LESS THAN 10 PERCENT OF STAR FORMATION IN z similar to 0.6 MASSIVE GALAXIES IS TRIGGERED BY MAJOR INTERACTIONS

CORC > 紫金山天文台 > 中国科学院紫金山天文台 > 星系中的恒星形成研究团组

	LESS THAN 10 PERCENT OF STAR FORMATION IN z similar to 0.6 MASSIVE GALAXIES IS TRIGGERED BY MAJOR INTERACTIONS
	Robaina, Aday R.1; Bell, Eric F.1; Skelton, Rosalind E.1; McIntosh, Daniel H.2,3; Somerville, Rachel S.4; Zheng, Xianzhong5 ; Rix, Hans-Walter 1; Bacon, David 6; Balogh, Michael 7; Barazza, Fabio D.8
刊名	ASTROPHYSICAL JOURNAL
	2009-10-10
卷号	704 期号:1 页码:324-340
关键词	galaxies: evolution galaxies: general galaxies: interactions galaxies: starburst galaxies: statistics infrared: galaxies
ISSN号	0004-637X
英文摘要	Both observations and simulations show that major tidal interactions or mergers between gas-rich galaxies can lead to intense bursts of star formation. Yet, the average enhancement in star formation rate (SFR) in major mergers and the contribution of such events to the cosmic SFR are not well estimated. Here we use photometric redshifts, stellar masses, and UV SFRs from COMBO-17, 24 mu m SFRs from Spitzer, and morphologies from two deep Hubble Space Telescope (HST) cosmological survey fields (ECDFS/GEMS and A901/STAGES) to study the enhancement in SFR as a function of projected galaxy separation. We apply two-point projected correlation function techniques, which we augment with morphologically selected very close pairs (separation <2 '') and merger remnants from the HST imaging. Our analysis confirms that the most intensely star-forming systems are indeed interacting or merging. Yet, for massive (M(*) >= 10(10) M(circle dot)) star-forming galaxies at 0.4 < z < 0.8, we find that the SFRs of galaxies undergoing a major interaction (mass ratios <= 1:4 and separations <= 40 kpc) are only 1.80 +/- 0.30 times higher than the SFRs of non-interacting galaxies when averaged over all interactions and all stages of the interaction, in good agreement with other observational works. Our results also agree with hydrodynamical simulations of galaxy interactions, which produce some mergers with large bursts of star formation on similar to 100 Myr timescales, but only a modest SFR enhancement when averaged over the entire merger timescale. We demonstrate that these results imply that only less than or similar to 10% of star formation at 0.4 <= z <= 0.8 is triggered directly by major mergers and interactions; these events are not important factors in the build-up of stellar mass since z = 1.
学科主题	Astronomy & Astrophysics
WOS标题词	Science & Technology ; Physical Sciences
类目[WOS]	Astronomy & Astrophysics
研究领域[WOS]	Astronomy & Astrophysics
关键词[WOS]	ULTRALUMINOUS INFRARED GALAXIES ; SPECTRAL ENERGY-DISTRIBUTIONS ; ACTIVE GALACTIC NUCLEI ; HUBBLE-SPACE-TELESCOPE ; HIGH-REDSHIFT GALAXIES ; DEEP FIELD-SOUTH ; X-RAY-EMISSION ; FORMATION HISTORY ; FORMING GALAXIES ; STELLAR MASS
收录类别	SCI
语种	英语
WOS记录号	WOS:000270219500027
公开日期	2011-12-08
内容类型	期刊论文
源URL	[http://159.226.72.40/handle/332002/1581]
专题	紫金山天文台_星系中的恒星形成研究团组
作者单位	1.Max Planck Inst Astron, D-69117 Heidelberg, Germany 2.Univ Massachusetts, Dept Astron, Amherst, MA 01003 USA 3.Univ Missouri, Dept Phys, Kansas City, MO 64110 USA 4.Space Telescope Sci Inst, Baltimore, MD 21218 USA 5.Chinese Acad Sci, Purple Mt Observ, Nanjing 210008, Peoples R China 6.Univ Portsmouth, Inst Cosmol & Gravitat, Portsmouth PO1 2EG, Hants, England 7.Univ Waterloo, Dept Phys & Astron, Waterloo, ON N2L 3G1, Canada 8.EPFL, Astrophys Lab, CH-1290 Sauverny, Switzerland 9.Univ Innsbruck, Inst Astro & Particle Phys, A-6020 Innsbruck, Austria 10.Astrophys Inst Potsdam, D-14482 Potsdam, Germany
推荐引用方式 GB/T 7714	Robaina, Aday R.,Bell, Eric F.,Skelton, Rosalind E.,et al. LESS THAN 10 PERCENT OF STAR FORMATION IN z similar to 0.6 MASSIVE GALAXIES IS TRIGGERED BY MAJOR INTERACTIONS[J]. ASTROPHYSICAL JOURNAL,2009,704(1):324-340.
APA	Robaina, Aday R..,Bell, Eric F..,Skelton, Rosalind E..,McIntosh, Daniel H..,Somerville, Rachel S..,...&Wolf, Christian.(2009).LESS THAN 10 PERCENT OF STAR FORMATION IN z similar to 0.6 MASSIVE GALAXIES IS TRIGGERED BY MAJOR INTERACTIONS.ASTROPHYSICAL JOURNAL,704(1),324-340.
MLA	Robaina, Aday R.,et al."LESS THAN 10 PERCENT OF STAR FORMATION IN z similar to 0.6 MASSIVE GALAXIES IS TRIGGERED BY MAJOR INTERACTIONS".ASTROPHYSICAL JOURNAL 704.1(2009):324-340.