2011A&A...533A..93B


Query : 2011A&A...533A..93B

2011A&A...533A..93B - Astronomy and Astrophysics, volume 533A, 93-93 (2011/9-1)

GOODS-Herschel: evidence of a UV extinction bump in galaxies at z > 1.

BUAT V., GIOVANNOLI E., HEINIS S., CHARMANDARIS V., COIA D., DADDI E., DICKINSON M., ELBAZ D., HWANG H.S., MORRISON G., DASYRA K., AUSSEL H., ALTIERI B., DANNERBAUER H., KARTALTEPE J., LEITON R., MAGDIS G., MAGNELLI B. and POPESSO P.

Abstract (from CDS):

Dust attenuation curves in external galaxies are useful for studying their dust properties as well as interpreting their intrinsic spectral energy distributions. These functions are not very well known in the UV range whether at low or high redshift. In particular, the presence or absence of a UV bump at 2175Å remains an open issue that has consequences on the interpretation of broad band colours of galaxies involving the UV range. We want to study the dust attenuation curve in the UV range at z>1 where the UV is redshifted into the visible and with Herschel data to constrain dust emission and a global dust attenuation. In particular, we search for a UV bump and related implications for dust attenuation determinations. We use deep photometric data of the Chandra Deep Field South obtained with intermediate and broad band filters by the MUSYC project to sample the UV rest frame of galaxies with 1<z<2. Herschel/PACS and Spitzer/MIPS data are used to measure the dust emission. We select 30 galaxies with high S/N in all bands. Their SEDs from the UV to the far-IR are fitted using the CIGALE code and the characteristics of the dust attenuation curves obtained as Bayesian outputs of the SED fitting process. The mean dust attenuation curve we derive exhibits a significant UV bump at 2175Å whose amplitude corresponds to 35% (76%) that of the Milky Way (Large Magellanic Cloud: LMC2 supershell) extinction curve. An analytical expression of the average attenuation curve (A(λ)/AV) is given and found to be slightly steeper than the Calzetti et al. (1994ApJ...429..582C) one, although at a 1σ level. Our galaxy sample is used to study the derivation of the slopes of the UV continuum from broad band colours, including the rest frame GALEX FUV-NUV colour. Systematic errors induced by the presence of the bump are quantified. We compare dust attenuation factors measured with CIGALE to the slope of the UV continuum and find that there is a large scatter around the relation valid for local starbursts (∼0.7mag). The uncertainties on the determination of the UV slope lead to an extra systematic error in a range of 0.3 to 0.7mag on dust attenuation when a filter overlaps the UV bump.

Abstract Copyright:

Journal keyword(s): galaxies: high-redshift - galaxies: ISM - ultraviolet: galaxies - infrared: galaxies - dust, extinction

Simbad objects: 36

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Number of rows : 36
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2021
#notes
1 NAME SMC G 00 52 38.0 -72 48 01   2.79 2.2     ~ 9904 1
2 NAME Magellanic Clouds GrG 03 00 -71.0           ~ 6020 1
3 CXOCDFS J033206.4-274728 EmG 03 32 06.43519 -27 47 28.7844   23.7799   22.728 21.488 ~ 41 0
4 EIS-DEEP CDFS-1 Ks 1 688 EmG 03 32 10.58 -27 47 06.2   23.6822 23.263 22.92 22.5927 ~ 17 0
5 CXOCDFS J033215.8-274630 QSO 03 32 15.8020 -27 46 30.510   23.8491 23.625 23.10 23.0526 ~ 27 0
6 EIS-DEEP CDFS-1 J 1 343 G 03 32 16.493 -27 44 49.03   23.126 23.28 23.779   ~ 19 0
7 ATCDFS J033217.22-275222.4 Sy2 03 32 17.16818 -27 52 20.6936   23.445   23.572 22.283 ~ 61 0
8 EIS-DEEP CDFS-1 J 1 906 G 03 32 17.76010 -27 46 39.9968   24.3306   24.226 23.8462 ~ 15 0
9 EIS-DEEP CDFS-1 J 1 363 G 03 32 20.723 -27 44 53.83   22.307   23.253 21.4327 ~ 26 0
10 EIS-DEEP CDFS-3 Ks 1 343 AGN 03 32 25.86060 -27 50 19.6541   23.1895 22.7 23.234 21.866 ~ 29 0
11 NAME Chandra Deep Field-South reg 03 32 28.0 -27 48 30           ~ 1896 1
12 EIS-DEEP CDFS-1 Ks 1 844 AGN 03 32 28.77948 -27 47 55.3117   25.074 24.652 24.068 23.640 ~ 23 0
13 EIS-DEEP CDFS-4 J 1 820 EmG 03 32 28.98574 -27 49 08.2135   22.016   22.736 21.032 ~ 21 0
14 [LBX2017] 554 AGN 03 32 29.951 -27 43 01.60   23.8445 24.06 24.49 23.6848 ~ 23 0
15 2XMM J033229.9-274528 Sy1 03 32 29.980 -27 45 29.91 21.66 21.1307 21.33 21.298 21.1036 ~ 69 1
16 CXOCDFS J033231.8-274958 EmG 03 32 31.807 -27 49 58.39   23.5731   22.618 22.107 ~ 18 0
17 EIS-DEEP CDFS-4 H 1 663 EmG 03 32 34.05264 -27 50 28.9594   24.164   23.828 23.137 ~ 19 0
18 CXOCDFS J033234.6-275324 EmG 03 32 34.601 -27 53 24.41   23.2887   22.624 22.3291 ~ 24 0
19 ASPECS LP.3mm.14 EmG 03 32 34.857 -27 46 40.49 25.3738 25.0497 24.212 23.84 23.3007 ~ 37 0
20 CXOCDFS J033236.0-274851 QSO 03 32 35.974 -27 48 50.40 24.39 22.3798   22.413 21.847 ~ 49 0
21 CXOCDFS J033236.0-274423 AGN 03 32 36.02609 -27 44 23.8981   23.2185 22.9 23.245 22.171 ~ 28 0
22 [LBX2017] 685 IG 03 32 36.172 -27 42 58.31 24.09 22.3641 22.145 21.808 21.5928 ~ 18 0
23 EIS-DEEP CDFS-2 J 1 1254 G 03 32 37.404 -27 44 06.98   23.866   24.958 21.508 ~ 18 0
24 [AMK2006] 48a AGN 03 32 37.75162 -27 50 00.7692   24.0727   23.953 24.0541 ~ 13 0
25 2XMM J033237.7-275211 Sy2 03 32 37.76746 -27 52 12.2617   25.2146 24.717 24.68 24.1108 ~ 72 0
26 ASPECS LP.3mm.06 QSO 03 32 39.883 -27 47 15.06 23.3163 23.0619 22.604 22.41 21.765 ~ 46 0
27 EIS-DEEP CDFS-2 Ks 1 2303 AGN 03 32 40.055 -27 47 55.42 25.2984 24.0577 23.690 23.701 23.084 ~ 47 0
28 CXOCDFS J033240.7-274926 G 03 32 40.752 -27 49 26.17   24.2478 24.339 23.905 23.381 ~ 32 0
29 EIS-DEEP CDFS-2 J 1 605 G 03 32 41.330 -27 45 38.38   24.249 23.969     ~ 12 0
30 EIS-DEEP CDFS-2 Ks 1 1812 G 03 32 41.837 -27 46 57.12 25.5597 24.6765 24.416   24.1432 ~ 19 0
31 EIS-DEEP CDFS-2 Ks 1 2223 G 03 32 42.283 -27 47 46.08 22.9979 22.8804 22.36 22.881 21.6176 ~ 43 0
32 EIS-DEEP CDFS-2 J 1 626 G 03 32 43.4889 -27 45 56.392   23.7126   23.14 22.7132 ~ 12 0
33 EIS-DEEP CDFS-4 H 1 810 G 03 32 47.16895 -27 51 06.0772   23.596   24.526 23.0469 ~ 13 0
34 NAME LMC G 05 23 34.6 -69 45 22     0.4     ~ 15530 1
35 NAME LMC 2 Supergiant Shell sh 05 41 27 -69 22.4           ~ 175 0
36 NAME COSMOS Field reg 10 00 28.60 +02 12 21.0           ~ 2337 0

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2021.09.19-03:19:10

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