RADIOACTIVELY POWERED EMISSION FROM BLACK HOLE-NEUTRON STAR MERGERS
RADIOACTIVELY POWERED EMISSION FROM BLACK HOLE-NEUTRON STAR MERGERS
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DOI：
10.1088/0004-637x/780/1/31
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发表时间：
2014-01-01
影响因子：
4.9
通讯作者：
Shibata, Masaru
中科院分区：
文献类型：
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作者：
Tanaka, Masaomi;Hotokezaka, Kenta;Shibata, Masaru
探测引力波源的电磁对应物对于揭示致密双星并合的本质具有重要意义。本文对黑洞（BH）-中子星星（NS）合并过程中的放射性能量辐射进行了三维、多频、含时的辐射传输模拟。根据BH与NS的质量比，BH的自旋和致密物质的状态方程，BH-NS合并可以比NS-NS合并喷射更多的物质。在这种情况下，BH-NS合并喷出物的放射性能量发射可能比NS-NS合并更明亮。我们发现，尽管预计较大的距离BH-NS合并事件，观测到的亮度BH-NS合并可以媲美，甚至高于NS-NS合并。我们发现，当潮汐扰动的BH-NS合并喷出物被限制在一个小的立体角，从BH-NS合并喷出物的排放往往是蓝色的比从NS-NS合并喷出物为一个给定的总光度。由于这一性质，我们可能能够区分BH-NS合并事件从NS-NS合并事件的放射性供电发射的多波段观测。除了GW观测，这种电磁观测可以潜在地提供关于GW源的祖先和致密二元聚结的性质的独立信息。
Detection of the electromagnetic counterparts of gravitational wave (GW) sources is important to unveil the nature of compact binary coalescences. We perform three-dimensional, time-dependent, multi-frequency radiative transfer simulations for radioactively powered emission from the ejecta of black hole (BH)-neutron star (NS) mergers. Depending on the BH to NS mass ratio, spin of the BH, and equations of state of dense matter, BH-NS mergers can eject more material than NS-NS mergers. In such cases, radioactively powered emission from the BH-NS merger ejecta can be more luminous than that from NS-NS mergers. We show that, in spite of the expected larger distances to BH-NS merger events, the observed brightness of BH-NS mergers can be comparable to or even higher than that of NS-NS mergers. We find that, when the tidally disrupted BH-NS merger ejecta are confined to a small solid angle, the emission from BH-NS merger ejecta tends to be bluer than that from NS-NS merger ejecta for a given total luminosity. Thanks to this property, we might be able to distinguish BH-NS merger events from NS-NS merger events by multi-band observations of the radioactively powered emission. In addition to the GW observations, such electromagnetic observations can potentially provide independent information on the progenitors of GW sources and the nature of compact binary coalescences.