Article
Astronomy & Astrophysics
S. H. Lim, D. Barnes, M. Vogelsberger, H. J. Mo, D. Nelson, A. Pillepich, K. Dolag, F. Marinacci
Summary: The study compares the physical properties of ionized gas in the circumgalactic medium and intergalactic medium between observations and four cosmological hydrodynamical simulations, highlighting variations in gas pressure in haloes and significant differences in gas temperature between observations and simulations.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2021)
Article
Astronomy & Astrophysics
Seunghwan Lim, Douglas Scott, Arif Babul, David J. Barnes, Scott T. Kay, Ian G. McCarthy, Douglas Rennehan, Mark Vogelsberger
Summary: This study shows that current galaxy formation models do not predict enough star formation in protoclusters to match observations, with predicted star formation rates significantly lower than those seen in reality. By analyzing a well-studied protocluster core, it is found that star formation efficiency of protocluster galaxies is higher than predicted. The impact of numerical resolution on the simulations is significant, with a decrease in spatial resolution leading to a drop in star formation rates.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2021)
Article
Astronomy & Astrophysics
Seunghwan Lim, Ryley Hill, Douglas Scott, Ludovic van Waerbeke, Jean-Charles Cuillandre, Raymond G. Carlberg, Nora Elisa Chisari, Andrej Dvornik, Thomas Erben, Stephen Gwyn, Alan W. McConnachie, Marc-Antoine Miville-Deschenes, Angus H. Wright, Pierre-Alain Duc
Summary: In this study, the cross-correlation between the cosmic far-infrared background and cosmic optical background fluctuations is investigated using Herschel-SPIRE imaging and CFIS Low Surface Brightness data products from UNIONS. The cross-spectrum is measured for two cases: all galaxies are kept in the images or all individually detected galaxies are masked to produce 'background' maps. The study reports the detection of the crosscorrelation signal at λ≥18 arcsec (≥14 sigma sion) and demonstrates the potential of the approach for future surveys.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2023)
Article
Astronomy & Astrophysics
Andrea Afruni, Gabriele Pezzulli, Filippo Fraternali, Asger Gronnow
Summary: Through simulations, it has been discovered that clouds in the circumgalactic medium are dissolved by the hot corona, thus unable to fuel galaxy formation. This implies that present-day massive galaxies can sustain their star formation only through the spontaneous or induced cooling of their hot corona.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2023)
Article
Astronomy & Astrophysics
Zachary Hafen, Jonathan Stern, James Bullock, Alexander B. Gurvich, Sijie Yu, Claude-Andre Faucher-Giguere, Drummond B. Fielding, Daniel Angles-Alcazar, Eliot Quataert, Andrew Wetzel, Tjitske Starkenburg, Michael Boylan-Kolchin, Jorge Moreno, Robert Feldmann, Kareem El-Badry, T. K. Chan, Cameron Trapp, Dusan Keres, Philip F. Hopkins
Summary: The study suggests that a key factor in the formation of thin stellar discs in Milky Way-mass galaxies is the aligned angular momentum distribution of accreting gas before joining the galaxy; galaxies with a thick disc or irregular morphology lack gas angular momentum alignment. Simulation results indicate a strong correlation between rotating cooling flow accretion mode and thin disc galaxies.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2022)
Article
Astronomy & Astrophysics
Ben Moews, Romeel Dave, Sourav Mitra, Sultan Hassan, Weiguang Cui
Summary: The study explores the merging of an equilibrium model with a machine learning framework to create a high-speed hydrodynamic simulation emulator, which can populate galactic dark matter haloes with baryonic properties in cosmological simulations. The results demonstrate that this hybrid system enables the fast completion of dark matter information while discussing the advantages and disadvantages of hybrid versus machine learning-only frameworks.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2021)
Article
Astronomy & Astrophysics
Lucas M. Valenzuela, Benjamin P. Moster, Rhea-Silvia Remus, Joseph A. O'Leary, Andreas Burkert
Summary: The study proposes an empirical model for the number of globular clusters (GCs) in galaxies based on a tight relationship between dark matter halo virial masses and GC numbers. While a simple base model forming GCs in low-mass halos can explain this relationship, a second formation pathway is needed to explain younger GC populations. The scatter of the linear relationship is strongly correlated with the relative amount of smooth accretion, indicating that the number of GCs in a galaxy is a good tracer for its dark matter mass.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2021)
Article
Astronomy & Astrophysics
Geoff G. Murphy, Robert M. Yates, Shazrene S. Mohamed
Summary: The analysis in the L-GALAXIES 2020 model shows that the gradual stripping of satellites and realistic radial profiles are crucial for accurately modeling stellar halo formation on all scales. The stellar haloes contribute only about 0.1% of the total circumgalactic medium enrichment, predominantly ejecting carbon produced by asymptotic giant branch stars. The study also finds that stellar haloes are responsible for a minimal fraction of the total intracluster medium enrichment, with the intracluster stellar component exceeding the contribution from the brightest cluster galaxy by z = 0.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2022)
Article
Astronomy & Astrophysics
M. Icaza-Lizaola, Richard G. Bower, Peder Norberg, Shaun Cole, Matthieu Schaller
Summary: We use sparse regression methods (SRMs) to accurately predict the stellar mass of galaxies based on properties of their dark matter halos. Our methodology simplifies the modeling process and achieves comparable accuracy as other machine learning algorithms. By removing the distinction between central and satellite galaxies, we can model their evolution based solely on halo growth history. The SRM model can reproduce important galaxy properties and could be used for large-scale structure surveys.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2023)
Article
Astronomy & Astrophysics
Jonathan S. Gomez, N. D. Padilla, J. C. Helly, C. G. Lacey, C. M. Baugh, C. D. P. Lagos
Summary: This study investigates the effect of using different halo finders and merger tree building algorithms on galaxy properties. The results show that the stellar mass function is not affected by the halo and merger tree finder, but the number of central and satellite galaxies in the model depends slightly on the halo finder and tree builder. Additionally, the number of galaxies without resolved subhaloes strongly depends on the tree builder. The distributions of stellar masses, cold and hot gas masses, and star formation rates agree well between different halo finders and tree builders.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2022)
Article
Astronomy & Astrophysics
Luis Enrique Perez-Montano, Vicente Rodriguez-Gomez, Bernardo Cervantes Sodi, Qirong Zhu, Annalisa Pillepich, Mark Vogelsberger, Lars Hernquist
Summary: We explore low surface brightness galaxies (LSBGs) in the TNG100 hydrodynamic cosmological simulation and find that they exist across a wide range of stellar masses. Compared to high surface brightness galaxies (HSBGs), LSBGs show significant differences in mass and morphology. LSBGs are hosted by more massive haloes with higher baryonic fraction, and they have higher specific stellar angular momentum and halo spin parameter values. These characteristics contribute to the extended nature of LSBGs and their hosting of less massive black holes at their centers.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2022)
Article
Astronomy & Astrophysics
Matthew D. A. Orkney, Justin Read, Martin P. Rey, Imran Nasim, Andrew Pontzen, Oscar Agertz, Stacy Y. Kim, Maxime Delorme, Walter Dehnen
Summary: Researchers have found that gravitational potential fluctuations within the central region of simulated ultra-faint dwarf galaxies kinematically heat dark matter particles, lowering the central dark matter density. By modifying the initial conditions of the dwarfs, they showed that a delayed assembly history leads to more late minor mergers, resulting in further dark matter heating. Late major mergers can regenerate a central dark matter cusp, suggesting significant stochasticity in the central dark matter density slopes of the smallest dwarfs.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2021)
Article
Astronomy & Astrophysics
Dylan Nelson, Chris Byrohl, Celine Peroux, Kate H. R. Rubin, Joseph N. Burchett
Summary: The study predicts widespread extended Mg II emission haloes surrounding star-forming galaxies, with brightness exceeding 10^(-19) erg s^(-1) cm^(-2) arcsec^(-2) in the central 10 s of kpc. The size of these haloes increases with galaxy mass and environmental density, showing a structured and asymmetric distribution.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2021)
Article
Astronomy & Astrophysics
Boon Kiat Oh, Hongjun An, Eun-jin Shin, Ji-hoon Kim, Sungwook E. Hong
Summary: This study applies a novel machine learning method to calibrate sub-grid models within numerical simulation codes, achieving convergence with observations and between different codes. By using active learning and neural density estimators, the machine is able to automatically calibrate hyperparameters. Through parameter tuning in cosmological zoom simulations, a better agreement with observations is obtained compared to manual calibration. The method is also applied to reconcile metal transport between grid-based and particle-based simulations, revealing a lesser-known relation between diffusion coefficient and metal mass in the halo region.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2022)
Article
Astronomy & Astrophysics
James Aird, Alison L. Coil
Summary: The study finds that AGNs reside in similar mass host dark matter haloes across cosmic time, primarily due to the rising AGN fraction in galaxies with increasing stellar mass and the exacerbating effect of AGN selection biases. While the median (sub)halo mass of AGNs remains fairly constant, the full halo mass distribution function spans several orders of magnitude. Additionally, interpreting AGN clustering in terms of relative bias to galaxy samples is more informative than absolute bias measurements alone.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2021)
Article
Chemistry, Physical
Shunkai Li, Shukai Cheng, Liwu Mo, Min Deng
Article
Physics, Multidisciplinary
Hao-Ran Yu, Pavel Motloch, Ue-Li Pen, Yu Yu, Huiyuan Wang, Houjun Mo, Xiaohu Yang, Yipeng Jing
PHYSICAL REVIEW LETTERS
(2020)
Article
Astronomy & Astrophysics
Shuang Zhou, H. J. Mo, Cheng Li, Mederic Boquien, Graziano Rossi
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2020)
Article
Astronomy & Astrophysics
Kai Wang, H. J. Mo, Cheng Li, Jiacheng Meng, Yangyao Chen
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2020)
Article
Astronomy & Astrophysics
Xiaohu Yang, Haojie Xu, Min He, Yizhou Gu, Antonios Katsianis, Jiacheng Meng, Feng Shi, Hu Zou, Youcai Zhang, Chengze Liu, Zhaoyu Wang, Fuyu Dong, Yi Lu, Qingyang Li, Yangyao Chen, Huiyuan Wang, Houjun Mo, Jian Fu, Hong Guo, Alexie Leauthaud, Yu Luo, Jun Zhang, Ying Zu
Summary: The researchers successfully extended the group finder to use data with photometric or spectroscopic redshifts and evaluated its performance using a high-resolution N-body simulation. The detected groups showed high accuracy in most cases and millions of groups were found in the DESI legacy imaging surveys.
ASTROPHYSICAL JOURNAL
(2021)
Article
Astronomy & Astrophysics
Fu-Heng Liang, Cheng Li, Niu Li, Shuang Zhou, Renbin Yan, Houjun Mo, Wei Zhang
Summary: The research shows a positive correlation between the high-mass slope of the stellar initial mass function and stellar metallicity, with steeper initial mass functions preferred at higher metallicities. This correlation remains consistent even when binary population models are considered.
ASTROPHYSICAL JOURNAL
(2021)
Article
Multidisciplinary Sciences
Zhicheng He, Guilin Liu, Tinggui Wang, Guobin Mou, Richard Green, Weihao Bian, Huiyuan Wang, Luis C. Ho, Mouyuan Sun, Lu Shen, Nahum Arav, Chen Chen, Qingwen Wu, Hengxiao Guo, Zesen Lin, Junyao Li, Weimin Yi
Summary: Quasar outflows may have a crucial role in regulating their host galaxies. Through the study of their kinematic information, it has been found that quasar outflows accelerate at a scale of about 10 parsecs and carry about 1% of the total quasar energy. Furthermore, the coupling between dust and quasar radiation may play a significant role in galaxy evolution.
Article
Astronomy & Astrophysics
Renjie Li, Huiyuan Wang, H. J. Mo, Shuiyao Huang, Neal Katz, Xiong Luo, Weiguang Cui, Hao Li, Xiaohu Yang, Ning Jiang, Yuning Zhang
Summary: This study investigates the properties and evolution of intergalactic and intracluster media in different types of the cosmic web using reconstructed initial conditions and constrained hydrodynamic simulations. The simulations reveal that warm-hot intergalactic gas is primarily associated with filaments in the local cosmic web, and there is a strong correlation between gas temperature and the strength of the local tidal field. The simulations also predict the presence of discontinuities related to shock fronts and contact edges.
ASTROPHYSICAL JOURNAL
(2022)
Article
Astronomy & Astrophysics
Xiao Li, Cheng Li, H. J. Mo, Ting Xiao, Jing Wang
Summary: We present a new H I mass estimator that provides unbiased H I mass estimates for optical samples like SDSS. We apply this estimator to study the H I mass function of local galaxies and the H I-halo mass relation. Our results show that the discrepancies between different measurements are primarily caused by cosmic variance.
ASTROPHYSICAL JOURNAL
(2022)
Article
Astronomy & Astrophysics
Zhenyuan Wang, Yangyao Chen, Yi Mao, Houjun Mo, Huiyuan Wang, Hong Guo, Cheng Li, Jian Fu, Yipeng Jing, Jing Wang, Xiaohu Yang, Zheng Zheng
Summary: The study investigates the nonlinear effects of halo clustering and H i content modulation on the bias of H i gas, finding that their competition results in a model-dependent redshift sweet spot near z = 1 where the bias is scale-independent down to small scales. Additionally, it is observed that the linear H i bias scales approximately linearly with redshift for z <= 3.
ASTROPHYSICAL JOURNAL
(2021)
Article
Astronomy & Astrophysics
Pengfei Li, Huiyuan Wang, H. J. Mo, Enci Wang, Hui Hong
ASTROPHYSICAL JOURNAL
(2020)
Article
Astronomy & Astrophysics
Jingjing Shi, Huiyuan Wang, Houjun Mo, Mark Vogelsberger, Luis C. Ho, Min Du, Dylan Nelson, Annalisa Pillepich, Lars Hernquist
ASTROPHYSICAL JOURNAL
(2020)
Article
Astronomy & Astrophysics
S. H. Lim, H. J. Mo, Huiyuan Wang, Xiaohu Yang
ASTROPHYSICAL JOURNAL
(2020)