Uncertainties in spiral galaxy projection parameters

被引:44
作者
Barnes, EI [1 ]
Sellwood, JA [1 ]
机构
[1] Rutgers State Univ, Dept Phys & Astron, Piscataway, NJ 08854 USA
关键词
galaxies : fundamental parameters; galaxies : kinematics and dynamics; galaxies : photometry;
D O I
10.1086/346142
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
We investigate the impact of nonaxisymmetric structure on estimates of galaxy inclinations and position angles. A new minimization technique is used to obtain estimates of inclination and position angle from a global fit to either photometric or kinematic data. We discuss possible systematic uncertainties that are much larger than statistical uncertainties. Our investigation reveals that systematic uncertainties associated with fitting photometric data dominate the formal statistical uncertainties. For our sample of inclined galaxies, we estimate that nonaxisymmetric features introduce inclination and position angle uncertainties of approximate to5degrees, on average. The magnitudes of these uncertainties weaken the arguments for intrinsically elliptical galaxy disks.
引用
收藏
页码:1164 / 1176
页数:13
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