2020MNRAS.493.5120M

Query : 2020MNRAS.493.5120M

2020MNRAS.493.5120M - Mon. Not. R. Astron. Soc., 493, 5120-5130 (2020/April-3)

Elevated ionizing photon production efficiency in faint high-equivalent-width Lyman-α emitters.

MASEDA M.V., BACON R., LAM D., MATTHEE J., BRINCHMANN J., SCHAYE J., LABBE I., SCHMIDT K.B., BOOGAARD L., BOUWENS R., CANTALUPO S., FRANX M., HASHIMOTO T., INAMI H., KUSAKABE H., MAHLER G., NANAYAKKARA T., RICHARD J. and WISOTZKI L.

Abstract (from CDS):

While low-luminosity galaxies dominate number counts at all redshifts, their contribution to cosmic reionization is poorly understood due to a lack of knowledge of their physical properties. We isolate a sample of 35 z ≃ 4-5 continuum-faint Lyman-α emitters from deep VLT/MUSE spectroscopy and directly measure their H α emission using stacked Spitzer/IRAC Ch. 1 photometry. Based on Hubble Space Telescope imaging, we determine that the average UV continuum magnitude is fainter than -16 (≃ 0.01 L*), implying a median Lyman-α equivalent width of 259 Å. By combining the H α measurement with the UV magnitude, we determine the ionizing photon production efficiency, ξion, a first for such faint galaxies. The measurement of log10 (ξion [Hz erg–1]) = 26.28 (+0.28–0.40) is in excess of literature measurements of both continuum- and emission line-selected samples, implying a more efficient production of ionizing photons in these lower luminosity, Lyman-α-selected systems. We conclude that this elevated efficiency can be explained by stellar populations with metallicities between 4 x 10–4 and 0.008, with light-weighted ages less than 3 Myr.

Abstract Copyright: © The Author(s) 2020. Published by Oxford University Press on behalf of The Royal Astronomical Society.

Journal keyword(s): Galaxies: evolution - Galaxies: high-redshift - Galaxies: ISM

Simbad objects: 35

goto Full paper

goto View the references in ADS

Number of rows : 35
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 MUSE-WIDE 606673148 EmG 03 32 32.24647 -27 46 47.2942           ~ 5 0
2 MUSE-WIDE 607803422 EmG 03 32 33.13790 -27 46 46.0914           ~ 5 0
3 MUSE-WIDE 608903620 EmG 03 32 33.16548 -27 47 54.9345           ~ 5 0
4 MUSE-WIDE 605732798 EmG 03 32 34.44424 -27 46 20.0229           ~ 5 0
5 [IBB2017] 6400 G 03 32 34.92471 -27 48 13.9233           ~ 2 0
6 MUSE-WIDE 609303668 EmG 03 32 34.965 -27 48 18.71           ~ 5 0
7 MUSE-WIDE 606963206 EmG 03 32 35.05657 -27 46 33.9501           ~ 5 0
8 [IBB2017] 6408 G 03 32 35.46328 -27 46 21.4127           ~ 3 0
9 MUSE-WIDE 609183648 EmG 03 32 35.53994 -27 47 50.9761           ~ 5 0
10 [IBB2017] 6422 G 03 32 36.37066 -27 48 16.7446           ~ 3 0
11 MUSE-WIDE 609073637 EmG 03 32 36.60950 -27 47 01.6714           ~ 6 0
12 MUSE-WIDE 722060906 EmG 03 32 36.80161 -27 46 52.8070           ~ 5 0
13 MUSE-WIDE 606403099 EmG 03 32 37.14983 -27 47 42.5576           ~ 5 0
14 MUSE-WIDE 609683714 EmG 03 32 37.667 -27 48 58.11           ~ 6 0
15 MUSE-WIDE 606653145 EmG 03 32 37.956 -27 45 37.51           ~ 5 0
16 MUSE-WIDE 607723412 EmG 03 32 38.048 -27 48 01.29           ~ 5 0
17 MUSE-WIDE 608943624 EmG 03 32 38.137 -27 47 21.44           ~ 5 0
18 MUSE-WIDE 607153242 EmG 03 32 38.58575 -27 46 06.1645           ~ 5 0
19 MUSE-WIDE 722380980 EmG 03 32 38.83158 -27 46 39.0143           ~ 5 0
20 MUSE-WIDE 609413681 EmG 03 32 39.180 -27 48 36.01           ~ 6 0
21 MUSE-WIDE 607413341 EmG 03 32 39.51505 -27 48 02.1989           ~ 5 0
22 MUSE-WIDE 608323504 EmG 03 32 39.538 -27 47 35.70           ~ 5 0
23 MUSE-WIDE 608863611 EmG 03 32 40.535 -27 47 47.50           ~ 6 0
24 MUSE-WIDE 609433683 EmG 03 32 40.53664 -27 46 33.0209           ~ 5 0
25 MUSE-WIDE 607823424 EmG 03 32 40.87895 -27 46 42.0715           ~ 6 0
26 MUSE-WIDE 609843736 EmG 03 32 41.44565 -27 46 37.4010           ~ 5 0
27 [IBB2017] 6402 G 03 32 41.61250 -27 47 54.1284           ~ 4 0
28 MUSE-WIDE 605112594 EmG 03 32 42.48539 -27 46 38.7163           ~ 5 0
29 MUSE-WIDE 608153481 EmG 03 32 42.62578 -27 46 11.6742           ~ 5 0
30 MUSE-WIDE 605602781 EmG 03 32 42.67705 -27 46 43.4371           ~ 5 0
31 [IBB2017] 6496 G 03 32 42.89968 -27 48 00.2944           ~ 3 0
32 MUSE-WIDE 609593700 EmG 03 32 42.94774 -27 48 05.7896           ~ 5 0
33 MUSE-WIDE 609213653 EmG 03 32 44.394 -27 47 45.14           ~ 5 0
34 MUSE-WIDE 605702795 EmG 03 32 44.56121 -27 47 34.7594           ~ 5 0
35 MUSE-WIDE 608403512 EmG 03 32 46.75931 -27 47 04.5778           ~ 7 0

To bookmark this query, right click on this link: simbad:objects in 2020MNRAS.493.5120M and select 'bookmark this link' or equivalent in the popup menu