论文标题
M104（sombrero）组的距离和质量
Distance and mass of the M104 (Sombrero) group
论文作者
论文摘要
发光早期型星系M 104（sombrero）附近星系的距离和径向速度用于得出其暗物质质量。 两个矮星系：UGCA 307和KKSG 30位于M 104附近的KKSG 30，并用高级相机在哈勃太空望远镜上进行调查。使用红色巨型分支方法的提示，确定了$ 9.03^{+0.84} _ { - 0.51} $ MPC（UGCA 307）和$ 9.72^{+0.44} _ { - 0.41} $ MPC（KKSG 30）。这些距离与矮星系是Sombrero的卫星一致。 使用radial速度和UGCA 307，KKSG 30和第三个星系的预计分离具有准确的距离（KKSG 29），以及其他12个具有较差距离较小距离的假定同伴，M 104的总质量估计为$（1.55 \ pm0.49）10^{13} {13} {13} m _}以$ 2.4 10^{11} l _ {\ odot} $的k频段光度为$，其总质量与光度比为$ M_T/L_K =（65 \ pm20）
Distances and radial velocities of galaxies in the vicinity of the luminous early-type galaxy M 104 (Sombrero) are used to derive its dark matter mass. Two dwarf galaxies: UGCA 307 and KKSG 30 situated near M 104 were observed with the Advanced Camera for Surveys on the Hubble Space Telescope. The distances $9.03^{+0.84}_{-0.51}$ Mpc (UGCA 307) and $9.72^{+0.44}_{-0.41}$ Mpc (KKSG 30) were determined using the tip of the red giant branch method. These distances are consistent with the dwarf galaxies being satellites of Sombrero. Using radial velocities and projected separations of UGCA 307, KKSG 30, and a third galaxy with an accurate distance (KKSG 29), as well as 12 other assumed companions with less accurate distances, the total mass of M 104 is estimated to be $(1.55\pm0.49) 10^{13} M_{\odot}$. At the K-band luminosity of the Sombrero galaxy of $2.4 10^{11} L_{\odot}$, its total mass-to-luminosity ratio is $M_T/L_K = (65\pm20)M_{\odot}/L_{\odot}$, which is about three times higher than that of luminous bulgeless galaxies.
