Planetary nebulae as mass tracers of their parent galaxies: Biases in the estimate of the kinematical quantities
Planetary nebulae as mass tracers of their parent galaxies: Biases in the estimate of the kinematical quantities
复制标题
行星状星云作为其母星系的质量示踪剂：运动学量估计中的偏差
DOI：
10.1051/0004-6361:20011106
复制
发表时间：
2001
影响因子：
6.5
通讯作者：
Australian National University
中科院分区：
文献类型：
--
作者：
N. Napolitano;M. Arnaboldi;K. Freeman;M. C. O. A. D. Capodimonte;Dipartimento di Scienze Fisiche;U. F. I. Napoli;Rsaa;Mount Stromlo Observatory;Australian National University
Multi-object and multi-fiber spectrographs on 4 and 8 m telescopes make it possible to use extragalactic planetary nebulae (PNe) in the outer halos of early-type galaxies as kinematical tracers, where classical techniques based on integrated stellar light fail. Until now, published PNe radial velocity samples are small, with only a few tens of radial velocity measurements (except for a few cases like NGC 5128 or M 31), causing uncertainties in the mass and angular momentum estimates based on these data. To quantify these uncertainties, we have made equilibrium models for spherical galaxies, with and without dark matter, and via Montecarlo simulations we produce radial velocity samples with different sizes. We then apply, to these discrete radial velocity fields, the same standard kinematical analysis as it is commonly done with small samples of observed PNe radial velocities. By comparison of the inferred quantities with those computed from the analytical model, we test for systematic biases and establish a robust procedure to infer the angular momentum distribution and radial velocity dispersion profiles from such samples.
