Arid
DOI10.1111/j.1365-2966.2008.13712.x
The SAURON project - XII. Kinematic substructures in early-type galaxies: evidence for discs in fast rotators
Krajnovic, Davor1; Bacon, R.2,3,4,5,6; Cappellari, Michele1; Davies, Roger L.1; de Zeeuw, P. T.7,8; Emsellem, Eric; Falcon-Barroso, Jesus9; Kuntschner, Harald10; McDermid, Richard M.11; Peletier, Reynier F.12; Sarzi, Marc13; van den Bosch, Remco C. E.8; van de Ven, Glenn14
通讯作者Krajnovic, Davor
来源期刊MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
ISSN0035-8711
EISSN1365-2966
出版年2008
卷号390期号:1页码:93-117
英文摘要

We analysed two-dimensional maps of 48 early-type galaxies obtained with the SAURON and OASIS integral-field spectrographs using kinemetry, a generalization of surface photometry to the higher order moments of the line-of-sight velocity distribution (LOSVD). The maps analysed include: reconstructed image, mean velocity, velocity dispersion, h(3) and h(4) Gauss-Hermite moments. Kinemetry is a good method to recognize structures otherwise missed by using surface photometry, such as embedded discs and kinematic subcomponents. In the SAURON sample, we find that 31 per cent of early-type galaxies are single component systems. 91 per cent of the multicomponents systems have two kinematic subcomponents, the rest having three. In addition, 29 per cent of galaxies have kinematically decoupled components, nuclear components with significant kinematic twists. We differentiate between slow and fast rotators using velocity maps only and find that fast-rotating galaxies contain discs with a large range in mass fractions to the main body. Specifically, we find that the velocity maps of fast rotators closely resemble those of inclined discs, except in the transition regions between kinematic subcomponents. This deviation is measured with the kinemetric k(5)/k(1)ratio, which is large and noisy in slow rotators and about 2 per cent in fast rotators. In terms of E/S0 classification, this means that 74 per cent of Es and 92 per cent of S0s have components with disc-like kinematics. We suggest that differences in k(5)/k(1)values for the fast and slow rotators arise from their different intrinsic structure which is reflected on the velocity maps. For the majority of fast rotators, the kinematic axial ratios are equal to or less than their photometric axial ratios, contrary to what is predicted with isotropic Jeans models viewed at different inclinations. The position angles of fast rotators are constant, while they vary abruptly in slow rotators. Velocity dispersion maps of face-on galaxies have shapes similar to the distribution of light. Velocity dispersion maps of the edge-on fast rotators and all slow rotators show differences which can only be partially explained with isotropic models and, in the case of fast rotators, often require additional cold components. We constructed local (bin-by-bin) h(3)-V/sigma and h(4)-V/sigma diagrams from SAURON observations. We confirm the classical anticorrelation of h(3) and V/sigma, but we also find that h(3) is almost zero in some objects or even weakly correlated with V/sigma. The distribution of h(4) for fast and slow rotators is mildly positive on average. In general, fast rotators contain flattened components characterized by a disc-like rotation. The difference between slow and fast rotators is traceable throughout all moments of the LOSVD, with evidence for different intrinsic shapes and orbital contents and, hence, likely different evolutionary paths.


英文关键词galaxies: elliptical and lenticular, cD galaxies: evolution galaxies: kinematics and dynamics galaxies: structure
类型Article
语种英语
国家England ; France ; Germany ; Netherlands ; USA
收录类别SCI-E
WOS记录号WOS:000260528800029
WOS关键词SIGHT VELOCITY DISTRIBUTIONS ; SPATIALLY-RESOLVED SPECTROSCOPY ; INTEGRAL-FIELD SPECTROGRAPH ; MULTI-GAUSSIAN EXPANSION ; CCD SURFACE PHOTOMETRY ; CLAIMED BLACK-HOLES ; TO-LIGHT RATIO ; ELLIPTIC GALAXIES ; MERGER REMNANTS ; LENTICULAR GALAXIES
WOS类目Astronomy & Astrophysics
WOS研究方向Astronomy & Astrophysics
来源机构University of Oxford ; E17
资源类型期刊论文
条目标识符http://119.78.100.177/qdio/handle/2XILL650/158603
作者单位1.Univ Oxford, Oxford OX1 3RH, England;
2.Univ Lyon, Lyon, France;
3.Univ Lyon 1, F-69007 Lyon, France;
4.Observ Lyon, CRAL, F-69230 St Genis Laval, France;
5.CNRS, UMR 5574, F-75700 Paris, France;
6.ENS Lyon, Lyon, France;
7.European So Observ, D-85748 Garching, Germany;
8.Leiden Univ, NL-2333 CA Leiden, Netherlands;
9.European Space & Technol Ctr, NL-2200 AG Noordwijk, Netherlands;
10.European So Observ, Space Telescope European Coordinating Facil, D-85748 Garching, Germany;
11.No Operat Ctr, Gemini Observ, Hilo, HI 96720 USA;
12.Univ Groningen, Kapteyn Astron Inst, NL-9700 AV Groningen, Netherlands;
13.Univ Hertfordshire, Ctr Astrophys Res, Hatfield AL1 09AB, Herts, England;
14.Inst Adv Study, Princeton, NJ 08544 USA
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GB/T 7714
Krajnovic, Davor,Bacon, R.,Cappellari, Michele,et al. The SAURON project - XII. Kinematic substructures in early-type galaxies: evidence for discs in fast rotators[J]. University of Oxford, E17,2008,390(1):93-117.
APA Krajnovic, Davor.,Bacon, R..,Cappellari, Michele.,Davies, Roger L..,de Zeeuw, P. T..,...&van de Ven, Glenn.(2008).The SAURON project - XII. Kinematic substructures in early-type galaxies: evidence for discs in fast rotators.MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,390(1),93-117.
MLA Krajnovic, Davor,et al."The SAURON project - XII. Kinematic substructures in early-type galaxies: evidence for discs in fast rotators".MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 390.1(2008):93-117.
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