2011MNRAS.418.2074M

Query : 2011MNRAS.418.2074M

2011MNRAS.418.2074M - Mon. Not. R. Astron. Soc., 418, 2074-2105 (2011/December-2)

A robust sample of galaxies at redshifts 6.0<z<8.7: stellar populations, star formation rates and stellar masses.

McLURE R.J., DUNLOP J.S., DE RAVEL L., CIRASUOLO M., ELLIS R.S., SCHENKER M., ROBERTSON B.E., KOEKEMOER A.M., STARK D.P. and BOWLER R.A.A.

Abstract (from CDS):

We present the results of a photometric redshift analysis designed to identify z ≥ 6 galaxies from the near-infrared Hubble Space Telescope imaging in three deep fields [Hubble Ultra Deep Field (HUDF), HUDF09-2 and Early Release Science] covering a total area of 45 square arcmin. By adopting a rigorous set of criteria for rejecting low-redshift interlopers, and by employing a deconfusion technique to allow the available ultradeep IRAC imaging to be included in the candidate-selection process, we have derived a robust sample of 70 Lyman break galaxies (LBGs) spanning the redshift range 6.0 < z < 8.7. Based on our final sample, we investigate the distribution of ultraviolet (UV) spectral slopes (fλ∝λβ), finding a variance-weighted mean value of #946;=-2.05±0.09 which, contrary to some previous results, is not significantly bluer than displayed by lower redshift starburst galaxies. We confirm the correlation between UV luminosity and stellar mass reported elsewhere, but based on fitting galaxy templates featuring a range of star formation histories (SFHs), metallicities and reddening, we find that, at z ≥ 6, the range in mass-to-light ratio (M*/LUV) at a given UV luminosity could span a factor of ≃ 50. Focusing on a subsample of 21 candidates with IRAC detections at 3.6µm, we find that L* LBGs at z ≃ 6.5 have a median stellar mass of M*= (2.1±1.1) {x} 109 M☉ (Chabrier initial mass function) and a median specific star formation rate (sSFR) of 1.9±0.8/Gyr. Using the same subsample, we have investigated the influence of nebular continuum and line emission, finding that for the majority of candidates (16 out of 21), the best-fitting stellar masses are reduced by less than a factor of 2.5. However, galaxy template fits exploring a plausible range of SFHs and metallicities provide no compelling evidence of a clear connection between SFR and stellar mass at these redshifts. Finally, a detailed comparison of our final sample with the results of previous studies suggests that, at faint magnitudes, several high-redshift galaxy samples in the literature are significantly contaminated by low-redshift interlopers.

Abstract Copyright: 2011 The Authors Monthly Notices of the Royal Astronomical Society2011 RAS

Journal keyword(s): galaxies: evolution - galaxies: formation - galaxies: high-redshift

VizieR on-line data: <Available at CDS (J/MNRAS/418/2074): sample.dat table6.dat phot.dat>

Nomenclature: Table 2: [MDD2011] HUDF NNNN N=31 among (Nos 522-2836). Table 3: [MDD2011] ERS NNNNN N=25 among (Nos 3679-10288). Table 4: [MDD2011] HDF09-2 NNNN N=17 among (Nos 605-2814).

Simbad objects: 78

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Number of rows : 78
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 [BIO2015] ERSY-2029843519 G 03 32 02.986 -27 43 51.95           ~ 7 0
2 [BIO2015] ERSI-2037644544 G 03 32 03.77 -27 44 54.4         27.95 ~ 4 0
3 [BIO2011] ERSz-2068244221 G 03 32 06.83 -27 44 22.2         27.42 ~ 7 0
4 [BIO2015] ERSI-2078642177 G 03 32 07.86 -27 42 17.8         27.27 ~ 5 0
5 [GFG2013b] 21921 G 03 32 09.85 -27 43 24.0           ~ 6 0
6 [MDD2011] ERS 7672 G 03 32 10.03 -27 45 24.6           ~ 1 0
7 [MDD2011] ERS 9923 G 03 32 10.06 -27 45 22.6           ~ 1 0
8 [MDD2011] ERS 7236 G 03 32 11.51 -27 45 17.1           ~ 1 0
9 [BIO2011] ERSz-2153943286 EmG 03 32 15.40 -27 43 28.6         27.52 ~ 6 0
10 [BIO2015] ERSI-2160043014 EmG 03 32 16.00 -27 43 01.4         27.68 ~ 11 0
11 [BIO2011] ERSz-2160041591 G 03 32 16.01 -27 41 59.0           ~ 9 0
12 [BIO2011] ERSz-2161941497 G 03 32 16.19 -27 41 49.8           ~ 8 0
13 [BIO2011] ERSz-2202443342 G 03 32 20.24 -27 43 34.3         27.87 ~ 6 0
14 HRG14 J033222.66-274300.6 G 03 32 22.66 -27 43 00.7         27.28 ~ 18 0
15 [WBL2011] ERS z 87326 G 03 32 23.15 -27 42 04.7           ~ 5 0
16 [BIO2015] ERSY-2233643265 G 03 32 23.369 -27 43 26.53           ~ 5 0
17 ZFOURGE CDFS 27453 G 03 32 24.09 -27 42 13.9           ~ 13 0
18 JADES-GS+053.10538-27.72347 EmG 03 32 25.28 -27 43 24.2           ~ 10 0
19 [BIB2006] CDFS-2279641190 G 03 32 27.96 -27 41 19.0         27.63 ~ 6 0
20 [BIO2011] ERSz-2295342044 G 03 32 29.54 -27 42 04.5           ~ 16 0
21 [BIO2015] ERSI-2296940498 G 03 32 29.69 -27 40 49.9           ~ 8 0
22 NAME Extended Chandra Deep Field South reg 03 32 30.0 -27 48 20           ~ 862 0
23 [MDD2011] ERS 7475 G 03 32 32.81 -27 42 38.5           ~ 1 0
24 JADES-GS+053.13806-27.78186 EmG 03 32 33.128 -27 46 54.41           ~ 16 0
25 [BIB2006] CDFS-2347540351 G 03 32 34.75 -27 40 35.1         27.25 ~ 6 0
26 JADES-GS NC 117868 EmG 03 32 35.045 -27 47 25.82     31.807   29.03 ~ 9 0
27 JADES-GS NC 203787 EmG 03 32 35.056 -27 47 40.19     30.59   27.83 ~ 17 0
28 [BIO2015] ERSY-2354441327 G 03 32 35.44 -27 41 32.7           ~ 7 0
29 [MDD2011] ERS 7225 G 03 32 36.31 -27 40 15.0           ~ 1 0
30 JADES-GS+053.15160-27.78791 EmG 03 32 36.378 -27 47 16.23         29.18 ~ 19 0
31 GOODS-MUSIC 10898 EmG 03 32 36.470 -27 46 41.44   29.56 31.02   26.54 ~ 25 0
32 JADES-GS+053.15218-27.77840 EmG 03 32 36.519 -27 46 41.98         29.37 ~ 7 0
33 [MDD2011] HUDF 1344 G 03 32 36.63 -27 47 50.1         27.85 ~ 2 0
34 [MDD2011] HUDF 2622 G 03 32 36.64 -27 47 50.2         28.45 ~ 2 0
35 [BIB2006] HUDF-36777536 G 03 32 36.773 -27 47 53.59         28.98 ~ 17 0
36 JADES-GS+053.15508-27.80178 EmG 03 32 37.214 -27 48 06.13           ~ 31 0
37 JADES-GS+053.15603-27.78098 G 03 32 37.443 -27 46 51.26         29.10 ~ 15 0
38 JADES-GS+053.15613-27.77584 EmG 03 32 37.464 -27 46 32.79   30.4935 29.65   27.72 ~ 19 0
39 [FPG2010] 2644 G 03 32 37.797 -27 47 40.44         29.18 ~ 6 0
40 JADES-GS+053.15891-27.76508 EmG 03 32 38.134 -27 45 54.01           ~ 33 0
41 [BWE2010] zD11 G 03 32 38.359 -27 46 11.87           ~ 12 0
42 FIGS GS1 2077 EmG 03 32 38.805 -27 47 07.15     31.6     ~ 40 0
43 NAME Hubble Ultra Deep Field reg 03 32 39.0 -27 47 29           ~ 1900 0
44 JADES-GS+053.16483-27.78826 EmG 03 32 39.555 -27 47 17.49   30.3455       ~ 23 0
45 [BIO2011] UDFz-39576564 G 03 32 39.581 -27 46 56.48   30.3656     29.29 ~ 15 0
46 JADES-GS+053.16556-27.77266 EmG 03 32 39.728 -27 46 21.33   31.1568       ~ 18 0
47 [BIB2006] HUDF-39796337 G 03 32 39.790 -27 46 33.75         29.10 ~ 10 0
48 JADES-GS+053.16904-27.77884 EmG 03 32 40.566 -27 46 43.55   31.0031     29.57 ~ 36 0
49 [BIO2011] UDFz-41597044 G 03 32 41.597 -27 47 04.47         29.18 ~ 10 0
50 [BIO2011] UDFz-41826112 EmG 03 32 41.823 -27 46 11.24         29.79 ~ 14 0
51 JADES-GS+053.17582-27.77446 EmG 03 32 42.191 -27 46 27.82         28.77 ~ 22 0
52 UDF 34987 G 03 32 42.562 -27 46 56.61         28.13 ~ 44 0
53 [BIO2015] XDFY-2428746345 G 03 32 42.878 -27 46 34.51           ~ 14 0
54 MUSE-WIDE 613754278 EmG 03 32 43.026 -27 46 23.65         28.03 ~ 12 0
55 JADES-GS NC 130123 EmG 03 32 43.137 -27 46 28.47           ~ 16 0
56 [BIB2006] HUDF-43786337 G 03 32 43.784 -27 46 33.71         29.16 ~ 12 0
57 [BIO2011] UDFz-44306452 G 03 32 44.308 -27 46 45.16         28.89 ~ 11 0
58 JADES-GS NC 127088 EmG 03 32 44.702 -27 46 44.29           ~ 24 0
59 [BIO2011] UDF092z-01101160 G 03 33 01.10 -27 51 16.0         27.65 ~ 5 0
60 [BIO2015] HUDF092Z-3011751138 G 03 33 01.17 -27 51 13.9         28.75 ~ 4 0
61 [BIO2015] HUDF092I-3011851222 G 03 33 01.18 -27 51 22.3         27.08 ~ 4 0
62 [BIO2015] HUDF092I-3011951133 G 03 33 01.19 -27 51 13.3         28.90 ~ 6 0
63 [BIO2015] HUDF092I-3019552032 G 03 33 01.95 -27 52 03.2         28.20 ~ 7 0
64 [BIO2011] UDF092y-03751196 G 03 33 03.76 -27 51 19.7           ~ 11 0
65 [BIO2011] UDF092y-03781204 G 03 33 03.79 -27 51 20.4           ~ 13 0
66 [MDD2011] HUDF09-2 2587 G 03 33 04.20 -27 50 31.3         27.47 ~ 3 0
67 [BIO2011] UDF092y-04640529 G 03 33 04.64 -27 50 53.0           ~ 8 0
68 [BIO2015] HUDF092Z-3054051189 G 03 33 05.40 -27 51 18.8           ~ 8 0
69 [MDD2011] HUDF09-2 2459 G 03 33 06.30 -27 50 20.2         27.88 ~ 3 0
70 [MDD2011] HUDF09-2 2613 G 03 33 06.52 -27 50 34.6         27.92 ~ 3 0
71 [MDD2011] HUDF09-2 2638 G 03 33 06.65 -27 50 30.2         28.50 ~ 3 0
72 [MDD2011] HUDF09-2 2814 G 03 33 07.05 -27 50 55.5           ~ 1 0
73 [BIO2011] UDF092y-07580550 G 03 33 07.58 -27 50 55.0           ~ 9 0
74 [BIO2011] UDF092z-09151554 G 03 33 09.15 -27 51 55.4           ~ 11 0
75 [BIO2015] HUDF092Z-3096550507 G 03 33 09.65 -27 50 50.8         28.17 ~ 6 0
76 NAME COSMOS Field reg 10 00 28.60 +02 12 21.0           ~ 3639 0
77 NAME GOODS-N Field reg 12 36 55.0 +62 14 15           ~ 1364 1
78 NAME Extended Groth Strip reg 14 19 +52.8           ~ 1023 0

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