Article
Astronomy & Astrophysics
P. Sanchez-Martin, C. Garcia-Gomez, J. J. Masdemont, M. Romero-Gomez
Summary: We propose a dynamical mechanism that explains the asymmetry between the arms in some barred disc galaxies, where one arm is well defined while the other exhibits a ragged structure. By studying the invariant manifolds associated with the Lyapunov periodic orbits at the ends of the bar, we find that the dynamics are not symmetric due to the presence of an asymmetric bar or a non-centred bulge in the galaxy centre. As a result, one arm becomes weaker and more ragged compared to the other arm.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2023)
Article
Astronomy & Astrophysics
J. A. Sellwood, R. G. Carlberg
Summary: This paper continues to explore different aspects of disc galaxy simulations that support spiral instabilities. The study finds a correlation between the growth rate of the mode and its limiting amplitude, and identifies the role of non-linear orbit deflections and available time in the saturation and decay of the spiral instabilities.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2022)
Article
Astronomy & Astrophysics
Enrico M. Di Teodoro, Lorenzo Posti, Patrick M. Ogle, S. Michael Fall, Thomas Jarrett
Summary: We studied the kinematics and scaling relations of 43 giant spiral galaxies and found that most of them conform to the standards set by low-mass galaxies. It is speculated that these rare giant galaxies are scaled up versions of smaller discs, indicating that spiral galaxies exhibit self-similarity at the high-mass end.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2021)
Article
Astronomy & Astrophysics
Ewa L. Lokas
Summary: This study elucidates the causal relationship between AGN feedback and bar formation by studying the formation of barred galaxies in a major merger, and explains the correlations observed in the data.
ASTRONOMY & ASTROPHYSICS
(2022)
Article
Astronomy & Astrophysics
Kenji Bekki
Summary: We discuss the mechanism(s) of bar formation in isolated and tidally interacting disc galaxies using idealized collision-less N-body simulations. We find that a synchronization effect called apsidal precession synchronization (APS) occurs in which stars with initially different azimuthal angles and precession rates can have similar values within a few dynamical time-scales. This synchronization is caused by the enhanced tangential gravitational force. A weak seed bar is first formed through APS in local regions of the disc, and then the bar grows due to APS. Bar formation is more efficient in tidal interactions due to stronger tidal perturbations.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2023)
Article
Astronomy & Astrophysics
Cameron W. Trapp, Dusan Keres, Tsang Keung Chan, Ivanna Escala, Cameron Hummels, Philip F. Hopkins, Claude-Andre Faucher-Giguere, Norman Murray, Eliot Quataert, Andrew Wetzel
Summary: This study analyzes gas accretion in the vicinity of galaxies using the FIRE-2 cosmological zoom-in simulations. It finds that gas approaches the disc with low radial velocities and similar angular momentum to the gaseous disc edge, piling up near the edge and settling into full rotational support for star formation. The gas moves predominantly parallel to the disc and joins largely in the outskirts, with a brief period of more vertical trajectories before joining the disc. Within the disc, gas motion is complex, dominated by spiral arm induced oscillations and feedback.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2022)
Article
Astronomy & Astrophysics
J. A. Sellwood, R. H. Sanders
Summary: Recent observations suggest that the ultradiffuse galaxy AGC 114905 has a rotating disc without the need for dark matter. This is surprising because a non-dark matter Newtonian disc would be expected to be unstable. N-body simulations confirm this expectation, raising questions about the galaxy's lack or scarcity of dark matter. It is also suggested that overestimating the inclination of the system could reconcile the observed rotation curve with the presence of a massive dark matter halo.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2022)
Article
Astronomy & Astrophysics
J. A. Sellwood, Victor P. Debattista
Summary: Any misalignment between the inner and outer disc of a galaxy will lead to the excitation of a bending wave in the outer disc, driven by torque from the inner disc. This bending wave grows in amplitude over several Gyr, aligning parts of the disc with the inner disc. The mild warps observed in simulations of disc galaxies can be excited by shot noise, particularly the quadrupole component, but larger amplitude bending waves are likely caused by perturbations from halo substructure and galaxy assembly in real galaxies.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2022)
Article
Astronomy & Astrophysics
J. A. Sellwood, R. G. Carlberg
Summary: This study explores the spiral responses in a stable disc galaxy model to evenly spaced perturbing masses. It reveals that the amplitudes of the responses are proportional to the masses of the perturbations, and higher mass rings can cause non-linear changes through scattering at major resonances. The net response from two rings orbiting at differing frequencies appears as a shearing spiral, demonstrating the effects of superposition on the evolution of simulations.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2021)
Article
Astronomy & Astrophysics
N. P. H. Nesvadba, A. Y. Wagner, D. Mukherjee, A. Mandal, R. M. J. Janssen, H. Zovaro, N. Neumayer, J. Bagchi, G. Bicknell
Summary: This study uses ALMA CO(1-0) interferometry to probe the cold molecular gas in 2MASSX J23453269-044925, finding that radio sources may lower the efficiency of star formation. A small percentage of the jet kinetic energy is required to drive gas motions, preventing gas fragmentation into star-forming clouds.
ASTRONOMY & ASTROPHYSICS
(2021)
Article
Astronomy & Astrophysics
Shameer Abdeen, Benjamin L. Davis, Rafael Eufrasio, Daniel Kennefick, Julia Kennefick, Ryan Miller, Deanna Shields, Erik B. Monson, Calla Bassett, Harry O'Mara
Summary: The study examines evidence for age gradients using star formation history (SFH) maps and spatially resolved stellar clusters, finding secondary peaks in cluster distributions indicate the presence of an age gradient. Analysing SFH maps of 12 galaxies reveals a tightening of spiral arms with increasing age, with a probability of 69% +/- 25% that pitch angle values decrease with age, supporting the previous studies on the tightening of spiral patterns in galaxies.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2022)
Article
Astronomy & Astrophysics
S. Aniyan, A. A. Ponomareva, K. C. Freeman, M. Arnaboldi, O. E. Gerhard, L. Coccato, K. Kuijken, M. Merrifield
Summary: The study of NGC 6946's stellar velocity dispersion revealed two kinematically distinct populations of tracers, allowing for the derivation of the disc's surface mass density using the same dynamical population's dispersion and scale height, showing the disc to be closer to maximal.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2021)
Article
Astronomy & Astrophysics
Anastasia A. Ponomareva, Wanga Mulaudzi, Natasha Maddox, Bradley S. Frank, Matt J. Jarvis, Enrico M. Di Teodoro, Marcin Glowacki, Renee C. Kraan-Korteweg, Tom A. Oosterloo, Elizabeth A. K. Adams, Hengxing Pan, Isabella Prandoni, Sambatriniaina H. A. Rajohnson, Francesco Sinigaglia, Nathan J. Adams, Ian Heywood, Rebecca A. A. Bowler, Peter W. Hatfield, Jordan D. Collier, Srikrishna Sekhar
Summary: The study on the H I-based baryonic Tully-Fisher relation (bTFr) using a sample of 67 galaxies shows that there is no evidence of evolution over the past billion years, with all galaxies in the sample consistent with the same relation independent of redshift and rotational velocity measure.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2021)
Article
Astronomy & Astrophysics
J. A. Sellwood
Summary: The study found very mild dynamical friction between spiral disturbances and the halo in disc galaxies, with at most marginal evidence for an enhanced growth rate of spiral modes caused by a halo supporting response. The barely significant differences found justify the usual simplifying approximation of a rigid halo in studies of spiral instabilities in galaxies.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2021)
Article
Astronomy & Astrophysics
Natascha Sattler, Francesca Pinna, Nadine Neumayer, Jesus Falcon-Barroso, Marie Martig, Dimitri A. Gadotti, Glenn van de Ven, Ivan Minchev
Summary: We trace the evolution of the edge-on spiral galaxy NGC 3501 using deep integral-field spectroscopy MUSE observations. The study presents stellar kinematic and population maps, as well as the star formation history, of the galaxy. The maps reveal a young galaxy with a thicker metal-poor structure and an inner metal-rich one. Comparison of the star formation history suggests the formation of a future massive thin disc embedded in the preexisting thicker disc.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2023)
Article
Astronomy & Astrophysics
S. Varma, M. Huertas-Company, A. Pillepich, D. Nelson, V Rodriguez-Gomez, A. Dekel, S. M. Faber, P. Iglesias-Navarro, D. C. Koo, J. Primack
Summary: The study shows that in the simulation, the morphological transformation of galaxies is related to the activity of central super massive black holes (SMBHs), with low-mass galaxies experiencing rapid SMBH growth and high-mass galaxies growing more slowly. More compact massive galaxies grow their SMBHs faster and quench earlier, with SMBHs predominantly growing via gas accretion before galaxies quench.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2022)
Article
Astronomy & Astrophysics
Michael Kretschmer, Avishai Dekel, Romain Teyssier
Summary: Observed 'cold' galactic discs at high redshifts may be formed by intense accretion of co-planar, co-rotating gas via cold cosmic-web streams. These discs survive for about 5 orbital periods and are then disrupted by mergers and counter-rotating streams.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2022)
Article
Astronomy & Astrophysics
Avishai Dekel, Nir Mandelker, Frederic Bournaud, Daniel Ceverino, Yicheng Guo, Joel Primack
Summary: This study investigates the nature of giant clumps in high-z galaxies that experience violent disc instability, distinguishing between long-lived and short-lived clumps. The results show that massive clumps are long-lived and capable of migration.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2022)
Article
Astronomy & Astrophysics
Jonathan Petersson, Florent Renaud, Oscar Agertz, Avishai Dekel, Pierre-Alain Duc
Summary: Shell galaxies are a unique class of galaxies that exhibit wide concentric arcs with sharp outer edges. Recent observations suggest that they possess extreme conditions for star formation. In this study, a hydrodynamic simulation of galaxy merger and transformation into a shell galaxy is presented. The evolution of star formation activity is analyzed in terms of time and location within the system, revealing that star formation coincides with regions of high molecular gas fraction. The morphological transformation after merger stabilizes the gas and quenches star formation. The appearance of shells after merger implies that they do not host the conditions necessary for in situ star formation. These findings suggest that shell-forming mergers may play a role in the transition of blue late-type galaxies to red and dead early-types.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2022)
Article
Astronomy & Astrophysics
Dritan Kodra, Brett H. Andrews, Jeffrey A. Newman, Steven L. Finkelstein, Adriano Fontana, Nimish Hathi, Mara Salvato, Tommy Wiklind, Stijn Wuyts, Adam Broussard, Nima Chartab, Christopher Conselice, M. C. Cooper, Avishai Dekel, Mark Dickinson, Henry C. Ferguson, Eric Gawiser, Norman A. Grogin, Kartheik Iyer, Jeyhan Kartaltepe, Susan Kassin, Anton M. Koekemoer, David C. Koo, Ray A. Lucas, Kameswara Bharadwaj Mantha, Daniel H. McIntosh, Bahram Mobasher, Camilla Pacifici, Pablo G. Perez-Gonzalez, Paola Santini
Summary: We present the first comprehensive release of photometric redshifts (photo-z's) from the CANDELS team, analyzing biases and errors in the PDFs produced by six groups and correcting for them. We explore different methods of combining the PDFs, and demonstrate that the minimum f-divergence and hierarchical Bayesian methods yield the best results. The resulting photo-z point estimates show low outlier fractions for both spectroscopic and 3D Hubble Space Telescope redshifts.
ASTROPHYSICAL JOURNAL
(2023)
Article
Astronomy & Astrophysics
Jorge A. Zavala, Veronique Buat, Caitlin M. Casey, Steven L. Finkelstein, Denis Burgarella, Micaela B. Bagley, Laure Ciesla, Emanuele Daddi, Mark Dickinson, Henry C. Ferguson, Maximilien Franco, E. F. Jimenez-Andrade, Jeyhan S. Kartaltepe, Anton M. Koekemoer, Aurelien Le Bail, E. J. Murphy, Casey Papovich, Sandro Tacchella, Stephen M. Wilkins, Itziar Aretxaga, Peter Behroozi, Jaclyn B. Champagne, Adriano Fontana, Mauro Giavalisco, Andrea Grazian, Norman A. Grogin, Lisa J. Kewley, Dale D. Kocevski, Allison Kirkpatrick, Jennifer M. Lotz, Laura Pentericci, Pablo G. Perez-Gonzalez, Nor Pirzkal, Swara Ravindranath, Rachel S. Somerville, Jonathan R. Trump, Guang Yang, L. Y. Aaron Yung, Omar Almaini, Ricardo O. Amorin, Marianna Annunziatella, Pablo Arrabal Haro, Bren E. Backhaus, Guillermo Barro, Eric F. Bell, Rachana Bhatawdekar, Laura Bisigello, Fernando Buitrago, Antonello Calabro, Marco Castellano, Oscar A. Chavez Ortiz, Katherine Chworowsky, Nikko J. Cleri, Seth H. Cohen, Justin W. Cole, Kevin C. Cooke, M. C. Cooper, Asantha R. Cooray, Luca Costantin, Isabella G. Cox, Darren Croton, Romeel Dave, Alexander de la Vega, Avishai Dekel, David Elbaz, Vicente Estrada-Carpenter, Vital Fernandez, Keely D. Finkelstein, Jonathan Freundlich, Seiji Fujimoto, Angela Garcia-Argumanez, Jonathan P. Gardner, Eric Gawiser, Carlos Gomez-Guijarro, Yuchen Guo, Timothy S. Hamilton, Nimish P. Hathi, Benne W. Holwerda, Michaela Hirschmann, Marc Huertas-Company, Taylor A. Hutchison, Kartheik G. Iyer, Anne E. Jaskot, Saurabh W. Jha, Shardha Jogee, Stephanie Juneau, Intae Jung, Susan A. Kassin, Peter Kurczynski, Rebecca L. Larson, Gene C. K. Leung, Arianna S. Long, Ray A. Lucas, Benjamin Magnelli, Kameswara Bharadwaj Mantha, Jasleen Matharu, Elizabeth J. McGrath, Daniel H. McIntosh, Aubrey Medrano, Emiliano Merlin, Bahram Mobasher, Alexa M. Morales, Jeffrey A. Newman, David C. Nicholls, Viraj Pandya, Marc Rafelski, Kaila Ronayne, Caitlin Rose, Russell E. Ryan, Paola Santini, Lise-Marie Seille, Ekta A. Shah, Lu Shen, Raymond C. Simons, Gregory F. Snyder, Elizabeth R. Stanway, Amber N. Straughn, Harry Teplitz, Brittany N. Vanderhoof, Jesus Vega-Ferrero, Weichen Wang, Benjamin J. Weiner, Christopher N. A. Willmer, Stijn Wuyts
Summary: Lyman-break galaxy (LBG) candidates at z greater than or similar to 10 have been identified in James Webb Space Telescope (JWST)/NIRCam observations. However, we have found that dust-enshrouded star-forming galaxies at lower redshifts may mimic the near-infrared colors of z > 10 LBGs, potentially contaminating LBG candidate samples.
ASTROPHYSICAL JOURNAL LETTERS
(2023)
Article
Astronomy & Astrophysics
Suraj Dhiwar, Kanak Saha, Avishai Dekel, Abhishek Paswan, Divya Pandey, Arianna Cortesi, Mahadev Pandge
Summary: We studied the evolution of L-* elliptical galaxies in terms of their star formation history and environment in the colour-magnitude diagram to understand their quenching process. We selected 1109 L-* galaxies from a sample of 36,500 galaxies based on visual extraction and spectroscopic selection. Among them, 51 elliptical galaxies were selected based on their surface-brightness profile. Most of the red-sequence and green-valley L-* elliptical galaxies have either recently been quenched or are still forming stars, while the blue-cloud L-* elliptical galaxies are showing vigorous star formation. The galaxy colour is correlated with the cosmic-web environment.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2023)
Article
Astronomy & Astrophysics
Zhaozhou Li, Avishai Dekel, Nir Mandelker, Jonathan Freundlich, Thibaut L. Francois
Summary: We propose an analytic model, CuspCore II, to explain the response of dark matter haloes to central gas ejection, which can generate DM-deficient cores in dwarfs and high-z massive galaxies. The model is physically justified and provides more accurate predictions than its previous version, CuspCore I. By iteratively tracing the energy diffusion dE = dU (r), the model can reproduce the simulated DM profiles with around 10% accuracy or better.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2023)
Article
Astronomy & Astrophysics
A. Nestor Shachar, S. H. Price, N. M. Foerster Schreiber, R. Genzel, T. T. Shimizu, L. J. Tacconi, H. Ubler, A. Burkert, R. I. Davies, A. Dekel, R. Herrera-Camus, L. L. Lee, D. Liu, D. Lutz, T. Naab, R. Neri, A. Renzini, R. Saglia, K. F. Schuster, A. Sternberg, E. Wisnioski, S. Wuyts
Summary: We analyze the rotation curves of H alpha or CO in 100 massive, large, star-forming disk galaxies across the peak of cosmic galaxy star formation. The fraction of dark matter within the disk effective radius decreases with redshift, and the low dark matter fractions can be explained with a flattened or cored inner dark matter density distribution. At z similar to 2, there is a significant deficit of dark matter mass compared to expected values based on stellar-mass-halo-mass relations. Stellar or active galactic nucleus feedback and/or heating due to dynamical friction may explain the observed DM deficit at high star formation rates and in galaxies with massive bulges.
ASTROPHYSICAL JOURNAL
(2023)
Article
Astronomy & Astrophysics
Yuchen Guo, Shardha Jogee, Steven L. Finkelstein, Zilei Chen, Eden Wise, Micaela B. Bagley, Guillermo Barro, Stijn Wuyts, Dale D. Kocevski, Jeyhan S. Kartaltepe, Elizabeth J. McGrath, Henry C. Ferguson, Bahram Mobasher, Mauro Giavalisco, Ray A. Lucas, Jorge A. Zavala, Jennifer M. Lotz, Norman A. Grogin, Marc Huertas-Company, Jesus Vega-Ferrero, Nimish P. Hathi, Pablo Arrabal Haro, Mark Dickinson, Anton M. Koekemoer, Casey Papovich, Nor Pirzkal, L. Y. Aaron Yung, Bren E. Backhaus, Eric F. Bell, Antonello Calabro, Nikko J. Cleri, Rosemary T. Coogan, M. C. Cooper, Luca Costantin, Darren Croton, Kelcey Davis, Avishai Dekel, Maximilien Franco, Jonathan P. Gardner, Benne W. Holwerda, Taylor A. Hutchison, Viraj Pandya, Pablo G. Perez-Gonzalez, Swara Ravindranath, Caitlin Rose, Jonathan R. Trump, Alexander de la Vega, Weichen Wang
Summary: This study presents the first quantitative identification and characterization of stellar bars at z > 1 using JWST CEERS NIRCam images. The results reveal the early onset and persistence of stellar bars, suggesting their significant impact on galaxies over long periods of time.
ASTROPHYSICAL JOURNAL LETTERS
(2023)
Article
Astronomy & Astrophysics
Steven L. Finkelstein, Micaela B. Bagley, Henry C. Ferguson, Stephen M. Wilkins, Jeyhan S. Kartaltepe, Casey Papovich, L. Y. Aaron Yung, Pablo Arrabal Haro, Peter Behroozi, Mark Dickinson, Dale D. Kocevski, Anton M. Koekemoer, Rebecca L. Larson, Aurelien Le Bail, Alexa M. Morales, Pablo G. Perez-Gonzalez, Denis Burgarella, Romeel Dave, Michaela Hirschmann, Rachel S. Somerville, Stijn Wuyts, Volker Bromm, Caitlin M. Casey, Adriano Fontana, Seiji Fujimoto, Jonathan P. Gardner, Mauro Giavalisco, Andrea Grazian, Norman A. Grogin, Nimish P. Hathi, Taylor A. Hutchison, Saurabh W. Jha, Shardha Jogee, Lisa J. Kewley, Allison Kirkpatrick, Arianna S. Long, Jennifer M. Lotz, Laura Pentericci, Justin D. R. Pierel, Nor Pirzkal, Swara Ravindranath, Russell E. Ryan, Jonathan R. Trump, Guang Yang, Rachana Bhatawdekar, Laura Bisigello, Veronique Buat, Antonello Calabro, Marco Castellano, Nikko J. Cleri, M. C. Cooper, Darren Croton, Emanuele Daddi, Avishai Dekel, David Elbaz, Maximilien Franco, Eric Gawiser, Benne W. Holwerda, Marc Huertas-Company, Anne E. Jaskot, Gene C. K. Leung, Ray A. Lucas, Bahram Mobasher, Viraj Pandya, Sandro Tacchella, Benjamin J. Weiner, Jorge A. Zavala
Summary: We conducted an investigation into the first 500 million years of galaxy evolution using the CEERS survey. By analyzing the CEERS NIRCam imaging data, we identified a sample of 26 galaxy candidates at z similar to 9-16, suggesting that the number density of galaxies at this redshift range remains relatively constant. These findings highlight the potential of JWST to discover more ultrahigh-redshift galaxies in the future.
ASTROPHYSICAL JOURNAL LETTERS
(2023)
Article
Astronomy & Astrophysics
Pablo G. Perez-Gonzalez, Guillermo Barro, Marianna Annunziatella, Luca Costantin, Angela Garcia-Argumanez, Elizabeth J. McGrath, Rosa M. Merida, Jorge A. Zavala, Pablo Arrabal Haro, Micaela B. Bagley, Bren E. Backhaus, Peter Behroozi, Eric F. Bell, Laura Bisigello, Veronique Buat, Antonello Calabro, Caitlin M. Casey, Nikko J. Cleri, Rosemary T. Coogan, M. C. Cooper, Asantha R. Cooray, Avishai Dekel, Mark Dickinson, David Elbaz, Henry C. Ferguson, Steven L. Finkelstein, Adriano Fontana, Maximilien Franco, Jonathan P. Gardner, Mauro Giavalisco, Carlos Gomez-Guijarro, Andrea Grazian, Norman A. Grogin, Yuchen Guo, Marc Huertas-Company, Shardha Jogee, Jeyhan S. Kartaltepe, Lisa J. Kewley, Allison Kirkpatrick, Dale D. Kocevski, Anton M. Koekemoer, Arianna S. Long, Jennifer M. Lotz, Ray A. Lucas, Casey Papovich, Nor Pirzkal, Swara Ravindranath, Rachel S. Somerville, Sandro Tacchella, Jonathan R. Trump, Weichen Wang, Stephen M. Wilkins, Stijn Wuyts, Guang Yang, L. Y. Aaron Yung
Summary: The new capabilities of JWST have allowed for unprecedented investigations into the nature of faint optical/near-IR sources and bright mid-IR sources, including HST-dark galaxies. By analyzing spatially resolved optical-to-mid-IR spectral energy distributions, we estimated two-dimensional photometric redshifts and pixel-by-pixel stellar population properties for red galaxies detected by NIRCam. Our findings reveal that 71% of the selected galaxies are dusty star-forming galaxies at redshifts between 2 and 6, while 18% are quiescent/dormant galaxies at redshifts between 3 and 5 and have undergone significant mass assembly.
ASTROPHYSICAL JOURNAL LETTERS
(2023)
Article
Astronomy & Astrophysics
Daniel Ceverino, Nir Mandelker, Gregory F. Snyder, Sharon Lapiner, Avishai Dekel, Joel Primack, Omri Ginzburg, Sean Larkin
Summary: The evolution of star-forming galaxies at high redshifts is significantly affected by the strength and nature of stellar feedback. This study compares the effects of two different feedback models using cosmological simulations. The models with stronger feedback show a reduction in stellar mass and a better agreement with abundance matching results. Additionally, low-mass galaxies in both models have an elongated shape. However, the presence of old, quenched clumps is absent in the model with strong feedback. On the other hand, giant star-forming clumps can survive for several disc dynamical times under both feedback models.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2023)
Article
Astronomy & Astrophysics
Avishai Dekel, Offek Tziperman, Kartick C. Sarkar, Omri Ginzburg, Nir Mandelker, Daniel Ceverino, Joel Primack
Summary: We investigate the survival of giant clumps in high-redshift disc galaxies using analytic modeling and simulations. We establish a criterion for clump survival based on a survivability parameter S, which takes into account the energy sources and losses. We find that long-lived (L) clumps with certain characteristics are favored in galaxies with specific properties, while short-lived (S) clumps behave differently. A subtype of L clumps (LS) may explain the formation of globular clusters, and more massive L clumps (LL) exhibit a roughly constant star-formation rate over an extended period of time.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2023)
Article
Astronomy & Astrophysics
Sharon Lapiner, Avishai Dekel, Jonathan Freundlich, Omri Ginzburg, Fangzhou Jiang, Michael Kretschmer, Sandro Tacchella, Daniel Ceverino, Joel Primack
Summary: We find that high-redshift galaxies undergo a 'wet compaction' event near a 'golden' stellar mass of 10^(10) M-circle dot. This event involves a gaseous shrinkage phase called a 'blue nugget' (BN), followed by a central quenching of star formation leading to the formation of a compact passive stellar bulge known as a 'red nugget' (RN) and the growth of an extended gaseous disc and ring. These 'nuggets' are observed in the universe at cosmic noon and are related to early-type galaxies. The compaction process is triggered by a loss of angular momentum, caused by wet mergers, counter-rotating cold streams, or violent disc instability.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2023)