2024MNRAS.527.5808B

Query : 2024MNRAS.527.5808B

2024MNRAS.527.5808B - Mon. Not. R. Astron. Soc., 527, 5808-5828 (2024/January-3)

The ALMA REBELS survey: obscured star formation in massive Lyman-break galaxies at z= 4-8 revealed by the IRX-β and M⋆ relations.

BOWLER R.A.A., INAMI H., SOMMOVIGO L., SMIT R., ALGERA H.S.B., ARAVENA M., BARRUFET L., BOUWENS R., DA CUNHA E., CULLEN F., DAYAL P., DE LOOZE I., DUNLOP J.S., FUDAMOTO Y., MAUERHOFER V., McLURE R.J., STEFANON M., SCHNEIDER R., FERRARA A., GRAZIANI L., HODGE J.A., NANAYAKKARA T., PALLA M., SCHOUWS S., STARK D.P. and VAN DER WERF P.P.

Abstract (from CDS):

We investigate the degree of dust obscured star formation in 49 massive (log10(M⋆/M⊙) > 9) Lyman-break galaxies (LBGs) at z = 6.5-8 observed as part of the Atacama Large Millimeter/submillimeter Array (ALMA) Reionization Era Bright Emission Line Survey (REBELS) large program. By creating deep stacks of the photometric data and the REBELS ALMA measurements we determine the average rest-frame ultraviolet (UV), optical, and far-infrared (FIR) properties which reveal a significant fraction (fobs = 0.4-0.7) of obscured star formation, consistent with previous studies. From measurements of the rest-frame UV slope, we find that the brightest LBGs at these redshifts show bluer (β ≃ -2.2) colours than expected from an extrapolation of the colour-magnitude relation found at fainter magnitudes. Assuming a modified blackbody spectral energy distribution (SED) in the FIR (with dust temperature of $T_{\rm d} = 46\, {\rm K}$ and βd = 2.0), we find that the REBELS sources are in agreement with the local 'Calzetti-like' starburst Infrared-excess (IRX)-β relation. By re-analysing the data available for 108 galaxies at z ≃ 4-6 from the ALMA Large Program to Investigate C+ at Early Times (ALPINE) using a consistent methodology and assumed FIR SED, we show that from z ≃ 4-8, massive galaxies selected in the rest-frame UV have no appreciable evolution in their derived IRX-β relation. When comparing the IRX-M⋆ relation derived from the combined ALPINE and REBELS sample to relations established at z < 4, we find a deficit in the IRX, indicating that at z > 4 the proportion of obscured star formation is lower by a factor of ≳ 3 at a given a M⋆. Our IRX-β results are in good agreement with the high-redshift predictions of simulations and semi-analytic models for z ≃ 7 galaxies with similar stellar masses and star formation rates.

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

Journal keyword(s): dust, extinction - galaxies: evolution - galaxies: high-redshift

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 ACO 2744 ClG 00 14 20.03 -30 23 17.8           ~ 1077 0
2 [ARK2015] 4877 LeG 00 14 24.8114 -30 22 56.118           ~ 23 0
3 [ZSM2014] YD1 LeG 00 14 24.925 -30 22 54.86           ~ 11 0
4 [ARK2015] 4886 LeG 00 14 24.927 -30 22 56.15           ~ 85 0
5 NAME SMC G 00 52 38.0 -72 48 01   2.79 2.2     ~ 12317 1
6 REBELS-01 G 02 16 25.092 -04 57 38.50           ~ 6 0
7 REBELS-02 G 02 16 32.43 -05 30 05.6           ~ 5 0
8 CANDELS UDS F160W J021715.24-050745.6 G 02 17 15.2462 -05 07 45.657           ~ 11 0
9 REBELS-04 G 02 17 42.470 -04 58 57.80           ~ 6 0
10 NAME XMM-LSS Field reg 02 18 00 -07 00.0           ~ 347 0
11 REBELS-05 G 02 18 11.50 -05 00 59.4           ~ 16 0
12 REBELS-06 G 02 18 47.47 -05 10 20.3           ~ 6 0
13 REBELS-07 G 02 18 56.536 -05 19 58.92           ~ 44 0
14 REBELS-08 G 02 19 35.140 -05 23 19.31           ~ 13 0
15 REBELS-09 G 02 21 54.150 -04 24 12.29           ~ 5 0
16 REBELS-10 G 02 22 32.59 -04 56 51.2           ~ 5 0
17 REBELS-11 G 02 24 39.35 -04 48 30.0           ~ 4 0
18 REBELS-12 G 02 25 07.94 -05 06 40.7           ~ 21 0
19 REBELS-13 G 02 26 16.50 -04 07 04.0           ~ 6 0
20 REBELS-14 G 02 26 46.190 -04 59 53.57           ~ 17 0
21 REBELS-15 G 02 27 13.120 -04 17 59.25           ~ 10 0
22 NAME Extended Chandra Deep Field South reg 03 32 30.0 -27 48 20           ~ 862 0
23 NAME Hubble Ultra Deep Field reg 03 32 39.0 -27 47 29           ~ 1900 0
24 REBELS-16 G 04 29 37.20 -02 53 49.1           ~ 5 0
25 COSMOS2015 516548 G 09 57 37.000 +02 05 11.32           ~ 8 0
26 COSMOS2015 689079 G 09 57 47.90 +02 20 43.7           ~ 21 0
27 REBELS-19 G 09 57 54.690 +02 27 54.90           ~ 13 0
28 COSMOS2015 494057 EmG 09 58 28.52 +02 03 06.8 27.59 28.369 27.394 26.16 24.65 ~ 67 0
29 COSMOS2015 776817 G 09 58 46.200 +02 28 45.76           ~ 13 0
30 COSMOS2015 245166 G 09 58 58.270 +01 39 20.19           ~ 13 0
31 REBELS-P2 G 09 59 02.566 +02 38 06.05           ~ 7 0
32 REBELS-P3 G 09 59 09.621 +02 45 09.68           ~ 7 0
33 COSMOS2015 541149 G 09 59 15.89 +02 07 32.0           ~ 6 0
34 COSMOS2015 969849 G 09 59 19.360 +02 46 41.40           ~ 10 0
35 COSMOS2015 651241 G 09 59 20.35 +02 17 22.7           ~ 4 0
36 HSCS J100004+015835 G 10 00 04.360 +01 58 35.53           ~ 11 0
37 REBELS-P4 G 10 00 12.51 +02 03 00.5           ~ 8 0
38 COSMOS2015 848185 EmG 10 00 21.504 +02 35 11.08   27.450 26.872     ~ 68 0
39 COSMOS2015 334704 G 10 00 28.13 +01 47 54.4           ~ 8 0
40 NAME COSMOS Field reg 10 00 28.60 +02 12 21.0           ~ 3639 0
41 REBELS-P6 G 10 00 29.870 +02 13 02.47           ~ 33 0
42 REBELS-P7 G 10 00 29.89 +01 46 46.4           ~ 10 0
43 CANDELS COSMOS F160W J100030.18+021559.7 G 10 00 30.19 +02 15 59.8           ~ 53 0
44 REBELS-24 G 10 00 31.89 +01 57 50.2           ~ 9 0
45 REBELS-25 G 10 00 32.322 +01 44 31.26           ~ 39 0
46 COSMOS2015 481451 G 10 00 42.130 +02 01 56.87           ~ 12 0
47 COSMOS2015 877552 G 10 00 43.38 +02 37 51.8           ~ 19 0
48 REBELS-27 G 10 00 58.485 +01 49 55.96           ~ 18 0
49 COSMOS2015 888219 G 10 01 04.60 +02 38 56.7           ~ 6 0
50 COSMOS2015 876803 G 10 01 36.86 +02 37 49.3           ~ 25 0
51 COSMOS2015 743699 G 10 01 52.31 +02 25 42.3           ~ 17 0
52 COSMOS2015 824866 G 10 01 58.50 +02 33 08.5           ~ 12 0
53 REBELS-32 G 10 01 59.060 +01 53 27.75           ~ 15 0
54 COSMOS2015 607297 G 10 02 03.82 +02 13 25.1           ~ 7 0
55 COSMOS2015 607293 G 10 02 06.49 +02 13 24.1           ~ 16 0
56 COSMOS2015 839149 G 10 02 06.70 +02 34 21.4           ~ 5 0
57 COSMOS2020 Classic 1151531 G 10 02 12.558 +02 30 45.71           ~ 15 0
58 REBELS-37 G 10 02 31.810 +02 31 17.10           ~ 8 0
59 COSMOS2015 923550 G 10 02 54.040 +02 42 11.94           ~ 18 0
60 HSCS J100305+021842 G 10 03 05.250 +02 18 42.75           ~ 21 0
61 ALMA J131129.9-011918 G 13 11 29.93 -01 19 18.7           ~ 91 0
62 [BBZ2012] A1703-zD1 EmG 13 14 59.4183 +51 50 00.843           ~ 21 0
63 REBELS-40 G 23 50 34.660 -43 32 32.50           ~ 12 0

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