Description
Chair: W. Yuan (National Astronomical Observatories, Chinese Academy of Sciences)
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Hirofumi Noda (Tohoku University)12/12/2024, 10:4520m
According to the unified model of active galactic nuclei (AGNs), a dusty torus is formed around a broad-line region, accretion disk, and corona near a supermassive black hole (SMBH), and these structures produce multi-wavelength radiation. Studying the structures in not only type-1 but also type-2 AGNs is important to understand e.g., the growth of a SMBH via mass accretion and the AGN...
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Chichuan Jin (National Astronomical Observatories, Chinese Academy of Sciences)12/12/2024, 11:0520m
The Einstein Probe (EP) is a newly launched space mission dedicated to the X-ray all-sky survey and characterization of all kinds of high-energy transients. During the first few months of in-orbit operation, EP has discovered dozens of new X-ray transients with intriguing properties. In this talk, I will present a few typical examples of TDE candidates discovered by EP since its launch,...
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Huaqing Cheng (National Astronomical Observatories, Chinese Academy of Sciences)12/12/2024, 11:2515m
The broad-band emission (optical/UV to X-ray) of luminous active galactic nuclei (AGNs) is believed to be powered by accretion onto central supermassive black holes, with the optical/UV emission generally explained as from the standard accretion disc, and the X-ray emission often explained as the inverse Compton scattering of the soft photons from the accretion disc in a hot corona above. This...
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Tomoshi Takeda (RIKEN/Tokyo university of Science)12/12/2024, 11:4015m
NinjaSat is the RIKEN's 6U-size X-ray CubeSat launched on 2023 November 11. The main instrument is Xe-based proportional counter covering the energy range of 2--50~keV. Just after we finished the satellite commissioning in 2024 February, the new X-ray transient SRGA J144459.2-604207 appeared. NinjaSat observed SRGA J1444 from 2024 from February 21 to March 18. Meanwhile, NinjaSat detected 12...
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Satoshi Sugita (AoyamaGakuin University)12/12/2024, 11:5515m
MAXI scans about 85% of the whole sky in its orbital period (92 min) by sweeping the sky with a slit-shaped field-of-view (FOV). It can cover a large localized area of a GW event detected by GW detectors and search for an emission from the area before the time of the GW trigger. From the start of LIGO’s operation, MAXI has searched for X-ray counterparts of GW events and reported on upper...
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Tianying Lian (National Astronomical Observatories, Chinese Academy of Science (NAOC))poster
The core of active galactic nuclei (AGN) may be surrounded by numerous clouds in diverse physical states. These clumpy clouds can randomly obscure the central X-ray source, leading to eclipse events. Recent studies indicated that such events are likely common in AGN. However, the complete eclipse events are rarely discovered, because they require extensive X-ray monitoring spanning years. In...
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Xiaobo Li (Institute of High Energy Physics)poster
As China's first X-ray astronomy satellite, the Hard X-ray Modulation Telescope (HXMT) has been successfully operational in orbit for about 7 years. It is equipped with three payloads, covering band ranging from 1 to 250 keV. This poster aims to provide a comprehensive overview of HXMT's operational status, with a focus on its scientific proposals, data products, the performance of its three...
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Yuta Kawakubo (Aoyama Gakuin University)poster
In the past two decades, multi-wavelength observations of astronomical objects and phenomena using electromagnetic waves have become commonplace. Furthermore, multi-messenger astronomy, which includes messengers beyond electromagnetic waves, such as gravitational waves and neutrinos, is emerging as the new standard. The Multi-Messenger Observation Database and Viewer compile and visualize...
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Yu Miyazato (Chiba University)poster
In recent years, magnetic turbulence in the hot coronae of Seyfert galaxies has been proposed as a potential source for high-energy neutrino production. This model predicts that the signal strength of neutrinos originating from the coronae correlates with X-ray intensity, and experimentally constraining this correlation could provide a deeper understanding of high-energy neutrino and cosmic...
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Dr Akira Dohi (RIKEN)poster
Recently, (Type-I) X-ray bursts have been observed in a neutron star SRGA J144459.2-604207 by various X-ray satellites, firstly INTEGRAL and NinjaSat (Atel: 16485, 16495). To summarize their observations shortly, in the early phase, they show very regular behavior, i.e., Clocked bursters, but in the latter phase, they become irregular. From such a Clocked burster with various properties, we...
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Qinyu Wu (National Astronomical Observatories, Chinese Academy of Sciences)poster
Extragalactic Fast X-ray Transients (eFXTs) are defined as short flares in X ray with cosmological origins. But the nature of eFXT is still uncertain due to the lack of timely follow up observations. The possible physical mechanisms include the shock breakout of a supernova, the fireball phase of a nova, the magnetar powered X-ray emission after the mergers of binary neutron stars, off-axis...
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Yuta Kondo (Aoyamagakuin University)poster
In the O4a period of gravitational wave observation, only two LIGO observatories were available, and thus, a 90% credible region was typically several percent to several tens of percent of the whole sky. Therefore, we need instruments with a wide field of views. Monitor of All-sky X-ray Image (MAXI) is an X-ray detector aboard the International Space Station (ISS). MAXI is sensitive to X-rays...
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Alok Gupta (ARIES, Nainital)poster
It is a well established fact that AGNs show large amplitude flux and occasional quasi periodic oscillations (QPOs) in their X-ray light curves. For the last 1.5 decades, my group has extensively worked on searching for X-ray variations in two subclasses of active galactic nuclei (AGNs) namely narrow line Seyfert 1 (NLSy1) and blazars. We have used various X-ray missions e.g. MAXI, XMM-Newton,...
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