The Star Formation Reference Survey - II. Activity demographics and host-galaxy properties for infrared-selected galaxies

被引：9

作者：

Maragkoudakis, A. ^{[1
,2
,3
]}

Zezas, A. ^{[1
,2
,3
]}

Ashby, M. L. N. ^{[2
]}

Willner, S. P. ^{[2
]}

机构：

[1] Univ Crete, Dept Phys, Iraklion 71003, Greece

[2] Harvard Smithsonian Ctr Astrophys, Cambridge, MA 02138 USA

[3] Fdn Res & Technol Hellas FORTH, Iraklion 71003, Greece

来源：

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY | 2018年 / 475卷 / 02期

基金：

美国国家航空航天局; 美国国家科学基金会; 欧洲研究理事会;

关键词：

galaxies: abundances; galaxies: nuclei; galaxies: Seyfert; galaxies: starburst; galaxies: star formation; SUPERMASSIVE BLACK-HOLES; DWARF SEYFERT NUCLEI; DIGITAL SKY SURVEY; GALACTIC NUCLEI; NEARBY GALAXIES; SPECTRAL CLASSIFICATION; LUMINOSITY FUNCTION; STARBURST GALAXIES; HIGH-REDSHIFT; HII-REGIONS;

D O I：

10.1093/mnras/stx3247

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We present activity demographics and host-galaxy properties of infrared-selected galaxies in the local Universe, using the representative Star Formation Reference Survey (SFRS). Our classification scheme is based on a combination of optical emission-line diagrams (BPT) and infrared (IR)-colour diagnostics. Using the weights assigned to the SFRS galaxies based on its parent sample, a far-IR-selected sample comprises 71 per cent H-II galaxies, 13 per cent Seyferts, 3 per cent transition objects (TOs), and 13 per cent low-ionization nuclear emissionline regions (LINERs). For the SFRS HII galaxies, we derive nuclear star formation rates and gas-phase metallicities. We measure host-galaxy metallicities for all galaxies with available long-slit spectroscopy and abundance gradients for a subset of 12 face-on galaxies. The majority of HII galaxies show a narrow range of metallicities, close to solar, and flat metallicity profiles. Based on their host-galaxy and nuclear properties, the dominant ionizing source in the far-infrared selected TOs is star-forming activity. LINERs are found mostly in massive hosts (median of 10(10.5) M-circle dot), median L(60 mu m) = 10(9) L-circle dot, median dust temperatures of F60/F100 = 0.36, and median L-H alpha surface density of 10(40.2) erg s(-1)kpc(-2), indicating older stellar populations as their main ionizing source rather than active galactic nucleus activity.

引用

页码：1485 / 1507

页数：23

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