The origins of post-starburst galaxies at z < 0.05

被引：57

作者：

Pawlik, M. M. ^{[1
]}

Aldeen, L. Taj ^{[1
,2
]}

Wild, V. ^{[1
]}

Mendez-Abreu, J. ^{[1
,3
,4
]}

Lahen, N. ^{[5
]}

Johansson, P. H. ^{[5
]}

Jimenez, N. ^{[1
,6
]}

Lucas, W. ^{[1
]}

Zheng, Y. ^{[1
]}

Walcher, C. J. ^{[7
]}

Rowlands, K. ^{[1
,8
]}

机构：

[1] Univ St Andrews, Sch Phys & Astron, St Andrews, Fife KY16 9SS, Scotland

[2] Univ Babylon, Coll Sci, Dept Phys, POB 4, Hillah, Babylon, Iraq

[3] Inst Astrofis Canarias, C Via Lactea S-N, E-38205 Tenerife, Spain

[4] Univ La Laguna, Dept Astrofis, Calle Astrofis Francisco Sanchez S-N, Tenerife, Spain

[5] Univ Helsinki, Dept Phys, Gustaf Hallstromin Katu 2a, FI-00014 Helsinki, Finland

[6] Unbound, Unit 18, 44-48 Wharf Rd, London N1 7UX, England

[7] Leibniz Inst Astrophys Potsdam AIP, Sternwarte 16, D-14482 Potsdam, Germany

[8] Johns Hopkins Univ, Dept Phys & Astron, Bloomberg Ctr, 3400 N Charles St, Baltimore, MD 21218 USA

来源：

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY | 2018年 / 477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; 芬兰科学院;

关键词：

galaxies: evolution; galaxies: interactions; galaxies: starburst; galaxies: stellar content; galaxies: structure; DIGITAL SKY SURVEY; STAR-FORMATION HISTORIES; ACTIVE GALACTIC NUCLEI; SMOOTHED PARTICLE HYDRODYNAMICS; STELLAR POPULATION GRADIENTS; DISTANT CLUSTER GALAXIES; BUTCHER-OEMLER CLUSTERS; HUBBLE-SPACE-TELESCOPE; DELTA-STRONG GALAXIES; RED-SEQUENCE;

D O I：

10.1093/mnras/sty589

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

Post-starburst galaxies can be identified via the presence of prominent Hydrogen Balmer absorption lines in their spectra. We present a comprehensive study of the origin of strong Balmer lines in a volume-limited sample of 189 galaxies with 0.01 < z < 0.05, log(M-star/M-circle dot) > 9.5 and projected axial ratio b/a > 0.32. We explore their structural properties, environments, emission lines, and star formation histories, and compare them to control samples of star-forming and quiescent galaxies, and simulated galaxy mergers. Excluding contaminants, in which the strong Balmer lines are most likely caused by dust-star geometry, we find evidence for three different pathways through the post-starburst phase, with most events occurring in intermediate-density environments: (1) a significant disruptive event, such as a gas-rich major merger, causing a starburst and growth of a spheroidal component, followed by quenching of the star formation (70 per cent of post-starburst galaxies at 9.5 < log(M-star/M-circle dot) < 10.5 and 60 per cent at log(M-star/M-circle dot) > 10.5); (2) at 9.5 < log(M-star/M-circle dot) < 10.5, stochastic star formation in blue-sequence galaxies, causing a weak burst and subsequent return to the blue sequence (30 per cent); (3) at log(M-star/M-circle dot) > 10.5, cyclic evolution of quiescent galaxies which gradually move towards the high-mass end of the red sequence through weak starbursts, possibly as a result of a merger with a smaller gas-rich companion (40 per cent). Our analysis suggests that active galactic nuclei (AGNs) are 'on' for 50 per cent of the duration of the post-starburst phase, meaning that traditional samples of post-starburst galaxies with strict emission-line cuts will be at least 50 per cent incomplete due to the exclusion of narrow-line AGNs.

引用

页码：1695 / 1730

页数：36

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