317 citations · 1.2k across the 32 of their papers we have counts for
33 papers
Dynamical evolution of dark matter subhaloes in the Milky Way: role of the Galactic disc
Junnan Shen, Go Ogiya, Jens Stücker
Dark matter (DM) subhaloes orbiting inside the Milky Way (MW) are promising targets for DM searches, and reliable predictions for the detectability and spatial distribution of thei…
Recovering the infall mass for Milky Way satellite galaxy Sextans
Tingting Tian, Jiang Chang, Go Ogiya +2
Understanding the formation and evolution of the Milky Way (MW) requires detailed knowledge of its satellite galaxies. In this study, we focus on the Sextans dwarf spheroidal (dSph…
Imprints of tidal interactions on the stellar distribution of satellite galaxies: implications for dark matter deficient galaxies
Zhihao Yin, Go Ogiya, Frank C. van den Bosch
Interactions with the host galaxy strip stars and dark matter from the outer regions of satellite galaxies. Meanwhile, some stars from the central regions can migrate outward due t…
New insights on low-mass dark matter subhalo tidal tracks via numerical simulations
Alejandra Aguirre-Santaella, Miguel A. Sánchez-Conde, Go Ogiya
Many studies assert that dark matter (DM) subhaloes without a baryonic counterpart and with an inner cusp always survive no matter the strength of the tidal force they undergo. In…
Prograde and retrograde stars in nuclear cluster mergers. Evolution of the supermassive black hole binary and the host galactic nucleus
Alessandra Mastrobuono-Battisti, Pau Amaro Seoane, Màrius Josep Fullana i Alfonso +5
We address the orbital distribution of stars in merging nuclear star clusters (NSCs) and the subsequent effects on supermassive black hole binary (SMBHB) evolution. We ran direct-s…
Environmental effects on Low Surface Brightness Galaxies in the IllustrisTNG simulation
Luis Enrique Pérez-Montaño, Bernardo Cervantes Sodi, Vicente Rodriguez-Gomez +2
Employing the TNG100 run of the IllustrisTNG project, we characterize the environment of Low Surface Brightness Galaxies (LSBGs) across varying scales, from their associated dark m…
Examining the effects of dark matter spikes on eccentric intermediate mass ratio inspirals using N-body simulations
Diptajyoti Mukherjee, A. Miguel Holgado, Go Ogiya +1
Recent studies suggest that dark matter (DM) spikes around intermediate-mass black holes could cause observable dephasing in gravitational wave (GW) signals from Intermediate Mass…
Formation of dense filaments induced by runaway supermassive black holes
Go Ogiya, Daisuke Nagai
A narrow linear object extending from the centre of a galaxy at redshift has recently been discovered and interpreted as shocked gas filament formi…
Searching for clues of past binary supermassive black hole mergers in nuclear star clusters
Alessandra Mastrobuono-Battisti, Go Ogiya, Oliver Hahn +1
Galaxy mergers are common processes in the Universe. As a large fraction of galaxies hosts at their centres a central supermassive black hole (SMBH), mergers can lead to the format…
The effect of stellar encounters on the dark matter annihilation signal from prompt cusps
Jens Stücker, Go Ogiya, Simon D. M. White +1
Prompt cusps are the densest quasi-equilibrium dark matter objects; one forms at the instant of collapse within every isolated peak of the initial cosmological density field. They…
Testing the galaxy collision induced formation scenario for the trail of dark matter deficient galaxies with the susceptibility of globular clusters to the tidal force
Go Ogiya, Frank C. van den Bosch, Andreas Burkert +1
It has been suggested that a trail of diffuse galaxies, including two dark matter deficient galaxies (DMDGs), in the vicinity of NGC1052 formed because of a high-speed collision be…
Shedding light on low-mass subhalo survival and annihilation luminosity with numerical simulations
Alejandra Aguirre-Santaella, Miguel A. Sánchez-Conde, Go Ogiya +2
In this work, we carry out a suite of specially-designed numerical simulations to shed further light on dark matter (DM) subhalo survival at mass scales relevant for gamma-ray DM s…
Tidal Stripping in the Adiabatic Limit
Jens Stücker, Go Ogiya, Raul E. Angulo +2
We present a model for the remnants of haloes that have gone through an adiabatic tidal stripping process. We show that this model exactly reproduces the remnant of an NFW halo tha…
Dark matter cores in massive high- galaxies formed by baryonic clumps
Go Ogiya, Daisuke Nagai
The rotation curves of some star forming massive galaxies at redshift two decline over the radial range of a few times the effective radius, indicating a significant deficit of dar…
Evolution of Massive Black Hole Binaries in Collisionally Relaxed Nuclear Star Clusters -- Impact of Mass Segregation
Diptajyoti Mukherjee, Qirong Zhu, Go Ogiya +2
Massive Black Hole (MBH) binaries are considered to be one of the most important sources of Gravitational Waves (GW) that can be detected by GW detectors like LISA. However, there…
On the Tidal Formation of Dark Matter Deficient Galaxies
Go Ogiya, Frank C. van den Bosch, Andreas Burkert
Previous studies have shown that dark matter deficient galaxies (DMDG) such as NGC1052-DF2 (hereafter DF2) can result from tidal stripping. An important question, though, is whethe…
Evolution of subhalo orbits in a smoothly-growing host halo potential
Go Ogiya, James E. Taylor, Michael J. Hudson
The orbital parameters of dark matter (DM) subhaloes play an essential role in determining their mass-loss rates and overall spatial distribution within a host halo. Haloes in cosm…
Dynamical self-friction: how mass loss slows you down
Tim B. Miller, Frank C. van den Bosch, Sheridan B. Green +1
We investigate dynamical self-friction, the process by which material that is stripped from a subhalo torques its remaining bound remnant, which causes it to lose orbital angular m…
Accelerated orbital decay of supermassive black hole binaries in merging nuclear star clusters
Go Ogiya, Oliver Hahn, Chiara M. F. Mingarelli +1
The coalescence of supermassive black holes (SMBHs) should generate the strongest sources of gravitational waves (GWs) in the Universe. However, the dynamics of their coalescence i…
DASH: a library of dynamical subhalo evolution
Go Ogiya, Frank C. van den Bosch, Oliver Hahn +3
The abundance and demographics of dark matter substructure is important for many areas in astrophysics and cosmological -body simulations have been the primary tool used to inve…
Tidal stripping as a possible origin of the ultra diffuse galaxy lacking dark matter
Go Ogiya
Recent observations revealed a mysterious ultra diffuse galaxy, NGC1052-DF2, in the group of a large elliptical galaxy, NGC1052. Compared to expectations from abundance matching mo…
Physical and numerical stability and instability of AGN bubbles in a hot intracluster medium
Go Ogiya, Pawel Biernacki, Oliver Hahn +1
While feedback from Active Galactic Nuclei (AGN) is an important heating source in the centre of galaxy clusters, it is still unclear how the feedback energy is injected into the i…
Dark Matter Substructure in Numerical Simulations: A Tale of Discreteness Noise, Runaway Instabilities, and Artificial Disruption
Frank C. van den Bosch, Go Ogiya
To gain understanding of the complicated, non-linear and numerical processes associated with the tidal evolution of dark matter subhaloes in numerical simulation, we perform a larg…
Disruption of Dark Matter Substructure: Fact or Fiction?
Frank C. van den Bosch, Go Ogiya, Oliver Hahn +1
Accurately predicting the demographics of dark matter (DM) substructure is of paramount importance for many fields of astrophysics, including gravitational lensing, galaxy evolutio…