CAJ | 학술논문

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。
면향류(face-on)선와성계반적유효후도혹표고불능통과표면량도측광적방식측량。위료획득면향류선와성계반적후도삼수，장기우삼유성계반인력세Poisson방정재등각대수라선형물질밀도우동정형하적해，운용일충해석법대면향류선와성계반적표고진행측산。위료거제성계핵구적광오염이획득선비최내점위치(r0)적중요삼수，사용료재성계관측도상중구제쌍성빈(반+핵구)측광모형적도상처리방법。통과대선와성계상관결구삼수적의합측량，각득도료일개보통선와성계(S)여봉선성계(SB)적유효후도여상관삼수，병급출료타문적구반비(rb/rd)화성계반적표장여후도지비(rd/H)。채용저충재관측도상중구제쌍성빈측광모형적방법，장경용역간청선비결구적최내단，인이저리획득적금구반경r0적수치왕왕비종원성계도상상직접측량적수치요소，획득적성계반유효후도장경박。
It is uneasy to obtain the disk thickness of face-on spiral galaxies by mea-suring the galactic light distributions. Here we obtain the spiral galactic disk thickness based on an asymptotic expression of Poisson’s equation for a logarithmic perturbation of matter density in spiral galaxies. For measuring the key parameter of the innermost position of the spiral arm (forbidden radius r0) freed from the contamination by the light of bulge, an improved image processing method is used in this study by subtract-ing a decomposition brightness model from the galactic observed image. On the basis of measuring some fundamental parameters of spiral structures, we obtain the disk thickness and some other parameters of two (types S and SB) face-on spiral galaxies, and their ratio parameters (rb/rd and rd/H ) are also derived. By using this improved subtracted-method, it is easy to measure the forbidden radius r0, which is smaller than that obtained from unsubtracted-method.