Thermal Electrons in an Ultra-Relativistic Shock Shape the Optical Afterglow of GRB 250702F

利用 Ondřejov D50 望远镜对 GRB 250702F 的早期光学观测发现,其光变曲线中的陡峭衰减阶段无法用非热电子解释,而是由超相对论激波中热电子群体的同步辐射频率扫过光学波段所致,这一发现为无碰撞激波中热电子的存在提供了关键证据。

Martin Jelínek, Annarita Ierardi, Filip Novotný, Gor Oganesyan, Biswajit Banerjee, Dimitrios Giannios, Sergey Karpov, Martin Topinka, Elias Kammoun, Jan Štrobl, Alberto J. Castro-TiradoMon, 09 Ma🔭 astro-ph

A search for optical counterparts in quiescent black hole X-ray transients

该研究利用 ULTRACAM 测光观测结合 DECaPS 和 Pan-STARRS 巡天数据,成功识别了四个此前无光学对应体的候选黑洞 X 射线暂现源,并为另外五个目标提供了 quiescent 态的光度下限及精化天体测量数据,从而为后续动力学质量测量和伴星性质研究奠定了基础。

I. V. Yanes-Rizo, J. Casares, M. A. P. Torres, V. S. Dhillon, T. R. Marsh, M. Armas Padilla, P. G. Jonker, T. Muñoz-Darias, S. Navarro Umpiérrez, D. SteeghsMon, 09 Ma🔭 astro-ph

SuperSNEC: Fast and Accurate Light Curve Production for Large Hydrodynamic Model Grids Using Adaptive Gridding

本文介绍了 SuperSNEC,这是一种通过自适应网格技术将超新星爆炸代码(SNEC)的模拟速度提升约 420 倍,同时保持光变曲线精度(100 个网格与 1000 个网格基准的均方根残差仅为 0.022 星等)的加速工具,适用于大规模流体动力学模型网格的快速生成及对剥离包层超新星的参数推断。

Christoffer Fremling, K-Ryan HindsMon, 09 Ma🔭 astro-ph

Fingerprints of Individual Supermassive Black Hole Binaries in Pulsar Timing Arrays

该论文提出了一种基于超大规模黑洞双星在脉冲星计时阵列中产生的独特空间关联“指纹”的新方法,通过推导解析重叠缩减函数并验证其能有效打破随机背景与单源信号的简并,显著提升了源定位精度并提供了比相干匹配滤波更稳健的探测途径。

Chiara M. F. Mingarelli, Bjorn Larsen, Ellis Eisenberg, Qinyuan Zheng, Forrest HutchisonMon, 09 Ma🔭 astro-ph

Searching for precessing binary systems with mode-by-mode filtering and marginalization

该论文提出了一种结合模式分解滤波、边缘化处理及机器学习技术的新型方法,通过分别滤波并边缘化自旋进动谐波的信噪比,将引力波双黑洞搜索的敏感体积提升了约 10%。

Zihan Zhou, Digvijay Wadekar, Javier Roulet, Oryna Ivashtenko, Tejaswi Venumadhav, Tousif Islam, Ajit Kumar Mehta, Jonathan Mushkin, Mark Ho-Yeuk Cheung, Barak Zackay, Matias ZaldarriagaMon, 09 Ma🔭 astro-ph

Multiwavelength quasi-periodic variability of the blazar Ton 599

本文基于1983至2025年的多波段观测数据,发现TeV耀变体Ton 599存在显著的准周期性光变,其多波段辐射的相关性及多种特征周期(1.4至7.5年)表明,该现象是由双超大质量黑洞系统的轨道运动与喷流进动等几何效应,以及喷流内部激波等随机过程共同调制所致。

Yu. V. Sotnikova (Special Astrophysical Observatory of the Russian Academy of Sciences, Nizhny Arkhyz, 369167, Russia), T. V. Mufakharov (Special Astrophysical Observatory of the Russian Academy of Sciences, Nizhny Arkhyz, 369167, Russia, Xinjiang Astronomical Observatory, Chinese Academy of Sciences, 150 Science-1 Street, Urumqi 830011, China), A. E. Volvach (Crimean Astrophysical Observatory of the Russian Academy of Sciences, 298409, Nauchny, Russia), V. V. Vlasyuk (Special Astrophysical Observatory of the Russian Academy of Sciences, Nizhny Arkhyz, 369167, Russia), M. L. Khabibullina (Special Astrophysical Observatory of the Russian Academy of Sciences, Nizhny Arkhyz, 369167, Russia), A. G. Mikhailov (Special Astrophysical Observatory of the Russian Academy of Sciences, Nizhny Arkhyz, 369167, Russia), T. An (State Key Laboratory of Radio Astronomy and Technology, Shanghai Astronomical Observatory, Chinese Academy of Sciences, 80 Nandan Road, Shanghai 200030, China, Guizhou Radio Astronomical Observatory, Guizhou University, 550000, Guiyang, China), D. O. Kudryavtsev (Special Astrophysical Observatory of the Russian Academy of Sciences, Nizhny Arkhyz, 369167, Russia), Yu. A. Kovalev (Lebedev Physical Institute of Russian Academy of Sciences, Leninsky prosp. 53, Moscow 119991, Russia, Institute for Nuclear Research, Russian Academy of Sciences, 60th October Anniversary Prospect 7a, Moscow 117312, Russia), Y. Y. Kovalev (Max Planck Institute for Radio Astronomy, Auf dem Hügel 69, Bonn 53121, Germany), A. V. Popkov (Moscow Institute of Physics and Technology, Institutsky per. 9, Dolgoprudny 141700, Russia, Lebedev Physical Institute of Russian Academy of Sciences, Leninsky prosp. 53, Moscow 119991, Russia), S. S. Savchenko (Saint Petersburg State University, 7/9 Universitetskaya nab., St. Petersburg, 199034, Russia, Pulkovo Observatory, St. Petersburg, 196140, Russia), A. K. Erkenov (Special Astrophysical Observatory of the Russian Academy of Sciences, Nizhny Arkhyz, 369167, Russia), D. A. Morozova (Saint Petersburg State University, 7/9 Universitetskaya nab., St. Petersburg, 199034, Russia), T. A. Semenova (Special Astrophysical Observatory of the Russian Academy of Sciences, Nizhny Arkhyz, 369167, Russia), O. I. Spiridonova (Special Astrophysical Observatory of the Russian Academy of Sciences, Nizhny Arkhyz, 369167, Russia), M. A. Kharinov (Institute of Applied Astronomy of the Russian Academy of Sciences, Kutuzova Embankment 10, St. Petersburg 191187, Russia), I. A. Rakhimov (Institute of Applied Astronomy of the Russian Academy of Sciences, Kutuzova Embankment 10, St. Petersburg 191187, Russia), T. S. Andreeva (Institute of Applied Astronomy of the Russian Academy of Sciences, Kutuzova Embankment 10, St. Petersburg 191187, Russia), L. Cui (Xinjiang Astronomical Observatory, Chinese Academy of Sciences, 150 Science-1 Street, Urumqi 830011, China), X. Wang (Xinjiang Astronomical Observatory, Chinese Academy of Sciences, 150 Science-1 Street, Urumqi 830011, China), N. Chang (Xinjiang Astronomical Observatory, Chinese Academy of Sciences, 150 Science-1 Street, Urumqi 830011, China), R. Yu. Udovitskiy (Special Astrophysical Observatory of the Russian Academy of Sciences, Nizhny Arkhyz, 369167, Russia), P. G. Zhekanis (Special Astrophysical Observatory of the Russian Academy of Sciences, Nizhny Arkhyz, 369167, Russia), G. A. Borman (Crimean Astrophysical Observatory of the Russian Academy of Sciences, 298409, Nauchny, Russia), T. S. Grishina (Saint Petersburg State University, 7/9 Universitetskaya nab., St. Petersburg, 199034, Russia), E. N. Kopatskaya (Saint Petersburg State University, 7/9 Universitetskaya nab., St. Petersburg, 199034, Russia), E. G. Larionova (Saint Petersburg State University, 7/9 Universitetskaya nab., St. Petersburg, 199034, Russia), I. S. Troitskiy (Saint Petersburg State University, 7/9 Universitetskaya nab., St. Petersburg, 199034, Russia), Yu. V. Troitskaya (Saint Petersburg State University, 7/9 Universitetskaya nab., St. Petersburg, 199034, Russia), A. A. Vasilyev (Saint Petersburg State University, 7/9 Universitetskaya nab., St. Petersburg, 199034, Russia), A. V. Zhovtan (Crimean Astrophysical Observatory of the Russian Academy of Sciences, 298409, Nauchny, Russia), D. V. Kratov (Special Astrophysical Observatory of the Russian Academy of Sciences, Nizhny Arkhyz, 369167, Russia), L. N. Volvach (Crimean Astrophysical Observatory of the Russian Academy of Sciences, 298409, Nauchny, Russia), E. V. Shishkina (Saint Petersburg State University, 7/9 Universitetskaya nab., St. Petersburg, 199034, Russia), A. I. Dmytrotsa (Crimean Astrophysical Observatory of the Russian Academy of Sciences, 298409, Nauchny, Russia), V. I. Zharov (Special Astrophysical Observatory of the Russian Academy of Sciences, Nizhny Arkhyz, 369167, Russia)Mon, 09 Ma🔭 astro-ph

SwinYNet: A Transformer-based Multi-Task Model for Accurate and Efficient FRB Search

本文提出了名为 SwinYNet 的基于 Transformer 的多任务模型,该模型无需耗时的去色散预处理即可直接从时频数据中实现快速射电暴(FRB)的检测、分割及参数估计,在模拟与实测数据中均展现出超越传统工具及现有 AI 基线的卓越精度与实时处理能力。

Yunchuan Chen, Shulei Ni, Chan Li, Jianhua Fang, Dengke Zhou, Huaxi Chen, Yi Feng, Pei Wang, Chenwu Jin, Han Wang, Bijuan Huang, Xuerong Guo, Donghui Quan, Di LiMon, 09 Ma🔭 astro-ph

X-Ray Intraday Variability of the Blazar OJ 287 Observed with XMM-Newton

本文利用 XMM-Newton 卫星对类星体 OJ 287 进行的八次 X 射线观测数据,分析了其日内变异性、波段间相关性及时变功率谱,揭示了软硬波段辐射的同源特性及红噪声主导特征,并指出粒子加速与同步辐射冷却机制共同驱动了该耀星的辐射过程。

Tao Huang, Alok C. Gupta, Lang Cui, Ashutosh Tripathi, Yongfeng Huang, P. U. Devanand, Xiang LiuMon, 09 Ma🔭 astro-ph

Accretion dynamics and coronal geometry in Mrk 530: Insights from 24 years of X-ray monitoring

该研究基于对 Seyfert 星系 Mrk 530 长达 24 年的 X 射线监测,揭示了吸积率的变化通过调节盘冕耦合机制,不仅主导了该源长期的光谱演化(如软超额的消失和冕区几何结构的改变),还引发了 2018 年观测到的紫外与 X 射线波段的准周期振荡现象。

Priyadarshee P. Dash, Prantik Nandi, Sachindra Naik, Narendranath Layek, Sandip K. ChakrabartiMon, 09 Ma🔭 astro-ph

Detection of quasi-periodic oscillations in the 37 GHz radio light curve of the blazar Ton 599 during 1990-2020

该研究利用 1990 至 2020 年间西梅伊斯 RT-22 射电望远镜在 37 GHz 波段对类星体 Ton 599 的观测数据,通过多种时域分析方法,探测到该源光变曲线中存在一个约 2.4 年的准周期振荡信号。

Alok C. Gupta, Alexandr E. Volvach, Shubham Kishore, Larisa N. Volvach, Paul J. Wiita, Lang Cui, Mauri J. Valtonen, Sandeep K. Mondal, Haritma GaurMon, 09 Ma🔭 astro-ph

Search for Periodic Radio Signals from Double Neutron Star System Companions Using the Fast Folding Algorithm

该研究利用 FAST 望远镜对 13 个双中子星系统进行了长达 272.2 小时的观测,并通过快速折叠算法(FFA)和轨道调制消除技术搜索伴星射电信号,虽成功提升了已知脉冲星的信噪比并探测到微弱信号,但未发现任何伴星信号。

Wenze Li, Zhichen Pan, Lei Qian, Liyun Zhang, Yujie Chen, Dejiang Yin, Baoda Li, Yinfeng Dai, Yaowei Li, Dongyue Jiang, Qiaoli Hao, Menglin Huang, Xingyi Wang, Xianghua Niu, Minglei Guo, Jinyou Song, Shuangyuan ChenMon, 09 Ma🔭 astro-ph

Size measurements and characterization of the astrophysical properties of multiple-component radio-AGNs in the ROGUE I catalog

本文基于 ROGUE I 目录,对手动测量的 2002 个多分量射电活动星系核进行了尺寸测定与表征,揭示了其物理属性、形态分类(如 FR I/II、弯曲尾等)与星系团环境及喷流稳定性之间的关联。

Arti Goyal, Arpita Misra, Subhrata Dey, Unnikrishnan Sureshkumar, Marion Soida, Anna Wojtowicz, Grazyna Stasinska, Natalia Vale Asari, Syed NaqviMon, 09 Ma🔭 astro-ph

The contribution to Galactic Centre {\gamma}-ray excess from cluster-born millisecond pulsars. Constraints from direct N-body simulations

该研究利用高分辨率直接 N 体模拟追踪球状星团中诞生并注入银河系中心的毫秒脉冲星,发现其累积产生的伽马射线辐射能够很好地解释银河系中心伽马射线超出(GCE)现象,从而支持其天体物理起源而非暗物质湮灭的解释。

M. Kalambay, M. Ishchenko, D. Kuvatova, T. Panamarev, P. BerczikMon, 09 Ma🔭 astro-ph

Disentangling the Galactic binary zoo: Machine learning classification of stellar remnant binaries in LISA data

该研究利用机器学习技术(特别是 XGBoost 集成算法)对 LISA 探测到的银河系致密双星进行有效分类,在高度不平衡的数据集中成功识别了绝大多数双白矮星系统和高能双星,并显著提升了中子星 - 白矮星等稀有且难以区分系统的分类精度。

Irwin Khai Cheng Tay, Valeriya Korol, Thibault LechienMon, 09 Ma🔭 astro-ph