2021MNRAS.504.3662L

Query : 2021MNRAS.504.3662L

2021MNRAS.504.3662L - Mon. Not. R. Astron. Soc., 504, 3662-3681 (2021/July-1)

The size and pervasiveness of Ly α-UV spatial offsets in star-forming galaxies at z ∼ 6.

LEMAUX B.C., FULLER S., BRADAC M., PENTERICCI L., HOAG A., STRAIT V., TREU T., ALVAREZ C., BOLAN P., GANDHI P.J., HUANG K.-H., JONES T., MASON C., PELLICCIA D., RIBEIRO B., RYAN R.E., SCHMIDT K.B., VANZELLA E., KHUSANOVA Y., LE FEVRE O., GUAITA L., HATHI N.P., KOEKEMOER A. and PFORR J.

Abstract (from CDS):

We study the projected spatial offset between the ultraviolet continuum and Ly α emission for 65 lensed and unlensed galaxies in the Epoch of Reionization (5 <= z <= 7), the first such study at these redshifts, in order to understand the potential for these offsets to confuse estimates of the Ly α properties of galaxies observed in slit spectroscopy. While we find that ∼40 per cent of galaxies in our sample show significant projected spatial offsets (|ΔLyα - UV_|), we find a relatively modest average projected offset of (|\widetildeΔ_ Lyα_ - UV_| = 0.61 ± 0.08 proper kpc for the entire sample. A small fraction of our sample, ∼10 per cent, exhibit offsets in excess of 2 proper kpc, with offsets seen up to ∼4 proper kpc, sizes that are considerably larger than the effective radii of typical galaxies at these redshifts. An internal comparison and a comparison to studies at lower redshift yielded no significant evidence of evolution of |Δ_ Lyα- UV_| with redshift. In our sample, ultraviolet (UV)-bright galaxies (\widetildeLUV/L*UV=0.67) showed offsets a factor of three greater than their fainter counterparts (\widetildeLUV/L*UV=0.10), 0.89 ± 0.18 versus 0.27 ± 0.05 proper kpc, respectively. The presence of companion galaxies and early stage merging activity appeared to be unlikely causes of these offsets. Rather, these offsets appear consistent with a scenario in which internal anisotropic processes resulting from stellar feedback, which is stronger in UV-brighter galaxies, facilitate Ly α fluorescence and/or backscattering from nearby or outflowing gas. The reduction in the Ly α flux due to offsets was quantified. It was found that the differential loss of Ly α photons for galaxies with average offsets is not, if corrected for, a limiting factor for all but the narrowest slit widths (<0.4 arcsec). However, for the largest offsets, if they are mostly perpendicular to the slit major axis, slit losses were found to be extremely severe in cases where slit widths of <=1 arcsec were employed, such as those planned for James Webb Space Telescope/NIRSpec observations.

Abstract Copyright: © 2021 The Author(s) Published by Oxford University Press on behalf of Royal Astronomical Society

Journal keyword(s): gravitational lensing: strong - techniques: photometric - techniques: spectroscopic - galaxies: evolution - galaxies: high-redshift - reionization

VizieR on-line data: <Available at CDS (J/MNRAS/504/3662): table1.dat table2.dat>

Simbad objects: 63

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Number of rows : 63
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 [ARK2015] 1.1 EmG 00 14 22.164 -30 24 35.61           ~ 11 0
2 CANDELS UDS F160W J021655.57-051123.2 EmG 02 16 55.57 -05 11 23.2           ~ 6 0
3 CANDELS UDS F160W J021714.50-050844.2 EmG 02 17 14.50 -05 08 44.2       28.243   ~ 6 0
4 CANDELS UDS F160W J021725.46-051529.6 EmG 02 17 25.45 -05 15 29.6           ~ 5 0
5 CANDELS UDS F160W J021735.33-051032.4 EmG 02 17 35.337 -05 10 32.50           ~ 14 0
6 CANDELS UDS F160W J021754.17-051454.5 EmG 02 17 54.1754 -05 14 54.596           ~ 14 0
7 CANDELS UDS F160W J021755.68-051453.4 EmG 02 17 55.6870 -05 14 53.412           ~ 6 0
8 CANDELS UDS F160W J021755.88-051143.1 EmG 02 17 55.8811 -05 11 43.098           ~ 7 0
9 CANDELS UDS F160W J021757.30-051556.5 EmG 02 17 57.3029 -05 15 56.499           ~ 8 0
10 [FLB2020] A370.43 EmG 02 39 51.912 -01 35 13.54           ~ 2 0
11 NAME HCM 6A EmG 02 39 54.737 -01 33 32.24           ~ 50 0
12 [FLB2020] A370.55 EmG 02 39 57.6467 -01 34 16.371           ~ 5 0
13 GOODS J033228.19-274818.7 EmG 03 32 28.1925 -27 48 18.673           ~ 11 0
14 JADES-GS+053.12259-27.76057 EmG 03 32 29.4096 -27 45 37.800           ~ 16 0
15 JADES-GS+053.12487-27.78413 EmG 03 32 29.973 -27 47 02.80           ~ 14 0
16 JADES-GS+053.14197-27.75523 EmG 03 32 34.06 -27 45 18.5           ~ 8 0
17 GOODS-MUSIC 10898 EmG 03 32 36.470 -27 46 41.44   29.56 31.02   26.54 ~ 25 0
18 JADES-GS+053.15953-27.77152 EmG 03 32 38.282 -27 46 17.22   29.3328 30.49     ~ 28 0
19 GOODS J033239.06-274538.7 EmG 03 32 39.066 -27 45 38.75   30.7705 38.76     ~ 29 0
20 [BIO2011] UDFz-41826112 EmG 03 32 41.823 -27 46 11.24         29.79 ~ 14 0
21 MUSE-WIDE 154037129 EmG 03 32 43.17 -27 45 17.5           ~ 8 0
22 ZFOURGE CDFS 13932 EmG 03 32 48.48 -27 48 58.8           ~ 8 0
23 CLASH MACSJ0416.1-2403 1950 EmG 04 16 08.7625 -24 05 32.281         27.4 ~ 3 0
24 CLASH MACSJ0416.1-2403 427 EmG 04 16 11.4836 -24 03 43.448         28.2550 ~ 23 0
25 [FLB2020] MACS0416.89 EmG 04 16 11.680 -24 04 55.86           ~ 2 0
26 [FLB2020] MACS0717.59 EmG 07 17 30.694 +37 44 34.19           ~ 10 0
27 CLASH MACSJ0717.5+3745 166 EmG 07 17 33.9463 +37 46 01.372         27.8 ~ 6 0
28 CLASH MACSJ0717.5+3745 1991 EmG 07 17 34.1604 +37 44 17.098         27.22 ~ 7 0
29 CLASH MACSJ0717.5+3745 1730 EmG 07 17 37.860 +37 44 33.87         27.99 ~ 13 0
30 [FLB2020] MACS0717.53 EmG 07 17 39.0850 +37 44 01.695         29.70 ~ 7 0
31 [FLB2020] MACS0744.17 EmG 07 44 48.511 +39 26 53.56           ~ 2 0
32 CLASH MACSJ0744.9+3927 2374 EmG 07 44 53.0597 +39 26 28.135         27.2 ~ 3 0
33 CANDELS COSMOS F160W J100025.86+021618.9 EmG 10 00 25.86 +02 16 18.8           ~ 5 0
34 CANDELS COSMOS F160W J100043.92+022621.1 EmG 10 00 43.92 +02 26 21.1           ~ 6 0
35 CANDELS COSMOS F160W J100047.33+022843.1 EmG 10 00 47.333 +02 28 43.14           ~ 21 0
36 CLASH MACSJ1149.6+2223 226 EmG 11 49 38.882 +22 24 56.82         26.2 ~ 10 0
37 [FLB2020] MACS1147.51 EmG 11 49 39.120 +22 25 07.91           ~ 6 0
38 NAME NTTDF reg 12 05 -07.5           ~ 21 0
39 [PFV2011] NTT-7246 G 12 05 31.233 -07 46 12.21           ~ 2 0
40 [CFP2010] NTTDF 6345 G 12 05 36.9 -07 45 22           ~ 18 0
41 [FLB2020] RXJ1347.25 EmG 13 47 28.951 -11 45 11.18           ~ 2 0
42 [FLB2020] RXJ1347.28 EmG 13 47 30.0182 -11 45 31.833           ~ 2 0
43 [FLB2020] RXJ1347.45 EmG 13 47 31.597 -11 45 41.34           ~ 2 0
44 [FLB2020] RXJ1347.29 EmG 13 47 32.7768 -11 45 43.455           ~ 2 0
45 CLASH RXJ1347-1145 1202 EmG 13 47 33.2737 -11 45 15.416         28.0 ~ 3 0
46 [FLB2020] RXJ1347.4 EmG 13 47 34.964582 -11 45 16.69542           ~ 3 0
47 [FLB2020] RXJ1347.47 EmG 13 47 36.204 -11 45 15.12           ~ 18 0
48 CLASH RXJ1347-1145 828 EmG 13 47 36.7235 -11 45 01.329         29.1 ~ 3 0
49 [FLB2020] MACS1423.13 EmG 14 23 42.914688 +24 05 02.06047           ~ 4 0
50 [FLB2020] MACS1423.16 EmG 14 23 42.943 +24 04 22.25           ~ 3 0
51 [FLB2020] MACS1423.26 EmG 14 23 44.609 +24 04 42.29           ~ 5 0
52 [FLB2020] MACS1423.37 EmG 14 23 44.683 +24 04 28.86           ~ 2 0
53 [FLB2020] MACS1423.38 EmG 14 23 44.731 +24 03 25.53           ~ 2 0
54 [FLB2020] MACS1423.17 EmG 14 23 53.422200 +24 04 21.57412           ~ 3 0
55 [FLB2020] MACS2129.28 EmG 21 29 20.723 -07 41 47.67           ~ 2 0
56 CLASH MACSJ2129.4-0741 1307 EmG 21 29 24.223 -07 41 36.08         27.9 ~ 8 0
57 [FLB2020] MACS2129.31 EmG 21 29 24.778 -07 41 51.03           ~ 9 0
58 [FLB2020] MACS2129.36 EmG 21 29 24.946 -07 40 53.96           ~ 8 0
59 [FLB2020] MACS2129.5 EmG 21 29 27.406 -07 42 06.98           ~ 3 0
60 [FLB2020] MACS2214.1 EmG 22 14 53.6292 -14 00 51.467           ~ 2 0
61 [PFV2011] BDF-5870 G 22 27 49.321 -35 12 32.27           ~ 2 0
62 [PFV2011] BDF-4085 G 22 27 49.759 -35 10 51.78           ~ 2 0
63 [PFV2011] BDF-3995 G 22 27 54.968 -35 10 46.06           ~ 2 0

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