2017ApJ...847...21F

Query : 2017ApJ...847...21F

2017ApJ...847...21F - Astrophys. J., 847, 21-21 (2017/September-3)

Are high-redshift galaxies hot? Temperature of z > 5 galaxies and implications for their dust properties.

FAISST A.L., CAPAK P.L., YAN L., PAVESI R., RIECHERS D.A., BARISIC I., COOKE K.C., KARTALTEPE J.S. and MASTERS D.C.

Abstract (from CDS):

Recent studies have found a significant evolution and scatter in the relationship between the UV spectral slope (βUV) and the infrared excess (IRX; LIR/LUV) at z > 4, suggesting different dust properties of these galaxies. The total far-infrared (FIR) luminosity is key for this analysis, but it is poorly constrained in normal (main-sequence) star-forming z > 5 galaxies, where often only one single FIR point is available. To better inform estimates of the FIR luminosity, we construct a sample of local galaxies and three low-redshift analogues of z > 5 systems. The trends in this sample suggest that normal high-redshift galaxies have a warmer infrared (IR) spectral energy distribution (SED) compared to average z < 4 galaxies that are used as priors in these studies. The blueshifted peak and mid-IR excess emission could be explained by a combination of a larger fraction of metal-poor interstellar medium being optically thin to ultraviolet (UV) light and a stronger UV radiation field due to high star formation densities. Assuming a maximally warm IR SED suggests a 0.6 dex increase in total FIR luminosities, which removes some tension between the dust attenuation models and observations of the IRX-β relation at z > 5. Despite this, some galaxies still fall below the minimum IRX-β relation derived with standard dust cloud models. We propose that radiation pressure in these highly star-forming galaxies causes a spatial offset between dust clouds and young star-forming regions within the lifetime of O/B stars. These offsets change the radiation balance and create viewing-angle effects that can change UV colors at fixed IRX. We provide a modified model that can explain the location of these galaxies on the IRX-β diagram.

Abstract Copyright: © 2017. The American Astronomical Society. All rights reserved.

Journal keyword(s): dust, extinction - galaxies: formation - galaxies: ISM - galaxies: ISM

CDS comments: Table 4: HZ6a-c and HZ10W are not in SIMBAD.

Simbad objects: 47

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Number of rows : 47
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 [SZS2014] A68/h7 LeG 00 37 01 +47 00.0           ~ 3 0
2 [SKS2005] A68 C0 G 00 37 08 +09 09.5           ~ 6 1
3 [SZS2014] A68/HLS115 LeG 00 37 09.500 +09 09 03.97           ~ 6 0
4 [SZS2014] A68/nn4 LeG 00 37 10 +42 00.0           ~ 4 0
5 NAME SMC G 00 52 38.0 -72 48 01   2.79 2.2     ~ 12317 1
6 [PNL2019] 191313 G 02 26 27.03 -04 52 38.3           ~ 33 0
7 HSCS J022802-041618 G 02 28 02.960 -04 16 18.05           ~ 28 1
8 [ADW2016b] IDX34 G 03 32 35.75 -27 46 36.7           ~ 2 0
9 [ADW2016b] ID49 G 03 32 36.60 -27 46 22.1           ~ 5 0
10 [ADW2016b] ID52 G 03 32 36.91 -27 46 51.7           ~ 6 0
11 JADES-GS+053.15407-27.76607 EmG 03 32 36.972 -27 45 57.60           ~ 27 0
12 [ADW2016b] ID44 G 03 32 37.355 -27 46 24.57           ~ 10 0
13 UDF 8545 G 03 32 37.46 -27 46 32.7           ~ 8 0
14 [ADW2016b] ID41 G 03 32 38.14 -27 46 04.8           ~ 5 0
15 MUSE-WIDE 723221090 EmG 03 32 38.17 -27 46 17.3           ~ 6 0
16 JADES-GS+053.15953-27.77152 EmG 03 32 38.282 -27 46 17.22   29.3328 30.49     ~ 28 0
17 MUSE-WIDE 723141081 EmG 03 32 38.451 -27 46 19.87           ~ 7 0
18 [ADW2016b] ID9 G 03 32 38.81 -27 46 34.3           ~ 7 0
19 [ADW2016b] ID2 G 03 32 39.394 -27 46 11.17           ~ 5 0
20 MUSE-WIDE 723121079 EmG 03 32 39.503 -27 46 49.44           ~ 9 0
21 ACT-S J034640-520505 rG 03 46 41.190 -52 05 05.50           ~ 49 0
22 NGC 1568 GiG 04 24 25.3298180688 -00 44 46.187905056   14.9       ~ 40 0
23 ClG J0451+0006 ClG 04 51 54.6 +00 06 19           ~ 57 0
24 NAME LMC G 05 23 34.6 -69 45 22     0.4     ~ 19090 0
25 COSMOS2015 494057 EmG 09 58 28.52 +02 03 06.8 27.59 28.369 27.394 26.16 24.65 ~ 67 0
26 COSMOS2015 547226 EmG 09 59 30.47 +02 08 02.7 27.88 27.17   26.64 25.04 ~ 31 0
27 2QZ J095940.1+015121 EmG 09 59 40.26096 +01 51 21.5100 21.09 20.58 20.71   20.15 ~ 18 0
28 COSMOS2015 711112 G 09 59 51.697 +02 22 42.16           ~ 35 0
29 COSMOS2015 536534 EmG 09 59 53.250 +02 07 05.60     27.16 27.87 25.65 ~ 45 0
30 [CCJ2015b] HZ8W G 10 00 03.971 +02 37 36.23           ~ 8 0
31 COSMOS2015 873321 EmG 10 00 04.05 +02 37 35.9     27.494 26.12 24.35 ~ 50 0
32 COSMOS2015 683613 EmG 10 00 09.431 +02 20 13.86         25.88 ~ 42 0
33 AS2COS 0059.1 rG 10 00 20.690 +02 35 20.37           ~ 116 0
34 COSMOS2015 848185 EmG 10 00 21.504 +02 35 11.08   27.450 26.872     ~ 68 0
35 [CBH2010] 150.116043+01.951000 G 10 00 27.850 +01 57 03.60           ~ 3 0
36 NAME COSMOS Field reg 10 00 28.60 +02 12 21.0           ~ 3639 0
37 COSMOS 1259183 G 10 00 35.731 +02 01 13.35 20.773 20.528 20.000 19.922 19.807 ~ 17 0
38 [CCJ2015b] HZ5a G 10 00 51.520 +02 34 59.29           ~ 4 0
39 COSMOS2015 845652 QSO 10 00 51.59 +02 34 57.6           ~ 39 0
40 COSMOS2015 180331 EmG 10 00 59.300 +01 33 19.60           ~ 59 0
41 COSMOS2015 417567 EmG 10 02 04.098 +01 55 44.05           ~ 39 0
42 Z 351-62 bCG 11 27 59.90 +78 59 39.0   14.50       ~ 346 1
43 NAME SMM J123711+622212 rG 12 37 11.92 +62 22 12.1   27.1786 25.185   24.4196 ~ 237 0
44 NGC 5253 rG 13 39 55.990 -31 38 24.11 11.48 10.94 10.49 10.33 13.47 ~ 1421 4
45 SPT-S J231922-5557.9 rG 23 19 22.200 -55 57 57.80           ~ 21 0
46 SPT-S J235149-5722.2 rG 23 51 51.030 -57 22 16.40           ~ 11 0
47 SPT-S J235339-5010.1 rG 23 53 39.22 -50 10 08.2           ~ 11 0

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