标题： 轴对称、三积分的星系模型：NGC 3379中的大质量黑洞 显示英文标题

标题： Axisymmetric, 3-Integral Models of Galaxies: A Massive Black Hole in NGC3379

摘要： 我们利用来自哈勃太空望远镜（HST）/FOS光谱仪获得的星系中心视向速度分布以及沿四个位置角的地基长缝光谱，用轴对称三积分动力学模型拟合NGC 3379。其中，光度分布由WFPC2和地基图像约束，模型倾角从29度（内禀椭圆星系类型E5）到90度（内禀E1），黑洞质量从0到1e9太阳质量。 最佳拟合的黑洞质量范围从6e7到2e8太阳质量，这取决于倾角。 最佳模型的速度椭球体与各向同性或两积分分布函数均不一致。 沿星系主轴方向，速度椭球体在最内层的径向变为切向，在中间范围半径处呈现径向，而在最外层的径向又变为切向。 对于可接受的模型，在中间范围半径内的径向与切向速度弥散比值范围为： 1.1 < σ_r / σ_t < 1.7。 与这些三积分模型相比， 两积分各向同性模型高估了黑洞质量，因为它们无法提供足够的径向运动。 然而，本文所提出的模型仍然存在限制性的假设——即恒定的质量-光度比和球对称性假设——需要更多模型来更全面地研究黑洞属性。 显示英文摘要

摘要： We fit axisymmetric 3-integral dynamical models to NGC3379 using the line-of-sight velocity distribution obtained from HST/FOS spectra of the galaxy center and ground-based long-slit spectroscopy along four position angles, with the light distribution constrained by WFPC2 and ground-based images. We have fitted models with inclinations from 29 (intrinsic galaxy type E5) to 90 degrees (intrinsic E1) and black hole masses from 0 to 1e9 M_solar. The best-fit black hole masses range from 6e7 to 2e8 M_solar, depending on inclination. The velocity ellipsoid of the best model is not consistent with either isotropy or a two-integral distribution function. Along the major axis, the velocity ellipsoid becomes tangential at the innermost bin, radial in the mid-range radii, and tangential again at the outermost bins. For the acceptable models, the radial to tangential dispersion in the mid-range radii ranges from 1.1 < sigma_r / sigma_t < 1.7. Compared with these 3-integral models, 2-integral isotropic models overestimate the black hole mass since they cannot provide adequate radial motion. However, the models presented in this paper still contain restrictive assumptions-namely assumptions of constant M/L and spheroidal symmetry-requiring yet more models to study black hole properties in complete generality.