The ultraviolet properties of luminous infrared galaxies at z ∼ 0.7 -: Is there any evolution in their dust attenuation?

被引：39

作者：

Buat, V.

Marcillac, D.

Burgarella, D.

Le Floc'h, E.

Takeuchi, T. T.

Iglesias-Paramo, J.

Xu, C. K.

机构：

[1] Observ Astron Marseille Prov, Astrophys Lab, F-133761 Marseille 12, France

[2] Univ Arizona, Steward Observ, Tucson, AZ 85721 USA

[3] Tohoku Univ, Inst Astron, Aoba Ku, Sendai, Miyagi 9808578, Japan

[4] Nagoya Univ, Inst Adv Res, Chikusa Ku, Nagoya, Aichi 4648601, Japan

[5] CSIC, Inst Astrofis Andalucia, E-18008 Granada, Spain

[6] CALTECH, Pasadena, CA 91125 USA

来源：

ASTRONOMY & ASTROPHYSICS | 2007年 / 469卷 / 01期

关键词：

galaxies : evolution; dust; extinction; infrared : galaxies; ultraviolet : galaxies; STAR-FORMING GALAXIES; DEEP-FIELD-SOUTH; STARBURST GALAXIES; FORMATION HISTORY; NEARBY UNIVERSE; FORMATION RATES; LOCAL UNIVERSE; DISK GALAXIES; SPITZER VIEW; EXTINCTION;

D O I：

10.1051/0004-6361:20066685

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

Aims. The total infrared (TIR: 8-1000 mu m) and far-ultraviolet (FUV: similar to 1500 angstrom) luminosity functions of galaxies and the related luminosity densities rho(TIR) and rho(FUV) are known to evolve at different rates from z = 0 to z similar to 1: the galaxy populations appear to be brighter in the past at both wavelengths, but the evolution in the TIR is larger than in the FUV. This leads to an increase of the ratio of TIR to FUV luminosity densities rho(TIR)/rho(FUV) which can be interpreted as a global increase of the dust attenuation from z = 0 to z similar to 1. Our aim is to understand the origin of this increase: is it entirely due to a variation of the dust attenuation with the luminosity of the galaxies as seen as z = 0 or are properties of galaxies evolving with the redshift? Methods. We focus on infrared galaxies more luminous than L-TIR = 10(11) L-circle dot at z similar to 0.7 observed by SPITZER/MIPS and we measure their ultraviolet emission at 2310 angstrom from GALEX images. These Luminous InfraRed Galaxies (LIRGs) represent the bulk of the TIR luminosity density at intermediate redshift. The analysis of the ratio of TIR to FUV (rest-frame) luminosity (LTIR/LFUV) enables us to discuss and compare their dust attenuation to that of galaxies of similar infrared luminosity selected in the same way in the nearby universe Results. Some evolution of LTIR/LFUV and therefore of dust attenuation is found: LIRGs at z = 0.7 span a larger range of LTIR/LFUV ratios than at z = 0 and their mean dust attenuation at FUV wavelengths is found to be similar to 0.5 mag lower than for their local counterparts. The decrease of dust attenuation is found to be less than that reported in other studies for bright galaxies selected in UV rest-frame at z = 1 and 2. A semi-quantitative analysis accounts for the general increase of dust attenuation with the bolometric luminosity of galaxies: it is found that the slight decrease of dust attenuation for LIRGs at z = 0.7 remains consistent with the increase of rho(TIR)/rho(FUV) with redshift.

引用

页码：19 / 25

页数：7

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