Obscured star formation at z=0.84 with HiZELS☆: the relationship between star formation rate and Hα or ultraviolet dust extinction

被引：87

作者：

Garn, Timothy ^{[1
]}

Sobral, David ^{[1
]}

Best, Philip N. ^{[1
]}

Geach, James E. ^{[2
]}

Smail, Ian ^{[2
]}

Cirasuolo, Michele ^{[3
]}

Dalton, Gavin B. ^{[4
,5
]}

Dunlop, James S. ^{[1
]}

McLure, Ross J. ^{[1
]}

Farrah, Duncan ^{[6
]}

机构：

[1] Royal Observ, Inst Astron, SUPA, Edinburgh EH9 3HJ, Midlothian, Scotland

[2] Univ Durham, Inst Computat Cosmol, Durham DH1 3LE, England

[3] Royal Observ, Astron Technol Ctr, Edinburgh EH9 3HJ, Midlothian, Scotland

[4] Univ Oxford, Dept Phys, Oxford OX1 3RH, England

[5] HSIC, Rutherford Appleton Lab, Didcot OX11 0QX, Oxon, England

[6] Univ Sussex, Dept Phys & Astron, Ctr Astron, Brighton BN1 9QJ, E Sussex, England

来源：

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY | 2010年 / 402卷 / 03期

关键词：

galaxies: evolution; galaxies: high-redshift; galaxies: ISM; infrared: galaxies; VLA-COSMOS SURVEY; ACTIVE GALACTIC NUCLEI; FORMATION RATE DENSITY; HIGH-REDSHIFT SURVEY; FORMING GALAXIES; LUMINOSITY FUNCTION; DEEP SURVEY; STARBURST GALAXIES; SOURCE CATALOG; SKY SURVEY;

D O I：

10.1111/j.1365-2966.2009.16042.x

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We compare H alpha, ultraviolet (UV) and infrared (IR) indicators of star formation rate (SFR) for a well-defined sample of z = 0.84 emission-line galaxies from the High-z Emission Line Survey (HiZELS). Using emission-line, optical, IR, radio and X-ray diagnostics, we estimate that 5-11 per cent of H alpha emitters at this redshift are active galactic nuclei. We detect 35 per cent of the H alpha emitters individually at 24 mu m, and stack the locations of star-forming emitters on deep 24-mu m Spitzer Space Telescope images in order to calculate the typical SFRs of our H alpha-emitting galaxies. These are compared to the observed H alpha line fluxes in order to estimate the extinction at z = 0.84, and we find a significant increase in dust extinction for galaxies with higher SFRs. We demonstrate that the relationship between SFR and extinction found in the local Universe is also suitable for our high-redshift galaxies, and attribute the overall increase in the typical dust extinction for z = 0.84 galaxies to an increase in the average SFR, rather than to a change in dust properties at higher redshift. We calculate the UV extinction, and find a similar dependence on SFR to the H alpha results, but no evidence for a 2175 A UV bump in the dust attenuation law for high-redshift star-forming galaxies. By comparing H alpha and UV indicators, we calculate the conversion between the dust attenuation of nebular and stellar radiation, gamma, and show that gamma = 0.50 +/- 0.14. The extinction/SFR relationship is shown to be applicable to galaxies with a range of morphologies and bulge-to-disc ratios, to both merging and non-merging galaxies, and to galaxies within high- and low-density environments, implying that it is a fundamental property of star-forming regions. In order to allow future studies to easily correct for a SFR-dependent amount of dust extinction, we present an equation to predict the extinction of a galaxy, based solely on its observed H alpha luminosity, and use this to recalculate the H alpha luminosity function and SFR density at z = 0.84.

引用

页码：2017 / 2030

页数：14

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