Lynx-Cancer空隙中的半乳糖苷酶研究。IV。光度控制特性
Study of Galaxies in the Lynx-Cancer Void. IV. Photometric Properties
摘要：
我们提出了一个光度研究的85个对象的更新样本的星系居住在附近的Lynx-癌症空隙的结果。我们对斯隆数字巡天的u、g、r和i波段图像进行测光。我们确定独立于模型的星系参数，如积分星等和颜色，有效半径和相应的表面亮度值，光学半径和Holmberg半径。我们分析了径向表面亮度分布，以确定中心亮度值和规模的模型光盘的长度。我们分析了星系外部的颜色，并将其与使用PEGASE 2软件包计算的模型演化轨迹进行比较。这使我们能够估计从恒星形成开始以来所经过的时间T_SF，对于绝大多数所研究的星系来说，这是宇宙学时间T_0的数量级。但有13个星系的时间T_SF不超过T_0/2 ~ 7 Gyr，其中7个星系的T_SF< 3.5 Gyr. The latter are mostly unevolved objects dominated by low-luminosity galaxies with M_B >为-13.2。我们使用积分星等和颜色来估计星系的恒星质量。我们估计了具有已知HI线通量的空星系的参数M（HI）/L_B和气体质量分数。在M（HI）/L_B > 2.5的最富气体的空星系中，有一小部分（约10%）的气体质量分数达到94- 99%。许多这些星系的外部区域显示出闪烁的蓝色。为了测试各种统计差异之间的空白星系和星系的样本选择使用更一般的标准，我们比较了一些参数的空白星系与类似的数据为样本的195个星系的赤道调查（ES）的基础上的HIPASS盲HI调查的一部分。删节
英文摘要：
We present the results of a photometric study of 85 objects from the updated sample of galaxies residing in the nearby Lynx--Cancer void. We perform our photometry on u, g, r, and i-band images of the Sloan Digital Sky Survey. We determine model-independent galaxy parameters such as the integrated magnitudes and colors, effective radii and the corresponding surface brightness values, optical radii and Holmberg radii. We analyze the radial surface brightness profiles to determine the central brightness values and scale lengths of the model discs. We analyze the colors of the outer parts of the galaxies and compare them with model evolutionary tracks computed using the PEGASE2 software package. This allowed us to estimate the time T_SF elapsed since the onset of star formation, which turned out to be on the order of the cosmological time T_0 for the overwhelming majority of the galaxies studied. However, for 13 galaxies of the sample the time T_SF does not exceed T_0/2 ~ 7 Gyr, and for 7 of them T_SF < 3.5 Gyr. The latter are mostly unevolved objects dominated by low-luminosity galaxies with M_B > -13.2. We use the integrated magnitudes and colors to estimate the stellar masses of the galaxies. We estimate the parameter M(HI)/L_B and the gas mass fractions for void galaxies with known HI-line fluxes. A small subgroup (about 10%) of the gas-richest void galaxies with M(HI)/L_B > 2.5 has gas mass fractions that reach 94-99%. The outer regions of many of these galaxies show atypically blue colors. To test various statistical differences between void galaxies and galaxies from the samples selected using more general criteria, we compare some of the parameters of void galaxies with similar data for the sample of 195 galaxies from the Equatorial Survey (ES) based on a part of the HIPASS blind HI survey. abridged
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