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2026 年 7 月 9 日 星期四 · 数据截至 arXiv / ADS 最新收录日

本页经 2 次补录 · ·

I.

今日头条

No Breaking · 无突发
今日无通过复核的重大进展

当日 5 篇核心与相关文献均为常规推进,核心 3 篇已按优先级列于下方。

II.

核心文献

3 篇
01
优先级 90 · 伽马暴 GRB · 短暴 · 宿主星系 · 高红移 · JWST

Revealing the High-redshift Host Galaxy of the Short GRB 061201 with JWST

利用 JWST 揭示短 GRB 061201 的高红移宿主星系

Yuhan Mao, Hanrui He, Jia Ren et al.

原文摘要Abstract

Using deep near-infrared and optical JWST and Hubble Space Telescope imaging, we identify a new host-galaxy candidate for the short GRB 061201 at an angular offset of ∼2″ from the optical afterglow, with a best-fit photometric redshift of z ∼ 1.2. We compare it with the prior putative host candidate at z = 0.111. The new candidate has a chance-coincidence probability of P<SUB>cc</SUB> = 0.18, above the classical 0.1 threshold but consistent with a physical association given the depth of the JWST imaging. In contrast, the lower P<SUB>cc</SUB> = 0.11 of the z = 0.111 galaxy is driven primarily by bright-tail statistics. A high-redshift origin is favored by three lines of evidence. First, although both scenarios satisfy the Amati (E<SUB>p,i</SUB>─E<SUB>iso</SUB>) relation, the beaming-corrected energy at z = 0.111 makes GRB 061201 an outlier in the Ghirlanda (E<SUB>p,i</SUB>─E<SUB>γ</SUB>) relation. Second, near-infrared data disfavor an AT2017gfo-like kilonova at z = 0.111. Third, afterglow modeling favors the high-redshift scenario, with the Akaike information criterion (AIC) for the z = 1.2 model lower than that for z = 0.111 by ∆AIC = 16.35. Adopting the z ∼ 1.2 candidate as the host gives a physical offset of 16.4─16.9 kpc (substantially reduced from ∼42 kpc implied under the low-redshift scenario) and a stellar age of ∼2 Gyr, consistent with the general population of short gamma-ray bursts (sGRBs). Furthermore, a low-redshift origin implies a binary neutron-star merger rate of ∼1400 Gpc<SUP>−3</SUP> yr<SUP>−1</SUP>, in tension with gravitational-wave constraints. We conclude that a moderately high-redshift host provides a more self-consistent physical framework for GRB 061201, demonstrating the capability of deep JWST imaging for historically hostless sGRBs.

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亮点

将历史上无宿主短暴 GRB 061201 的宿主候选体从 z=0.111 修正为 z∼1.2;综合 Amati/Ghirlanda 关系、千新星约束、余辉建模 AIC 及并合率,证明深场 JWST 能解决模糊宿主问题。

脉络与展望

以往对短伽马暴的宿主证认常受限于地面或 HST 深度,许多事件因候选体概率不足而被称为无宿主暴。本文对 GRB 061201 利用 JWST 深红外/光学成像,将候选宿主从低红移亮星系修正为 z∼1.2 的暗弱星系,说明深场数据可改变宿主判定。综合高能关系、千新星与余辉模型等独立证据,表明单一概率阈值不足以确定宿主,需要物理一致性检验。未来随着 JWST 对更多历史无宿主短暴的观测,可能系统更新其红移分布、年龄与并合率统计,从而更好连接短暴与双中子星并合及引力波事件。

接收 2026-07-09 · 刊出 2026-08-03 · 收录 2026-08-20

02
优先级 90 · 伽马暴 GRB · 高能暂现天体 · 任务方法

EP241113a: dissipative photospheric emission from a dirty fireball

EP241113a:来自脏火球的耗散光球辐射

Cui-Yuan Dai (School of Astronomy and Space Science, Nanjing University), Xiang-Yu Wang (School of Astronomy and Space Science, Nanjing University), Bing Zhang (Department of Physics, University of Hong Kong; Nevada Center for Astrophysics and Department of Physics and Astronomy, University of Nevada, Las Vegas)

原文摘要Abstract

EP241113a, a soft X-ray transient detected by the Einstein Probe (EP), has an isotropic-equivalent energy ($E_{γ,\rm{iso}}\sim 10^{51}{\, \rm erg}$) comparable to classical gamma-ray bursts (GRBs) but an exceptionally low peak energy ($E_{\rm{p}} \lesssim 1 \, {\rm keV}$), placing it off the canonical $E_{\rm{p}}$--$E_{γ,\rm{iso}}$ (Amati) relation at $>3σ$ confidence. The afterglow of EP241113a is also unusual, with an extremely low plateau luminosity and no jet break up to the latest observation. Such properties have been interpreted as arising from an energetic ``dirty fireball,'' i.e., a relativistic jet with energy comparable to classical GRBs but much higher baryon loading, leading to a bulk Lorentz factor of $Γ\sim 20$. In this {\it Letter}, we propose that low $E_{\rm{p}}$ arises from dissipative photospheric emission in such a low-$Γ$ jet. As $Γ$ decreases, the photosphere shifts outward while the internal shock radius moves inward, causing dissipation to occur well below the photosphere and making the prompt emission photosphere-dominated. Meanwhile, the thermalization radius also moves outward, reducing the comoving radiation temperature where the spectral peak is established. Combined with weaker Lorentz boosting, these effects naturally shift the observed $E_{\rm{p}}$ into the soft X-ray band. We further suggest that such a low-$Γ$ jet may be powered by neutrino--antineutrino ($ν\barν$) annihilation in a hyperaccreting disk formed during the core collapse of a massive star. Compared with the Blandford--Znajek process, neutrino annihilation can produce a dirtier jet through baryon entrainment from a neutrino-driven wind. EP241113a-like events therefore offer new insight into the dissipation physics and launching mechanisms of jets from collapsing massive stars.

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亮点

用低 Γ 下光球外移、热化半径外移和更弱多普勒增宽统一解释 EP241113a 的极低 E_p;把脏火球能谱软化与 NDAF 中微子湮灭引擎挂钩,提供了从瞬时辐射诊断中心引擎的新途径。

脉络与展望

此前对 GRB 光球辐射的研究已给出谱峰由热化与 Compton 化过程调节的框架 Beloborodov 2013,耗散光球模型则为解释 X 射线闪与 GRB 谱提供了重要途径 Rees & Mészáros 2005。EP241113a 的出现把这一框架延伸到低洛伦兹因子、高重子载荷的脏火球参数区:低 Γ 使光球外移、热化半径外移,自然把 E_p 压到软 X 射线并偏离 Amati 关系。本文进一步将低 Γ 与 NDAF 中微子湮灭驱动的重子风联系起来,使能谱软化成为中心引擎诊断。未来更大的 EP/WXT 样本与红移测量可望检验这一光球主导分支是否系统地位于 Amati 关系下方,并区分中微子湮灭与 Blandford–Znajek 两类喷流引擎。

预印本 2026-08-04 · 接收 2026-07-09 · 刊出 2026-07-29 · 收录 2026-08-20

0308-24 补录
优先级 85 · 太阳耀斑 · VLF 电离层探测 · 数值模拟

Numerical study of multiple solar flare induced modulation of Very Low Frequency (VLF) diurnal profile

多太阳耀斑引起的甚低频(VLF)日变化廓线调制的数值研究

Sourav Palit, Subhajit Bhattacharyya, Taraknath Bera et al.

原文摘要Abstract

Earth's ionosphere is a perpetual detector of ionizing radiation received from celestial objects, particularly the Sun. Solar ionizing radiation in the form of extreme ultraviolet (EUV) and X-rays during both quiet and active phase of the Sun, and charged particles associated with a solar wind imprint their ionization signatures on the ionosphere. The ionization rate varies on a timescale from a few minutes, for small flares, up to a few years, following the solar cycle, and also depends on geographical location and altitude. Although due to the bipolar nature of the geomagnetic field, the events, such as the solar coronal mass ejections (CMEs) and associated solar wind enhancements, usually disturb the polar ionosphere only, the UV and X-rays from the solar flares produce sudden ionospheric disturbances (SIDs) in low-mid-latitude part of the earth's ionosphere. Such ionospheric disturbances are studied with the help of the influence they exert on radio waves propagating through earth-ionosphere waveguide. For the lower part of the ionosphere, called the D region, prominent modification in electron--ion density during solar flares can be observed via deviation in earth bound Very Low Frequency (VLF) wave signal from its ambient diurnal profile. In earlier work, successful model of the deviation in VLF amplitude due to different classes of solar flares were formulated. There, calculation of rate of ionization with Monte Carlo simulation and ion-chemistry evaluation of plasma density enhancement followed by a radio propagation simulation were used. Presently, we attempt to numerically reconstruct the modulation in the VLF signal from its diurnal pattern produced by multiple solar flares occurring during a 12-h sunlit period. This represents a significant extension of our previous works, which were limited to standalone, isolated transients. Successful reconstruction of the VLF signal modulation for such a complex flaring scenario points to the accuracy of our understanding for this specific complex scenario, and provides a proof-of-concept for using the earth's ionosphere as a space transient event detector under active solar conditions.

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亮点

将以往对孤立耀斑的建模扩展到多耀斑叠加的复杂情景,成功重建VLF信号调制,证明D区电离层响应模型在活跃太阳条件下仍可靠,为电离层监测空间瞬变事件提供概念验证。

脉络与展望

此前研究已建立针对不同级别太阳耀斑引起的VLF幅度偏离模型,流程包括蒙特卡洛模拟计算电离率、离子化学计算等离子体密度增强,再进行电波传播模拟。本文的主要推进在于把上述仅适用于孤立瞬态事件的方法扩展到12小时日照期内多个耀斑先后出现的复杂情景,并成功重建VLF信号对日变化轮廓的调制。这一成功重建说明模型对耀斑叠加下的D区域电离层响应和波导传播理解是可靠的。未来可进一步拓展到更高太阳活动水平、更长时段的连续观测,并结合地磁扰动等效应,使地球电离层成为复杂空间瞬变事件的宽带监测器。

刊出 2026-07-09 · 收录 2026-08-24

边缘相关 2 篇 · 低相关性展开 +
优先级 508-24 补录

Rotating black hole shadows in metric-affine bumblebee gravity

Nascimento, Jose R., Oliveira, Ana R. M., Petrov, Albert Yu., et al.

原文摘要Abstract

In this work, we investigate the structure of black hole shadows in the bumblebee gravity model formulated within the metric-affine framework, which incorporates spontaneous Lorentz symmetry breaking (LSB) through a vector field B<SUB>μ</SUB> with a non-zero vacuum expectation value. We analyze the influence of the dimensionless rotation parameter a = J/M and the Lorentz-violating (LV) coefficient X = ξb <SUP>2</SUP> on the photon sphere radius, the critical impact parameter, and the shadow morphology. Using ray-tracing simulations with the GYOTO code and accretion disks, we observe that increasing values of X induce progressive vertical flattening, asymmetric ``teardrop''-shaped deformations, and local collapse of the lower silhouette region, interacting with the rotational Doppler effect. These anisotropic signatures distinguish the bumblebee model from the standard Kerr metric and provide observational tests for LSB effects in strong gravity regimes, potentially detectable by the Event Horizon Telescope in sources such as M87* and Sgr A*.

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度规-仿射蜂鸣引力中的旋转黑洞阴影 · 研究度规-仿射蜂鸣引力模型中旋转黑洞阴影结构,发现洛伦兹破缺系数导致阴影垂直扁平、泪滴形变形等各向异性特征,可为强引力下LSB效应提供观测检验。

接收 2026-07-09 · 刊出 2026-08-19 · 收录 2026-08-24

优先级 508-31 补录

Gravitational waves from isocurvature perturbations of spectator scalar fields

Garcia, Marcos A. G., Verner, Sarunas

原文摘要Abstract

We present a mechanism for gravitational wave (GW) production from isocurvature perturbations in spectator scalar fields during inflation. These energetically subdominant fields develop blue-tilted power spectra through inflationary dynamics, generating second-order scalar perturbations that source a stochastic GW background. The mechanism naturally satisfies CMB constraints at large scales while producing enhanced signals at smaller scales across a broad frequency range 10<SUP>-20</SUP>--1 Hz. We perform comprehensive numerical and analytical calculations of the complete isocurvature spectrum evolution, including gravitational particle production, reheating dynamics, and scalar-induced GW generation. For spectator fields with effective masses 0.5 ≲ m <SUB> χ,eff</SUB>/H<SUB>I</SUB> , the resulting GW energy density reaches Ω<SUB>GW</SUB> h <SUP>2</SUP> ~ 10<SUP>-19</SUP>--10<SUP>-14</SUP>, accessible to pulsar timing arrays, space-based interferometers, and next-generation CMB experiments. Our analysis reveals that GW-induced constraints exceed current isocurvature bounds. We examine both unstable (curvaton-like) and stable (dark matter) spectator fields, demonstrating strong sensitivity to reheating temperature, inflaton-spectator coupling, and decay dynamics. This framework establishes isocurvature-sourced GWs as a powerful probe of early universe physics, enabling simultaneous constraints on inflationary dynamics, dark matter production, and reheating through coordinated multi-frequency GW observations.

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来自旁观标量场等曲率扰动的引力波 · 提出旁观标量场等曲率扰动在暴胀期间产生引力波的机制,计算其频谱与强度,并表明该信号可被脉冲星计时阵、空间干涉仪等实验探测。

接收 2026-07-09 · 刊出 2026-08-27 · 收录 2026-08-31