Article
Astronomy & Astrophysics
T. C. Scott, L. Cortese, P. Lagos, E. Brinks, A. Finoguenov, L. Coccato
Summary: This article presents various observations of the FGC 1287 triplet, including H i and radio continuum, narrow-band H alpha imaging, IFU spectroscopy, and X-ray observations. The observations show typical signatures of ram pressure stripping (RPS) in FGC 1287, but no X-ray emission from the intracluster medium (ICM) or intragroup medium (IGM) is detected. The analysis suggests different scenarios but none of them can fully explain the origin of the long H i tail.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2022)
Article
Astronomy & Astrophysics
Pavel Jachym, Ming Sun, Masafumi Yagi, Chong Ge, Rongxin Luo, Francoise Combes, Anezka Kabatova, Jeffrey D. P. Kenney, Tom C. Scott, Elias Brinks
Summary: We report the detection of CO emission in a newly discovered isolated gas cloud in the nearby galaxy cluster Abell 1367. The cloud is located at a projected distance of > 80 kpc from any galaxy and is the first known isolated intra-cluster cloud detected in X-ray, H alpha, and CO emission. We found a total of about 2.2 x 10(8) solar masses of H-2 in the cloud, which is offset in velocity from the underlying H alpha emission by > 100 km/s in the region where the X-ray peaks. The presence of different gas phases suggests gas phase mixing with the surrounding intra-cluster medium.
ASTRONOMY & ASTROPHYSICS
(2022)
Article
Astronomy & Astrophysics
Boris Deshev, Rhys Taylor, Robert Minchin, Tom C. Scott, Elias Brinks
Summary: This study presents an H I census of the merging cluster Abell 1367 and its surroundings, using the blind Arecibo Galaxy Environment Survey (AGES). The results show that the distribution of H I in galaxies is correlated with the local galaxy density, independent of the global environment.
ASTRONOMY & ASTROPHYSICS
(2022)
Article
Astronomy & Astrophysics
Nicolas O. L. de Oliveira, Yolanda Jimenez-Teja, Renato Dupke
Summary: In this study, we analysed the contribution of intracluster light (ICL) to the total luminosity of two massive galaxy clusters observed by the Hubble Space Telescope. We developed an algorithm called CICLE to separate the ICL from the light of galaxies and measure the ICL fraction. The results showed that the ICL fraction varied between 7-25% for Abell 370 and 3-22% for Abell S1063, consistent with theoretical predictions. We also found an enhanced ICL fraction in the intermediate filter F606W, indicating the presence of younger/lower metallicity stars in the ICL compared to the cluster galaxies. Based on these findings, we concluded that both Abell 370 and Abell S1063 are merging systems.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2022)
Article
Astronomy & Astrophysics
Nikki Zabel, Timothy A. Davis, Matthew W. L. Smith, Marc Sarzi, Alessandro Loni, Paolo Serra, Maritza A. Lara-Lopez, Phil Cigan, Maarten Baes, George J. Bendo, Ilse De Looze, Enrichetta Iodice, Dane Kleiner, Barbel S. Koribalski, Reynier Peletier, Francesca Pinna, P. Tim de Zeeuw
Summary: Observations from various telescopes were used to study gas-to-dust ratios in Fornax cluster galaxies, showing that these ratios are lower compared to field galaxies at similar stellar mass/metallicity. The presence of a large fraction of metals locked up in dust in these systems suggests altered chemical evolution in the dense environment. Additionally, low ratios are driven not only by Hi deficiencies, but also by decreased H-2-to-dust ratios.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2021)
Article
Astronomy & Astrophysics
M. S. Mirakhor, S. A. Walker, J. Runge
Summary: The study reveals the presence of an X-ray emission bridge between the two galaxy clusters in the Abell 2029/2033 system, which can be explained as emission from a filament of about 1.0 Mpc wide with a gas density roughly 160 times the mean baryon density of the Universe and a lower temperature. This finding is consistent with X-ray studies of the Abell 222/223 filament, showing similar geometry, density, and temperature characteristics.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2022)
Article
Astronomy & Astrophysics
Y. Ichinohe, A. Simionescu, N. Werner, M. Markevitch, Q. H. S. Wang
Summary: The analysis of deep archival Chandra observations of the high-temperature galaxy cluster Abell 2319 reveals a prominent cold front with various features possibly caused by KH instabilities. Additionally, the study observes a split at the northern edge of the cold front and an internal "hole" phenomenon, indicating potential remnants of extremely powerful AGN outbursts.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2021)
Article
Astronomy & Astrophysics
A. Mercurio, P. Rosati, A. Biviano, M. Annunziatella, M. Girardi, B. Sartoris, M. Nonino, M. Brescia, G. Riccio, C. Grillo, I Balestra, G. B. Caminha, G. De Lucia, R. Gobat, S. Seitz, P. Tozzi, M. Scodeggio, E. Vanzella, G. Angora, P. Bergamini, S. Borgani, R. Demarco, M. Meneghetti, V Strazzullo, L. Tortorelli, K. Umetsu, A. Fritz, D. Gruen, D. Kelson, M. Lombardi, C. Maier, M. Postman, G. Rodighiero, B. Ziegler
Summary: The impact of environment on galaxy evolution in different mass ranges remains controversial. By studying the spectral properties and positions of specific galaxies in galaxy clusters, it was found that passive galaxies are mainly located in the virialized regions, while emission-line galaxies are accreted into the clusters at later times. Additionally, there is an asymmetric distribution of colored galaxies and post-starburst galaxies in the projected phase-space diagram, suggesting that backsplash galaxies may exist at high positive velocities. Furthermore, low-mass passive galaxies are accreted into clusters before high-mass galaxies, indicating that early-accreted low-mass galaxies may have had time to quench their star formation.
ASTRONOMY & ASTROPHYSICS
(2021)
Article
Astronomy & Astrophysics
M. M. Lopez-Gutierrez, H. Bravo-Alfaro, J. H. van Gorkom, C. A. Caretta, F. Durret, L. M. Nunez-Beltran, Y. L. Jaffe, M. Hirschmann, D. Perez-Millan
Summary: We study the impact of the local environment on the transformation of spiral galaxies in three nearby Abell clusters. Our observations and analysis reveal that a portion of bright spirals are not detected in H i, and there are significant fractions of abnormal objects and red spirals, indicating an ongoing process of quenching. We find that ram-pressure plays an important role in stripping and transforming late-types, and the dynamical stage of the clusters helps to understand the transformation process.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2022)
Article
Astronomy & Astrophysics
M. Girardi, W. Boschin, M. Nonino, C. Innocentin, S. De Grandi
Summary: This study investigates the velocity field of the galaxy cluster Abell 780 and discovers an X-ray tail associated with a specific galaxy. It also detects the presence of a small galaxy group related to the cluster.
ASTRONOMY & ASTROPHYSICS
(2022)
Article
Astronomy & Astrophysics
J. S. Sanders, V Biffi, M. Brueggen, E. Bulbul, K. Dennerl, K. Dolag, T. Erben, M. Freyberg, E. Gatuzz, V Ghirardini, D. N. Hoang, M. Klein, A. Liu, A. Merloni, F. Pacaud, M. E. Ramos-Ceja, T. H. Reiprich, J. A. ZuHone
Summary: Abell 3266 is a bright galaxy cluster in X-ray and well-known for its merging subclusters. Using the eROSITA telescope, we observed the cluster and identified multiple merging subclusters and filamentary structures. We computed the thermodynamic properties and metallicity of the cluster and detected background galaxy clusters and groups.
ASTRONOMY & ASTROPHYSICS
(2022)
Article
Astronomy & Astrophysics
Chao Geng, Chong Ge, Dharam Lal, Ming Sun, Li Ji, Haiguang Xu, Wenhao Liu, Martin Hardcastle, William Forman, Ralph Kraft, Christine Jones
Summary: Abell 407 (A407) is a unique galaxy cluster hosting a central compact group of nine galaxies within a 30 kpc radius region. The cluster core also hosts a luminous radio active galactic nucleus (AGN). Through Chandra observation, the X-ray properties of A407's intracluster medium and central galaxies were studied, revealing a weak cool core and a small galaxy corona associated with the radio AGN. The central group of galaxies is undergoing a slow merge, and regions overlapped with the radio jets have higher temperature and metallicity. Overall, A407 is a unique system that can help understand the formation of massive brightest cluster galaxies.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2022)
Article
Astronomy & Astrophysics
Juhi Tiwari, Kulinder Pal Singh
Summary: This study presents the first in-depth analysis of the X-ray emission from the nearby galaxy cluster Abell 1569 using archived Chandra observation data. The results show that Abell 1569 consists of two unbound subclusters, with X-ray emissions extending to certain radii and exhibiting low luminosities, temperatures, and abundances. Additionally, the study detects cavities coinciding with radio lobes and possible evidence of a cluster-subcluster merger.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2022)
Article
Astronomy & Astrophysics
S. Andreon, A. Moretti, H. Boehringer, F. Castagna
Summary: Entropy is a useful tool to study the thermodynamic history of galaxy cluster plasma. The entropy profile of the Abell 2244 galaxy cluster is derived using X-ray data from the Swift XRT telescope and the Planck y data. The bending of the entropy profile, observed due to a sharp drop in cluster temperature, is confirmed using the Compton map. Theoretical predictions suggest that this bending is a result of a decrease in inflow through the virial boundary.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2023)
Article
Astronomy & Astrophysics
R. E. G. Machado, T. F. Lagana, G. S. Souza, A. Caproni, A. S. R. Antas, E. A. Mello-Terencio
Summary: Off-axis collisions between galaxy clusters can cause sloshing, resulting in the dragging of dense gas from the cool core and the formation of a spiral structure with enhanced X-ray emission. The study found that Abell 2199 exhibits signs of this sloshing phenomenon, which can be explained by a large inclination angle under which the sloshing spiral is observed.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2022)
Article
Astronomy & Astrophysics
Maria J. Jimenez-Donaire, Toby Brown, Christine D. Wilson, Ian D. Roberts, Nikki Zabel, Sara L. Ellison, Mallory Thorp, Vicente Villanueva, Ryan Chown, Dhruv Bisaria, Alberto D. Bolatto, Alessandro Boselli, Barbara Catinella, Aeree Chung, Luca Cortese, Timothy A. Davis, Claudia D. P. Lagos, Bumhyun Lee, Laura C. Parker, Kristine Spekkens, Adam R. H. Stevens, Jiayi Sun
Summary: In this study, we aimed to understand the influence of galactic environment and gravitational interactions on the star formation process in the context of galaxy evolution. By observing the molecular gas content and star formation rate of 37 spiral galaxies in the Virgo cluster, we found a relationship between the two, although there are variations among different galaxies.
ASTRONOMY & ASTROPHYSICS
(2023)
Article
Astronomy & Astrophysics
R. Rakhi, Geethika Santhosh, Prajwel Joseph, Koshy George, Smitha Subramanian, Indulekha Kavila, J. Postma, Pierre-Alain Duc, Patrick Cote, Luca Cortese, S. K. Ghosh, Annapurni Subramaniam, Shyam Tandon, John Hutchings, P. Samuel Wesley, Aditya Bharadwaj, Neeran Niroula
Summary: NGC 5291 is an early-type galaxy surrounded by a giant H I ring, which is believed to have been formed from collision with another galaxy. This collisional ring contains several star forming complexes and tidal dwarf galaxies, serving as sites of star formation in extreme dynamical environments. Using high spatial resolution FUV and NUV imaging observations, the star formation activity in the NGC 5291 system was studied and quantified, with the estimation of the total star formation rate.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2023)
Article
Astronomy & Astrophysics
T. N. Reynolds, B. Catinella, L. Cortese, N. Deg, H. Denes, A. Elagali, B. -Q. For, P. Kamphuis, D. Kleiner, B. S. Koribalski, K. Lee-Waddell, C. Murugeshan, W. Raja, J. Rhee, K. Spekkens, L. Staveley-Smith, J. M. van der Hulst, J. Wang, T. Westmeier, O. I. Wong, F. Bigiel, A. Bosma, B. W. Holwerda, D. A. Leahy, M. J. Meyer
Summary: We investigated the diversity in sizes and surface densities of neutral atomic hydrogen (H I) gas discs in nearly 280 nearby galaxies detected by WALLABY. By combining H I data with photometry, we examined the relationship between stellar structure, star formation, and H I structural parameters. Our results showed that galaxies with higher stellar masses and surface densities tend to have less extended H I discs and lower H I surface densities. Moreover, higher H I surface densities and more extended H I discs were found to be associated with more star formation.
PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF AUSTRALIA
(2023)
Article
Astronomy & Astrophysics
Alessandro Ignesti, Marisa Brienza, Benedetta Vulcani, Bianca M. Poggianti, Antonino Marasco, Rory Smith, Martin J. Hardcastle, Andrea Botteon, Ian D. Roberts, Jacopo Fritz, Rosita Paladino, Myriam Gitti, Anna Wolter, Neven Tomicic, Sean McGee, Alessia Moretti, Marco Gullieuszik, Alexander Drabent
Summary: We report the serendipitous discovery of an unprecedented interaction between the radio lobe of a radio galaxy and a spiral galaxy. The interaction, which occurred between the central galaxy GIN 049 and the spiral galaxy JO36, resulted in a positive feedback event for JO36, leading to a significant increase in its star formation rate.
ASTROPHYSICAL JOURNAL
(2023)
Article
Astronomy & Astrophysics
Toby Brown, Ian D. Roberts, Mallory Thorp, Sara L. Ellison, Nikki Zabel, Christine D. Wilson, Yannick M. Bahe, Dhruv Bisaria, Alberto D. Bolatto, Alessandro Boselli, Aeree Chung, Luca Cortese, Barbara Catinella, Timothy A. Davis, Maria J. Jimenez-Donaire, Claudia D. P. Lagos, Bumhyun Lee, Laura C. Parker, Rory Smith, Kristine Spekkens, Adam R. H. Stevens, Vicente Villanueva, Adam B. Watts
Summary: This study investigates how the environment regulates the star formation cycle of satellite galaxies in the Virgo Cluster. The results show that environmental mechanisms, such as ram pressure stripping and starvation, play a significant role in quenching star formation in H i-poor galaxies.
ASTROPHYSICAL JOURNAL
(2023)
Article
Astronomy & Astrophysics
Victor D. Johnston, Anne M. Medling, Brent Groves, Lisa J. Kewley, Luca Cortese, Scott Croom, Angel R. Lopez-Sanchez, Henry Zovaro, Joss Bland-Hawthorn, Julia Bryant, Jon Lawrence, Matt Owers, Samuel Richards, Jesse van de Sande
Summary: Researchers propose a new method to distinguish the ionizing source in resolved galaxy spectra by using a multidimensional diagnostic diagram. Compared to traditional emission-line ratio diagnostics, this method can more accurately identify the type of ionizing source. The results show that using this improved method can identify more different types of ionizing sources.
ASTROPHYSICAL JOURNAL
(2023)
Article
Astronomy & Astrophysics
Xuchen Lin, Jing Wang, Virginia Kilborn, Eric W. Peng, Luca Cortese, Alessandro Boselli, Ze-Zhong Liang, Bumhyun Lee, Dong Yang, Barbara Catinella, N. Deg, H. Denes, Ahmed Elagali, P. Kamphuis, B. S. Koribalski, K. Lee-Waddell, Jonghwan Rhee, Li Shao, Kristine Spekkens, Lister Staveley-Smith, T. Westmeier, O. Ivy Wong, Kenji Bekki, Albert Bosma, Min Du, Luis C. Ho, Juan P. Madrid, Lourdes Verdes-Montenegro, Huiyuan Wang, Shun Wang
Summary: Using data from ASKAP and ALFA, this study investigates the effect of ram pressure and tidal interactions in the NGC 4636 group. It finds that gas stripping is widespread in this group, affecting 80% of nonmerging galaxies and 41% are experiencing both types of stripping. The strengths of these effects are correlated with H i-disk shrinkage and the tidal strength is related to the reddening of low-mass galaxies.
ASTROPHYSICAL JOURNAL
(2023)
Article
Astronomy & Astrophysics
Fabio Rigamonti, Massimo Dotti, Stefano Covino, Francesco Haardt, Luca Cortese, Marco Landoni, Ludovica Varisco
Summary: From a purely photometric perspective, galaxies are usually decomposed into a bulge+disc system, but recent observations have shown that this oversimplifies the complexity, especially when considering galaxy kinematics. To address this issue, a novel approach called bang was introduced, which uses analytical potential-density pairs as galactic components for a computationally fast and reliable fit of the morphological and kinematic properties of galaxies. By applying bang to the SDSS-MaNGA survey, key parameters such as mass, radial extensions, and dynamics were estimated for bulges and discs of over 10,000 objects.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2023)
Article
Astronomy & Astrophysics
Annagrazia Puglisi, Ugne Dudzeviciute, Mark Swinbank, Steven Gillman, Alfred L. Tiley, Richard G. Bower, Michele Cirasuolo, Luca Cortese, Karl Glazebrook, Chris Harrison, Edo Ibar, Juan Molina, Danail Obreschkow, Kyle A. Oman, Matthieu Schaller, Francesco Shankar, Ray M. Sharples
Summary: We present the first results from the KMOS Ultra-deep Rotation Velocity Survey (KURVS), which examines the outer rotation curves and dark matter content of 22 star-forming galaxies at z similar to 1.5. Using Hα emission, we analyze individual rotation curves to a radius of 4 times the effective radius, finding that most curves are flat or rising between three and six disc scale radii. Our measurements suggest a declining dark matter fraction with increasing stellar mass and stellar mass surface density. The tension with high stellar mass surface density observations indicates a need to reassess baryonic processes in the most massive galaxies.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2023)
Article
Astronomy & Astrophysics
N. Kovakkuni, F. Lelli, P-A Duc, M. Boquien, J. Braine, E. Brinks, V. Charmandaris, F. Combes, J. Fensch, U. Lisenfeld, S. S. McGaugh, J. C. Mihos, M. S. Pawlowski, Y. Revaz, P. M. Weilbacher
Summary: Research reveals that some star-forming regions in tidal dwarf galaxies (TDGs) resemble normal spiral galaxies, while others exhibit characteristics of extreme starbursts.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2023)
Article
Astronomy & Astrophysics
Pablo Corcho-Caballero, Yago Ascasibar, Luca Cortese, Sebastian F. Sanchez, Angel R. Lopez-Sanchez, Amelia Fraser-McKelvie, Tayyaba Zafar
Summary: The relationship between the mechanisms that cause the rapid quenching of star-forming systems and the properties of the overall galaxy population are still difficult to determine. In this study, we investigate the physical properties of galaxies in the MaNGA and SAMI surveys at different stages of their star formation history. By comparing galaxies with recent quenching signatures to the rest of the low star-forming and active population, we find that recently quenched galaxies are compact and low-mass satellite systems with higher metallicities than their long-lived counterparts. This study emphasizes the importance of distinguishing between old and recently quenched galaxies in order to understand the mechanisms driving galaxy evolution.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2023)
Article
Astronomy & Astrophysics
M. Stimpson, M. J. Hardcastle, M. G. H. Krause
Summary: In this study, we present relativistic magnetohydrodynamic simulations of jets interacting with spherically symmetric cluster atmospheres. By analyzing synthetic emission maps and examining dynamic, energetic, and polarimetric data, we find that the cluster atmosphere and jet power play a crucial role in shaping the morphology and energy distribution of the jets.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2023)
Article
Astronomy & Astrophysics
Francesco D'Eugenio, Arjen van der Wel, Joanna M. Piotrowska, Rachel Bezanson, Edward N. Taylor, Jesse van de Sande, William M. Baker, Eric F. Bell, Sabine Bellstedt, Joss Bland-Hawthorn, Asa F. L. Bluck, Sarah Brough, Julia J. Bryant, Matthew Colless, Luca Cortese, Scott M. Croom, Caro Derkenne, Pieter van Dokkum, Deanne Fisher, Caroline Foster, Anna Gallazzi, Anna de Graaff, Brent Groves, Josha van Houdt, Claudia del P. Lagos, Tobias J. Looser, Roberto Maiolino, Michael Maseda, J. Trevor Mendel, Angelos Nersesian, Camilla Pacifici, Adriano Poci, Rhea-Silvia Remus, Sarah M. Sweet, Sabine Thater, Kim-Vy Tran, Hannah Ubler, Lucas M. Valenzuela, Emily Wisnioski, Stefano Zibetti
Summary: This study presents the first investigation of spatially integrated higher-order stellar kinematics over cosmic time. It reveals that massive galaxies continue to accrete mass and increase their dispersion support after becoming quiescent.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2023)
Article
Astronomy & Astrophysics
Francesco D'Eugenio, Arjen van der Wel, Caro Derkenne, Josha van Houdt, Rachel Bezanson, Edward N. Taylor, Jesse van de Sande, William M. Baker, Eric F. Bell, Joss Bland-Hawthorn, Asa F. L. Bluck, Sarah Brough, Julia J. Bryant, Matthew Colless, Luca Cortese, Scott M. Croom, Pieter van Dokkum, Deanne Fisher, Caroline Foster, Amelia Fraser-McKelvie, Anna Gallazzi, Anna de Graaff, Brent Groves, Claudia del P. Lagos, Tobias J. Looser, Roberto Maiolino, Michael Maseda, J. Trevor Mendel, Angelos Nersesian, Camilla Pacifici, Joanna M. Piotrowska, Adriano Poci, Rhea-Silvia Remus, Gauri Sharma, Sarah M. Sweet, Sabine Thater, Kim-Vy Tran, Hannah Ubler, Lucas M. Valenzuela, Emily Wisnioski, Stefano Zibetti
Summary: This study presents the first statistical analysis of non-Gaussian stellar kinematics spanning 7 billion years in cosmic time. The results show an anticorrelation between the excess kurtosis of the stellar velocity distribution and the rotation-to-dispersion ratio, indicating a physical connection between these two kinematic observables. Additionally, there is a correlation between the excess kurtosis and the stellar mass, potentially linked to the assembly history of galaxies.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2023)
Article
Astronomy & Astrophysics
Adam B. Watts, Luca Cortese, Barbara Catinella, Toby Brown, Christine D. Wilson, Nikki Zabel, Ian D. Roberts, Timothy A. Davis, Mallory Thorp, Aeree Chung, Adam R. H. Stevens, Sara L. Ellison, Kristine Spekkens, Laura C. Parker, Yannick M. Bahe, Vicente Villanueva, Maria Jimenez-Donaire, Dhruv Bisaria, Alessandro Boselli, Alberto D. Bolatto, Bumhyun Lee
Summary: The quenching of cluster satellite galaxies is closely related to the suppression of their cold interstellar medium (ISM) by environmental mechanisms. While the removal of neutral atomic hydrogen (H I) at large radii is well studied, how the environment impacts the remaining gas in the centres of galaxies, which are dominated by molecular gas, is less clear.
PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF AUSTRALIA
(2023)