2016A&A...587A.133G

Query : 2016A&A...587A.133G

2016A&A...587A.133G - Astronomy and Astrophysics, volume 587A133-133 (2016/3-1)

Limits on the LyC signal from z ∼ 3 sources with secure redshift and HST coverage in the E-CDFS field.

GUAITA L., PENTERICCI L., GRAZIAN A., VANZELLA E., NONINO M., GIAVALISCO M., ZAMORANI G., BONGIORNO A., CASSATA P., CASTELLANO M., GARILLI B., GAWISER E., LE BRUN V., LE FEVRE O., LEMAUX B.C., MACCAGNI D., MERLIN E., SANTINI P., TASCA L.A.M., THOMAS R., ZUCCA E., DE BARROS S., HATHI N.P., AMORIN R., BARDELLI S. and FONTANA A.

Abstract (from CDS):

Determining the strength of the Lyman continuum (LyC) and the fraction of LyC escape have implications for the properties of the emitting sources at any redshift, but also for the re-ionization of the Universe at z>6. We aim to measure the LyC signal from a sample of sources in the Chandra deep field south. We collect star-forming galaxies (SFGs) and active galactic nuclei (AGN) with accurate spectroscopic redshifts, for which Hubble Space Telescope (HST) coverage and multi-wavelength photometry are available. We selected a sample of about 200 sources at z∼3. Taking advantage of HST resolution, we applied a careful cleaning procedure and rejected sources showing nearby clumps with different colours, which could be lower-z interlopers. Our clean sample consisted of 86 SFGs (including 19 narrow-band selected Lyα emitters) and 8 AGN (including 6 detected in X-rays). We measured the LyC flux from aperture photometry in four narrow-band filters covering wavelengths below a 912Å rest frame (3.11<z<3.53). We estimated the ratio between ionizing (LyC flux) and 1400Å non-ionizing emissions for AGN and galaxies. By running population synthesis models, we assume an average intrinsic Lν(1400Å)/Lν(900Å) ratio of 5 as the representative value for our sample. With this value and an average treatment of the lines of sight of the inter-galactic medium, we estimate the LyC escape fraction relative to the intrinsic value (fescrel(LyC)). We do not directly detect ionizing radiation from any individual SFG, but we are able to set a 1(2)σ upper limit of fescrel(LyC)<12(24)%. This result is consistent with other non-detections published in the literature. No meaningful limits can be calculated for the sub-sample of Lyα emitters. We obtain one significant direct detection for an AGN at z=3.46, with fescrel(LyC)=(72±18)%. Our upper limit on fescrel(LyC) implies that the SFGs studied here do not present either the physical properties or the geometric conditions suitable for efficient LyC-photon escape.

Abstract Copyright: ∼

Journal keyword(s): galaxies: star formation - galaxies: active

Simbad objects: 91

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Number of rows : 91
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 ESO 350-38 Sy2 00 36 52.489 -33 33 17.23   14.31 14.41 13.49   ~ 450 0
2 [GCH2007] 29 G 03 31 47.800 -27 45 03.38     26.35     ~ 4 0
3 [GCH2007] 38 G 03 31 50.369 -27 59 10.12     26.52     ~ 4 0
4 [GCH2007] 26 G 03 31 51.561 -27 46 47.02     26.16     ~ 4 0
5 [HSN2014] 79422 G 03 31 52.940 -27 42 15.62           ~ 2 0
6 [GCH2007] 24 G 03 31 53.213 -27 57 08.16     26.18     ~ 4 0
7 VANDELS CDFS 217302 EmG 03 31 54.885 -27 51 21.11     25.32     ~ 7 0
8 [HSN2014] 49017 G 03 31 58.44125 -27 58 21.5234   26.12   25.084   ~ 3 0
9 [HSN2014] 73615 G 03 31 58.64866 -27 45 33.4501   26.34   25.088   ~ 3 0
10 CXOECDFS J033159.0-274423 EmG 03 31 59.03 -27 44 23.3       24.76   ~ 9 0
11 [ABB2003] CDFS 33 AGN 03 31 59.707 -27 49 47.48     25.99     ~ 19 0
12 VANDELS CDFS 123006 EmG 03 32 00.505 -27 47 24.52           ~ 4 0
13 GOODS J033202.17-274230.4 EmG 03 32 02.162 -27 42 30.42   26.52 25.46 24.98   ~ 7 0
14 CANDELS GDS F160W J033203.24-274518.8 EmG 03 32 03.243 -27 45 18.82   25.210 24.39 24.610   ~ 44 0
15 GOODS-MUSIC 14518 G 03 32 03.491 -27 43 40.51   25.76 24.79 24.493 24.382 ~ 12 0
16 [HSN2014] 37590 G 03 32 04.724 -28 02 42.46           ~ 1 0
17 GOODS J033206.18-274501.9 EmG 03 32 06.169 -27 45 01.87   26.45 25.27 24.838   ~ 11 0
18 VANDELS CDFS 009692 EmG 03 32 06.4416 -27 49 15.480           ~ 11 0
19 GOODS-MUSIC 11537 EmG 03 32 06.58539 -27 46 13.0797   26.86 25.71 25.183 24.177 ~ 8 0
20 VANDELS CDFS 244169 EmG 03 32 06.630 -27 40 41.01           ~ 3 0
21 VANDELS CDFS 020583 EmG 03 32 07.39 -27 44 05.6           ~ 11 0
22 ACS-GC 90043036 AGN 03 32 07.49664 -27 47 06.7999   24.966   23.334   ~ 9 0
23 GOODS J033208.46-274015.6 G 03 32 08.45957 -27 40 15.5950   25.75   24.630   ~ 2 0
24 VUDS 530035567 G 03 32 09.4785 -27 50 13.543           ~ 5 0
25 GOODS-MUSIC 12730 G 03 32 09.596 -27 45 14.67   26.46 25.09 24.5482 24.209 ~ 10 0
26 GOODS J033209.64-275122.9 EmG 03 32 09.64070 -27 51 22.9061   25.630   24.955   ~ 8 0
27 [GCH2007] 114 G 03 32 10.528 -27 59 17.64     27.32     ~ 2 0
28 VANDELS CDFS 020745 EmG 03 32 11.02 -27 44 00.9           ~ 13 0
29 MUSE-WIDE 145006019 EmG 03 32 11.6483 -27 47 19.149           ~ 7 0
30 GOODS J033212.94-274451.5 G 03 32 12.931 -27 44 51.50   26.00 24.92 24.970 24.7395 ~ 11 0
31 GOODS J033213.06-275408.6 EmG 03 32 13.05506 -27 54 08.5583   25.361   24.978   ~ 4 0
32 MUSE-WIDE 146016242 EmG 03 32 13.22 -27 46 42.6           ~ 15 0
33 GOODS-MUSIC 5766 EmG 03 32 14.78299 -27 50 46.4478   22.088 23.7189 23.727 24.0719 ~ 16 0
34 GNS 5989 EmG 03 32 14.81326 -27 52 04.4605   24.223   25.190 24.1483 ~ 16 0
35 [HSN2014] 59311 G 03 32 15.50652 -27 54 04.2786   25.29   24.656   ~ 3 0
36 LEGO-GOODS-S 19 G 03 32 15.787 -27 44 10.24   27.02 26.01     ~ 4 0
37 [GCH2007] 36 G 03 32 18.926 -27 38 40.19     26.98     ~ 4 0
38 GOODS J033219.41-274728.4 QSO 03 32 19.4095 -27 47 28.397   26.4250     24.6866 ~ 15 0
39 GOODS J033222.46-274438.3 EmG 03 32 22.473 -27 44 38.44   26.84 25.23 25.12 24.584 ~ 13 0
40 GOODS J033222.89-274115.2 EmG 03 32 22.900 -27 41 15.16   26.00 25.15 25.18   ~ 14 0
41 GOODS J033224.61-273801.8 G 03 32 24.61423 -27 38 01.7650   25.83   25.06   ~ 2 0
42 GOODS J033227.20-274151.8 G 03 32 27.200 -27 41 51.77   25.6820   24.791 24.7824 ~ 9 0
43 CANDELS GDS F160W J033227.97-275148.4 EmG 03 32 27.98 -27 51 48.4           ~ 6 0
44 NAME Chandra Deep Field-South reg 03 32 28.0 -27 48 30           ~ 2282 1
45 GOODS J033228.95-274411.8 G 03 32 28.948 -27 44 11.68   22.038 24.66 24.081   ~ 12 0
46 LEGO-GOODS-S 4 G 03 32 31.449 -27 43 36.98   27.63 26.91     ~ 2 0
47 [WDK2001] 14580 G 03 32 31.77127 -27 57 07.9110   25.206   23.653 23.08 ~ 4 0
48 VUDS 530044792 G 03 32 31.974 -27 46 47.20   26.9303       ~ 9 0
49 GOODS J033232.67-275337.5 G 03 32 32.66544 -27 53 37.5526   25.82   24.566   ~ 7 0
50 GOODS J033233.36-274255.1 G 03 32 33.361 -27 42 55.05   22.527 24.71 24.428   ~ 9 0
51 VUDS 530048288 G 03 32 33.7006 -27 45 33.453           ~ 5 0
52 GOODS J033234.40-274124.3 G 03 32 34.399 -27 41 24.36   26.3716     24.3402 ~ 14 0
53 GOODS J033234.83-275325.2 EmG 03 32 34.83156 -27 53 25.2215   24.589   23.098 24.2706 ~ 15 0
54 GOODS-MUSIC 11303 EmG 03 32 35.692 -27 46 22.60   27.1778 25.84     ~ 16 0
55 GMASS 1788 G 03 32 36.31718 -27 44 34.5026   25.56   24.430   ~ 15 0
56 GOODS J033237.96-275532.5 G 03 32 37.96524 -27 55 32.5232   24.925   25.400   ~ 5 0
57 GOODS J033239.76-273956.8 G 03 32 39.755 -27 39 56.67   25.95 25.07 24.939 24.838 ~ 8 0
58 GOODS J033240.52-273747.8 G 03 32 40.51651 -27 37 47.7610   25.63   24.232   ~ 2 0
59 CANDELS GDS F160W J033241.20-275032.8 EmG 03 32 41.20956 -27 50 32.8114   24.184   24.401   ~ 8 0
60 JADES-GS NC 155468 rG 03 32 42.7212 -27 44 07.568           ~ 8 0
61 GOODS J033242.86-274206.4 G 03 32 42.858 -27 42 06.33   23.966 24.58 24.539   ~ 9 0
62 [HSN2014] 34808 G 03 32 43.436 -27 40 23.06           ~ 2 0
63 GOODS J033244.84-275253.2 G 03 32 44.84393 -27 52 53.2103   25.84   24.826   ~ 7 0
64 [HSN2014] 56382 G 03 32 46.20302 -27 55 29.0449   25.34   24.93   ~ 3 0
65 VUDS 530046323 G 03 32 46.5106 -27 46 16.643           ~ 5 0
66 [GCH2007] 18 G 03 32 46.754 -27 39 59.91     26.72     ~ 4 0
67 [HSN2014] 46323 G 03 32 49.560 -27 59 29.87           ~ 1 0
68 [HSN2014] 91256 G 03 32 49.656 -27 37 21.49           ~ 1 0
69 [HSN2014] 27939 G 03 32 49.7845 -27 52 46.802           ~ 2 0
70 [HSN2014] 46783 G 03 32 50.756 -27 59 20.88           ~ 1 0
71 GNS 5793 G 03 32 51.8064 -27 52 36.535   26.1444     25.0088 ~ 12 0
72 GOODS J033252.18-275230.3 EmG 03 32 52.18145 -27 52 30.2884   25.008   25.82   ~ 9 0
73 GOODS J033252.54-274815.3 G 03 32 52.54145 -27 48 15.3392   25.36   27.02 24.8451 ~ 8 0
74 GOODS J033252.75-275001.8 G 03 32 52.74931 -27 50 01.8258   25.347   24.628   ~ 4 0
75 VANDELS CDFS 003037 EmG 03 32 53.70 -27 53 03.9           ~ 8 0
76 GOODS J033254.89-274732.4 G 03 32 54.88574 -27 47 32.3725   25.69   24.720 25.1998 ~ 7 0
77 [HSN2014] 28279 G 03 32 54.983 -27 52 07.00           ~ 2 0
78 GOODS J033255.07-275227.3 G 03 32 55.06570 -27 52 27.2701   25.181   26.52   ~ 7 0
79 [GCH2007] 41 G 03 32 56.672 -27 49 49.20     26.78     ~ 4 0
80 GOODS J033257.32-274731.5 EmG 03 32 57.32470 -27 47 31.5485   25.179   24.051   ~ 6 0
81 VANDELS CDFS 132586 EmG 03 33 00.247 -27 42 42.55           ~ 4 0
82 GOODS J033300.93-275148.0 EmG 03 33 00.92477 -27 51 47.9920   24.203   23.740   ~ 11 0
83 GOODS J033301.08-274734.0 EmG 03 33 01.08012 -27 47 34.0361   25.59   25.004   ~ 4 0
84 GOODS J033305.96-275228.4 G 03 33 05.95956 -27 52 28.3879   26.04   25.19   ~ 4 0
85 [GCH2007] 58 G 03 33 06.943 -27 42 27.85     26.61     ~ 4 0
86 [GCH2007] 121 G 03 33 23.709 -27 44 09.14     26.97     ~ 4 0
87 [GCH2007] 140 G 03 33 24.452 -27 44 34.00     27.01     ~ 2 0
88 [GCH2007] 86 G 03 33 28.159 -28 03 20.77     27.27     ~ 2 0
89 2MASS J09215939+4509126 QSO 09 21 59.397 +45 09 12.38   18.57 18.31     ~ 64 0
90 NAME COSMOS Field reg 10 00 28.60 +02 12 21.0           ~ 3639 0
91 EC 12476-2317 AGN 12 50 18.90 -23 33 57.6   16.29 15.46     ~ 72 0

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