Academic Journal
Elevated hot gas and high-mass X-ray binary emission in low-metallicity galaxies: implications for nebular ionization and intergalactic medium heating in the early universe
| العنوان: | Elevated hot gas and high-mass X-ray binary emission in low-metallicity galaxies: implications for nebular ionization and intergalactic medium heating in the early universe |
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| المؤلفون: | Bret D. Lehmer, Rafael T. Eufrasio, Antara Basu-Zych, Kristen Garofali, Woodrow Gilbertson, Andrei Mesinger, Mihoko Yukita |
| المساهمون: | Lehmer, Bret D., Eufrasio, Rafael T., Basu-Zych, Antara, Garofali, Kristen, Gilbertson, Woodrow, Mesinger, ANDREI ALBERT, Yukita, Mihoko |
| سنة النشر: | 2022 |
| المجموعة: | Scuola Normale Superiore: CINECA IRIS |
| مصطلحات موضوعية: | High mass x-ray binary star, Metallicity, Star formation, Starburst galaxie, X-ray binary star, X-ray astronomy, Compact objects, Settore FIS/05 - Astronomia e Astrofisica |
| الوصف: | High-energy emission associated with star formation has been proposed as a significant source of interstellar medium (ISM) ionization in low-metallicity starbursts and an important contributor to the heating of the intergalactic medium (IGM) in the high-redshift (z 8) universe. Using Chandra observations of a sample of 30 galaxies at D ≈ 200–450 Mpc that have high specific star formation rates of 3–9 Gyr−1 and metallicities near Z ≈ 0.3Ze, we provide new measurements of the average 0.5–8 keV spectral shape and normalization per unit star formation rate (SFR). We model the sample-combined X-ray spectrum as a combination of hot gas and high-mass X-ray binary (HMXB) populations and constrain their relative contributions. We derive scaling relations of Llog 0.5 8 keV HMXB – /SFR = 40.19 ± 0.06 and Llog 0.5 2 keV gas – /SFR 39.58 ;0.28 0.17 = - + significantly elevated compared to local relations. The HMXB scaling is also somewhat higher than L0.5 8 keV HMXB – –SFR-Z relations presented in the literature, potentially due to our galaxies having relatively low HMXB obscuration and young and X-ray luminous stellar populations. The elevation of the hot gas scaling relation is at the level expected for diminished attenuation due to a reduction of metals; however, we cannot conclude that an L0.5 2 keV gas – –SFR-Z relation is driven solely by changes in ISM metal content. Finally, we present SFR-scaled spectral models (both emergent and intrinsic) that span the X-ray-to-IR band, providing new benchmarks for studies of the impact of ISM ionization and IGM heating in the early universe. |
| نوع الوثيقة: | article in journal/newspaper |
| اللغة: | English |
| Relation: | info:eu-repo/semantics/altIdentifier/wos/WOS:000794029700001; volume:930; issue:2; firstpage:135; numberofpages:20; journal:THE ASTROPHYSICAL JOURNAL; https://hdl.handle.net/11384/125688; info:eu-repo/semantics/altIdentifier/scopus/2-s2.0-85131306997 |
| DOI: | 10.3847/1538-4357/ac63a7 |
| الاتاحة: | https://hdl.handle.net/11384/125688 https://doi.org/10.3847/1538-4357/ac63a7 |
| Rights: | info:eu-repo/semantics/openAccess |
| رقم الانضمام: | edsbas.E1129EF6 |
| قاعدة البيانات: | BASE |
| DOI: | 10.3847/1538-4357/ac63a7 |
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