2011ApJ...736...48R

Query : 2011ApJ...736...48R

2011ApJ...736...48R - Astrophys. J., 736, 48 (2011/July-3)

Star formation from DLA gas in the outskirts of Lyman break galaxies at z ∼ 3.

RAFELSKI M., WOLFE A.M. and CHEN H.-W.

Abstract (from CDS):

We present evidence for spatially extended low surface brightness emission around Lyman break galaxies (LBGs) in the V-band image of the Hubble Ultra Deep Field, corresponding to the z ∼ 3 rest-frame far-UV (FUV) light, which is a sensitive measure of star formation rates (SFRs). We find that the covering fraction of molecular gas at z ∼ 3 is not adequate to explain the emission in the outskirts of LBGs, while the covering fraction of neutral atomic-dominated hydrogen gas at high redshift is sufficient. We develop a theoretical framework to connect this emission around LBGs to the expected emission from neutral H I gas, i.e., damped Lyα systems (DLAs), using the Kennicutt-Schmidt (KS) relation. Working under the hypothesis that the observed FUV emission in the outskirts of LBGs is from in situ star formation in atomic-dominated hydrogen gas, the results suggest that the SFR efficiency in such gas at z ∼ 3 is between factors of 10 and 50 lower than predictions based on the local KS relation. The total SFR density in atomic-dominated gas at z ∼ 3 is constrained to be ∼10% of that observed from the inner regions of LBGs. In addition, the metals produced by in situ star formation in the outskirts of LBGs yield metallicities comparable to those of DLAs, which is a possible solution to the "Missing Metals" problem for DLAs. Finally, the atomic-dominated gas in the outskirts of galaxies at both high and low redshifts has similar reduced SFR efficiencies and is consistent with the same power law.

Abstract Copyright: ∼

Journal keyword(s): cosmology: observations - galaxies: evolution - galaxies: general - galaxies: high-redshift - galaxies: photometry - quasars: absorption lines

VizieR on-line data: <Available at CDS (J/ApJ/736/48): table1.dat>

Status at CDS : All or part of tables of objects could be ingested in SIMBAD with priority 2.

Simbad objects: 50

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Number of rows : 50
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 UDF 3922 EmG 03 32 29.423 -27 47 45.04   27.7466 26.4178     ~ 14 0
2 JADES-GS NC 205769 EmG 03 32 29.696 -27 47 13.71   26.3871       ~ 7 0
3 UDF 5750 G 03 32 30.220 -27 47 19.20   26.8618 26.7044     ~ 7 0
4 UDF 4766 G 03 32 30.743 -27 47 33.44   26.4428 26.2781     ~ 7 0
5 JADES-GS NC 122559 EmG 03 32 32.985 -27 47 06.84   27.4996 26.70     ~ 8 0
6 [CBS2006] 2595 G 03 32 33.843 -27 48 08.89   27.6128       ~ 5 0
7 UDF 3112 G 03 32 33.893 -27 47 58.45   26.2871 25.7658     ~ 9 0
8 MUSE-WIDE 601681607 EmG 03 32 34.011 -27 47 59.09   27.6268 26.7401     ~ 14 0
9 GOODS-MUSIC 10087 EmG 03 32 34.415 -27 47 16.81   27.0158 25.94     ~ 20 0
10 UDF 3198 G 03 32 34.418 -27 47 57.98   27.0841 26.876     ~ 7 0
11 UDF 9394 G 03 32 34.620 -27 46 08.62 27.3269 26.2312 25.7520     ~ 9 0
12 GOODS-MUSIC 9830 EmG 03 32 35.050 -27 47 29.72   27.3096 26.19     ~ 17 0
13 GOODS-MUSIC 9186 G 03 32 36.102 -27 48 01.97 28.5059 27.3216 26.72     ~ 9 0
14 GOODS-MUSIC 9776 G 03 32 36.740 -27 47 32.61 28.7289 27.7600 26.71     ~ 12 0
15 GOODS-MUSIC 9913 EmG 03 32 36.745 -27 47 25.81   28.1404 27.23     ~ 11 0
16 [CBS2006] 1414 G 03 32 36.849 -27 48 33.79   27.8674       ~ 5 0
17 UDF 9806 G 03 32 36.991 -27 45 34.83 27.0375 26.2572 26.0711     ~ 9 0
18 UDF 7610 G 03 32 37.152 -27 46 49.40 28.8596 27.4424 27.210     ~ 8 0
19 GOODS J033237.53-274756.3 G 03 32 37.524 -27 47 56.31 28.8481 25.8944 25.367 25.45   ~ 18 0
20 GOODS-MUSIC 10732 EmG 03 32 37.701 -27 46 48.97   27.5210 26.70     ~ 15 0
21 JADES-GS NC 195019 EmG 03 32 37.835 -27 49 29.92   27.3392 26.8649     ~ 8 0
22 [CBS2006] 9570 G 03 32 37.844 -27 45 57.79 27.9220 27.3191       ~ 5 0
23 UDF 1273 G 03 32 38.146 -27 48 37.98 28.9194 26.9443 26.238     ~ 8 0
24 UDF 7758 G 03 32 38.384 -27 46 45.81 29.0085 27.3991 27.09     ~ 9 0
25 UDF 3052 G 03 32 38.412 -27 48 00.16 27.7750 26.8864 26.97     ~ 8 0
26 GOODS-MUSIC 8742 G 03 32 38.854 -27 48 25.42 27.4152 26.2375 26.24     ~ 9 0
27 MUSE-WIDE 720650458 EmG 03 32 38.904 -27 46 21.23 28.3698 27.3638 27.474     ~ 10 0
28 CANDELS GDS F160W J033238.97-274617.7 EmG 03 32 38.974 -27 46 17.76   27.7190       ~ 10 0
29 NAME Hubble Ultra Deep Field reg 03 32 39.0 -27 47 29           ~ 1900 0
30 ZFOURGE CDFS 21529 G 03 32 39.240 -27 45 18.73   27.9324       ~ 7 0
31 MUSE-WIDE 720790600 EmG 03 32 39.580 -27 47 06.88   28.1838 27.524     ~ 9 0
32 UDF 1753 G 03 32 39.819 -27 48 25.29   28.9435 27.472     ~ 7 0
33 MUSE-WIDE 601091353 EmG 03 32 40.224 -27 46 28.99 28.8639 27.6200 26.93     ~ 13 0
34 GOODS J033240.30-274752.6 rG 03 32 40.296 -27 47 52.63 27.4823 26.0835 25.053 25.042   ~ 34 0
35 GOODS-MUSIC 9072 G 03 32 40.378 -27 48 08.70 27.8750 27.9289 26.90     ~ 9 0
36 UDF 6352 G 03 32 40.980 -27 47 09.58 28.6704 27.2037 26.975     ~ 6 0
37 JADES-GS NC 204096 EmG 03 32 40.989 -27 47 35.86 29.0474 27.0941 26.73     ~ 10 0
38 GOODS-MUSIC 9757 G 03 32 41.274 -27 47 33.42 28.7218 26.8201 26.66     ~ 10 0
39 MUSE-WIDE 125001001 EmG 03 32 41.398 -27 48 53.40   27.9085       ~ 6 0
40 GOODS-MUSIC 9938 EmG 03 32 42.758 -27 47 24.69   28.1644 27.04     ~ 18 0
41 JADES-GS NC 104652 EmG 03 32 43.312 -27 48 39.93   26.8668 26.5469     ~ 9 0
42 UDF 6595 G 03 32 43.355 -27 47 05.75 29.0280 27.8672 27.46     ~ 9 0
43 [CBS2006] 906 G 03 32 43.434 -27 48 51.33   27.4513       ~ 5 0
44 MUSE-WIDE 155004023 EmG 03 32 44.763 -27 47 40.66   28.2574 27.02     ~ 10 0
45 JADES-GS NC 113245 EmG 03 32 45.982 -27 47 53.20   27.6963       ~ 6 0
46 JADES-GS NS 50248 EmG 03 32 46.976 -27 46 57.78 28.8671 26.0989 25.1972     ~ 15 0
47 [BIO2015] GSDB-2470247571 G 03 32 47.020 -27 47 57.19   27.9696       ~ 7 0
48 [CBS2006] 5916 G 03 32 47.264 -27 47 16.20   27.3799       ~ 4 0
49 [RTG2015] 6359 G 03 32 47.649 -27 47 42.12   27.0692 26.9073     ~ 6 0
50 M 83 SBG 13 37 00.91920 -29 51 56.7400 8.85 8.11 7.52 7.21   ~ 2778 2

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