A Globular Cluster Luminosity Function Distance to NGC 4993 Hosting a Binary Neutron Star Merger GW170817/GRB 170817A

被引：14

作者：

Lee, Myung Gyoon ^{[1
]}

Kang, Jisu ^{[1
]}

Im, Myungshin ^{[1
]}

机构：

[1] Seoul Natl Univ, Dept Phys & Astron, Astron Program, Seoul 08826, South Korea

来源：

ASTROPHYSICAL JOURNAL LETTERS | 2018年 / 859卷 / 01期

基金：

新加坡国家研究基金会;

关键词：

galaxies: distances and redshifts; galaxies: elliptical and lenticular; cD; galaxies: individual (NGC 4993); galaxies: star clusters: general; gravitational waves; EARLY-TYPE GALAXIES; FUNDAMENTAL PLANE; ELLIPTIC GALAXIES; CALIBRATION; CATALOG;

D O I：

10.3847/2041-8213/aac2e9

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

NGC 4993 hosts a binary neutron star merger, GW170817/GRB 170817A, emitting gravitational waves and electromagnetic waves. The distance to this galaxy is not well established. We select the globular cluster candidates from the Hubble Space Telescope (HST)/ACS F606W images of NGC 4993 in the archive, using the structural parameters of the detected sources. The radial number density distribution of these candidates shows a significant central concentration around the galaxy center at the galactocentric distance r. < 50", showing that they are mostly the members of NGC 4993. Also, the luminosity function of these candidates is fit well by a Gaussian function. Therefore, the selected candidates at r < 50" are mostly considered to be globular clusters in NGC 4993. We derive an extinction-corrected turnover Vega magnitude in the luminosity function of the globular clusters at 20" < r < 50", F606W (max)(0) =. 25.36 +/- 0.08 (V-0 = 25.52 +/- 0.11) mag. Adopting the calibration of the turnover magnitudes of the globular clusters, M-V(max). = -7.58 +/- 0.11, we derive a distance to NGC 4993, d = 41.65 +/- 3.00 Mpc ((m-M)(0) = 33.10 +/- 0.16). The systematic error of this method can be as large as +/- 0.3 mag. This value is consistent with the previous distance estimates based on the fundamental plane relation and the gravitational wave method in the literature. The distance in this study can be used to constrain the values of the parameters including the inclination angle of the binary system in the models of gravitational wave analysis.

引用

页数：8

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