limit of ∼150Å. We find eleven and eight other galaxies with excess emission in the narrow filter in the fields of GRB 000301C and GRB 000926 respectively. These galaxies are candidate Lyα emitting galaxies in the environment of the host galaxies. Based on these detections we conclude that GRB 000926 occurred in one of the strongest centres of star formation within several Mpc, whereas GRB 000301C occurred in an intrinsically very faint galaxy far from being the strongest centre of star formation in its galactic environment. Under the hypothesis that GRBs trace star formation, the wide range of GRB host galaxy luminosities implies a very steep faint end slope of the high redshift galaxy luminosity function.

Abstract Copyright:

Journal keyword(s): cosmology: observations - gamma rays: bursts

Nomenclature: Tables 2, 3, Fig.5: [FMT2002] 301-NN N=11, [FMT2002] 926-N N=8.

Simbad objects: 16

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Number of rows : 16
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 000131 gB 06 13 31.08 -51 56 41.7     24.7     ~ 162 1
2 GRB 980326 gB 08 36 34.3 -18 51 24           ~ 259 0
3 NAME Spiderweb Galaxy AGN 11 40 48.3 -26 29 09     22.00     ~ 265 1
4 QSO B1205-30 QSO 12 08 12.7512120024 -30 31 07.589941104     18.13     ~ 25 0
5 GRB 990308 gB 12 23 11.44 +06 44 05.1           ~ 44 1
6 BD+25 2534 HS* 12 37 23.5161671712 +25 03 59.867922240 9.117 10.26 10.59 10.642 10.809 sdB1(k) 224 0
7 BD+18 2647 HS* 12 41 51.7899961800 +17 31 19.750566756 10.261 11.70 11.63 11.969 12.159 sdOpec 170 1
8 GRB 990510 gB 13 38 07.64 -80 29 48.8           ~ 477 1
9 BD+33 2642 pA* 15 51 59.8854348048 +32 56 54.329485272 9.806 10.61 10.73 10.884 10.961 O7p 398 0
10 GRB 000301C gB 16 20 18.5 +29 26 35           ~ 347 0
11 GRB 000926 gB 17 04 15 +51 46.0           ~ 351 0
12 SN 1998bw SN* 19 35 03.17 -52 50 46.1   14.09       SNIc 1725 2
13 BD+25 4655 HS* 21 59 41.9748629928 +26 25 57.403455672 8.27 9.39 9.68     sdO6 108 0
14 GRB 990712 gB 22 31 53.061 -73 24 28.58           ~ 255 1
15 GRB 980703 gB 23 59 06.7 +08 35 07           ~ 431 1
16 OT 20000926 ? ~ ~           ~ 2 0

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2022.05.28-22:05:06

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