التفاصيل البيبلوغرافية
| العنوان: |
The Metallicity Dependence of the High-Mass X-ray Binary Luminosity Function |
| المؤلفون: |
Tassos Fragos, Konstantinos Kovlakas, Antara Basu-Zych, Rafael T. Eufrasio, Bret D. Lehmer, Benjamin J. Williams, Kristen Garofali, Keith Doore, A. Zezas, L. Santana-Silva |
| بيانات النشر: |
arXiv, 2020. |
| سنة النشر: |
2020 |
| مصطلحات موضوعية: |
Physics, X-ray astronomy, Spiral galaxy, Cosmology and Nongalactic Astrophysics (astro-ph.CO), 010504 meteorology & atmospheric sciences, Star formation, Astrophysics::High Energy Astrophysical Phenomena, Metallicity, X-ray binary, Binary number, FOS: Physical sciences, Astronomy and Astrophysics, Astrophysics::Cosmology and Extragalactic Astrophysics, Astrophysics, Astrophysics - Astrophysics of Galaxies, 01 natural sciences, Galaxy, Space and Planetary Science, Astrophysics of Galaxies (astro-ph.GA), 0103 physical sciences, 010303 astronomy & astrophysics, Astrophysics::Galaxy Astrophysics, Astrophysics - Cosmology and Nongalactic Astrophysics, 0105 earth and related environmental sciences, Luminosity function (astronomy) |
| الوصف: |
We present detailed constraints on the metallicity dependence of the high mass X-ray binary (HMXB) X-ray luminosity function (XLF). We analyze ~5 Ms of Chandra data for 55 actively star-forming galaxies at D < 30 Mpc with gas-phase metallicities spanning 12 + log(O/H) = 7-9.2. Within the galactic footprints, our sample contains a total of 1311 X-ray point sources, of which ~49% are expected to be HMXBs, with the remaining sources likely to be low-mass X-ray binaries (LMXBs; ~22%) and unrelated background sources (~29%). We construct a model that successfully characterizes the average HMXB XLF over the full metallicity range. We demonstrate that the SFR-normalized HMXB XLF shows clear trends with metallicity, with steadily increasing numbers of luminous and ultraluminous X-ray sources (logL(erg/s) = 38-40.5) with declining metallicity. However, we find that the low-luminosity (logL(erg/s) = 36-38) HMXB XLF appears to show a nearly constant SFR scaling and slope with metallicity. Our model provides a revised scaling relation of integrated LX/SFR versus 12 + log(O/H) and a new characterization of its the SFR-dependent stochastic scatter. The general trend of this relation is broadly consistent with past studies based on integrated galaxy emission; however, our model suggests that this relation is driven primarily by the high-luminosity end of the HMXB XLF. Our results have implications for binary population synthesis models, the nature of super-Eddington accreting objects (e.g., ultraluminous X-ray sources), recent efforts to identify active galactic nucleus candidates in dwarf galaxies, and the X-ray radiation fields in the early Universe during the epoch of cosmic heating at z > 10.
Accepted for publication in ApJ |
| DOI: |
10.48550/arxiv.2011.09476 |
| URL الوصول: |
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::5220de299dafc7b5f557a99c74e30aa9 |
| Rights: |
OPEN |
| رقم الانضمام: |
edsair.doi.dedup.....5220de299dafc7b5f557a99c74e30aa9 |
| قاعدة البيانات: |
OpenAIRE |