The High-mass X-Ray Binary Luminosity Functions of Dwarf Galaxies

被引：2

作者：

Geda, Robel ^{[1
]}

Goulding, Andy D. ^{[1
]}

Lehmer, Bret D. ^{[2
]}

Greene, Jenny E. ^{[1
]}

Kulkarni, Anish ^{[3
]}

机构：

[1] Princeton Univ, Dept Astrophys Sci, Princeton, NJ 08540 USA

[2] Univ Arkansas, Dept Phys, 226 Phys Bldg,825 West Dickson St, Fayetteville, AR 72701 USA

[3] Princeton Univ, Dept Phys, Princeton, NJ 08540 USA

来源：

ASTROPHYSICAL JOURNAL | 2024年 / 965卷 / 01期

基金：

美国国家科学基金会; 美国国家航空航天局;

关键词：

STAR-FORMATION RATE; CHANDRA MULTIWAVELENGTH PROJECT; BLACK-HOLES; METALLICITY DEPENDENCE; FORMATION HISTORIES; STELLAR MASS; FORMING GALAXIES; EMISSION; EVOLUTION; LEGUS;

D O I：

10.3847/1538-4357/ad2fc0

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

Drawing from the Chandra archive and using a carefully selected set of nearby dwarf galaxies, we present a calibrated high-mass X-ray binary (HMXB) luminosity function in the low-mass galaxy regime and search for an already hinted at dependence on metallicity. Our study introduces a new sample of local dwarf galaxies (D < 12.5 Mpc and M-* < 5 <bold>x</bold> 10(9)M(circle dot)), expanding the specific star formation rates (sSFR) and gas-phase metallicities probed in previous investigations. Our analysis of the observed X-ray luminosity function indicates a shallower power-law slope for the dwarf galaxy HMXB population. In our study, we focus on dwarf galaxies that are more representative in terms of sSFR compared to prior work. In this regime, the HMXB luminosity function exhibits significant stochastic sampling at high luminosities. This likely accounts for the pronounced scatter observed in the galaxy-integrated HMXB population's L-X/SFR versus metallicity for our galaxy sample. Our calibration is necessary to understand the active galactic nuclei content of low-mass galaxies identified in current and future X-ray survey fields and has implications for binary population synthesis models, as well as X-ray-driven cosmic heating in the early Universe.

引用

页数：15

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