2024A&A...684A..42K

Query : 2024A&A...684A..42K

2024A&A...684A..42K - Astronomy and Astrophysics, volume 684A42 (2024/4-1)

Lyman continuum leaker candidates at z ∼ 3-4 in the HDUV based on a spectroscopic sample of MUSE LAEs.

KERUTT J., OESCH P.A., WISOTZKI L., VERHAMME A., ATEK H., HERENZ E.C., ILLINGWORTH G.D., KUSAKABE H., MATTHEE J., MAUERHOFER V., MONTES M., NAIDU R.P., NELSON E., REDDY N., SCHAYE J., SIMMONDS C., URRUTIA T. and VITTE E.

Abstract (from CDS):

Context. In recent years, a number of Lyman continuum (LyC) leaker candidates have been found at intermediate redshifts, providing insight into how the Universe was reionised at early cosmic times. There are now around 100 known LyC leakers at all redshifts, which enables us to analyse their properties statistically.
Aims. Here, we identify new LyC leaker candidates at z ≈ 3 - 4.5 and compare them to objects from the literature to get an overview of the different observed escape fractions and their relation to the properties of the Lyman α (Lyα) emission line. The aim of this work is to test the indicators (or proxies) for LyC leakage suggested in the literature and to improve our understanding of the kinds of galaxies from which LyC radiation can escape.
Methods. We used data from the Hubble Deep Ultraviolet (HDUV) legacy survey to search for LyC emission based on a sample of ≈2000 Lyα emitters (LAEs) detected previously in two surveys with the Multi-Unit Spectroscopic Explorer (MUSE), namely MUSE-Deep and MUSE-Wide. Based on the redshifts and positions of the LAEs, we look for potential LyC leakage in the WFC3/UVIS F336W band of the HDUV survey. The escape fractions are measured and compared in different ways, including spectral energy distribution (SED) fitting performed using the CIGALE software.
Results. We add 12 objects to the sample of known LyC leaker candidates (5 highly likely leakers and 7 potential ones), 1 of which was previously known, and compare their Lyα properties to their escape fractions. We find escape fractions of between ∼20% and ∼90%, assuming a high transmission in the intergalactic medium (IGM). We present a method whereby the number of LyC leaker candidates we find is used to infer the underlying average escape fraction of galaxies, which is ≈12%.
Conclusion. Based on their Lyα properties, we conclude that LyC leakers are not very different from other high-z LAEs and suggest that most LAEs could be leaking LyC even if this cannot always be detected because of the direction of emission and the transmission properties of the IGM.

Abstract Copyright: © The Authors 2024

Journal keyword(s): galaxies: evolution - galaxies: formation - galaxies: high-redshift - dark ages - reionization - first stars

Simbad objects: 45

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Number of rows : 45
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 NAME SMC G 00 52 38.0 -72 48 01   2.79 2.2     ~ 12317 1
3 SDSS J012156.09+002520.3 QSO 01 21 56.094 +00 25 20.31           ~ 17 0
4 NAME Magellanic Clouds GrG 03 00 -71.0           ~ 7988 0
5 CANDELS GDS F160W J033203.24-274518.8 EmG 03 32 03.243 -27 45 18.82   25.210 24.39 24.610   ~ 44 0
6 CANDELS GDS F160W J033216.63-274253.3 EmG 03 32 16.63558 -27 42 53.3790   25.032   23.578 24.8136 ~ 31 0
7 CANDELS GDS F160W J033223.84-275021.1 EmG 03 32 23.8449 -27 50 21.144           ~ 14 0
8 NAME GOODS Southern Field reg 03 32 28.0 -27 48 30           ~ 1623 1
9 NAME Chandra Deep Field-South reg 03 32 28.0 -27 48 30           ~ 2282 1
10 LEGO-GOODS-S 8 EmG 03 32 30.795 -27 47 19.15 28.7760 28.3021 27.62     ~ 14 0
11 MUSE-WIDE 122032127 EmG 03 32 31.8192 -27 50 14.648           ~ 11 0
12 JADES-GS NC 333678 EmG 03 32 32.588 -27 47 43.70   27.7083       ~ 10 0
13 [SWM2014] GOODS-S 24480 G 03 32 32.591 -27 47 43.75           ~ 2 0
14 CANDELS GDS F160W J033233.32-275007.3 EmG 03 32 33.3263 -27 50 07.365   27.2922   24.80 24.7890 ~ 30 0
15 [SWM2014] GOODS-S 23769 G 03 32 36.979 -27 47 55.64           ~ 2 0
16 MUSE-WIDE 603452147 EmG 03 32 36.981 -27 47 55.64   29.2265 27.59     ~ 13 0
17 GOODS J033238.50-274902.6 EmG 03 32 38.494 -27 49 02.49   30.6003 28.04     ~ 11 0
18 GOODS J033240.30-274752.6 rG 03 32 40.296 -27 47 52.63 27.4823 26.0835 25.053 25.042   ~ 34 0
19 [SWM2014] GOODS-S 27696 G 03 32 43.014 -27 46 58.24           ~ 2 0
20 MUSE-WIDE 604062373 EmG 03 32 43.024 -27 46 58.42   27.3721       ~ 11 0
21 MUSE-WIDE 604172404 EmG 03 32 44.418 -27 47 02.21 29.0416 28.7492 27.25     ~ 15 0
22 CANDELS GDS F160W J033245.39-275010.5 EmG 03 32 45.39 -27 50 10.5           ~ 15 0
23 JADES-GS NC 306088 EmG 03 32 49.00 -27 49 01.9     26.85     ~ 20 0
24 2MASX J04420810-3801108 H2G 04 42 08.110 -38 01 10.88 15.66 17.21 15.80 16.00   ~ 54 0
25 NAME LMC G 05 23 34.6 -69 45 22     0.4     ~ 19090 0
26 2MASX J08382309+6507160 SBG 08 38 23.093 +65 07 16.05     14.16     ~ 141 2
27 2MASS J09215939+4509126 QSO 09 21 59.397 +45 09 12.38   18.57 18.31     ~ 64 0
28 SDSS J092532.36+140313.1 EmG 09 25 32.3639224872 +14 03 12.998128212           ~ 39 0
29 Z 38-42 bCG 10 53 03.845 +04 37 54.24   14.1       ~ 83 0
30 CSWA 1 gLS 11 48 33.10 +19 30 03.2           ~ 90 0
31 SDSS J115448.85+244333.0 G 11 54 48.854 +24 43 33.04           ~ 31 0
32 GNS 3687 G 12 36 48.4551 +62 16 00.047 24.87 24.9346 25.37 24.64 24.5011 ~ 14 0
33 EC 12476-2317 AGN 12 50 18.90 -23 33 57.6   16.29 15.46     ~ 72 0
34 Z 189-2 GiC 12 56 55.638 +32 26 51.50   15.1       ~ 90 0
35 SDSS J131629.61+261407.0 QSO 13 16 29.614 +26 14 07.05           ~ 22 0
36 MCG+10-19-072 Sy2 13 25 53.82030 +57 15 16.0664   15.0       ~ 84 0
37 SDSS J150342.82+364450.7 EmG 15 03 42.8266534776 +36 44 50.729142300           ~ 27 0
38 NAME Sunburst Arc LeG 15 50 04.4 -78 11 00           ~ 113 0
39 [MSN2013] MD5 G 15 51 45.211 +19 11 05.13     24.96     ~ 4 0
40 [MSN2013] C25 EmG 15 52 06.069 +19 11 28.37     24.60 24.83   ~ 23 0
41 NGC 6090 PaG 16 11 40.3 +52 27 21   14.0       ~ 446 1
42 NAME A2218-Flanking G 16 35 50.475 +66 13 06.38           ~ 13 0
43 SAS-LBG SSA22a-C49 G 22 17 19.80 +00 18 19.0       23.81   ~ 14 0
44 SAS-LBG SSA22a-D3 EmG 22 17 32.40 +00 11 34.1       23.92   ~ 37 0
45 SSA 22 reg 22 17 34.7 +00 15 07           ~ 351 0

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