Gamma-Ray Diagnostics of r-process Nucleosynthesis in the Remnants of Galactic Binary Neutron-star Mergers

被引：7

作者：

Terada, Yukikatsu ^{[1
,2
]}

Miwa, Yuya ^{[1
]}

Ohsumi, Hayato ^{[1
]}

Fujimoto, Shin-ichiro ^{[3
]}

Katsuda, Satoru ^{[1
]}

Bamba, Aya ^{[4
,5
]}

Yamazaki, Ryo ^{[6
,7
]}

机构：

[1] Saitama Univ, Grad Sch Sci & Engn, 255 Sakura Ku, Saitama 3388570, Japan

[2] Japan Aerosp Explorat Agcy, Inst Space & Astronaut Sci, 3 1 1 Yoshinodai,Chuo ku, Sagamihara, Kanagawa 2525210, Japan

[3] Kumamoto Coll, Natl Inst Technol, 2659 2 Suya, Kumamoto 8611102, Japan

[4] Univ Tokyo, Dept Phys, 7 3 1 Hongo,Bunkyo, Tokyo 1130033, Japan

[5] Univ Tokyo, Sch Sci, Res Ctr Early Universe, 7 3 1 Hongo,Bunkyo, Tokyo 1130033, Japan

[6] Aoyama Gakuin Univ, Dept Phys Sci, 5 10 1 Fuchinobe, Sagamihara, Kanagawa 2525258, Japan

[7] Osaka Univ, Inst Laser Engn, 2 6,Yamadaoka, Suita, Osaka 5650871, Japan

来源：

ASTROPHYSICAL JOURNAL | 2022年 / 933卷 / 01期

关键词：

COMPACT OBJECTS; RADIOACTIVE DECAY; METALLICITY; TELESCOPE; PROSPECTS; ELEMENTS; UNIVERSE; EJECTA; MASS;

D O I：

10.3847/1538-4357/ac721f

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We perform a full nuclear-network numerical calculation of the r-process nuclei in binary neutron-star mergers (NSMs), with the aim of estimating gamma-ray emissions from the remnants of Galactic NSMs up to 10(6) yr old. The nucleosynthesis calculation of 4070 nuclei is adopted to provide the elemental composition ratios of nuclei with an electron fraction Y (e) between 0.10 and 0.45. The decay processes of 3237 unstable nuclei are simulated to extract the gamma-ray spectra. As a result, the NSMs have different spectral colors in the gamma-ray band from various other astronomical objects at less than 10(5) yr old. In addition, we propose a new line diagnostic method for Y (e) that uses the line ratios of either Ba-137m/K-85 or Am-243/Co-60m, which become larger than unity for young and old r-process sites, respectively, with a low-Y (e) environment. From an estimation of the distance limit for gamma-ray observations as a function of age, the high sensitivity in the sub-megaelectronvolt band, at approximately 10(-9) photons s(-1) cm(-2) or 10(-15) erg s(-1) cm(-2), is required to cover all the NSM remnants in our Galaxy, if we assume that the population of NSMs by Wu et al. A gamma-ray survey with sensitivities of 10(-8)-10(-7) photons s(-1) cm(-2) or 10(-14)-10(-13) erg s(-1) cm(-2) in the 70-4000 keV band is expected to find emissions from at least one NSM remnant under the assumption of an NSM rate of 30 Myr(-1). The feasibility of gamma-ray missions observing Galactic NSMs is also studied.

引用

页数：13

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