Two-point Separation Functions for Modeling Wide Binary Systems in Nearby Dwarf Galaxies

被引：3

作者：

Kervick, Christopher ^{[1
]}

Walker, Matthew G. ^{[1
]}

Penarrubia, Jorge ^{[2
,3
]}

Koposov, Sergey E. ^{[2
,4
]}

机构：

[1] Carnegie Mellon Univ, Dept Phys, McWilliams Ctr Cosmol, 5000 Forbes Ave, Pittsburgh, PA 15213 USA

[2] Univ Edinburgh, Inst Astron, Royal Observ, Blackford Hill, Edinburgh EH9 3HJ, Midlothian, Scotland

[3] Univ Edinburgh, Sch Math, Ctr Stat, Edinburgh EH9 3FD, Midlothian, Scotland

[4] Univ Cambridge, Inst Astron, Madingley Rd, Cambridge CB3 0HA, England

来源：

ASTROPHYSICAL JOURNAL | 2022年 / 929卷 / 01期

基金：

美国国家科学基金会; 美国安德鲁·梅隆基金会;

关键词：

STAR CLUSTER; DARK-MATTER; EVOLUTION; MASS; MULTIPLICITY; EFFICIENT; DISK;

D O I：

10.3847/1538-4357/ac5b5f

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We use a geometric method to derive (two-dimensional) separation functions among pairs of objects within populations of specified position function dN/dR. We present analytic solutions for separation functions corresponding to a uniform surface density within a circular field, a Plummer sphere (viewed in projection), and the mixture thereof-including contributions from binary objects within both subpopulations. These results enable inferences about binary object populations via direct modeling of object position and pair separation data, without resorting to standard estimators of the two-point correlation function. Analyzing mock data sets designed to mimic known dwarf spheroidal galaxies, we demonstrate the ability to recover input properties including the number of wide binary star systems and, in cases where the number of resolved binary pairs is assumed to be greater than or similar to a few hundred, characteristic features (e.g., steepening and/or truncation) of their separation function. Combined with forthcoming observational capabilities, this methodology opens a window onto the formation and/or survival of wide binary populations in dwarf galaxies, and offers a novel probe of inferred dark matter substructure on the smallest galactic scales.

引用

页数：16

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