2022A&A...666A..78C


Query : 2022A&A...666A..78C

2022A&A...666A..78C - Astronomy and Astrophysics, volume 666A, 78 (2022/10-1)

The Lensed Lyman-Alpha MUSE Arcs Sample (LLAMAS) I. Characterisation of extended Lyman-alpha halos and spatial offsets.

CLAEYSSENS A., RICHARD J., BLAIZOT J., GAREL T., KUSAKABE H., BACON R., BAUER F.E., GUAITA L., JEANNEAU A., LAGATTUTA D., LECLERCQ F., MASEDA M., MATTHEE J., NANAYAKKARA T., PELLO R., THAI T.T., TUAN-ANH P., VERHAMME A., VITTE E. and WISOTZKI L.

Abstract (from CDS):


Aims. We present the Lensed Lyman-Alpha MUSE Arcs Sample (LLAMAS) selected from MUSE and HST observations of 17 lensing clusters. The sample consists of 603 continuum-faint (-23 < MUV < -14) lensed Lyman-α emitters (producing 959 images) with secure spectroscopic redshifts between 2.9 and 6.7. Combining the power of cluster magnification with 3D spectroscopic observations, we were able to reveal the resolved morphological properties of 268 Lyman-α emitters.
Methods. We used a forward-modeling approach to model both Lyman-α and rest-frame UV continuum emission profiles in the source plane and measure spatial extent, ellipticity, and spatial offsets between UV and Lyman-α emission.
Results. We find a significant correlation between UV continuum and Lyman-α spatial extent. Our characterization of the Lyman-α halos indicates that the halo size is linked to the physical properties of the host galaxy (SFR, Lyman-α equivalent width, Lyman-α line FWHM). We find that 48% of Lyman-α halos are best fit by an elliptical emission distribution with a median axis ratio of q = 0.48. We observe that 60% of galaxies detected both in UV and Lyman-α emission show a significant spatial offset (Δ_Lyα - UV_). We measure a median offset of Δ_Lyα - UV_ = 0.58 ± 0.14 kpc for the entire sample. By comparing the spatial offset values with the size of the UV component, we show that 40% of the offsets could be due to star-forming sub-structures in the UV component, while the larger offsets (60%) are more likely due to greater-distance processes such as scattering effects inside the circumgalactic medium or emission from faint satellites or merging galaxies. Comparisons with a zoom-in radiative hydrodynamics simulation of a typical Lyman-α emitting galaxy show a very good agreement with LLAMAS galaxies and indicate that bright star-formation clumps and satellite galaxies could produce a similar spatial offset distribution.

Abstract Copyright: © A. Claeyssens et al. 2022

Journal keyword(s): Galaxy: evolution - galaxies: high-redshift - gravitational lensing: strong

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 ACO 2744 ClG 00 14 20.03 -30 23 17.8           ~ 819 0
2 ACO 370 ClG 02 39 50.5 -01 35 08           ~ 749 0
3 ACO 402 ClG 02 57 41.33 -22 09 14.4           ~ 49 0
4 ClG J0329-0212 ClG 03 29 41.6 -02 11 47           ~ 142 0
5 NAME Hubble Ultra Deep Field reg 03 32 39.0 -27 47 29           ~ 1675 0
6 MCS J0416.1-2403 ClG 04 16 08.380 -24 04 20.80           ~ 338 0
7 ClG J0451+0006 ClG 04 51 54.6 +00 06 19           ~ 53 0
8 ACT-CL J0520.7-1328 ClG 05 20 42.0 -13 28 49           ~ 34 0
9 ClG 0657-56 ClG 06 58 29.6 -55 56 39           ~ 965 1
10 ACT-CL J0940.8+0744 ClG 09 40 53.0 +07 44 25           ~ 14 0
11 MCS J1206.2-0847 ClG 12 06 12.2 -08 48 02           ~ 246 0
12 ClG J1347-1145 ClG 13 47 30.5 -11 45 07           ~ 548 0
13 SMACS J2031.8-4036 ClG 20 31 47.843 -40 36 54.76           ~ 21 0
14 ACT-CL J2131.0-4019 ClG 21 31 04.917 -40 19 21.04           ~ 12 0
15 ACO 2390 ClG 21 53 37.4 +17 41 46           ~ 689 2
16 ACT-CL J2214.9-1359 ClG 22 14 57.3 -14 00 12           ~ 88 0
17 ACO S 1063 ClG 22 48 45.4 -44 31 42           ~ 321 0
18 ACO 2667 ClG 23 51 39.37 -26 05 02.7           ~ 176 0

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