Article
Astronomy & Astrophysics
Jorge Moreno, Paul Torrey, Sara L. Ellison, David R. Patton, Connor Bottrell, Asa F. L. Bluck, Maan H. Hani, Christopher C. Hayward, James S. Bullock, Philip F. Hopkins, Lars Hernquist
Summary: The study shows that close encounters in interacting galaxies significantly increase cool gas budgets, leading to enhanced star formation. Additionally, galaxies with high global star formation rates experience intense nuclear star formation enhancement in the central region, while those with low global SFR are suppressed in the central region.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2021)
Article
Astronomy & Astrophysics
Anna C. Wright, Michael Tremmel, Alyson M. Brooks, Ferah Munshi, Daisuke Nagai, Ray S. Sharma, Thomas R. Quinn
Summary: The study identifies the largest-ever simulated sample of field UDGs in the ROMULUS25 cosmological simulation volume, finding that isolated UDGs have similar properties to isolated dwarf galaxies but may have been overlooked in current surveys. The formation of UDGs is attributed to early mergers and redistribution of star formation, leading to lower central SFRs and steeper negative color gradients. This unique formation channel suggests that UDGs can potentially be formed through multiple mechanisms.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2021)
Article
Astronomy & Astrophysics
A. Morales-Vargas, J. P. Torres-Papaqui, F. F. Rosales-Ortega, M. Chow-Martinez, J. J. Trejo-Alonso, R. A. Ortega-Minakata, A. C. Robleto-Orus, F. J. Romero-Cruz, D. M. Neri-Larios
Summary: The study reveals that tidal interactions influence star formation in galaxies, with higher star-formation rates and lower oxygen abundances in tidally perturbed regions. Statistical analysis confirms these observations, suggesting a link between tidal interactions and galaxy evolution.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2021)
Article
Astronomy & Astrophysics
Guangquan Zeng, Lan Wang, Liang Gao
Summary: The study investigates the formation history of massive disc galaxies in the IllustrisTNG hydrodynamical simulation to understand why some of these galaxies can maintain their disc morphology throughout cosmic time. The research shows that some massive disc galaxies have quiet merger histories, others experience an increase in bulge components before becoming discs again, and some survive prominent mergers yet remain disc-like. The morphology of merger remnants strongly depends on the orbit type of major mergers, with spiral-in falling orbits leading to disc-dominant remnants and head-on galaxy-galaxy collisions mostly forming ellipticals.
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(2021)
Article
Astronomy & Astrophysics
E. Tollet, A. Cattaneo, A. Maccio, X. Kang
Summary: We have analyzed cosmological zoom simulations to study the accretion modes in galaxies. By using an entropy criterion based on the intergalactic medium equation of state, we find that cold- and hot-mode accretion can be successfully distinguished. Feedback from supernovae plays a crucial role in increasing the fraction of stellar mass from the hot circumgalactic medium. Comparing with the GALICS 2.1 model, we find that the shock-stability criterion implemented in GALICS 2.1 reproduces the transition from cold- to hot-mode accretion.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2022)
Article
Astronomy & Astrophysics
B. Namumba, J. Roman, J. Falcon-Barroso, J. H. Knapen, R. Ianjamasimanana, E. Naluminsa, G. I. G. Jozsa, M. Korsaga, N. Maddox, B. Frank, S. Sikhosana, S. Legodi, C. Carignan, A. A. Ponomareva, T. Jarrett, D. Lucero, O. M. Smirnov, J. M. van der Hulst, D. J. Pisano, K. Malek, L. Marchetti, M. Vaccari, M. Jarvis, M. Baes, M. Meyer, E. A. K. Adams, H. Chen, J. Delhaize, S. H. A. Rajohnson, S. Kurapati, I. Heywood, L. Verdes-Montenegro
Summary: The transformation and evolution of a galaxy are influenced by interactions with its environment, which can be traced using neutral hydrogen (H I). This study presents H I observations of the previously thought to be isolated spiral galaxy NGC 895, revealing possible interaction features and newly discovered H I companions that suggest it is not truly isolated. Combining these observations with deep optical images, the absence of tidal debris between NGC 895 and its companions is shown, but the presence of excess light in the outer parts of the companion galaxy suggests external perturbation and possible interactions.
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(2023)
Article
Astronomy & Astrophysics
Mallory D. Thorp, Sara L. Ellison, Hsi-An Pan, Lihwai Lin, David R. Patton, Asa F. L. Bluck, Dan Walters, Jillian M. Scudder
Summary: This work presents spatially resolved measurements of CO emission collected with ALMA for mergers selected from the MaNGA and AlMaQUEST surveys. The study finds that merger-induced star formation can be driven by a variety of mechanisms, both within a galaxy and between different mergers, regardless of interaction stage.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2022)
Article
Astronomy & Astrophysics
Philip F. Hopkins, Alexander B. Gurvich, Xuejian Shen, Zachary Hafen, Michael Y. Grudic, Shalini Kurinchi-Vendhan, Christopher C. Hayward, Fangzhou Jiang, Matthew E. Orr, Andrew Wetzel, Dusan Keres, Jonathan Stern, Claude-Andre Faucher-Giguere, James Bullock, Coral Wheeler, Kareem El-Badry, Sarah R. Loebman, Jorge Moreno, Michael Boylan-Kolchin, Eliot Quataert
Summary: Through numerical experiments and existing simulations, we find that the transition from irregular/spheroidal to discy galaxies is primarily driven by the gravitational potential. Factors such as gas supply, cooling/thermodynamics, star formation model, Toomre scale, galaxy dynamical times, and feedback properties do not directly cause these transitions. Disc formation is promoted by a centrally concentrated mass profile, which provides a stable dynamical center and prevents the destruction of discs. Smooth star formation is promoted by a sufficiently large escape velocity at the star formation radii, trapping mass-loaded outflows near the galaxy.
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(2023)
Article
Astronomy & Astrophysics
Amelie Dumont, Hugo Martel
Summary: Tidal dwarf galaxies, formed in galactic mergers, are typically more metal-rich than regular dwarfs. Despite the lower initial metal abundance in their progenitors, these dwarf galaxies end up with high metal abundances due to rapid enrichment during mergers.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2021)
Article
Astronomy & Astrophysics
Michael W. Topping, Daniel P. Stark, Ryan Endsley, Rychard J. Bouwens, Sander Schouws, Renske Smit, Mauro Stefanon, Hanae Inami, Rebecca A. A. Bowler, Pascal Oesch, Valentino Gonzalez, Pratika Dayal, Elisabete da Cunha, Hiddo Algera, Paul van Der Werf, Andrea Pallottini, Laia Barrufet, Raffaella Schneider, Ilse De Looze, Laura Sommovigo, Lily Whitler, Luca Graziani, Yoshinobu Fudamoto, Andrea Ferrara
Summary: This study presents specific star formation rates (sSFRs) for 40 UV-bright galaxies at high redshifts, using improved SFR calibrations and SED-based stellar masses. The results show that the sSFRs derived from far-infrared continuum emission are higher than those derived from UV+optical SEDs. The study also suggests the possibility of spatial variations in dust across these galaxies and finds that sSFRs increase rapidly with redshifts, consistent with expectations from baryon accretion rates.
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(2022)
Article
Astronomy & Astrophysics
M. Symeonidis, M. J. Page
Summary: The study shows that the most IR-luminous galaxies are typically powered by AGN, and that the high-luminosity tails of the IR galaxy LF and IR AGN LF converge at different redshifts up to around 2.5. AGN have an impact on the average dust temperatures of galaxies and the shape of the L-IR-T-d(ust) relation.
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(2021)
Article
Astronomy & Astrophysics
K. George, S. Subramanian
Summary: The study reveals that some barred galaxies may lack star formation in their central regions, but still have star formation outside the bar. By examining their positions on SFR-M-star plots, galaxies can be classified into centrally quenched and globally quenched categories. There may be a correlation between the length of the bar and the SFR of galaxies that are fully quenched due to stellar bars.
ASTRONOMY & ASTROPHYSICS
(2021)
Article
Astronomy & Astrophysics
I. Millan-Irigoyen, M. G. del Valle-Espinosa, R. Fernandez-Aranda, L. Galbany, J. M. Gomes, M. Moreno-Raya, A. R. Lopez-Sanchez, M. Molla
Summary: In this study, we investigate galaxies hosting type Ia supernova (SN Ia) at different redshifts, using Gran Telescopio de Canarias (GTC) optical spectroscopy and inverse stellar population synthesis. We estimate the star formation and enrichment histories of these galaxies and find a clear correlation between the Hubble residuals and stellar metallicity. These results are important for understanding galaxy evolution and the mechanisms behind SN Ia explosions.
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(2022)
Article
Astronomy & Astrophysics
Kristi A. Webb, Alexa Villaume, Seppo Laine, Aaron J. Romanowsky, Michael Balogh, Pieter van Dokkum, Duncan A. Forbes, Jean Brodie, Christopher Martin, Matt Matuszewski
Summary: In this study, the star formation history (SFH) of the ultradiffuse galaxy DF44 was investigated based on photometry and spectroscopy. The results suggest that DF44 went through early star formation and rapid quenching, challenging some simulation-based scenarios of UDG formation.
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(2022)
Article
Astronomy & Astrophysics
Milena Valentini, Klaus Dolag, Stefano Borgani, Giuseppe Murante, Umberto Maio, Luca Tornatore, Gian Luigi Granato, Cinthia Ragone-Figueroa, Andreas Burkert, Antonio Ragagnin, Elena Rasia
Summary: The study reveals that linking molecular gas with star formation rate is crucial in cosmological simulations of galaxy formation. It also suggests that different models of calculating the molecular fraction of cold gas can significantly impact the properties and morphology of galaxies.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2023)
Article
Astronomy & Astrophysics
C. M. Baugh, Cedric G. Lacey, Violeta Gonzalez-Perez, Giorgio Manzoni
Summary: A new model is introduced to compute the luminosity of emission lines in star-forming galaxies, which is successfully applied in the semi-analytical galaxy formation code GALFORM. The model combines pre-computed grid of H II region models with empirical determination of H II regions properties dependence on macroscopic properties of galaxies. The new model accurately reproduces the locus of star-forming galaxies on standard line ratio diagnostic diagrams and shows evolution with redshift.
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(2022)
Article
Astronomy & Astrophysics
Filip Husko, Cedric G. Lacey, Joop Schaye, Matthieu Schaller, Folkert S. J. Nobels
Summary: In this study, a black hole spin evolution and jet feedback model is implemented into a hydrodynamics code to simulate galaxy groups and clusters. The results show that jet feedback successfully suppresses gas cooling and star formation in all systems, with different strengths and effects observed in clusters of different masses.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2022)
Article
Astronomy & Astrophysics
Filip Husko, Cedric G. Lacey, Carlton M. Baugh
Summary: We used the GALFORM semi-analytical model and the Planck-Millennium simulation to study the origins of stellar mass in galaxies and their spheroids. We found that the fraction of ex situ mass increases sharply with galaxy mass, reaching 80% at M-* = 10(11.3) M-circle dot. Major mergers contribute about half of the ex situ mass, while disc instabilities and their associated starbursts dominate for intermediate-mass spheroids at z=0. The predicted pseudo-bulge fraction by GALFORM may be too high, and merger-induced starbursts are negligible except at high redshifts.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2023)
Article
Astronomy & Astrophysics
Arnau Quera-Bofarull, Chris Done, Cedric G. Lacey, Mariko Nomura, Ken Ohsuga
Summary: This article introduces a non-hydrodynamical approach to calculate the UV-bright accretion disc in AGNs and its resulting wind. The updated QWIND model improves the calculation of wind absorption and corrects for relativistic effects on wind velocity. The model predicts that winds can reach velocities up to (0.1-0.5)c and carry mass loss rates up to 80% of the accreted mass.
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(2023)
Article
Astronomy & Astrophysics
Carolina Cuesta-Lazaro, Takahiro Nishimichi, Yosuke Kobayashi, Cheng-Zong Ruan, Alexander Eggemeier, Hironao Miyatake, Masahiro Takada, Naoki Yoshida, Pauline Zarrouk, Carlton M. Baugh, Sownak Bose, Baojiu Li
Summary: In this series of papers, a simulation-based model for non-linear clustering of galaxies is presented, consisting of separate modelling of clustering in real space and velocity statistics. The authors demonstrate the accuracy of a neural network emulator for real-space galaxy clustering and show how it can be combined with a galaxy-halo connection model to predict the galaxy correlation function. The study also highlights the potential biases introduced by a vanilla halo model in the analysis of future data sets.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2023)
Article
Astronomy & Astrophysics
Filip Husko, Cedric G. Lacey
Summary: This study presents the first hydrodynamical tests of active galactic nuclei (AGN) jets using smoothed particle hydrodynamics. The simulation results show agreement with theoretical predictions for the lengths, radii, and shapes of the jet-inflated lobes in the intracluster medium (ICM). The jets transition from a ballistic phase to a self-similar phase, and a significant amount of the injected energy is transferred to the ICM in the form of kinetic energy.
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(2023)
Article
Astronomy & Astrophysics
Filip Husko, Cedric G. Lacey
Summary: We use the code SWIFT to simulate the evolution of bubbles inflated by AGNs jets and their interactions with the ICM. Our findings show that most of the energy injected into the jets is quickly transferred to the ICM, with 70% in thermal form and the rest in kinetic. At late times, the bubbles draw out filaments of low-entropy gas, buoyancy dominates the energetics, and the originally injected energy is mainly in the form of gravitational potential energy. We propose that jet feedback not only heats the ICM, but also reduces the central gas density through uplift, delaying cooling.
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(2023)
Article
Astronomy & Astrophysics
Joscha N. Jahns-Schindler, Laura G. Spitler, Charles R. H. Walker, Carlton M. Baugh
Summary: Fast radio bursts (FRBs) are cosmological radio sources that vary on millisecond timescales and provide a unique probe of the Universe. This study aims to estimate the fraction of FRB hosts with measured redshifts using simulations of FRB surveys and host galaxies. The results show that 20-40% of CHIME FRB hosts will be observed in an SDSS-like survey, while the deeper DELVE survey will detect 63-85% of ASKAP FRBs. CHIME FRBs can reach redshifts up to 3, but ground-based follow-up is limited to redshifts less than 1.5.
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(2023)
Article
Astronomy & Astrophysics
Roi Kugel, Joop Schaye, Matthieu Schaller, John C. Helly, Joey Braspenning, Willem Elbers, Carlos S. Frenk, Ian G. Mccarthy, Juliana Kwan, Jaime Salcido, Marcel P. van Daalen, Bert Vandenbroucke, Yannick M. Bahe, Josh Borrow, Evgenii Chaikin, Filip Husko, Adrian Jenkins, Cedric G. Lacey, Folkert S. J. Nobels, Ian Vernon
Summary: In order to quantify the impact of baryonic effects on cosmological observables, researchers calibrated AGN and stellar feedback models using machine learning. They used emulators to link changes in subgrid parameters to changes in observables and found models that exceeded the observationally allowed range.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2023)