HYDRODYNAMICAL SIMULATIONS OF NUCLEAR RINGS IN BARRED GALAXIES

	HYDRODYNAMICAL SIMULATIONS OF NUCLEAR RINGS IN BARRED GALAXIES
	Li, Zhi 1; Shen, Juntai1 ; Kim, Woong-Tae 2
刊名	ASTROPHYSICAL JOURNAL
	2015-06-20
卷号	806 期号:2 页码:1
关键词	galaxies: ISM galaxies: kinematics and dynamics galaxies: nuclei hydrodynamics
英文摘要	Dust lanes, nuclear rings, and nuclear spirals are typical gas structures in the inner region of barred galaxies. Their shapes and properties are linked to the physical parameters of the host galaxy. We use high-resolution hydrodynamical simulations to study 2D gas flows in simple barred galaxy models. The nuclear rings formed in our simulations can be divided into two groups: one group is nearly round and the other is highly elongated. We find that roundish rings may not form when the bar pattern speed is too high or the bulge central density is too low. We also study the periodic orbits in our galaxy models, and find that the concept of inner Lindblad resonance (ILR) may be generalized by the extent of x(2) orbits. All roundish nuclear rings in our simulations settle in the range of x(2) orbits (or ILRs). However, knowing the resonances is insufficient to pin down the exact location of these nuclear rings. We suggest that the backbone of round nuclear rings is the x(2) orbital family, i.e., round nuclear rings are allowed only in the radial range of x(2) orbits. A round nuclear ring forms exactly at the radius where the residual angular momentum of infalling gas balances the centrifugal force, which can be described by a parameter f(ring) measured from the rotation curve. The gravitational torque on gas in high pattern speed models is larger, leading to a smaller ring size than in the low pattern speed models. Our result may have important implications for using nuclear rings to measure the parameters of real barred galaxies with 2D gas kinematics.
WOS标题词	Science & Technology ; Physical Sciences
类目[WOS]	Astronomy & Astrophysics
研究领域[WOS]	Astronomy & Astrophysics
关键词[WOS]	ACTIVE GALACTIC NUCLEI ; STAR-FORMATION ; SPIRAL GALAXIES ; DISK GALAXIES ; GAS-FLOW ; WIGGLE INSTABILITY ; CIRCUMNUCLEAR DUST ; INACTIVE GALAXIES ; SPH SIMULATIONS ; CENTRAL REGIONS
收录类别	SCI
语种	英语
WOS记录号	WOS:000357129500005
内容类型	期刊论文
源URL	[http://119.78.226.72/handle/331011/28205]
专题	上海天文台_星系宇宙学重点实验室
作者单位	1.Chinese Acad Sci, Shanghai Astron Observ, Key Lab Res Galaxies & Cosmol, Shanghai 200030, Peoples R China 2.Seoul Natl Univ, Dept Phys & Astron, Astron Program, CEOU, Seoul 151742, South Korea
推荐引用方式 GB/T 7714	Li, Zhi,Shen, Juntai,Kim, Woong-Tae. HYDRODYNAMICAL SIMULATIONS OF NUCLEAR RINGS IN BARRED GALAXIES[J]. ASTROPHYSICAL JOURNAL,2015,806(2):1.
APA	Li, Zhi,Shen, Juntai,&Kim, Woong-Tae.(2015).HYDRODYNAMICAL SIMULATIONS OF NUCLEAR RINGS IN BARRED GALAXIES.ASTROPHYSICAL JOURNAL,806(2),1.
MLA	Li, Zhi,et al."HYDRODYNAMICAL SIMULATIONS OF NUCLEAR RINGS IN BARRED GALAXIES".ASTROPHYSICAL JOURNAL 806.2(2015):1.