Surface Photometry and Dynamical Properties of Lenticular Galaxies: NGC3245 as Case Study  

作　　者：Mohamed Adel Sharaf K. Mahmoud E. Aly A. A. Alshaery 

机构地区：[1]Astronomy Department, Faculty of Science, King Abdul Aziz University, Jeddah, Saudi Arabia [2]Astronomy, Space Science, Meteorology Department, Faculty of Science, Cairo University, Giza, Egypt [3]Mathematics Department, College of Science for Girls, King Abdul Aziz University, Jeddah, Saudi Arabia [4]Physics Department, National Research Center, Giza, Egypt

出　　处：《International Journal of Astronomy and Astrophysics》2012年第1期39-51,共13页天文学与天体物理学国际期刊（英文）

摘　　要：In this paper, surface photometry and dynamical properties of Lenticular galaxies will be developed and applied to NGC3245. In this respect, we established new relation between the intensity distribution I and the semi-major axis a Moreover, some basic statistics of both independent and the dependent variables of the relation are also given. In addition to the I(a) relation , the Sérsic r1/n model is applied for the intensity profile I(r) resulting in an estimation of the effective radius, re, and the surface brightness it encloses, μe. Both relations (I(a) and I(r)) are accurate as judged by the precision criteria which are: the probable errors for the coefficients , the estimated variance of the fit and the Q value (the square distance between the exact solution and the least square estimated solution) where all very satisfactory. Correlation coefficients between some parameters of the isophotes are also computed. Finally as examples of applications of surface photometry we determined the dynamical properties: mass, density, potential distributions, as well as distributions of escape and circular speeds in terms of Sérsic model.In this paper, surface photometry and dynamical properties of Lenticular galaxies will be developed and applied to NGC3245. In this respect, we established new relation between the intensity distribution I and the semi-major axis a Moreover, some basic statistics of both independent and the dependent variables of the relation are also given. In addition to the I(a) relation , the Sérsic r1/n model is applied for the intensity profile I(r) resulting in an estimation of the effective radius, re, and the surface brightness it encloses, μe. Both relations (I(a) and I(r)) are accurate as judged by the precision criteria which are: the probable errors for the coefficients , the estimated variance of the fit and the Q value (the square distance between the exact solution and the least square estimated solution) where all very satisfactory. Correlation coefficients between some parameters of the isophotes are also computed. Finally as examples of applications of surface photometry we determined the dynamical properties: mass, density, potential distributions, as well as distributions of escape and circular speeds in terms of Sérsic model.

关 键 词：SURFACE PHOTOMETRY DYNAMICAL GALAXIES 

分 类 号：O1[理学—数学]