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
Jordan C. J. D'Silva, Simon P. Driver, Claudia D. P. Lagos, Aaron S. G. Robotham, Sabine Bellstedt, Luke J. M. Davies, Jessica E. Thorne, Joss Bland-Hawthorn, Matias Bravo, Benne Holwerda, Steven Phillipps, Nick Seymour, Malgorzata Siudek, Rogier A. Windhorst
Summary: Based on the data from GAMA and DEVILS, we calculated the cosmic star formation rate and active galactic nuclei bolometric luminosity history over the past 12.5 billion years. The results show that both the star formation rate and AGN activity have evolved in a similar pattern, reaching a peak at around 10 billion years ago and declining since then. The most significant finding is that the ratio of AGN activity to star formation rate has remained constant for the past 11 billion years, indicating a synchronized evolution. This suggests a common cause, possibly gas inflow, for the stellar mass contribution and activity in galaxies over this time period.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2023)
Article
Astronomy & Astrophysics
Joanna M. Piotrowska, Asa F. L. Bluck, Roberto Maiolino, Yingjie Peng
Summary: This paper investigates how massive central galaxies cease their star formation by comparing theoretical predictions with observations. The study finds that supermassive black hole mass is the most predictive parameter for determining whether a galaxy is star forming or quenched, and that the integrated power output of the AGN is a key factor in causing galaxies to quench.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2022)
Article
Astronomy & Astrophysics
V Kalinova, D. Colombo, S. F. Sanchez, K. Kodaira, R. Garcia-Benito, R. Gonzalez Delgado, E. Rosolowsky, E. A. D. Lacerda
Summary: This study proposes a classification method based on mechanisms of star-forming quenching to better understand galaxy evolution. By analyzing maps of ionised hydrogen distribution and nuclear activity of galaxies, they categorize galaxies into different quenching stages and find that galaxies in different stages occupy specific locations on the star-formation-rate versus stellar mass diagram.
ASTRONOMY & ASTROPHYSICS
(2021)
Article
Astronomy & Astrophysics
M. B. Stone, D. Bettoni, R. Falomo, J. K. Kotilainen, K. Karhunen, S. Paiano, R. Scarpa
Summary: This study presents optical spectroscopy of the close companions of 22 low-redshift QSOs, revealing that about half of them have at least one associated galaxy, with most showing signs of recent star formation at modest rates. The results suggest that quasars do not have a strong influence on the star formation of their companion galaxies.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2021)
Article
Astronomy & Astrophysics
Siddhant Pinjarkar, Martin J. Hardcastle, Jeremy J. Harwood, Dharam Lal, Peter W. Hatfield, Matt J. Jarvis, Zara Randriamanakoto, Imogen H. Whittam
Summary: In this study, we analyzed the best-fitting spectral age distribution of 28 radio galaxies from the MIGHTEE survey. The results showed that the maximum age of these sources ranges from 2.8 to 115 Myr, with a median of 8.71 Myr. These observations are important for evaluating the age and power of radio sources, as well as their impact on the surrounding environment.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2023)
Article
Astronomy & Astrophysics
F. R. Donnan, D. Rigopoulou, I. Garcia-Bernete, M. Pereira-Santaella, A. Alonso-Herrero, P. F. Roche, S. Aalto, A. Hernan-Caballero, H. W. W. Spoon
Summary: This study investigates the properties of compact obscured nuclei (CONs) in the mid-infrared and explores techniques for identifying these objects. The results show a strong correlation between the nuclear optical depth and HCN-vib emission line in CONs. The efficacy of using PAH equivalent width ratios to select CONs is reduced when there is a strong star-forming component from the host galaxy.
ASTRONOMY & ASTROPHYSICS
(2023)
Article
Astronomy & Astrophysics
R. Schiavi, R. Capuzzo-Dolcetta, I. Y. Georgiev, M. Arca-Sedda, A. Mastrobuono-Battisti
Summary: Using direct N-body simulations, this study explores the future evolution scenarios of two massive clusters observed towards the centre of the spiral galaxy NGC4654. The simulations show that the clusters will inevitably merge, possibly forming a massive nuclear star cluster in the galaxy center. These results emphasize the dynamics of the galactic central zone and provide a unique perspective on studying these massive clusters.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2021)
Article
Astronomy & Astrophysics
M. Pereira-Santaella, L. Colina, S. Garcia-Burillo, I Lamperti, E. Gonzalez-Alfonso, M. Perna, S. Arribas, A. Alonso-Herrero, S. Aalto, F. Combes, A. Labiano, J. Piqueras-Lopez, D. Rigopoulou, P. van der Werf
Summary: The study reveals a correlation between the sizes and densities of the continuum and CO molecular gas in ultra-luminous infrared systems, suggesting the presence of obscured active galactic nuclei. Furthermore, in interacting systems, activity may be concentrated in smaller regions in early stages and become more extended in later stages of mergers.
ASTRONOMY & ASTROPHYSICS
(2021)
Article
Astronomy & Astrophysics
Emilio Zanatta, Ruben Sanchez-Janssen, Ana L. Chies-Santos, Rafael S. de Souza, John P. Blakeslee
Summary: The study conducted in the core of the Coma Cluster reveals that the rate at which the probability of nuclear star cluster (NSC) formation varies with galaxy luminosity is nearly universal, while the fraction of nucleated galaxies at fixed luminosity does exhibit an environmental dependence. More massive environments feature higher nucleation fractions, indicating a clear secondary dependence on the environment.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2021)
Article
Astronomy & Astrophysics
G. Speranza, B. Balmaverde, A. Capetti, F. Massaro, G. Tremblay, A. Marconi, G. Venturi, M. Chiaberge, R. D. Baldi, S. Baum, P. Grandi, E. T. Meyer, C. O'Dea, W. Sparks, B. A. Terrazas, E. Torresi
Summary: This study analyzed VLT/MUSE observations of 37 radio galaxies from the Third Cambridge catalogue (3C) with redshift < 0.3 to search for nuclear outflows of ionized gas. Evidence of nuclear outflows was found in 21 sources, with velocities between 400 and 1000 km/s, while extended outflows were found in 13 sources. The outflows, likely radiatively powered, have limited effects on the gas content or star formation in the host galaxies.
ASTRONOMY & ASTROPHYSICS
(2021)
Article
Astronomy & Astrophysics
Luiz A. Silva-Lima, Lucimara P. Martins, Paula R. T. Coelho, Dimitri A. Gadotti
Summary: This study explores the relationship between barred galaxies and active galactic nuclei (AGN) using a sample from SDSS. The results show that AGN are more commonly found in barred galaxies with higher accretion rates. However, there is no correlation between activity level and bar strength. These findings support theoretical predictions and suggest the presence of other mechanisms at smaller scales.
ASTRONOMY & ASTROPHYSICS
(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
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
A. Capetti, B. Balmaverde, C. Tadhunter, A. Marconi, G. Venturi, M. Chiaberge, R. D. Baldi, S. Baum, R. Gilli, P. Grandi, E. T. Meyer, G. Miley, C. O'Dea, W. Sparks, E. Torresi, G. Tremblay
Summary: Observations using the VLT/MUSE optical integral field spectrograph were conducted on the radio source 3C 277.3, which is associated with the galaxy Coma A and has a redshift of 0.085. A emission line region was found to completely surround the double-lobed radio source, with a size of approximately 60 kpc x 90 kpc. Based on emission line ratios, five compact knots were identified where the gas ionization is powered by young stars located as far as about 60 kpc from the host. The emission line filaments surrounding the radio emission are likely ionized by fast shocks, but star formation at the edges of the radio source may also contribute.
ASTRONOMY & ASTROPHYSICS
(2022)