2009ApJ...691..152C

Query : 2009ApJ...691..152C

2009ApJ...691..152C - Astrophys. J., 691, 152-174 (2009/January-3)

High-redshift starbursting dwarf galaxies revealed by γ-ray burst afterglows.

CHEN H.-W., PERLEY D.A., POLLACK L.K., PROCHASKA J.X., BLOOM J.S., DESSAUGES-ZAVADSKY M., PETTINI M., LOPEZ S., DALL'AGLIO A. and BECKER G.D.

Abstract (from CDS):

We present a study of 15 long-duration γ-ray burst (GRB) host galaxies at z > 2. The GRBs are selected with available early-time afterglow spectra in order to compare interstellar medium (ISM) absorption-line properties with stellar properties of the host galaxies. In addition to five previously studied hosts, we consider new detections for the host galaxies of GRB 050820 and GRB 060206, and place 2σ upper limits to the luminosities of the remaining unidentified hosts. We examine the nature of the host galaxy population and find that (1) the UV luminosity distribution of GRB host galaxies is consistent with expectations from a UV luminosity weighted random galaxy population with a median luminosity of = 0.1 L*, (2) there exists a moderate correlation between UV luminosity and Si II λ 1526 absorption width, which together with the observed large line widths of W(1526)>1.5 Å for a large fraction of the objects suggests a galactic outflow driven velocity field in the host galaxies, (3) there is tentative evidence for a trend of declining ISM metallicity with decreasing galaxy luminosity in the star-forming galaxy population at z = 2-4, (4) the interstellar UV radiation field is found to be 35-350x higher in GRB hosts than the Galactic mean value, and (5) additional galaxies are found at ≲2'' from the GRB host in all fields with known presence of strong Mg II absorbers, but no additional faint galaxies are found at ≲2'' in fields without strong Mg II absorbers. Our study confirms that the GRB host galaxies (with known optical afterglows) are representative of unobscured star-forming galaxies at z > 2, and demonstrates that high spatial resolution images are necessary for an accurate identification of GRB host galaxies in the presence of strong intervening absorbers.

Abstract Copyright: ∼

Journal keyword(s): gamma rays: bursts - intergalactic medium - ISM: abundances - ISM: kinematics and dynamics

CDS comments: GRB 00096, GRB 030349 and GRB 070530 are misprints for GRB 000926, GRB 030429 and GRB 050730 respectively.

Simbad objects: 28

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Number of rows : 28
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2026 		#notes
1 GRB 021004 gB 00 26 54.68 +18 55 41.6           ~ 560 0
2 NAME Magellanic Stream HVC 00 32 -30.0           ~ 1079 1
3 NAME SMC G 00 52 38.0 -72 48 01   2.79 2.2     ~ 12317 1
4 GRB 050908 gB 01 21 50.750 -12 57 17.20           ~ 179 0
5 GRB 070721B gB 02 12 32.98 -02 11 39.8           ~ 128 0
6 GRB 070802 gB 02 27 35.91 -55 31 39.1           ~ 168 0
7 NAME Magellanic Clouds GrG 03 00 -71.0           ~ 7988 0
8 NAME Hubble Ultra Deep Field reg 03 32 39.0 -27 47 29           ~ 1900 0
9 NAME LMC G 05 23 34.6 -69 45 22     0.4     ~ 19090 0
10 GRB 020124 gB 09 32 50.8 -11 31 11           ~ 155 0
11 Mrk 116 AGN 09 34 02.1 +55 14 25           ~ 1179 1
12 GRB 030323 gB 11 06 09.4 -21 46 13           ~ 138 1
13 [VWR2003] GRB 030323 abs 3.372 G 11 06 09.4 -21 46 13           ~ 13 1
14 GRB 011211 gB 11 15 16 -21 56.0           ~ 305 0
15 [FJM2003] S1211-6 G 11 15 17.98 -21 56 56.2           ~ 16 0
16 GRB 030429 gB 12 13 07.495 -20 54 49.54     23.70     ~ 132 0
17 GRB 060206 gB 13 31 43.420 +35 03 03.60   19.99 17.09     ~ 330 0
18 GRB 050730 gB 14 08 17.090 -03 46 18.90   20.32 17.68     ~ 327 0
19 GRB 060526 gB 15 31 18.360 +00 17 04.90   18.31 17.16     ~ 288 0
20 SBSG 1543+593 LSB 15 44 20.30 +59 12 24.2   17.5 16.9     ~ 55 2
21 GRB 060418 gB 15 45 42.600 -03 38 20.00 15.73 16.19 14.98     ~ 389 0
22 GRB 000301C gB 16 20 18.5 +29 26 35           ~ 361 0
23 GRB 050401 gB 16 31 28.84 +02 11 14.5           ~ 348 0
24 [FGD2001] GRB 000926 Host G G 17 04 09.8 +51 47 11           ~ 11 1
25 GRB 000926 gB 17 04 15 +51 46.0           ~ 373 0
26 GRB 050922C gB 21 09 33.000 -08 45 30.10 15.15 15.86 14.69     ~ 301 0
27 GRB 060607 gB 21 58 50.400 -22 29 46.70 18.49 16.67 15.09     ~ 318 0
28 GRB 050820A gB 22 29 38.110 +19 33 37.10 18.33 19.00 18.47     ~ 409 0

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