2023MNRAS.524.5454L

Query : 2023MNRAS.524.5454L

2023MNRAS.524.5454L - Mon. Not. R. Astron. Soc., 524, 5454-5467 (2023/October-1)

The UV luminosity functions of bright z > 8 galaxies: determination from ∼0.41 deg2 of HST observations along ∼300 independent sightlines.

LEETHOCHAWALIT N., ROBERTS-BORSANI G., MORISHITA T., TRENTI M. and TREU T.

Abstract (from CDS):

We determine the bright end of the rest-frame UV luminosity function (UVLF) at z = 8-10 by selecting bright z ≳ 8 photometric candidates from the largest systematic compilation of HST (pure-)parallel observations to date, the Super-Brightest-of-Reionizing-Galaxies (SuperBoRG) data set. The data set includes ∼300 independent sightlines from WFC3 observations, totalling 800-1300 arcmin2 (depending on redshift). We identify 31 z ≳ 8 candidates via colour selection and photo-z analysis with observed magnitude (24.1 < H160 < 26.6) and 1σ range probability of $58\!-\!95~{{\ \rm per\ cent}}$ of being true high-z galaxies. Following detailed completeness and source recovery simulations, as well as modelling of interloper contamination, we derive rest-frame UVLFs at z = 8-10 down to MUV ≃ -23. We find that the bright end of the galaxy luminosity function can be described both by a Schechter and by a double power-law function, with our space-based large area determination showing some tentative discrepancies with the luminosity functions derived from ground-based observations at the same redshifts. We identify two possible explanations. The first is that the UVLF includes a substantial contribution from AGNs at magnitudes MUV < -22. The UVLF we derive at z = 8 is consistent with no evolution of the bright end from z = 6-7 UVLFs that include AGNs. An alternative (and non-exclusive) possibility is that the dust content of the observed galaxies decreases with redshift, thereby countering the naturally expected decrease in the UV luminosity functions because of a decreased star-formation rate with increasing redshift. Both scenarios raise interesting prospects to further understand galaxy formation in extreme objects during the epoch of reionization.

Abstract Copyright: © 2023 The Author(s) Published by Oxford University Press on behalf of Royal Astronomical Society

Journal keyword(s): galaxies: high-redshift - galaxies: luminosity function, mass function

Simbad objects: 33

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Number of rows : 33
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 sBoRG 0037-3337 563 G 00 37 12.0 -33 37 27           ~ 2 0
2 sBoRG 0104+0021 339 G 01 03 30.8 +00 20 13           ~ 2 0
3 sBoRG 0314-6712 553 G 03 13 47.9 -67 12 35           ~ 3 0
4 NAME Hubble Ultra Deep Field reg 03 32 39.0 -27 47 29           ~ 1900 0
5 sBoRG 0409-5317 313 G 04 09 20.9 -53 15 32           ~ 2 0
6 BoRG 0440-5244 682 G 04 39 46.9402 -52 43 55.258           ~ 7 0
7 sBoRG 0728+0509 232 G 07 27 38.2 +05 07 52           ~ 2 0
8 sBoRG 0830+6555 244 G 08 30 12.5 +65 54 13           ~ 2 0
9 BoRG 0853+0310 145 G 08 52 44.520 +03 08 48.10           ~ 6 0
10 sBoRG 0859+4114 138 G 08 59 18.0 +41 13 25           ~ 2 0
11 sBoRG 0859+4114 718 G 08 59 21.6 +41 14 16           ~ 2 0
12 sBoRG 0925+1400 899 G 09 25 09.0 +13 59 57           ~ 2 0
13 sBoRG 0948+5757 697 G 09 48 17.4 +57 57 18           ~ 2 0
14 sBoRG 0955+4528 914 G 09 55 18.7 +45 29 22           ~ 2 0
15 sBoRG 0956+2848 986 G 09 56 23.1 +28 48 34           ~ 2 0
16 NAME COSMOS Field reg 10 00 28.60 +02 12 21.0           ~ 3639 0
17 sBoRG 1017-2052 310 G 10 17 22.1 -20 52 11           ~ 2 0
18 BoRG 1033+5051 126 G 10 32 44.7144 +50 50 30.072           ~ 7 0
19 sBoRG 1104+2813 447 G 11 03 53.3 +28 13 47           ~ 2 0
20 sBoRG 1115+2548 455 G 11 14 38.9 +25 48 03           ~ 2 0
21 sBoRG 1142+3020 67 G 11 42 33.7 +30 18 10           ~ 2 0
22 sBoRG 1149+2202 343 G 11 48 38.0 +22 01 20           ~ 2 0
23 sBoRG 1149+2202 169 G 11 48 41.4 +22 01 02           ~ 2 0
24 sBoRG 1218+3008 638 G 12 18 13.9 +30 07 32           ~ 2 0
25 sBoRG 1420+3743 1025 G 14 20 14.3 +37 44 08           ~ 2 0
26 BoRG 1437+5043 1137 G 14 36 50.560 +50 43 33.69           ~ 11 0
27 BoRG 1459+7146 785 G 14 58 53.7 +71 46 53           ~ 3 0
28 sBoRG 1515-1517 698 G 15 14 58.6 -15 16 13           ~ 2 0
29 sBoRG 1558+0812 601 G 15 58 16.7 +08 12 30           ~ 2 0
30 sBoRG 1607+1332 996 G 16 06 48.4 +13 32 48           ~ 2 0
31 sBoRG 1917-3335 929 G 19 17 24.5 -33 35 33           ~ 2 0
32 sBoRG 2134-0708 2928 G 21 34 12.2 -07 07 21           ~ 2 0
33 BoRG 2203+1851 1061 G 22 02 46.3297 +18 51 29.515           ~ 7 0

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