2016A&A...587A..98W


Query : 2016A&A...587A..98W

2016A&A...587A..98W - Astronomy and Astrophysics, volume 587A, 98-98 (2016/3-1)

Extended Lyman α haloes around individual high-redshift galaxies revealed by MUSE.

WISOTZKI L., BACON R., BLAIZOT J., BRINCHMANN J., HERENZ E.C., SCHAYE J., BOUCHE N., CANTALUPO S., CONTINI T., CAROLLO C.M., CARUANA J., COURBOT J.-B., EMSELLEM E., KAMANN S., KERUTT J., LECLERCQ F., LILLY S.J., PATRICIO V., SANDIN C., STEINMETZ M., STRAKA L.A., URRUTIA T., VERHAMME A., WEILBACHER P.M. and WENDT M.

Abstract (from CDS):

We report the detection of extended Lyα emission around individual star-forming galaxies at redshifts z=3-6 in an ultradeep exposure of the Hubble Deep Field South obtained with MUSE on the ESO-VLT. The data reach a limiting surface brightness (1σ) of ∼1x10–19erg/s/cm2/arcsec2 in azimuthally averaged radial profiles, an order of magnitude improvement over previous narrowband imaging. Our sample consists of 26 spectroscopically confirmed Lyα-emitting, but mostly continuum-faint (mAB>27) galaxies. In most objects the Lyα emission is considerably more extended than the UV continuum light. While five of the faintest galaxies in the sample show no significantly detected Lyα haloes, the derived upper limits suggest that this is due to insufficient S/N. Lyα haloes therefore appear to be ubiquitous even for low-mass (∼108-109M) star-forming galaxies at z>3. We decompose the Lyα emission of each object into a compact component tracing the UV continuum and an extended halo component, and infer sizes and luminosities of the haloes. The extended Lyα emission approximately follows an exponential surface brightness distribution with a scale length of a few kpc. While these haloes are thus quite modest in terms of their absolute sizes, they are larger by a factor of 5-15 than the corresponding rest-frame UV continuum sources as seen by HST. They are also much more extended, by a factor ∼5, than Lyα haloes around low-redshift star-forming galaxies. Between ∼40% and >90% of the observed Lyα flux comes from the extended halo component, with no obvious correlation of this fraction with either the absolute or the relative size of the Lyα halo. Our observations provide direct insights into the spatial distribution of at least partly neutral gas residing in the circumgalactic medium of low to intermediate mass galaxies at z>3.

Abstract Copyright:

Journal keyword(s): galaxies: high-redshift - galaxies: evolution - galaxies: formation - cosmology: observations - intergalactic medium

Simbad objects: 27

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Number of rows : 27
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2023
#notes
1 [LFR2003] 228 G 22 32 52.0917 -60 33 42.399   25.974 25.045   24.62 ~ 12 0
2 [CDD2000] 2416 G 22 32 52.160 -60 34 10.94     28.41   28.56 ~ 4 0
3 SB-WF 2708-1244 G 22 32 52.300 -60 33 46.73     28.93   28.00 ~ 6 0
4 [BBR2015] 563 G 22 32 52.380 -60 34 01.18           ~ 3 0
5 [CDD2000] 1779 G 22 32 52.570 -60 33 39.92     27.80   27.41 ~ 5 0
6 [BBR2015] 553 G 22 32 52.640 -60 33 55.89           ~ 3 0
7 [CDD2000] 1693 G 22 32 52.700 -60 33 34.85     28.78   27.84 ~ 4 0
8 [BBR2015] 546 G 22 32 53.690 -60 33 41.10           ~ 3 0
9 [BBR2015] 568 G 22 32 53.760 -60 33 35.55           ~ 3 0
10 [BBR2015] 547 G 22 32 53.940 -60 34 06.19           ~ 3 0
11 [BBR2015] 558 G 22 32 54.410 -60 34 02.23           ~ 3 0
12 [LFR2003] 71 G 22 32 54.820 -60 34 14.12   29.008 28.072   25.83 ~ 7 0
13 [LFR2003] 253 G 22 32 55.450 -60 33 40.23 30.508 28.397 27.467   26.40 ~ 7 0
14 [BBR2015] 549 G 22 32 55.630 -60 33 40.70           ~ 3 0
15 [CDD2000] 2326 G 22 32 55.850 -60 34 06.59     28.30   28.69 ~ 5 0
16 NAME HDF-S reg 22 32 56 -60 33.0           ~ 565 0
17 SB-WF 1962-1868 G 22 32 56.370 -60 33 22.15     27.16   27.11 ~ 5 0
18 [CDD2000] 1615 G 22 32 56.420 -60 33 30.47     28.40   27.51 ~ 5 0
19 HDFS J223256.73-603338.5 G 22 32 56.730 -60 33 38.55     28.00   27.26 ~ 7 0
20 [CDD2000] 1881 G 22 32 57.030 -60 33 44.45     29.55   29.06 ~ 4 0
21 [CDD2000] 2009 G 22 32 57.200 -60 33 51.67     28.52   27.93 ~ 5 0
22 [BBR2015] 543 G 22 32 57.470 -60 33 48.56           ~ 2 0
23 SB-WF 1745-1206 G 22 32 57.510 -60 33 48.47   28.33 26.43   26.08 ~ 6 0
24 [CDD2000] 1584 G 22 32 57.940 -60 33 29.10     28.71   28.42 ~ 4 0
25 HDFS J223257.98-603342.3 G 22 32 57.990 -60 33 42.25     28.42   27.92 ~ 8 0
26 [LFR2003] 106 G 22 32 58.600 -60 34 09.01 30.004 29.770 27.467   25.84 ~ 7 0
27 [LFR2003] 520 G 22 32 59.050 -60 33 25.45 31.825 28.374 27.652   26.90 ~ 7 0

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2023.06.01-20:38:45

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