Article
Astronomy & Astrophysics
Yi-Ming Zhong, Daneng Yang, Hai-Bo Yu
Summary: The presence of a central baryonic potential significantly affects the gravothermal evolution of self-interacting dark matter (SIDM) haloes. By incorporating a static baryonic potential in a fluid model and calibrating it with N-body simulations, the study reveals changes in SIDM halo properties and an accelerated evolution of the halo. A quasi-universality in the gravothermal evolution of SIDM haloes with the baryonic potential is observed, offering a framework for testing SIDM predictions using observations of galactic systems.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2023)
Article
Astronomy & Astrophysics
J. Mendez-Abreu, A. de Lorenzo-Caceres, S. F. Sanchez
Summary: The study reveals differences in the mass-size relation between bulges and discs in high-mass galaxies, as well as a correlation between the Sersic index of bulges and both galaxy and bulge mass. The results support an inside-out formation of nearby non-barred galaxies and suggest that early properties of bulges influence the future evolution of the galaxy.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2021)
Article
Astronomy & Astrophysics
Sebastian Trujillo-Gomez, J. M. Diederik Kruijssen, Joel Pfeffer, Marta Reina-Campos, Robert A. Crain, Nate Bastian, Ivan Cabrera-Ziri
Summary: By using cosmological simulations and deep learning, we can predict the origin of globular clusters (GCs) and reconstruct the assembly histories of galaxies. Our method achieves high accuracy on simulated data and can predict the classification accuracy on real galaxies based on observational data.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2023)
Article
Astronomy & Astrophysics
Virginia Cuomo, Victor P. Debattista, Sarah Racz, Stuart Robert Anderson, Peter Erwin, Oscar A. Gonzalez, J. W. Powell, Enrico Maria Corsini, Lorenzo Morelli, Mark A. Norris
Summary: The short-lived buckling instability is responsible for the formation of some box/peanut (B/P) shaped bulges in barred galaxies, while other B/P bulges form through resonant trapping of stars. The difference lies in the symmetry breaking during buckling, which creates residual mid-plane asymmetry. Simulations and diagnostic tests on galaxies indicate that B/P bulges formed through strong buckling are rare in the past 5 billion years. Mid-plane asymmetry is not observed in galaxies with B/P bulges, suggesting either resonant trapping or buckling events more than 5 Gyr ago as the formation mechanisms.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2023)
Article
Astronomy & Astrophysics
Stuart Robert Anderson, Victor P. Debattista, Peter Erwin, David J. Liddicott, Nathan Deg, Leandro Beraldo E. Silva
Summary: The study develops an automated algorithm to detect 'flat' profiles of bars and demonstrates that these profiles are a result of the bar's secular growth. The study also finds that shoulder regions are related to the growth of the bar but do not indicate the age of the bar due to possible destruction or absence of shoulders caused by other factors.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2022)
Article
Astronomy & Astrophysics
Abdolhosein Hashemizadeh, Simon P. Driver, Luke J. M. Davies, Aaron S. G. Robotham, Sabine Bellstedt, Caroline Foster, Benne W. Holwerda, Matt Jarvis, Steven Phillipps, Malgorzata Siudek, Jessica E. Thorne, Rogier A. Windhorst, Christian Wolf
Summary: This study presents a structural analysis of galaxies with different types within a specific redshift range, revealing the growth and dominance of spheroidal structures over time, suggesting the importance of the processes and pathways involved in their formation and transformation.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2022)
Article
Astronomy & Astrophysics
J. Reddish, K. Kraljic, M. S. Petersen, K. Tep, Y. Dubois, C. Pichon, S. Peirani, F. Bournaud, H. Choi, J. Devriendt, R. Jackson, G. Martin, M. J. Park, M. Volonteri, S. K. Yi
Summary: We used the NEWHORIZON simulation to study the redshift evolution of bar properties and fractions within galaxies. The simulation reveals a missing bars problem in cosmological simulations, with a low bar fraction in Milky Way-like progenitors. The analysis suggests that low mass galaxies are dominated by dark matter and have difficulty forming bars, while more massive galaxies have large bulges preventing bar persistence at low redshift. This investigation confirms that the bar fraction evolution provides stringent constraints on the assembly history of baryons and dark matter onto galaxies.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2022)
Article
Astronomy & Astrophysics
Bogdan C. Ciambur, Francesca Fragkoudi, Sergey Khoperskov, Paola Di Matteo, Francoise Combes
Summary: This paper explores the formation of double peanut structures in barred galaxies, finding that while the inner structure stabilizes early and experiences little evolution, the outer structure gradually evolves over time. Both structures are dynamically coupled to the same bar but are supported by inherently different mechanisms.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2021)
Article
Astronomy & Astrophysics
Polychronis Papaderos, Iris Breda, Andrew Humphrey, Jean Michel Gomes, Bodo L. Ziegler, Cirino Pappalardo
Summary: Our understanding of the photometric and structural properties of bulges in late-type galaxies is based on image decomposition and modeling, but the conventional exponential model neglects the effect of star formation quenching in the centers of these galaxies. This leads to an underestimation of the true luminosity of the bulge and impacts its structural characterization and color gradients.
ASTRONOMY & ASTROPHYSICS
(2022)
Article
Astronomy & Astrophysics
Jorge Sanchez Almeida, Ignacio Trujillo
Summary: Cores are present in self-gravitating systems of dark matter and can be used as evidence for systems in thermodynamic equilibrium. Theoretical expectations of core formation are consistent with numerical simulations when thermalizing collisions are allowed.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2021)
Article
Astronomy & Astrophysics
Alister W. Graham, Nandini Sahu
Summary: We present revised scaling relations between black hole mass and spheroid stellar mass, as well as galaxy stellar mass, based on color-dependent stellar mass-to-light ratios. By decomposing luminosities obtained at 3.6 micrometers, we consider various components and show how disc-galaxy mergers explain the offset between lenticular galaxy bulges and elliptical galaxies. We confirm a steep scaling relation for spiral galaxies and discuss the implications of this work, including the role of mergers in shaping the high-mass end of the galaxy mass function.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2023)
Article
Astronomy & Astrophysics
Da Bi, Isaac Shlosman, Emilio Romano-Diaz
Summary: The study investigates the morphology, kinematics, and stellar populations of main galaxies in dark matter haloes in different redshifts using high-resolution simulations. Despite evolving in different epochs, galaxies' global parameters remain stable, but there are significant differences in morphology, kinematics, and stellar populations.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2022)
Article
Astronomy & Astrophysics
Martin D. Weinberg
Summary: It has been found that spherical stellar systems have weakly damped response modes. Through N-body simulations and linear-response theory, it has been discovered that small wiggles in the distribution function can destabilize dipole modes. These findings are important for understanding the instabilities in dark matter haloes and other spherical systems.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2023)
Article
Astronomy & Astrophysics
Dexter S. -H Hon, Alister W. Graham, Nandini Sahu
Summary: We analyzed the relation between bulge/spheroid size-stellar mass and spheroid structural parameters for 202 local galaxies. We found a strong correlation between spheroid size and mass, and the local spheroids are structurally similar to high-z quiescent galaxies.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2023)
Article
Astronomy & Astrophysics
Martin P. Rey, Andrew Pontzen, Oscar Agertz, Matthew D. A. Orkney, Justin Read, Amelie Saintonge, Stacy Y. Kim, Payel Das
Summary: The interplay between feedback and mass-growth histories introduces scatter in the relationship between stellar and neutral gas properties of faint dwarf galaxies. Simulations show that dwarf galaxies with stellar masses between 10^5 to 10^6 solar masses exhibit bimodality in their cold gas content, either being H I-rich or H I-deficient. Stellar feedback plays a significant role in creating disturbed and time-variable neutral gas distributions.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2022)
Article
Astronomy & Astrophysics
T. Kirihara, Y. Miki, M. Mori, T. Kawaguchi, R. M. Rich
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2017)
Article
Astronomy & Astrophysics
T. Kirihara, Y. Miki, M. Mori
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2017)
Article
Astronomy & Astrophysics
Yohei Miki, Masayuki Umemura
Article
Astronomy & Astrophysics
Yohei Miki, Masao Mori, Toshihiro Kawaguchi, Yuriko Saito
ASTROPHYSICAL JOURNAL
(2014)
Article
Astronomy & Astrophysics
Toshihiro Kawaguchi, Yuriko Saito, Yohei Miki, Masao Mori
ASTROPHYSICAL JOURNAL LETTERS
(2014)
Article
Astronomy & Astrophysics
Takanobu Kirihara, Yohei Miki, Masao Mori
PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF JAPAN
(2014)
Article
Astronomy & Astrophysics
Pierre Boldrini, Yohei Miki, Alexander Y. Wagner, Roya Mohayaee, Joseph Silk, Alexandre Arbey
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2020)
Article
Astronomy & Astrophysics
Yohei Miki, Masao Mori, Toshihiro Kawaguchi
Summary: Massive black holes exist in almost every galaxy, with an active period for a few 10(8) years. Galaxy collisions can suppress black hole fuelling, leading to the shutdown of nucleus activity, which may be associated with galaxy merging events.
Proceedings Paper
Computer Science, Hardware & Architecture
Yohei Miki
PROCEEDINGS OF THE 48TH INTERNATIONAL CONFERENCE ON PARALLEL PROCESSING (ICPP 2019)
(2019)
Article
Astronomy & Astrophysics
Yohei Miki, Masao Mori, R. Michael Rich
ASTROPHYSICAL JOURNAL
(2016)
Proceedings Paper
Physics, Multidisciplinary
Go Ogiya, Masao Mori, Yohei Miki, Taisuke Boku, Naohito Nakasato
24TH IUPAP CONFERENCE ON COMPUTATIONAL PHYSICS (IUPAP-CCP 2012)
(2013)
Proceedings Paper
Physics, Multidisciplinary
Yohei Miki, Masao Mori, Toshihiro Kawaguchi
24TH IUPAP CONFERENCE ON COMPUTATIONAL PHYSICS (IUPAP-CCP 2012)
(2013)
Proceedings Paper
Physics, Multidisciplinary
Takanobu Kirihara, Yohei Miki, Masao Mori
24TH IUPAP CONFERENCE ON COMPUTATIONAL PHYSICS (IUPAP-CCP 2012)
(2013)
Article
Astronomy & Astrophysics
Yutaka Komiyama, Masashi Chiba, Mikito Tanaka, Masayuki Tanaka, Takanobu Kirihara, Yohei Miki, Masao Mori, Robert H. Lupton, Puragra Guhathakurta, Jason S. Kalirai, Karoline Gilbert, Evan Kirby, Myun Gyoon Lee, In Sung Jang, Sanjib Sharma, Kohei Hayashi
ASTROPHYSICAL JOURNAL
(2018)