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
K. Fahrion, M. Lyubenova, G. van de Ven, M. Hilker, R. Leaman, J. Falcon-Barroso, A. Bittner, L. Coccato, E. M. Corsini, D. A. Gadotti, E. Iodice, R. M. McDermid, I. Martin-Navarro, F. Pinna, A. Poci, M. Sarzi, P. T. de Zeeuw, L. Zhu
Summary: Nuclear star clusters (NSCs) are the densest stellar systems in the Universe and are thought to form via mergers of star clusters or in situ star formation at galaxy centers. Research shows that NSCs in low-mass galaxies are more metal-poor than their hosts, while NSCs in massive galaxies exhibit diverse star formation histories. There is a clear transition in the dominant formation channel of NSCs with both galaxy and NSC mass.
ASTRONOMY & ASTROPHYSICS
(2021)
Article
Astronomy & Astrophysics
C. Maier, C. P. Haines, B. L. Ziegler
Summary: The study aims to explore differences in properties and quenching processes of satellite galaxies in clusters with passive and star-forming brightest cluster galaxies. Results indicate a significant metallicity enhancement among lower-mass satellite galaxies in clusters with passive BCGs, highlighting the concept of galactic conformity. Additionally, there is evidence of rapid quenching of star formation in surviving massive satellite galaxies around passive BCGs due to AGN activity.
ASTRONOMY & ASTROPHYSICS
(2022)
Article
Astronomy & Astrophysics
Laura Scholz-Diaz, Jorge Sanchez Almeida, Claudio Dalla Vecchia
Summary: Theory predicts that cosmological gas accretion fuels star formation in galaxies, and using advanced simulations, researchers have identified chemical inhomogeneities resulting from the accretion process. Low metallicity regions are associated with enhanced star formation, and the origin of gas for star formation varies at different redshifts. The accreted gas may come from mergers, unbound gas, and mergers with dark galaxies, with different contributions based on stellar mass.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2021)
Article
Astronomy & Astrophysics
Hyunjin Jeong, Kyuseok Oh, Seok-Joo Joo, Sukyoung K. Yi
Summary: Based on GALEX UV data and SUSS data, a study characterized the stellar population properties of luminous early-type galaxies, finding that 7.7% of the sample galaxies exhibit recent star formation and tend to be more metal-poor, possibly due to external processes such as mergers or interactions driving the observed star formation activity.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2022)
Article
Astronomy & Astrophysics
Giacomo Riva, Simona Ghizzardi, Silvano Molendi, Iacopo Bartalucci, Sabrina De Grandi, Fabio Gastaldello, Claudio Grillo, Mariachiara Rossetti
Summary: This study investigates the systematics in iron abundance measurements in intermediate-mass galaxy clusters. It finds that the modelling of the L-line complex poses challenges, but the impact of the systematics on the measurements is relatively small.
ASTRONOMY & ASTROPHYSICS
(2022)
Article
Astronomy & Astrophysics
S. Gillman, A. Puglisi, U. Dudzeviciute, A. M. Swinbank, A. L. Tiley, C. M. Harrison, J. Molina, R. M. Sharples, R. G. Bower, M. Cirasuolo, Edo Ibar, D. Obreschkow
Summary: Using data from the KMOS Ultra-deep Rotational Velocity Survey, the study analyzes the emission line ratios and metallicity of 22 main-sequence galaxies at a redshift of approximately 1.5. The results confirm the presence of a stellar mass-gas-phase metallicity relation and a decrease in gas-phase metallicity with increasing stellar mass compared to local main-sequence galaxies. The study also reveals the spatial variations in the metallicity gradient within the galaxies and a negative correlation between gas-phase metallicity and galaxy integrated star-formation rate surface density.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2022)
Article
Astronomy & Astrophysics
Katja Fahrion, Teodora-Elena Bulichi, Michael Hilker, Ryan Leaman, Mariya Lyubenova, Oliver Muller, Nadine Neumayer, Francesca Pinna, Marina Rejkuba, Glenn van de Ven
Summary: Nuclear star clusters (NSCs) formation depends on the mass of the galaxies. Low-mass NSCs predominantly form from the merger of globular clusters (GCs) in dwarf galaxies, while high-mass NSCs in massive galaxies assemble through central enriched star formation. Spectral analysis of nine nucleated late-type dwarf galaxies shows that NSCs in low-mass galaxies mainly grow through the inspiral of GCs, while central star formation can contribute to NSC growth in more massive galaxies.
ASTRONOMY & ASTROPHYSICS
(2022)
Article
Astronomy & Astrophysics
Min Bao, Yanmei Chen, Qirong Yuan, Yong Shi, Dmitry Bizyaev, Xiaoling Yu, Shuai Feng, Xiao Cao, Yulong Gao, Qiusheng Gu, Ying Yu
Summary: Using integral field unit (IFU) data from the MaNGA survey, we studied 36 star-forming galaxies with galactic-scale outflows in ionized gas phase and found that these galaxies are smaller, have more asymmetric gas discs, more active star formation in the center, and older stellar populations compared to the control sample. Additionally, we observed that star formation in these galaxies can be divided into two branches, with one following an inside-out formation scenario and the other being triggered by gas accretion or galaxy interaction in the galactic center to further drive the outflows. Enhanced star formation and metallicity along the minor axis of these galaxies indicate positive feedback and metal entrainment in the galactic-scale outflows.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2021)
Article
Astronomy & Astrophysics
Rose A. Finn, Benedetta Vulcani, Gregory Rudnick, Michael L. Balogh, Vandana Desai, Pascale Jablonka, Dennis Zaritsky
Summary: We investigate the role of dense environments in suppressing star formation by studying galaxies with log(10)(M- * / M-?) > 9.7 in nine clusters from the Local Cluster Survey. We find that SFR suppression increases with increasing bulge-to-total ratio in all environments. In addition, cluster and infall galaxies have more suppressed SFRs compared to field counterparts at all values of B/T, suggesting an additional mechanism in dense environments.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2023)
Article
Astronomy & Astrophysics
K. George, B. M. Poggianti, N. Tomicic, J. Postma, P. Cote, J. Fritz, S. K. Ghosh, M. Gullieuszik, J. B. Hutchings, A. Moretti, A. Omizzolo, M. Radovich, P. Sreekumar, A. Subramaniam, S. N. Tandon, B. Vulcani
Summary: Spiral galaxies experience strong ram-pressure effects when entering galaxy clusters, resulting in gas stripping and the formation of extended tails with jellyfish-like appearance. Ultraviolet observations of jellyfish galaxies JW39, JO60, and JO194 reveal star formation knots in the disc and tails, with strong correlation between their UV and H alpha flux. Optical emission line ratio maps identify emission mechanisms (star formation, LINER, or mix) in different regions, with star-forming regions matching regions with significant UV flux.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2023)
Article
Astronomy & Astrophysics
Xi Meng, Oleg Y. Gnedin
Summary: We investigated the evolution of tidal fields experienced by massive star clusters in Milky Way-sized galaxies using cosmological simulations. We found that the tidal force on clusters is strongest in the first few hundred million years after formation, after which it plateaus at a lower value. The fraction of time spent by clusters in high tidal strength regions decreases with age. In situ and ex situ clusters experience similar tidal fields at early ages, but in situ clusters generally experience stronger tidal fields at older ages due to their lower orbits. This difference in tidal fields affects the survival of clusters, with ex situ clusters typically having a higher bound fraction than in situ clusters.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2022)
Article
Astronomy & Astrophysics
James W. Johnson, Charlie Conroy, Benjamin D. Johnson, Annika H. G. Peter, Phillip A. Cargile, Ana Bonaca, Rohan P. Naidu, Turner Woody, Yuan-Sen Ting, Jiwon Jesse Han, Joshua S. Speagle
Summary: We have modeled the stellar abundances and ages of two disrupted dwarf galaxies in the Milky Way stellar halo and found similarities with other galaxies in terms of stellar mass and chemical evolution. Our fitting method is accurate and applicable to any one-zone model.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2023)
Article
Astronomy & Astrophysics
Jordan A. Turner, Daniel A. Dale, James Lilly, Mederic Boquien, Sinan Deger, Janice C. Lee, Bradley C. Whitmore, Gagandeep S. Anand, Samantha M. Benincasa, Frank Bigiel, Guillermo A. Blanc, Melanie Chevance, Eric Emsellem, Christopher M. Faesi, Simon C. O. Glover, Kathryn Grasha, Annie Hughes, Ralf S. Klessen, Kathryn Kreckel, J. M. Diederik Kruijssen, Adam K. Leroy, Hsi-An Pan, Erik Rosolowsky, Andreas Schruba, Thomas G. Williams
Summary: The study reveals that after 4-6 million years, star clusters are no longer associated with any gas clouds. Moreover, the autocorrelation and cross-correlation of star clusters and GMCs are measured to quantify the fractal nature of hierarchical star formation. Young star clusters (<=10 million years) show stronger autocorrelation on kpc and smaller spatial scales compared to the >10 million-year-old stellar populations, indicating the dissolution of the hierarchical structure over time.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2022)
Article
Astronomy & Astrophysics
Martyna Chruslinska, Gijs Nelemans, Lumen Boco, Andrea Lapi
Summary: The paper focuses on the distribution of star formation at low metallicity, discussing factors such as the method used to describe the metallicity distribution, the contribution of starburst galaxies, and the slope of the mass metallicity relation. There is uncertainty in the low metallicity part of the distribution even at low redshifts.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2021)
Article
Astronomy & Astrophysics
S. Torres-Flores, P. Amram, D. Olave-Rojas, N. Munoz-Elgueta, C. Mendes de Oliveira, D. de Mello, F. Urrutia-Viscarra
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2020)
Article
Astronomy & Astrophysics
Michael L. Palumbo, Sheila J. Kannappan, Elaine M. Frazer, Kathleen D. Eckert, Dara J. Norman, Luciano Fraga, Bruno C. Quint, Philippe Amram, Claudia Mendes de Oliveira, Ashley S. Bittner, Amanda J. Moffett, David Stark, Mark A. Norris, Nathaniel T. Cleaves, Derrick S. Carr
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2020)
Article
Astronomy & Astrophysics
Marcelo C. Vicentin, Pablo Araya-Araya, Laerte Sodre Jr, Roderik Overzier, Eleazar R. Carrasco, Hector Cuevas
Summary: An analysis of the environment of six QSO triplets at 1 less than or similar to z less than or similar to 1.5 was conducted using photometric redshifts and density field analysis, revealing no significant evidence of association with dense structures such as massive galaxy clusters or protoclusters.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2021)
Article
Astronomy & Astrophysics
Eleazar R. Carrasco, Tomas Verdugo, Veronica Motta, Gael Foex, E. Ellingson, Percy L. Gomez, Emilio Falco, Marceau Limousin
Summary: The optical study of the galaxy cluster MS 0440.5+0204 reveals new spectroscopic redshifts and multiple substructures within the cluster, indicating a dynamically active cluster with ongoing mergers and accretion of nearby groups.
ASTROPHYSICAL JOURNAL
(2021)
Article
Astronomy & Astrophysics
Dacheng Lin, Olivier Godet, Natalie A. Webb, Didier Barret, Jimmy A. Irwin, S. Komossa, Enrico Ramirez-Ruiz, W. Peter Maksym, Dirk Grupe, Eleazar R. Carrasco
Summary: A prolonged outburst of an X-ray source was studied, and it was found that the source exhibited a dramatic spectral softening over several years. The softening could indicate a transition from super-Eddington to thermal state or the presence of a warm absorber. Further observations confirmed that the source remained in a super-soft state for over 5 years, suggesting a super-Eddington to thermal spectral state transition. The updated modeling of the event suggested the disruption of a 0.75 solar mass star by a massive black hole.
ASTROPHYSICAL JOURNAL LETTERS
(2022)
Article
Astronomy & Astrophysics
Renato A. Dupke, Yolanda Jimenez-Teja, Yuanyuan Su, Eleazar R. Carrasco, Anton M. Koekemoer, Rebeca M. Batalha, Lucas Johnson, Jimmy Irwin, Eric MIller, Paola Dimauro, Nicolas O. L. de Oliveira, Jose Vilchez
Summary: Fossil groups are older galaxy systems with high velocity dispersions and corresponding ICM temperatures. However, they usually lack well-developed cool cores. In our analysis of a classic fossil group, we find that it is in a very relaxed dynamical state and the ICLf analysis can be used as an independent tool to assess the relative age of fossil groups.
ASTROPHYSICAL JOURNAL
(2022)
Article
Astronomy & Astrophysics
Mirko Simunovic, Thomas H. H. Puzia, Bryan Miller, Eleazar R. R. Carrasco, Aaron Dotter, Santi Cassisi, Stephanie Monty, Peter Stetson
Summary: This study presents a photometric analysis of globular cluster 47 Tuc (NGC 104) using near-IR imaging data. The analysis combines near-IR photometry from the GeMS/ GSAOI Galactic Globular Cluster Survey with optical photometry from the Hubble Space Telescope, resulting in a high-quality color-magnitude diagram. Bayesian analysis using the BASE-9 software provides probability distributions and precise estimates for the cluster's age, distance, and extinction parameters. The estimated age of 47 Tuc is 12.42(-0.05)(+0.05)+/- 0.08 Gyr, and the true distance modulus is (m-M)0= 13.250-(+ 0.003)(-0.003) +/- 0.028 mag, consistent with previous studies.
ASTROPHYSICAL JOURNAL
(2023)
Article
Multidisciplinary Sciences
Arianna Cortesi, Kanak Saha, Fabricio Ferrari, Geferson Lucatelli, Claudia M. De Oliveira, Suraj Dhiwar, Clecio R. Bom, Luciana Olivia Dias
Summary: The collaborative Brazilian-Indian project investigates the structural properties of Lenticular galaxies in the Stripe 82 using a combination of S-PLUS and SDSS data. The study combines BPZ and MFMTK techniques to explore the correlation between galaxies shapes and their stellar contents, providing new insights into nearby universe.
ANAIS DA ACADEMIA BRASILEIRA DE CIENCIAS
(2021)
Article
Astronomy & Astrophysics
Ciria Lima-Dias, Antonela Monachesi, Sergio Torres-Flores, Arianna Cortesi, Daniel Hernandez-Lang, Carlos Eduardo Barbosa, Claudia Mendes de Oliveira, Daniela Olave-Rojas, Diego Pallero, Laura Sampedro, Alberto Molino, Fabio R. Herpich, Yara L. Jaffe, Ricardo Amorin, Ana L. Chies-Santos, Paola Dimauro, Eduardo Telles, Paulo A. A. Lopes, Alvaro Alvarez-Candal, Fabricio Ferrari, Antonio Kanaan, Tiago Ribeiro, William Schoenell
Summary: The study of Hydra cluster galaxies shows that about 88% of the galaxies are quenched, with possible substructures within the cluster. The Sersic index of galaxies varies with wavelength and galaxy type, but remains constant with respect to clustercentric distance and density.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2021)
Article
Astronomy & Astrophysics
Tomas Verdugo, Eleazar R. Carrasco, Gael Foex, Veronica Motta, Percy L. Gomez, Marceau Limousin, Juan Magana, Jose A. de Diego
ASTROPHYSICAL JOURNAL
(2020)
Article
Astronomy & Astrophysics
C. E. Barbosa, D. Zaritsky, R. Donnerstein, H. Zhang, A. Dey, C. Mendes de Oliveira, L. Sampedro, A. Molino, M. V. Costa-Duarte, P. Coelho, A. Cortesi, F. R. Herpich, J. A. Hernandez-Jimenez, T. Santos-Silva, E. Pereira, A. Werle, R. A. Overzier, R. Fernandes, A. V. Smith Castelli, T. Ribeiro, W. Schoenell, A. Kanaan
ASTROPHYSICAL JOURNAL SUPPLEMENT SERIES
(2020)