2022A&A...666A.145R


Query : 2022A&A...666A.145R

2022A&A...666A.145R - Astronomy and Astrophysics, volume 666A, 145 (2022/10-1)

A bottom-up search for Lyman-continuum leakage in the Hubble Ultra Deep Field.

RIVERA-THORSEN T.E., HAYES M. and MELINDER J.

Abstract (from CDS):


Context. When studying the production and escape of Lyman continuum (LyC) from galaxies, it is standard to rely on an array of indirect observational tracers in the preselection of candidate leakers.
Aims. In this work, we investigate how much ionizing radiation might be missed due to these selection criteria by completely removing them and performing a search selected purely from rest-frame LyC emission; and how that affects our estimates of the ionizing background.
Methods. We inverted the conventional method and performed a bottom-up search for LyC leaking galaxies at redshifts 2 ≲ z ≲ 3.5. Using archival data from HST and VLT/MUSE, we ran source finding software on UV-filter HST images from the Hubble Ultra Deep Field (HUDF), and subjected all detected sources to a series of tests to eliminate those that are inconsistent with being ionizing sources.
Results. We find six new and one previously identified candidate leakers with absolute escape fractions ranging from 36% to ∼100%. Our filtering criteria eliminate one object previously reported as a candidate ionizing emitter in the literature, and we report non-detections in the rest-frame Lyman continuum of two other previously reported sources. We find that our candidates make a contribution to the metagalactic ionizing field of $ \log_{10}(\epsilon_{\nu}) = 25.32^{+0.25}_{-0.21} $ and $ 25.29^{+0.27}_{-0.22} $ erg s–1 Hz–1 cMpc–3 for the full set of candidates and for the four strongest candidates only; both values are higher than but consistent with other recent figures in the literature.
Conclusions. Our findings suggest that galaxies that do not meet the usual selection criteria may make a non-negligible contribution to the cosmic ionizing field. We recommend that similar searches be carried out on a larger scale in well-studied fields with both UV and large ancillary data coverage, for example in the full set of CANDELS fields.

Abstract Copyright: © T. E. Rivera-Thorsen et al. 2022

Journal keyword(s): dark ages, reionization, first stars - galaxies: ISM - galaxies: evolution - galaxies: general

Simbad objects: 18

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Number of rows : 18
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2024
#notes
1 ESO 350-38 Sy2 00 36 52.489 -33 33 17.23   14.31 14.41 13.49   ~ 381 0
2 NAME Magellanic Clouds GrG 03 00 -71.0           ~ 7084 0
3 NAME Magellanic Bridge HI 03 11 -77.5           ~ 449 1
4 GOODS-MUSIC 13385 G 03 32 22.651 -27 44 40.54   25.59 25.10     ~ 5 0
5 NAME Chandra Deep Field-South reg 03 32 28.0 -27 48 30           ~ 2093 1
6 UDF 6227 G 03 32 32.837 -27 47 10.03 27.9943 26.5613 25.70     ~ 11 0
7 [RTG2015] 37178 G 03 32 36.904 -27 47 05.59 27.0941 25.4509       ~ 2 0
8 UDF 9806 G 03 32 36.991 -27 45 34.83 27.0375 26.2572 26.0711     ~ 9 0
9 NAME Hubble Ultra Deep Field reg 03 32 39.0 -27 47 29           ~ 1675 0
10 GOODS J033240.30-274752.6 AGN 03 32 40.296 -27 47 52.63 27.4823 26.0835 25.053 25.042   ~ 24 0
11 GOODS-MUSIC 9434 EmG 03 32 40.515 -27 47 49.01 25.9687 25.6697 25.66     ~ 13 0
12 UDF 8014 G 03 32 40.707 -27 46 21.40 28.2931 27.8537 27.732     ~ 6 0
13 UDF 7844 G 03 32 40.742 -27 46 21.00 28.9572 28.3800 27.21     ~ 7 0
14 GOODS-MUSIC 11256 G 03 32 41.647 -27 46 25.27 26.7526 26.2685 26.15     ~ 8 0
15 [IBB2017] 7380 G 03 32 41.65680 -27 46 25.0115           ~ 2 0
16 NAME COSMOS Field reg 10 00 28.60 +02 12 21.0           ~ 2981 0
17 NAME GOODS-N Field reg 12 36 55.0 +62 14 15           ~ 1158 1
18 NAME Extended Groth Strip reg 14 19 +52.8           ~ 829 0

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