面向类旋涡星系盘有效厚度的获取及图像处理方法

发布时间：2018-02-23 02:57

本文关键词： 星系盘星系基本参数星系旋臂星系结构　出处：《天文学报》2014年06期 　论文类型：期刊论文

【摘要】：面向类(face-on)旋涡星系盘的有效厚度或标高不能通过表面亮度测光的方式测量.为了获得面向类旋涡星系盘的厚度参数,将基于三维星系盘引力势Poisson方程在等角对数螺旋型物质密度扰动情形下的解,运用一种解析法对面向类旋涡星系盘的标高进行测算.为了去除星系核球的光污染而获得旋臂最内点位置(r0)的重要参数,使用了在星系观测图像中扣除双成份(盘+核球)测光模型的图像处理方法.通过对旋涡星系相关结构参数的拟合测量,各得到了一个普通旋涡星系(S)与棒旋星系(SB)的有效厚度与相关参数,并给出了它们的球盘比(rb/rd)和星系盘的标长与厚度之比(rd/H).采用这种在观测图像中扣除双成份测光模型的方法,将更容易看清旋臂结构的最内端,因而这里获得的禁区半径r0的数值往往比从原星系图像上直接测量的数值要小,获得的星系盘有效厚度将更薄.
[Abstract]:Class oriented (face-on) spiral galaxies or not through the elevation of the effective thickness of surface brightness photometry measurement. In order to obtain the thickness parameters of class oriented spiral galaxies, galaxies 3D gravitational potential Poisson equation in the density of equiangular logarithm helical type material perturbation case solutions based on the use of an analytical method to calculate the opposite type of spiral galaxies. In order to remove the elevation of light pollution bulge and arm position (R0) in most of the important parameters, using the deduction of double component in the galaxy in observation image (disc nucleus + ball) image processing method of photometric model. By fitting the measurement of spiral structure parameters. Each had an ordinary Spiral Galaxy Galaxy (S) and (SB) the effective thickness and related parameters, and gives the ball disc than their (rb/rd) and the galactic disk scale length to thickness ratio (rd/H) in the. The method of deducing the dual component photometry model in the observed image will make it easier to see the inside end of the spiral arm structure, so the forbidden area radius r0 obtained here is often smaller than that measured directly from the original Galaxy image, and the effective thickness of the galaxy disk will be thinner.

【作者单位】：上海大学自动化系;中国科学院天体结构与演化重点实验室;南京大学天文与空间科学学院;
【基金】：国家自然科学基金项目(U1331103) 中国科学院天体结构与演化重点实验室开放课题(OP201202)资助
【分类号】：P152

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