The effects of binary interactions on parameter determinations for early-type galaxies

	The effects of binary interactions on parameter determinations for early-type galaxies
	Zhang, Yu1 ; Liu, Jinzhong1 ; Zhang, Fenghui 2
刊名	MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
	2015-05-21
卷号	449 期号:3 页码:3301-3311
关键词	binaries: general galaxies: fundamental parameters galaxies: stellar content
英文摘要	Based on stellar population models without (SSP) and with (BSP) binary interactions, we investigate the effects of binary interactions on parameter determinations for early-type galaxies (ETGs). We present photometric redshift (photo-z), age and spectral type for photometric data sample by fitting observed magnitudes with the SSP and BSP models. Our results show that binary interactions have no effect on photo-z estimation. Once we neglect binary interactions, the age of ETGs will be underestimated, by contrast, the effects on the age estimations can be negligible for other type of galaxies. For ETG sample, we derive their properties by fitting their spectra with the SSP and BSP models. When comparing these galaxy properties, we find no variation of the overall metallicities for ETGs among the SSP and BSP models. Moreover, the inclusion of binary interactions can affect age estimations. Our results show that the BSP-fitted ages in similar to 33.3 per cent of ETG sample are around 0.5-1.0 Gyr larger than the SSP-fitted ages; similar to 44.2 per cent are only 0.1 - 0.5 Gyr larger; the rest similar to 22.5 per cent are approximately equal. By comparisons, we find the difference of the star formation rate between the SSP and BSP models is large at the late evolution stage.
WOS标题词	Science & Technology ; Physical Sciences
类目[WOS]	Astronomy & Astrophysics
研究领域[WOS]	Astronomy & Astrophysics
关键词[WOS]	DIGITAL SKY SURVEY ; STELLAR POPULATION SYNTHESIS ; HIGH-REDSHIFT GALAXIES ; STAR-FORMING GALAXIES ; INITIAL MASS FUNCTION ; SUBDWARF-B-STARS ; ELLIPTIC GALAXIES ; EVOLUTIONARY SYNTHESIS ; ULTRAVIOLET-RADIATION ; FORMATION HISTORY
收录类别	SCI
语种	英语
WOS记录号	WOS:000355337800084
内容类型	期刊论文
源URL	[http://ir.xao.ac.cn/handle/45760611-7/864]
专题	新疆天文台_光学天文与技术应用研究室
作者单位	1.Chinese Acad Sci, Xinjiang Astron Observ, Urumqi 830011, Peoples R China 2.Chinese Acad Sci, Yunnan Observ, Kunming 650011, Peoples R China
推荐引用方式 GB/T 7714	Zhang, Yu,Liu, Jinzhong,Zhang, Fenghui. The effects of binary interactions on parameter determinations for early-type galaxies[J]. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,2015,449(3):3301-3311.
APA	Zhang, Yu,Liu, Jinzhong,&Zhang, Fenghui.(2015).The effects of binary interactions on parameter determinations for early-type galaxies.MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,449(3),3301-3311.
MLA	Zhang, Yu,et al."The effects of binary interactions on parameter determinations for early-type galaxies".MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 449.3(2015):3301-3311.