2015ApJ...800...18A


C.D.S. - SIMBAD4 rel 1.7 - 2020.05.25CEST01:37:46

2015ApJ...800...18A - Astrophys. J., 800, 18 (2015/February-2)

New constraints on the faint end of the UV luminosity function at z ∼ 7-8 using the gravitational lensing of the Hubble frontier fields cluster A2744.

ATEK H., RICHARD J., KNEIB J.-P., JAUZAC M., SCHAERER D., CLEMENT B., LIMOUSIN M., JULLO E., NATARAJAN P., EGAMI E. and EBELING H.

Abstract (from CDS):

Exploiting the power of gravitational lensing, the Hubble Frontier Fields (HFF) program aims at observing six massive galaxy clusters to explore the distant universe far beyond the limits of blank field surveys. Using the complete Hubble Space Telescope observations of the first HFF cluster A2744, we report the detection of 50 galaxy candidates at z ∼ 7 and eight candidates at z ∼ 8 in a total survey area of 0.96 arcmin2 in the source plane. Three of these galaxies are multiply imaged by the lensing cluster. Using an updated model of the mass distribution in the cluster we were able to calculate the magnification factor and the effective survey volume for each galaxy in order to compute the ultraviolet galaxy luminosity function (LF) at both redshifts 7 and 8. Our new measurements reliably extend the z ∼ 7 UV LF down to an absolute magnitude of MUV∼ -15.5. We find a characteristic magnitude of MUV* = -20.90–0.73+0.90 mag and a faint-end slope α = -2.01–0.28+0.20, close to previous determinations in blank fields. We show here for the first time that this slope remains steep down to very faint luminosities of 0.01 L {sstarf}. Although prone to large uncertainties, our results at z ∼ 8 also seem to confirm a steep faint-end slope below 0.1 L {sstarf}. The HFF program is therefore providing an extremely efficient way to study the faintest galaxy populations at z > 7 that would otherwise be inaccessible with current instrumentation. The full sample of six galaxy clusters will provide even better constraints on the buildup of galaxies at early epochs and their contribution to cosmic reionization.

Abstract Copyright:

Journal keyword(s): galaxies: evolution - galaxies: high-redshift - galaxies: luminosity function, mass function - gravitational lensing: strong

VizieR on-line data: <Available at CDS (J/ApJ/800/18): table3.dat table4.dat>

Nomenclature: Tables 3-4: [ARK2015] NNNN N=50+8 among (Nos 260-6670). Table 5: [ARK2015] N.N (Nos 1.1-1.3, 2.1-2.2, 5.1-5.4).

Status at CDS:  

Simbad objects: 64

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Number of rows : 64

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
#notes
1 [ARK2015] 2884 G 00 14 16.2647 -30 24 04.604         31.01 ~ 4 0
2 [ARK2015] 1467 G 00 14 16.6404 -30 24 26.683         29.97 ~ 2 0
3 [ARK2015] 4581 G 00 14 16.8786 -30 23 28.507         31.01 ~ 1 0
4 [BIO2017] A2744I-4169524527 LeG 00 14 16.9561 -30 24 52.780         27.8587 ~ 9 0
5 [ARK2015] 5398 G 00 14 17.0583 -30 23 10.097         26.96 ~ 1 0
6 [ARK2015] 3368 G 00 14 17.6295 -30 23 54.222         29.54 ~ 1 0
7 [ARK2015] 2391 LeG 00 14 17.9252 -30 24 11.938         31.00 ~ 2 0
8 [ARK2015] 1282 G 00 14 18.1161 -30 24 30.910         30.0980 ~ 4 0
9 [ARK2015] 4656 G 00 14 18.3975 -30 23 28.925   29.6636     26.0083 ~ 4 0
10 [LFL2017] A2744 z7 955 LeG 00 14 18.4534 -30 23 10.763         31.1031 ~ 8 0
11 [ARK2015] 4867 G 00 14 18.4907 -30 22 57.310         29.67 ~ 4 0
12 [ARK2015] 860 G 00 14 18.7882 -30 24 39.388     30.2417   29.8619 ~ 3 0
13 [ARK2015] 6520 LeG 00 14 19.1464 -30 22 52.090         29.7491 ~ 4 0
14 [ARK2015] 2.1 LeG 00 14 19.1625 -30 24 05.735         30.99 ~ 5 0
15 [LFL2017] A2744 z7 3258 LeG 00 14 19.3086 -30 24 18.151         29.55 ~ 10 0
16 ACO 2744 ClG 00 14 20.03 -30 23 17.8           ~ 564 0
17 [LBD2014] 21.2 LeI 00 14 20.0511 -30 23 48.124           ~ 2 0
18 [LFL2017] A2744 z7 2250 LeG 00 14 20.477 -30 23 52.67         29.17 ~ 9 0
19 [ARK2015] 4358 G 00 14 20.6999 -30 23 33.749         30.1141 ~ 3 0
20 [ARK2015] 6670 G 00 14 20.8132 -30 22 53.134     29.9045   29.7190 ~ 3 0
21 [LBD2014] 17.4 LeI 00 14 20.9883 -30 24 04.946         29.22 ~ 2 0
22 [ARK2015] 1.2 LeI 00 14 21.189 -30 24 37.20         30.61 ~ 1 0
23 [KOI2016] HFF1C-2135-2432 LeG 00 14 21.3551 -30 22 43.194     29.0681   29.7281 ~ 10 0
24 [ARK2015] 3294 G 00 14 21.4440 -30 23 55.349         29.7230 ~ 3 0
25 [ARK2015] 6245 G 00 14 21.7240 -30 22 47.132         29.6260 ~ 5 0
26 [WHH2015] GLASS 01635 G 00 14 21.9544 -30 23 24.720         28.0285 ~ 4 0
27 [ZSM2014] ZD7A2 LeG 00 14 22.1189 -30 24 35.698           ~ 5 0
28 [LFL2017] A2744 z7 22984 LeG 00 14 22.164 -30 24 35.61           ~ 5 0
29 [ZSM2014] ZD7A1 LeG 00 14 22.178 -30 24 35.63         30.99 ~ 5 0
30 [BIO2017] A2744I-4223024479 LeG 00 14 22.3074 -30 24 47.988     30.5901   29.1091 ~ 9 0
31 [LFL2017] A2744 z7 4485 LeG 00 14 22.5135 -30 24 55.598         29.7224 ~ 9 0
32 [ARK2015] 6601 LeG 00 14 22.6900 -30 22 53.141         30.99 ~ 2 0
33 [ARK2015] 6595 G 00 14 22.7098 -30 22 49.451         29.45 ~ 1 0
34 [ARK2015] 5918 G 00 14 22.8330 -30 22 52.072           ~ 2 0
35 [ARK2015] 1466 G 00 14 23.0476 -30 24 27.292     30.0130   29.5152 ~ 3 0
36 [LFL2017] A2744 z8 892 LeG 00 14 23.0624 -30 23 08.992           ~ 13 0
37 [LFL2017] A2744 z6 1391 LeG 00 14 23.2541 -30 23 25.634         31.00 ~ 5 0
38 [ARK2015] 3030 LeG 00 14 23.4249 -30 24 01.548         29.87 ~ 2 0
39 [LFL2017] A2744 z7 2019 LeI 00 14 23.4802 -30 23 45.456   29.7068     29.64 ~ 11 0
40 [LFL2017] A2744 z7 497 LeG 00 14 23.5450 -30 22 56.600         30.99 ~ 9 0
41 [ARK2015] 2223 G 00 14 23.7869 -30 24 14.717         31.00 ~ 3 0
42 [ARK2015] 800 G 00 14 24.0180 -30 24 41.854         28.8236 ~ 3 0
43 [LFL2017] A2744 z6 3979 LeG 00 14 24.1481 -30 24 37.069         29.93 ~ 8 0
44 [ZSM2014] ZD7C LeG 00 14 24.226 -30 24 02.97         30.99 ~ 4 0
45 [ARK2015] 1894 LeG 00 14 24.2268 -30 24 20.153     30.9911   31.00 ~ 4 0
46 [LFL2017] A2744 z6 184783 LeG 00 14 24.2569 -30 24 14.375         29.1464 ~ 9 0
47 [ARK2015] 980 G 00 14 24.7295 -30 24 38.012         31.00 ~ 3 0
48 [LFL2017] A2744 z6 45268 LeG 00 14 24.7709 -30 24 37.271         29.7124 ~ 12 0
49 [LFL2017] A2744 z8 482 LeG 00 14 24.8114 -30 22 56.118           ~ 13 0
50 [BIO2017] A2744I-4248222595 LeG 00 14 24.8203 -30 22 59.585         28.5931 ~ 9 0
51 [LFL2017] A2744 z8 130427 LeG 00 14 24.927 -30 22 56.15           ~ 29 0
52 [ARK2015] 1118 G 00 14 24.9942 -30 24 34.423         31.00 ~ 4 0
53 [KOI2016] HFF1C-2508-2496 LeI 00 14 25.0846 -30 22 49.674   29.7772       ~ 13 0
54 [LFL2017] A2744 z6 3867 G? 00 14 25.0959 -30 24 33.700         30.0639 ~ 8 0
55 [ARK2015] 1168 G 00 14 25.1471 -30 24 33.221         30.99 ~ 2 0
56 [LFL2017] A2744 z8 398 G? 00 14 25.2137 -30 22 53.263           ~ 8 0
57 [BIO2017] A2744I-4254923119 LeG 00 14 25.4941 -30 23 11.929         27.4590 ~ 10 0
58 [IKO2015] HFF1C-i4 G 00 14 25.5327 -30 24 26.222     30.0476   28.5858 ~ 6 0
59 [LFL2017] A2744 z8 417 LeG 00 14 25.5503 -30 22 51.582         30.99 ~ 14 0
60 [KOI2016] HFF1C-2557-2513 LeG 00 14 25.578 -30 22 51.34         30.99 ~ 11 0
61 [ARK2015] 3453 G 00 14 25.9288 -30 23 51.846         31.00 ~ 3 0
62 [ARK2015] 5038 G 00 14 26.0976 -30 23 02.897         31.00 ~ 2 0
63 [LFL2017] A2744 z6 830 G? 00 14 26.1593 -30 23 07.019   29.4165     29.1196 ~ 8 0
64 ACO 1689 ClG 13 11 29.5 -01 20 28           ~ 1016 0

    Equat.    Gal    SGal    Ecl

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2020.05.25-01:37:46

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