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.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(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.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(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.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(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.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(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.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(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.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(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.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(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
Engineering, Aerospace
Hajime Sugai, Naoyuki Tamura, Hiroshi Karoji, Atsushi Shimono, Naruhisa Takato, Masahiko Kimura, Youichi Ohyama, Akitoshi Ueda, Hrand Aghazarian, Marcio Vital de Arruda, Robert H. Barkhouser, Charles L. Bennett, Steve Bickerton, Alexandre Bozier, David F. Braun, Khanh Bui, Christopher M. Capocasale, Michael A. Carr, Bruno Castilho, Yin-Chang Chang, Hsin-Yo Chen, Richard C. Y. Chou, Olivia R. Dawson, Richard G. Dekany, Eric M. Ek, Richard S. Ellis, Robin J. English, Didier Ferrand, Decio Ferreira, Charles D. Fisher, Mirek Golebiowski, James E. Gunn, Murdock Hart, Timothy M. Heckman, Paul T. P. Ho, Stephen Hope, Larry E. Hovland, Shu-Fu Hsu, Yen-Shan Hu, Pin Jie Huang, Marc Jaquet, Jennifer E. Karr, Jason G. Kempenaar, Matthew E. King, Olivier Le Fevre, David Le Mignant, Hung-Hsu Ling, Craig Loomis, Robert H. Lupton, Fabrice Madec, Peter Mao, Lucas Souza Marrara, Brice Menard, Chaz Morantz, Hitoshi Murayama, Graham J. Murray, Antonio Cesar de Oliveira, Claudia Mendes de Oliveira, Ligia Souza de Oliveira, Joe D. Orndorff, Rodrigo de Paiva Vilaca, Eamon J. Partos, Sandrine Pascal, Thomas Pegot-Ogier, Daniel J. Reiley, Reed Riddle, Leandro Santos, Jesulino Bispo dos Santos, Mark A. Schwochert, Michael D. Seiffert, Stephen A. Smee, Roger M. Smith, Ronald E. Steinkraus, Laerte Sodre, David N. Spergel, Christian Surace, Laurence Tresse, Clement Vidal, Sebastien Vives, Shiang-Yu Wang, Chih-Yi Wen, Amy C. Wu, Rosie Wyse, Chi-Hung Yan
JOURNAL OF ASTRONOMICAL TELESCOPES INSTRUMENTS AND SYSTEMS
(2015)
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Astronomy & Astrophysics
Richard C. Y. Chou, Carrie R. Bridge, Roberto G. Abraham
ASTROPHYSICAL JOURNAL
(2012)
Proceedings Paper
Astronomy & Astrophysics
Shiang-Yu Wang, Richard C. Y. Chou, Pin-Jie Huang, Yin-Chang Chang, Hung-Hsu Ling, Chi-Hung Yan, Jennifer Karr, Shu-Fu Hsu, Hsin-Yo Chen, Yen-Shan Hu, James E. Gunn, Dan J. Reiley, Naoyuki Tamura, Naruhisa Takato, Yuki Moritani, Atsushi Shimono
GROUND-BASED AND AIRBORNE INSTRUMENTATION FOR ASTRONOMY VII
(2018)
Proceedings Paper
Astronomy & Astrophysics
Shiang-Yu Wang, David F. Braun, Mark A. Schwochert, Pin-Jie Huang, Masahiko Kimura, Hsin-Yo Chen, Dan J. Reiley, Peter Mao, Charles D. Fisher, Naoyuki Tamura, Yin-Chang Chang, Yen-Sang Hu, Hung-Hsu Ling, Chih-Yi Wen, C. -Y. Chou Richard, Naruhisa Takato, Hajime Sugai, Youichi Ohyama, Hiroshi Karoji, Atsushi Shimono, Akitoshi Ueda
GROUND-BASED AND AIRBORNE INSTRUMENTATION FOR ASTRONOMY V
(2014)
Article
Astronomy & Astrophysics
R. C. Keenan, S. Foucaud, R. De Propris, B. C. Hsieh, L. Lin, R. C. Y. Chou, S. Huang, J. H. Lin, K. H. Chang
ASTROPHYSICAL JOURNAL
(2014)
Proceedings Paper
Astronomy & Astrophysics
Richard C. Y. Chou, Carrie R. Bridge, Roberto G. Abraham
GALAXY MERGERS IN AN EVOLVING UNIVERSE
(2013)
Article
Astronomy & Astrophysics
Richard C. Y. Chou, A. B. Peck, J. Lim, S. Matsushita, S. Muller, S. Sawada-Satoh, Dinh-V Trung
ASTROPHYSICAL JOURNAL
(2007)