The effect of ram pressure on the star formation, mass distribution and morphology of galaxies

被引:172
作者
Kapferer, W. [1 ]
Sluka, C. [1 ]
Schindler, S. [1 ]
Ferrari, C. [1 ,2 ]
Ziegler, B. [3 ]
机构
[1] Univ Innsbruck, Inst Astro & Teilchenphys, A-6020 Innsbruck, Austria
[2] Observ Cote Azur, Lab Cassiopee, CNRS, UMR 6202, F-06304 Nice 4, France
[3] European So Observ, D-85748 Garching, Germany
基金
奥地利科学基金会;
关键词
galaxies: clusters: general; galaxies: abundances; galaxies: interactions; galaxies: ISM; X-ray: galaxies: clusters; INTRA-CLUSTER MEDIUM; SMOOTHED PARTICLE HYDRODYNAMICS; INTRACLUSTER PLANETARY-NEBULAE; INTERACTING DISC GALAXIES; VIRGO CLUSTER; H-ALPHA; INTERNAL KINEMATICS; METAL ENRICHMENT; VELOCITY-FIELDS; ROTATION CURVES;
D O I
10.1051/0004-6361/200811551
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
Aims. We investigate the dependence of star formation and the distribution of the components of galaxies on the strength of ram pressure. Several mock observations in X-ray, H alpha and HI wavelength for different ram-pressure scenarios are presented. Methods. By applying a combined N-body/hydrodynamic description (GADGET-2) with radiative cooling and a recipe for star formation and stellar feedback 12 different ram-pressure stripping scenarios for disc galaxies were calculated. Special emphasis was put on the gas within the disc and in the surroundings. All gas particles within the computational domain having the same mass resolution. The relative velocity was varied from 100 km s(-1) to 1000 km s(-1) in different surrounding gas densities in the range from 1 x 10(-28) to 5 x 10(-27) g/cm(3). The temperature of the surrounding gas was initially 1 x 10(7) K. Results. The star formation of a galaxy is enhanced by more than a magnitude in the simulation with a high ram-pressure (5 x 10(-11) dyn/cm(2)) in comparison to the same system evolving in isolation. The enhancement of the star formation depends more on the surrounding gas density than on the relative velocity. Up to 95% of all newly formed stars can be found in the wake of the galaxy out to distances of more than 350 kpc behind the stellar disc. Continuously stars fall back to the old stellar disc, building up a bulge-like structure. Young stars can be found throughout the stripped wake with surface densities locally comparable to values in the inner stellar disc. Ram-pressure stripping can shift the location of star formation from the disc into the wake on very short timescales. As the gas in a galaxy has a complex velocity pattern due to the rotation and spiral arms, the superposition of the internal velocity field and the ram pressure causes complex structures in the gaseous wake which survive dynamically up to several 100 Myr. Finally we provide simulated X-ray, H alpha and HI observations to be able to compare our results with observations in these wavebands. These simulated observations show many features which depend strongly both on the strength and the duration of the external ram pressure.
引用
收藏
页码:87 / 102
页数:16
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