Early-stage Evolution of Quasi-periodic Eruptions

Tomoya Suzuguchi

Kyoto University

Quasi-Periodic Eruption (QPE) is a phenomenon in which the X-ray luminosity curve shows quasi-periodic bursts near the center of a galaxy. The burst interval is a few hours to a few days, the duration is 10% of the burst interval, the peak luminosity is about $10^{41-43}\,{\rm erg}\,{\rm s}^{-1}$, and the...

Relativistic Godunov SPH Simulations of High-Velocity Jets from Compact Astrophysical Objects

Kanta Kitajima

Nagoya University

Relativistic jets are widely observed in astronomical objects including active galactic nuclei and gamma-ray bursts. However, the acceleration mechanisms that drive these jets are not yet fully understood. Recent studies have shown that when a jet possesses an initial velocity corresponding to approximately 90% of the speed of light, it...

Low frequency radio observation with MWA and SKA Low exploring the cosmic dawn and epoch of reionization

Shintaro Yoshiura

National Astronomical Observatory of Japan

The Square Kilometre Array (SKA) Low and Mid, the world's largest radio telescopes, are currently under construction in Australia and South Africa. Covering frequency ranges of 50–350 MHz for SKA Low and 350 MHz–15.4 GHz for SKA Mid, the SKA will enable a wide range of scientific studies, leveraging its...

Tracing Early Galaxy Formation with FirstLight Zoom-In Simulations: Statistical Insights and Inner Structures of $z>6$ Galaxies

Yurina Nakazato

University of Tokyo

Recent JWST observations have revealed a wealth of detail about high-redshift galaxies, including strong [OIII] emission and clumpy structures. To interpret these observations, we utilize FirstLight zoom-in simulations with pc-scale resolution. This talk will discuss: (1) the physical properties of [OIII] emitters and the use of line diagnostics, (2) the...

Theoretical models of optically-thick accretion disk corona

Norita Kawanaka

NAOJ/Tokyo Metropolitan University

This talk is about modelling the X-ray emission from black hole accretion discs. We discuss the standard model for these discs, and how this model needs to be modified in order to explain the observational data, in particular from super-Eddington discs and X-ray binaries. The standard model is a simple...

Formation of Young Massive Clusters by Fast HI Gas Collision

Ryunosuke Maeda

Tohoku University

We present simulations of the formation of young massive clusters (YMCs) through high-velocity collisions of HI gas in the Large Magellanic Cloud. The simulation models the magnetized interstellar gas dynamics, including the effects of self-gravity, heating/cooling, and stellar feedback. The results show that fast collisions of HI gas can form...

IMF transition across various environments in the early universe

Ito Mana

Tohoku University

We study the thermal evolution of star-forming clouds in the primordial halos at $z>100$, considering the effect of the cosmic microwave background (CMB). The CMB inhibits the formation of H2 via the photodissociation of H-, resulting in a higher temperature than in the standard evolution of the first stars at...

An Improved Analytic Model for Reionization

Michael Wyatt

UCLA

The first wave of observations with JWST has revealed a striking overabundance of luminous galaxies at early times ($z > 10$) compared to models of galaxies calibrated to pre-JWST data. Early observations have also uncovered a large population of supermassive black holes (SMBHs) at $z > 6$. Because many of...

56^th Colloquium Early-stage Evolution of Quasi-periodic Eruptions

Tomoya Suzuguchi (Kyoto University)

55^th Colloquium Relativistic Godunov SPH Simulations of High-Velocity Jets from Compact Astrophysical Objects

Kanta Kitajima (Nagoya University)

54^th Colloquium Low frequency radio observation with MWA and SKA Low exploring the cosmic dawn and epoch of reionization

Shintaro Yoshiura (National Astronomical Observatory of Japan)

53^rd Colloquium Tracing Early Galaxy Formation with FirstLight Zoom-In Simulations: Statistical Insights and Inner Structures of $z>6$ Galaxies

Yurina Nakazato (University of Tokyo)

52^nd Colloquium Theoretical models of optically-thick accretion disk corona

Norita Kawanaka (NAOJ/Tokyo Metropolitan University)

51^st Colloquium Formation of Young Massive Clusters by Fast HI Gas Collision

Ryunosuke Maeda (Tohoku University)

50^th Colloquium IMF transition across various environments in the early universe

Ito Mana (Tohoku University)

49^th Colloquium An Improved Analytic Model for Reionization

Michael Wyatt (UCLA)

48^th Colloquium Investigating Black Hole-Disk-Jet System through Polarization Images

Yuh Tsunetoe (Harvard University)

47^th Colloquium Protoplanetary disk evolution: fragmentation and dust ring formation

Ryoki Matsukoba (Kyoto University)

46^th Colloquium Formation of dense filaments induced by runaway supermassive black holes

Go Ogiya (Zhejiang University)

45^th Colloquium Probing quasar proximity zones with Lyman-alpha emission: Can we guess quasar’s age?

Ryuichiro Hada (Ohio Stsate University)

44^th Colloquium State Transitions and Time Variations of Black Hole Accretion Flows

Ryoji Matsumoto (Chiba University)

43^rd Colloquium A fierce new challenge: unveiling the connection between the first galaxies and reionization

Enrico Garaldi (Max-Planck-Institut für Astrophysik)

42^nd Colloquium Computing the Universe: from Intergalactic to Interstellar Medium

Renyue Cen (Princeton University)

41^st Colloquium Probing dust aggregate structure in protoplanetary disks by millimeter-wave polarization

Ryo Tazaki (University of Tohoku)

40^th Colloquium Radiation hydrodynamical simulations of first-star binaries including radiative feedback

Kazuyuki Sugimura (University of Tohoku)

39^th Colloquium Uncovering the formation of extremely distant galaxies with ALMA

Takuya Hashimoto (Osaka Sangyo University / NAOJ)

38^th Colloquium The most rapidly growing black holes: Narrow Line Seyfert 1s across cosmic time

Chris Done (University of Durham)

37^th Colloquium Fragmentation in self-gravitating accretion disks; Influence of binary systems

Jannes Klee (University of Kiehl)

36^th Colloquium A New Stellar Population in the Bulge, and a new survey

R. Michael Rich (University of California, Los Angeles (UCLA))

35^th Colloquium What young stars' infrared variability reveals about protoplanetary disks

Neal Turner (Jet Propulsion Laboratory, Caltech)

34^th Colloquium Density scratches and formation processes of primordial dark matter haloes via dry mergers

Go Ogiya (LMU/MPI)

33^rd Colloquium The composition of interstellar molecular gas in galaxies

Nanase Harada (Academia Sinica Institute of Astronomy and Astrophysics (ASIAA))

32^nd Colloquium Radiation transport calculation of the thermal radiation from gamma-ray burst jets

Sanshiro Shibata (Konan University)

31^st Colloquium (Part 1) Dancing in the dark: galactic properties trace spin swings along the cosmic web

Yohan Dubois (IAP)

31^st Colloquium (Part 2) Exploring the Role of AGN Feedback in Galaxy Formation

Rebekka Bieri (IAP)

30^th Colloquium The Epoch of Reionization: observations and simulations

Benoît Semelin (LERMA, Observatoire de Paris)

29^th Colloquium A Dynamically Collapsing Cloud Core and a Precursor of a Core in a Filament Supported by Turbulent and Magnetic Pressures

Rei Furuya (Tokushima University)

28^th Colloquium Watching a Little Gas Cloud on its Way into the Galactic Supermassive Black Hole

Andreas Burkert (Ludwig Maximilians Universität München)

27^th Colloquium (Part 1) Puzzling Features of Quasar Accretion

Charles Steinhardt (Kavli IPMU)

27^th Colloquium (Part 3) The Evolution of Star-Forming Galaxies Over Cosmic Time

Josh Speagle (Harvard University, Kavli IPMU)