The Electromagnetic Counterpart of the Binary Neutron Star Merger LIGO/Virgo GW170817. VIII. A Comparison to Cosmological Short-duration Gamma-Ray Bursts
The Electromagnetic Counterpart of the Binary Neutron Star Merger LIGO/Virgo GW170817. VIII. A Comparison to Cosmological Short-duration Gamma-Ray Bursts
复制标题
DOI：
10.3847/2041-8213/aa9018
复制
发表时间：
2017-10
期刊：
影响因子：
--
通讯作者：
W. Fong;E. Berger;P. Blanchard;R. Margutti;P. Cowperthwaite;R. Chornock;K. Alexander;B. Metzger;V. Villar;M. Nicholl;T. Eftekhari;P. G. Williams;J. Annis;D. Brout;D. Brown;H.-Y. Chen;Zoheyr Doctor;H. Diehl;D. Holz;A. Rest;M. Sako;M. Soares-Santos
中科院分区：
文献类型：
--
作者：
W. Fong;E. Berger;P. Blanchard;R. Margutti;P. Cowperthwaite;R. Chornock;K. Alexander;B. Metzger;V. Villar;M. Nicholl;T. Eftekhari;P. G. Williams;J. Annis;D. Brout;D. Brown;H.-Y. Chen;Zoheyr Doctor;H. Diehl;D. Holz;A. Rest;M. Sako;M. Soares-Santos
我们对 GW170817 的 X 射线对应物的射电特性与短时伽马射线暴 (GRB) 的特性进行了全面比较。为此，我们利用了 2004 年至 2017 年发现的 36 个短伽玛暴样本，其红移范围为 z ≈ 0.12 – 2.6。我们发现，GW170817 的对应物的各向同性等效光度比轴上短 GRB X 射线余辉的中值小约 3000 倍，比检测到的短 GRB 射电余辉小 ≳104 倍。此外，从 GW170817 的射电和 X 射线对应物以及轴上短 GRB 余辉推断出的允许射流能量和粒子密度非常相似，这表明视角效应是其观察到的射电和 X 射线行为的主要差异，也许是唯一的差异。通过与之前声称的短伽玛暴后的千新星进行比较，我们发现与 GW170817 相对应的光学和近红外 (NIR) 亮度相对较低，约为 3 – 5 倍，表明了千新星光度和时间尺度的范围。对≲ 1天时间尺度上的短GRB之后的光学极限进行比较，也排除了先前一个短GRB中具有可比光学各向同性等效光度的“蓝色”千新星。最后，我们在短 GRB 宿主星系星族特性的背景下研究了 GW170817，NGC 4993 的宿主星系。我们发现，与之前的短GRB宿主相比，NGC 4993在其大光度、古老的恒星族年龄和低恒星形成率方面是最出色的。先进激光干涉仪引力波天文台（LIGO）/处女座体积内的其他事件对于描绘中子星-中子星（NS-NS）合并的宿主星系的特性并将它们与宇宙学对应物联系起来至关重要。
We present a comprehensive comparison of the properties of the radio through X-ray counterpart of GW170817 and the properties of short-duration gamma-ray bursts (GRBs). For this effort, we utilize a sample of 36 short GRBs spanning a redshift range of z ≈ 0.12 – 2.6 discovered over 2004–2017. We find that the counterpart to GW170817 has an isotropic-equivalent luminosity that is ≈ 3000 times less than the median value of on-axis short GRB X-ray afterglows, and ≳104 times less than that for detected short GRB radio afterglows. Moreover, the allowed jet energies and particle densities inferred from the radio and X-ray counterparts to GW170817 and on-axis short GRB afterglows are remarkably similar, suggesting that viewing angle effects are the dominant, and perhaps only, difference in their observed radio and X-ray behavior. From comparison to previous claimed kilonovae following short GRBs, we find that the optical and near-infrared (NIR) counterpart to GW170817 is comparatively under-luminous by a factor of ≈ 3 – 5 , indicating a range of kilonova luminosities and timescales. A comparison of the optical limits following short GRBs on ≲ 1 day timescales also rules out a “blue” kilonova of comparable optical isotropic-equivalent luminosity in one previous short GRB. Finally, we investigate the host galaxy of GW170817, NGC 4993, in the context of short GRB host galaxy stellar population properties. We find that NGC 4993 is superlative in terms of its large luminosity, old stellar population age, and low star formation rate compared to previous short GRB hosts. Additional events within the Advanced Laser Interferometer Gravitational-wave Observatory (LIGO)/Virgo volume will be crucial in delineating the properties of the host galaxies of neutron star–neutron star (NS–NS) mergers, and connecting them to their cosmological counterparts.