2011ApJ...739...98B

Query : 2011ApJ...739...98B

2011ApJ...739...98B - Astrophys. J., 739, 98 (2011/October-1)

A search for Lyman break galaxies in the Chandra deep field south using Swift Ultraviolet/Optical telescope.

BASU-ZYCH A.R., HORNSCHEMEIER A.E., HOVERSTEN E.A., LEHMER B. and GRONWALL C.

Abstract (from CDS):

While the Swift satellite is primarily designed to study gamma-ray bursts, its ultraviolet and optical imaging and spectroscopy capabilities are also being used for a variety of scientific programs. In this study, we use the UV/Optical Telescope (UVOT) instrument on board Swift to discover 0.5 < z < 2 Lyman break galaxies (LBGs). UVOT has covered ∼266 arcmin2 at >60 ks exposure time, achieving a limiting magnitude of u < 24.5, in the Chandra Deep Field South (CDF-S). Applying UVOT near-ultraviolet color selection, we select 50 UV-dropouts from this UVOT CDF-S data. We match the selected sources with available multiwavelength data from Great Observatories Origins Deep Survey (GOODS) South, Multiwavelength Survey by Yale-Chile, and COMBO-17 to characterize the spectral energy distributions for these galaxies and determine stellar masses, star formation rates (SFRs), and dust attenuations. We compare these properties for LBGs selected in this paper versus z ∼ 3 LBGs and other CDF-S galaxies in the same redshift range (0.5 < z < 2), identified using photometric redshift techniques. The z ∼ 1 LBGs have stellar masses of */M☉> = 9.4±0.6, which is slightly lower than z ∼ 3 LBGs (*/M☉> = 10.2±0.4) and slightly higher compared with the z ∼ 1 CDF-S galaxies (*/M☉> = 8.7±0.7). Similarly, our sample of z ∼ 1 LBGs has SFRs (derived using both ultraviolet and infrared data, where available) of ☉/yr)> = 0.7±0.6, nearly an order of magnitude lower than z ∼ 3 LBGs (☉/yr> = 1.5±0.4), but slightly higher than the comparison z ∼ 1 sample of CDF-S galaxies (☉/yr> = 0.2±0.7). We find that our z ∼ 1 UV-dropouts have FUV> = 2.0±1.0, which is higher than z ∼ 3 LBGs (FUV> = 1.0±0.5), but similar to the distribution of dust attenuations in the other CDF-S galaxies (FUV> ∼ 2.8 ± 1.5). Using the GOODS-South multiwavelength catalog of galaxies, we simulate a larger and fainter sample of LBGs to compare their properties with those of the UVOT-selected LBG sample. We conclude that UVOT can be useful for finding and studying the bright end of 0.5 < z < 2.0 LBGs.

Abstract Copyright: ∼

Journal keyword(s): galaxies: evolution - galaxies: starburst - methods: analytical - ultraviolet: galaxies

Nomenclature: Tables 1-2: [BHH2011] AA (Nos A-Z, AA-XX), [BHH2011] JHHMMSS.s+DDMMSS.s N=8.

Simbad objects: 61

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Number of rows : 61
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 VCDFS 23035 G 03 31 42.9209 -27 49 37.680   23.6542 23.8155 23.4838 23.6822 ~ 2 0
2 [BHH2011] R G 03 31 44.5 -27 50 21           ~ 1 0
3 [BHH2011] J033145.7-275003.5 UV 03 31 45.7 -27 50 03           ~ 1 0
4 VCDFS 19133 G 03 31 47.39 -27 52 19.0   23.9086 24.0178 23.8032 23.9384 ~ 5 0
5 [BHH2011] P G 03 31 49.0 -27 49 51           ~ 1 0
6 [BHH2011] H G 03 31 49.416 -27 44 56.03       22.79   ~ 2 0
7 [BHH2011] Z G 03 31 49.8 -27 54 41           ~ 1 0
8 [BHH2011] AA G 03 31 50.1 -27 55 06           ~ 1 0
9 VCDFS 15465 G 03 31 51.64 -27 54 53.9   23.3207 23.2807 23.3779 23.4247 ~ 6 0
10 [MBR2003] CDFS-H 2673 G 03 31 52.770 -27 49 28.48           ~ 3 0
11 [BHH2011] I G 03 31 57.1 -27 45 25           ~ 1 0
12 [BHH2011] BB G 03 31 58.7 -27 57 32           ~ 1 0
13 [BHH2011] N G 03 31 59.5 -27 50 20           ~ 1 0
14 GOODS J033200.44-275459.0 G 03 32 00.43874 -27 54 58.9565   23.9521 23.7185 23.842 23.6566 ~ 7 0
15 KGES 13 EmG 03 32 02.103 -27 52 42.27       23.57   ~ 4 0
16 [BHH2011] L G 03 32 02.2 -27 49 00           ~ 1 0
17 [BHH2011] W G 03 32 02.4 -27 53 33           ~ 1 0
18 GOODS J033203.17-274543.2 G 03 32 03.162 -27 45 43.23   22.748 22.88 23.169 20.904 ~ 14 0
19 [BHH2011] J033203.4-275059.5 UV 03 32 03.4 -27 51 00           ~ 1 0
20 [BHH2011] M G 03 32 04.2 -27 49 30           ~ 1 0
21 [BHH2011] J033206.8-274208.6 G 03 32 06.9 -27 42 09           ~ 1 0
22 [BHH2011] K G 03 32 07.0 -27 47 21           ~ 1 0
23 [BHH2011] J033207.4-274400.4 UV 03 32 07.4 -27 44 01           ~ 1 0
24 [BHH2011] CC G 03 32 11.7 -27 57 36           ~ 1 0
25 EIS-DEEP CDFS-3 J 1 44 EmG 03 32 14.9907 -27 53 02.408   23.1499 23.2445 23.1235 23.1482 ~ 15 0
26 EIS-DEEP CDFS-3 J 1 1023 G 03 32 15.26830 -27 50 39.3187   22.240 21.682 20.973   ~ 12 0
27 [BHH2011] J033215.3-275044.1 G 03 32 15.3 -27 50 44           ~ 1 0
28 [BHH2011] DD G 03 32 16.1 -27 57 03           ~ 1 0
29 ZFOURGE CDFS 4547 G 03 32 17.3062 -27 53 54.114           ~ 3 0
30 [BHH2011] F G 03 32 18.8 -27 45 00           ~ 1 0
31 [BHH2011] G G 03 32 19.8 -27 45 16           ~ 1 0
32 [BHH2011] SS G 03 32 20.9 -27 48 23           ~ 1 0
33 EIS-DEEP CDFS-3 J 1 733 EmG 03 32 21.09 -27 49 51.0   24.07   23.26 22.32 ~ 16 0
34 [BHH2011] KK G 03 32 23.9 -27 50 32           ~ 1 0
35 GOODS J033224.44-275034.1 G 03 32 24.4418 -27 50 34.085   24.0190   23.96 23.9006 ~ 13 0
36 [BHH2011] EE G 03 32 25.5 -27 57 06           ~ 1 0
37 GOODS J033226.81-274156.4 G 03 32 26.808 -27 41 56.61   23.0133   22.879 22.8038 ~ 15 0
38 [BHH2011] E G 03 32 26.9 -27 44 25           ~ 1 0
39 NAME Chandra Deep Field-South reg 03 32 28.0 -27 48 30           ~ 2282 1
40 NAME GOODS Southern Field reg 03 32 28.0 -27 48 30           ~ 1623 1
41 [BHH2011] C G 03 32 28.0 -27 42 50           ~ 1 0
42 EIS-DEEP CDFS-4 J 1 820 EmG 03 32 28.98574 -27 49 08.2135   22.016   22.736 21.032 ~ 29 0
43 GMASS 2540 G 03 32 30.343 -27 42 40.38   23.3125 23.22 23.234 23.0087 ~ 25 0
44 AUDFs F20208 G 03 32 30.750 -27 43 45.35   24.09 24.01     ~ 13 0
45 EIS-DEEP CDFS-4 H 1 970 EmG 03 32 31.4334 -27 51 37.445   24.0010     23.4638 ~ 17 0
46 GOODS J033232.05-275326.8 G 03 32 32.0470 -27 53 26.770   25.0496     24.1976 ~ 10 0
47 [BHH2011] TT G 03 32 34.7 -27 47 27           ~ 1 0
48 GOODS-MUSIC 7701 G 03 32 35.354 -27 49 20.73   24.573 24.407     ~ 2 0
49 [BHH2011] HH G 03 32 35.5 -27 54 47           ~ 1 0
50 ACS-GC 90042362 QSO 03 32 35.974 -27 48 50.40 24.39 22.3798 22.3070 22.413 21.847 ~ 60 0
51 [BHH2011] MM G 03 32 37.3 -27 50 13           ~ 1 0
52 [BHH2011] VV G 03 32 37.8 -27 46 42           ~ 1 0
53 EIS-DEEP CDFS-2 J 1 1033 EmG 03 32 38.501 -27 47 25.32 24.3298 24.0567 24.008     ~ 23 0
54 KGES 54 EmG 03 32 42.902 -27 55 11.94       23.77   ~ 8 0
55 EIS-DEEP CDFS-4 J 1 1502 EmG 03 32 44.9523 -27 50 05.319   24.2036 23.7280 23.8347 23.8394 ~ 21 0
56 GOODS J033246.21-274529.0 G 03 32 46.2125 -27 45 29.044   24.9564     24.4717 ~ 9 0
57 Anon J033246-2754 G 03 32 46.8938 -27 54 49.048   23.6195     23.3455 ~ 16 1
58 [BHH2011] XX G 03 32 53.2 -27 46 44           ~ 1 0
59 2MASS J03325466-2750084 * 03 32 54.6636809136 -27 50 08.477520864   20.98 19.90     ~ 3 0
60 [MBR2003] CDFS-H 3354 * 03 32 58.4478070320 -27 49 55.268553864   21.11 20.44     ~ 3 0
61 NAME MS 1512-cB58 AGN 15 14 22.2751 +36 36 25.674     20.64   20.35 ~ 326 0

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