KINEMATIC PROPERTIES OF DOUBLE-BARRED GALAXIES: SIMULATIONS VERSUS INTEGRAL-FIELD OBSERVATIONS

doi:10.3847/0004-637X/828/1/14

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	KINEMATIC PROPERTIES OF DOUBLE-BARRED GALAXIES: SIMULATIONS VERSUS INTEGRAL-FIELD OBSERVATIONS
	Du, Min 1; Debattista, Victor P.2; Shen, Juntai 1; Cappellari, Michele 3
刊名	ASTROPHYSICAL JOURNAL
	2016-09-01
卷号	828 期号:1
关键词	Galaxies: Individual (Ngc 2859, Ngc 2950, Ngc 3941, Ngc 3384) Galaxies: Kinematics And Dynamics Galaxies: Structure
ISSN号	0004-637X
DOI	10.3847/0004-637X/828/1/14
英文摘要	Using high-resolution N-body simulations, we recently reported that a dynamically cool inner disk embedded in a hotter outer disk can naturally generate a steady double-barred (S2B) structure. Here we study the kinematics of these S2B simulations, and compare them to integral-field observations from ATLAS 3D. and SAURON. We show that S2B galaxies exhibit several distinct kinematic features, namely: (1) significantly distorted isovelocity contours at the transition region between the two bars, (2) peaks in sigma(LOS) along the minor axis of inner bars, which we term "sigma-humps," that are often accompanied by ring/spiral-like features of increased sigma(LOS), (3) h(3)-(nu) over bar anticorrelations in the region of the inner bar for certain orientations, and (4) rings of positive h(4) when viewed at low inclinations. The most impressive of these features are the sigma-humps; these evolve with the inner bar, oscillating in strength just as the inner bar does as it rotates relative to the outer bar. We show that, in cylindrical coordinates, the inner bar has similar streaming motions and velocity dispersion properties as normal large-scale bars, except for sigma(z), which exhibits peaks on the minor axis, i.e., humps. These sigma(z) humps are responsible for producing the sigma-humps. For three well-resolved early-type S2Bs (NGC 2859, NGC 2950, and NGC 3941) and a potential S2B candidate (NGC 3384), the S2B model qualitatively matches the integral-field data well, including the "sigma-hollows" previously identified. We also discuss the kinematic effect of a nuclear disk in S2Bs.
WOS研究方向	Astronomy & Astrophysics
语种	英语
出版者	IOP PUBLISHING LTD
WOS记录号	WOS:000386894900014
内容类型	期刊论文
源URL	[http://119.78.226.72/handle/331011/32715]
专题	中国科学院上海天文台
通讯作者	Debattista, Victor P.
作者单位	1.Chinese Acad Sci, Shanghai Astron Observ, Key Lab Res Galaxies & Cosmol, 80 Nandan Rd, Shanghai 200030, Peoples R China 2.Univ Cent Lancashire, Jeremiah Horrocks Inst, Preston PR1 2HE, Lancs, England 3.Univ Oxford, Dept Phys, Subdept Astrophys, Denys Wilkinson Bldg,Keble Rd, Oxford OX1 3RH, England
推荐引用方式 GB/T 7714	Du, Min,Debattista, Victor P.,Shen, Juntai,et al. KINEMATIC PROPERTIES OF DOUBLE-BARRED GALAXIES: SIMULATIONS VERSUS INTEGRAL-FIELD OBSERVATIONS[J]. ASTROPHYSICAL JOURNAL,2016,828(1).
APA	Du, Min,Debattista, Victor P.,Shen, Juntai,&Cappellari, Michele.(2016).KINEMATIC PROPERTIES OF DOUBLE-BARRED GALAXIES: SIMULATIONS VERSUS INTEGRAL-FIELD OBSERVATIONS.ASTROPHYSICAL JOURNAL,828(1).
MLA	Du, Min,et al."KINEMATIC PROPERTIES OF DOUBLE-BARRED GALAXIES: SIMULATIONS VERSUS INTEGRAL-FIELD OBSERVATIONS".ASTROPHYSICAL JOURNAL 828.1(2016).