STAR-FORMING OR STARBURSTING? THE ULTRAVIOLET CONUNDRUM

被引：61

作者：

Boquien, M. ^{[1
]}

Calzetti, D. ^{[1
]}

Kennicutt, R. ^{[2
,3
]}

Dale, D. ^{[4
]}

Engelbracht, C. ^{[3
]}

Gordon, K. D. ^{[5
]}

Hong, S. ^{[1
]}

Lee, J. C. ^{[6
]}

Portouw, J. ^{[3
]}

机构：

[1] Univ Massachusetts, Dept Astron, Amherst, MA 01003 USA

[2] Univ Cambridge, Inst Astron, Cambridge CB3 0HA, England

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

[4] Univ Wyoming, Dept Phys & Astron, Laramie, WY 82071 USA

[5] STScI, Baltimore, MD 21218 USA

[6] Carnegie Observ, Pasadena, CA 91101 USA

来源：

ASTROPHYSICAL JOURNAL | 2009年 / 706卷 / 01期

基金：

英国科学技术设施理事会;

关键词：

galaxies: spiral; infrared: galaxies; ultraviolet: galaxies; SMALL-MAGELLANIC-CLOUD; DUST ATTENUATION; FORMATION HISTORY; LUMINOSITY DENSITY; HIGH-REDSHIFT; STELLAR POPULATIONS; FAR-ULTRAVIOLET; NEARBY GALAXIES; H-ALPHA; EXTINCTION;

D O I：

10.1088/0004-637X/706/1/553

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

Compared to starburst galaxies, normal star-forming galaxies have been shown to display a much larger dispersion of the dust attenuation at fixed reddening through studies of the IRX-beta diagram (the IR/UV ratio "IRX" versus the UV color "beta"). To investigate the causes of this larger dispersion and attempt to isolate second parameters, we have used GALEX UV, ground-based optical, and Spitzer infrared imaging of eight nearby galaxies, and examined the properties of individual UV and 24 mu m selected star-forming regions. We concentrated on star-forming regions, in order to isolate simpler star formation histories than those that characterize whole galaxies. We find that (1) the dispersion is not correlated with the mean age of the stellar populations; (2) a range of dust geometries and dust extinction curves are the most likely causes for the observed dispersion in the IRX-beta diagram, (3) together with some potential dilution of the most recent star-forming population by older unrelated bursts, at least in the case of star-forming regions within galaxies; and (4) we also recover some general characteristics of the regions, including a tight positive correlation between the amount of dust attenuation and the metal content. Although generalizing our results to whole galaxies may not be immediate, the possibility of a range of dust extinction laws and geometries should be accounted for in the latter systems as well.

引用

页码：553 / 570

页数：18

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