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
R. Porter-Temple, B. W. Holwerda, A. M. Hopkins, L. E. Porter, C. Henry, T. Geron, B. Simmons, K. Masters, S. Kruk
Summary: Understanding the effect of spiral structure on the star formation properties of galaxies is crucial for a comprehensive understanding of spiral structure evolution. This study investigates the relationship between the number of spiral arms and various star formation indicators using the Galaxy And Mass Assembly (GAMA) survey and citizen science visual classifications. The findings reveal that galaxies with fewer spiral arms tend to have lower stellar masses and higher specific star formation rates (sSFR), while galaxies with more spiral arms have higher stellar masses and lower sSFRs, suggesting that the efficiency of star formation decreases with an increase in the number of spiral arms.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2022)
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
Stacey Alberts, Kyoung-Soo Lee, Alexandra Pope, Mark Brodwin, Yi-Kuan Chiang, Jed McKinney, Rui Xue, Yun Huang, Michael Brown, Arjun Dey, Peter R. M. Eisenhardt, Buell T. Jannuzi, Roxana Popescu, Vandana Ramakrishnan, Spencer A. Stanford, Benjamin J. Weiner
Summary: Massive galaxy clusters show strong evolution from high redshift to low redshift, with differences in dust-obscured star formation and stellar mass growth. Data in the near- to far-infrared directly trace this evolution, revealing the total cluster emission including low-mass members. The majority of cluster far-IR emission comes from low-mass constituents, indicating a possible combination of mass-dependent quenching and excess dust in these galaxies.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2021)
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
Maria Lomaeva, Ilse De Looze, Amelie Saintonge, Marjorie Decleir
Summary: Understanding galaxy evolution relies on studying star formation histories (SFHs). By comparing star formation rates (SFRs) calculated using different tracers, we can study recent SFHs. This study aims to calibrate a proxy for the present-day rate of change in SFR without the need for full spectral energy distribution modeling. The authors propose an SFR change diagnostic and apply it to a nearby spiral galaxy, finding that the star formation activity has declined recently but is still active in the spiral arms. The result suggests that the SFR change diagnostic is sensitive to molecular gas content, spiral arm structure, and disc pressure.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2022)
Article
Astronomy & Astrophysics
Eunbin Kim, Ho Seong Hwang, Woong-Seob Jeong, Seong Jin Kim, Denis Burgarella, Tomotsugu Goto, Tetsuya Hashimoto, Young-Soo Jo, Jong Chul Lee, Matthew Malkan, Chris Pearson, Hyunjin Shim, Yoshiki Toba, Simon C-C Ho, Daryl Joe Santos, Hiroyuki Ikeda, Helen K. Kim, Takamitsu Miyaji, Hideo Matsuhara, Nagisa Oi, Toshinobu Takagi, Ting-Wen Wang
Summary: The study reveals that the merger fractions of galaxies increase with redshift, with the merger fractions of starbursts higher than those of main-sequence and quiescent galaxies in all redshift bins. Herschel-detected galaxies have higher merger fraction compared to non-Herschel-detected galaxies, and both types show clearly different merger fractions depending on the star formation modes.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2021)
Article
Astronomy & Astrophysics
Polychronis Papaderos, Iris Breda, Andrew Humphrey, Jean Michel Gomes, Bodo L. Ziegler, Cirino Pappalardo
Summary: Our understanding of the photometric and structural properties of bulges in late-type galaxies is based on image decomposition and modeling, but the conventional exponential model neglects the effect of star formation quenching in the centers of these galaxies. This leads to an underestimation of the true luminosity of the bulge and impacts its structural characterization and color gradients.
ASTRONOMY & ASTROPHYSICS
(2022)
Article
Astronomy & Astrophysics
G. Orellana-Gonzalez, P. Cerulo, G. Covone, C. Cheng, R. Leiton, R. Demarco, M-L Gendron-Marsolais
Summary: In this study, we investigated the star-formation activity in a sample of approximately 56,000 brightest cluster galaxies (BCGs) using optical and infra-red data. We found that star-forming BCGs are more abundant and have higher star-formation rates (SFR) at higher redshifts compared to lower redshifts. We also observed variations in the fraction of star-forming BCGs depending on BCG stellar mass and cluster halo mass. Additionally, our results suggest a correlation between star formation and the cooling of the intracluster medium.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2022)
Article
Astronomy & Astrophysics
V. M. Sampaio, R. R. de Carvalho, I Ferreras, A. Aragon-Salamanca, L. C. Parker
Summary: The study compared properties of galaxies in clusters and in the field, finding that galaxies in the field hosted star formation events in the red sequence more recently than those in cluster environments. Additionally, the study showed that morphology rapidly changes after reaching the green valley region, while the star formation rate keeps decreasing.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2022)
Article
Astronomy & Astrophysics
Sophia K. Stuber, Eva Schinnerer, Thomas G. Williams, Miguel Querejeta, Sharon Meidt, Eric Emsellem, Ashley Barnes, Ralf S. Klessen, Adam K. Leroy, Justus Neumann, Mattia C. Sormani, Frank Bigiel, Melanie Chevance, Danny Dale, Christopher Faesi, Simon C. O. Glover, Kathryn Grasha, J. M. Diederik Kruijssen, Daizhong Liu, Hsi-an Pan, Jerome Pety, Francesca Pinna, Toshiki Saito, Antonio Usero, Elizabeth J. Watkins
Summary: In this work, the molecular gas distribution of a large sample of nearby main sequence galaxies was visually classified to study their morphology. The classification scheme included different types of bars, spiral arms, and rings, and introduced bar lane classes. The study found that the cold gas-based morphologies matched well with the ones based on stellar light, and that higher mass galaxies were more likely to have bars and grand-design spiral arms. The presence of central or nuclear rings was also observed, especially in barred galaxies.
ASTRONOMY & ASTROPHYSICS
(2023)
Article
Astronomy & Astrophysics
B. C. Lemaux, O. Cucciati, O. Le Fevre, G. Zamorani, L. M. Lubin, N. Hathi, O. Ilbert, D. Pelliccia, R. Amorin, S. Bardelli, P. Cassata, R. R. Gal, B. Garilli, L. Guaita, M. Giavalisco, D. Hung, A. Koekemoer, D. Maccagni, L. Pentericci, B. Ribeiro, D. Schaerer, E. Shah, L. Shen, P. Staab, M. Talia, R. Thomas, A. R. Tomczak, L. Tresse, E. Vanzella, D. Vergani, E. Zucca
Summary: Using spectroscopic observations and publicly available data, this study investigates the relationship between the star-formation rate (SFR) and the local environment of galaxies in the early universe. The findings reveal that there is a definite and nearly monotonic increase in the average SFR with increasing galaxy overdensity, driven primarily by the increase in more massive and higher star-forming galaxies in high-density environments. Even after accounting for stellar mass effects, a weak but significant SFR-galaxy overdensity trend remains, suggesting additional environmentally related processes at play. The study also finds evidence of increasing SFR with increasing redshift in the densest environments, indicating the formation of red sequences in clusters at lower redshifts.
ASTRONOMY & ASTROPHYSICS
(2022)
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
Robert C. Kennicutt, Mithi A. C. De Los Reyes
Summary: We found that the Schmidt law between starburst and nonstarburst galaxies can be fitted with a single power law with a slope of n = 1.5 +/- 0.05. However, fitting separate power laws for nonstarburst and starburst galaxies produces significantly different slopes, with a pronounced offset in the zero-point of the starburst relation towards higher SFR surface densities.
ASTROPHYSICAL JOURNAL
(2021)
Article
Astronomy & Astrophysics
Jian Ren, Zhizheng Pan, X. Z. Zheng, Jianbo Qin, D. D. Shi, Valentino Gonzalez, Fuyan Bian, Jia-Sheng Huang, Min Fang, Wenhao Liu, Run Wen, Yuheng Zhang, Man Qiao, Shuang Liu
Summary: The gas supply from the cosmic web is crucial for star formation in galaxies. This study examines the impact of the cosmic large-scale structure (LSS) on galaxy evolution in a specific local environment. The results show that star-forming galaxies in the LSS maintain the same level of star formation as those in the general field, regardless of local density but dependent on stellar mass. In contrast, an increasing number of quiescent galaxies are observed at higher local densities, supporting the idea that galaxy mass and local dense environment play a role in quenching star formation.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2022)