Abstract

We have undertaken a search for satellites around edge-on galaxies in the EGIPS catalog, which contains 16 551 objects with declinations above  \(-30^{\circ}\) . We searched for systems with a central galaxy dominating in brightness by at least \(1^{\textrm{m}}\) compared to its companions. As a result, we discovered 1097 candidate satellites around 764 EGIPS galaxies with projected distances less than 500 kpc and a radial velocity difference less than 300 km s \({}^{-1}\) . Of these, 757 satellites around 547 central galaxies have radial velocity accuracies higher than 20 km s \({}^{-1}\) and satisfy the gravitationally bound condition. The ensemble of satellites is characterized by an average projected distance of 84 kpc and an average radial velocity dispersion of 103 km s \({}^{-1}\) . Treating small satellites as test particles moving on isotropic orbits around central EGIPS galaxies, we determined the projected (orbital) masses of the edge-on galaxies. Within the luminosity range of \(1.3\times 10^{10}\) to \(42\times 10^{10}\)   \(L_{\odot}\) , the total mass of the systems is well described by a linear dependence \(\log M_{p}\propto 0.88\log\left\langle L_{K}\right\rangle_{\textrm{g}}\) with an average total mass-to- \(K\) -band luminosity equal to \((17.5\pm 0.8) M_{\odot}/L_{\odot}\) , which is typical for nearby spiral galaxies such as the Milky Way, M 31 and M 81.

中文翻译：

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边缘星系周围的卫星。I. 动态质量

摘要

我们在 EGIPS 目录中搜索了边缘星系周围的卫星，其中包含 16 551 个偏角高于 \(-30^{\circ}\) 的天体。我们搜索了中央星系的亮度与其伴星相比至少\(1^{\textrm{m}}\)的系统。结果，我们在 764 个 EGIPS 星系周围发现了 1097 颗候选卫星，投影距离小于 500 kpc，径向速度差小于 300 km·s \({}^{-1}\)。其中，围绕547个中心星系的757颗卫星的径向速度精度高于20 km·s \({}^{-1}\)并满足引力束缚条件。该卫星群的平均投射距离为 84 kpc，平均径向速度色散为 103 km·s \({}^{-1}\)。将小卫星视为在中心 EGIPS 星系周围各向同性轨道上移动的测试粒子，我们确定了边缘星系的投影（轨道）质量。在\(1.3\times 10^{10}\)到\(42\times 10^{10}\) \(L_{\odot}\)的光度范围内，系统的总质量可以很好地描述为线性相关性\(\log M_{p}\propto 0.88\log\left\langle L_{K}\right\rangle_{\textrm{g}}\)与平均总质量对\(K\)带光度等于\((17.5\pm 0.8) M_{\odot}/L_{\odot}\)，这对于附近的螺旋星系（例如银河系、M 31 和 M 81）来说是典型的。