| Title | Radiative feedback on supermassive star formation: the massive end of the Population III initial mass function |
| Authors | Toyouchi, Daisuke Inayoshi, Kohei Li, Wenxiu Haiman, Zoltan Kuiper, Rolf |
| Affiliation | Univ Tokyo, Res Ctr Early Universe RESCEU, 7-3-1 Hongo,Bunkyo ku, Tokyo 1130033, Japan Peking Univ, Kavli Inst Astron & Astrophys, Beijing 100871, Peoples R China Columbia Univ, Dept Astron, New York, NY 10027 USA Univ Duisburg Essen, Fac Phys, Lotharstr 1, D-47057 Duisburg, Germany |
| Keywords | BLACK-HOLE FORMATION DARK-MATTER HALOES NEAR-INFRARED SPECTROSCOPY HIGH-Z EXPLORATION 1ST STARS PRIMORDIAL STAR VIRIAL TEMPERATURES DISC FRAGMENTATION LUMINOUS QUASARS LOW-METALLICITY |
| Issue Date | 22-Nov-2022 |
| Publisher | MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY |
| Abstract | Supermassive stars with masses of M-* similar or equal to 10(4)-10(5) M-circle dot, are invoked as possible seeds of high-redshift supermassive black holes, but it remains under debate whether their protostar indeed acquires sufficient mass via gas accretion overcoming radiative feedback. We investigate protostellar growth in dynamically heated atomic cooling haloes (ACHs) found in recent cosmological simulations, performing three-dimensional radiation hydrodynamical simulations that consider stellar evolution under variable mass accretion. We find that one of the ACHs feeds the central protostar at rates exceeding a critical value, above which the star evolves in a cool bloating phase and hardly produces ionizing photons. Consequently, the stellar mass reaches M-* greater than or similar to 10(4) M-circle dot unimpeded by radiative feedback. In the other ACH, where the mass supply rate is lower, the star evolves almost as a hot main-sequence star, emitting intense ionizing radiation. Then, the stellar mass growth is terminated around 500 M-circle dot by photoevaporation of the circumstellar disc. Our simulations provide a formula of the final stellar mass determined either by stellar feedback or their lifetime as a function of the mass supply rate from the parent cloud. Combining the results with the statistical properties of star-forming clouds in high-redshift quasar progenitor haloes, we construct a top-heavy mass distribution of primordial stars over M-* similar or equal to 100-10(5) M-circle dot, approximately following a power-law spectrum of proportional to M-*(-1.3). Their black hole remnants would be further fed via the dense debris disc, powering 'milliquasars' with a bolometric luminosity of L-bol greater than or similar to 10(43) erg s(-1). |
| URI | http://hdl.handle.net/20.500.11897/661792 |
| ISSN | 0035-8711 |
| DOI | 10.1093/mnras/stac3191 |
| Indexed | SCI(E) |
| Appears in Collections: | 科维理天文与天体物理研究所 |
