Article
Astronomy & Astrophysics
P. Bonfini, A. Zezas, M. L. N. Ashby, S. P. Willner, A. Maragkoudakis, K. Kouroumpatzakis, P. H. Sell, K. Kovlakas
Summary: The study uses the Star Formation Reference Survey to constrain the mass distribution in nearby star-forming galaxies and measure the integrated luminosity density and total stellar mass density. The results indicate that discs dominate the mass density budget and recent star formation primarily happened in massive systems within the discs.
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
A. Fraser-McKelvie, L. Cortese, J. van de Sande, J. J. Bryant, B. Catinella, M. Colless, S. M. Croom, B. Groves, A. M. Medling, N. Scott, S. M. Sweet, J. Bland-Hawthorn, M. Goodwin, J. Lawrence, N. Lorente, M. S. Owers, S. N. Richards
Summary: The study found that galaxies on the main sequence have intrinsic flattened discs as indicated by lambda(Re) values, but at higher stellar masses there is evidence of dispersion-supported structures, potentially suggesting a connection between bulges and the bending of the main sequence. High-mass and low-mass galaxies appear to be influenced by different quenching mechanisms.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2021)
Article
Astronomy & Astrophysics
Evelyn J. Johnston, Boris Haussler, Keerthana Jegatheesan, Amelia Fraser-McKelvie, Lodovico Coccato, Arianna Cortesi, Yara Jaffe, Gaspar Galaz, Marcelo Mora, Yasna Ordenes-Briceno
Summary: This study used BUDDI to extract the spectra of the bulges and discs of 78 S0 galaxies and compared their stellar populations. The results show that bulges are generally older and more metal rich than discs. The stellar mass of a galaxy plays a more significant role in the formation of bulges. More massive S0 galaxies form through an inside-out scenario, while lower mass ones may form through an outside-in scenario or together with the discs.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2022)
Article
Astronomy & Astrophysics
V Kalinova, D. Colombo, S. F. Sanchez, E. Rosolowsky, K. Kodaira, R. Garcia-Benito, S. E. Meidt, T. A. Davis, A. B. Romeo, S-Y Yu, R. Gonzalez Delgado, E. A. D. Lacerda
Summary: It has been suggested that gravitational potential can play a significant role in suppressing star formation in nearby galaxies. To investigate this scenario, we studied the connection between dynamics and star formation quenching in 215 non-active galaxies. Our results show that galaxies with similar gravitational potential tend to exhibit a certain pattern of star formation quenching. Further analysis reveals that both the amplitude and shape of the gravitational potential are important factors in the quenching history of a galaxy.
ASTRONOMY & ASTROPHYSICS
(2022)
Article
Astronomy & Astrophysics
Evelyn J. Johnston, Alfonso Aragon-Salamanca, Amelia Fraser-McKelvie, Michael Merrifield, Boris Haeussler, Lodovico Coccato, Yara Jaffe, Ariana Cortesi, Ana Chies-Santos, Bruno Rodriguez Del Pino, Yun-Kyeong Sheen
Summary: The study successfully separated the spectra of the bulge, disc, and lens components within S0 galaxies, revealing different characteristics in their stellar populations. The majority of the mass in these galaxies was found to have been built up early in their lifetime, with bulges and discs forming from the same material at high redshifts, while lenses formed independently at more random times within the galaxy's lifetime.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2021)
Article
Astronomy & Astrophysics
Rogerio Riffel, Nicolas D. Mallmann, Gabriele S. Ilha, Thaisa Storchi-Bergmann, Rogemar A. Riffel, Sandro B. Rembold, Dmitry Bizyaev, Janaina C. do Nascimento, Jaderson S. Schimoia, Luiz N. da Costa, Nicholas Fraser Boardman, Mederic Boquien, Guilherme S. Couto
Summary: The study found that consistent results can be obtained through stellar population synthesis and gas wavelength extinction, and established an effective conversion relationship. In addition, the ratio of gas to stellar extinction varies within a certain range, indicating that the difference in extinction may be related to the age and degree of influence of the stellar population.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2021)
Article
Astronomy & Astrophysics
Rogerio Riffel, Nicolas D. Mallmann, Gabriele S. Ilha, Thaisa Storchi-Bergmann, Rogemar A. Riffel, Sandro B. Rembold, Dmitry Bizyaev, Janaina C. do Nascimento, Jaderson S. Schimoia, Luiz N. da Costa, Nicholas Fraser Boardman, Mederic Boquien, Guilherme S. Couto
Summary: This study investigates the impact of active galactic nuclei (AGNs) feedback on host galaxies and its role in enhancing or suppressing star formation. By comparing 170 AGN hosts and a control sample of 291 galaxies, it was found that the SFR derived from the stellar population over the past 20 Myr closely matches the SFR derived from the gas.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2021)
Article
Astronomy & Astrophysics
L. Cortese, A. Fraser-McKelvie, J. Woo, B. Catinella, K. E. Harborne, J. van de Sande, J. Bland-Hawthorn, S. Brough, J. J. Bryant, S. Croom, S. Sweet
Summary: In this study, the correlation between stellar surface density (sigma(1)) and the proxy for stellar spin parameter (lambda(re)) was investigated for 1599 nearby galaxies. The results showed that changes in sigma(1) were mirrored by changes in lambda(re) on the star-forming main sequence, but not below it. Passive galaxies were found to be more heterogeneous in terms of their structure compared to star-forming galaxies and may have followed different evolutionary paths.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2022)
Article
Astronomy & Astrophysics
W. J. Pearson, L. Wang, S. Brough, B. W. Holwerda, A. M. Hopkins, J. Loveday
Summary: The study found that galaxies typically become larger as the group mass increases, especially for larger galaxies. However, there is no indication that galaxies are typically more or less clumpy as the environment changes. Additionally, it was observed that star-forming galaxies do not become more bulge or disk dominated as the group mass changes, and asymmetry does not appear to be greatly influenced by environment.
ASTRONOMY & ASTROPHYSICS
(2021)
Article
Astronomy & Astrophysics
Boris S. Kalita, Emanuele Daddi, Frederic Bournaud, Robert Michael Rich, Francesco Valentino, Carlos Gomez-Guijarro, Sandrine Codis, Ivan Delvecchio, David Elbaz, Veronica Strazzullo, Victor de Souza Magalhaes, Jerome Pety, Qinghua Tan
Summary: The study analyzed three massive galaxies at the core of the RO-1001 galaxy group, finding that the lopsidedness of their disks may result in the suppression of star formation and the formation of central starbursts. This provides observational evidence of the impact of cold accretion streams on galaxy formation and evolution.
ASTRONOMY & ASTROPHYSICS
(2022)
Article
Astronomy & Astrophysics
I. Millan-Irigoyen, M. G. del Valle-Espinosa, R. Fernandez-Aranda, L. Galbany, J. M. Gomes, M. Moreno-Raya, A. R. Lopez-Sanchez, M. Molla
Summary: In this study, we investigate galaxies hosting type Ia supernova (SN Ia) at different redshifts, using Gran Telescopio de Canarias (GTC) optical spectroscopy and inverse stellar population synthesis. We estimate the star formation and enrichment histories of these galaxies and find a clear correlation between the Hubble residuals and stellar metallicity. These results are important for understanding galaxy evolution and the mechanisms behind SN Ia explosions.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2022)
Article
Astronomy & Astrophysics
Di Wang, Scott M. Croom, Julia J. Bryant, Sam P. Vaughan, Adam L. Schaefer, Francesco D'Eugenio, Stefania Barsanti, Sarah Brough, Claudia del P. Lagos, Anne M. Medling, Sree Oh, Jesse van de Sande, Giulia Santucci, Joss Bland-Hawthorn, Michael Goodwin, Brent Groves, Jon Lawrence, Matt S. Owers, Samuel Richards
Summary: We study the impact of environment on the quenching of galaxies using the SAMI Galaxy Survey. By analyzing star formation and stellar population ages, we find that concentrated star formation is a potential indicator of 'outside-in' quenching in groups and clusters. The age difference between SF-concentrated galaxies and regular galaxies suggests that the quenching process is slower in groups and faster in clusters.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2022)
Article
Astronomy & Astrophysics
S. Duarte Puertas, J. M. Vilchez, J. Iglesias-Paramo, M. Molla, E. Perez-Montero, C. Kehrig, L. S. Pilyugin, I. A. Zinchenko
Summary: This study investigates the stellar mass-metallicity relation (MZR) of star-forming galaxies in the local Universe, finding a complex relation between MZR and star formation rate (SFR) that is dependent on the age of the stellar populations. The findings highlight the importance of considering stellar age when studying the MZR-SFR relation.
ASTRONOMY & ASTROPHYSICS
(2022)
Article
Astronomy & Astrophysics
M. Querejeta, E. Schinnerer, S. Meidt, J. Sun, A. K. Leroy, E. Emsellem, R. S. Klessen, J. C. Munoz-Mateos, H. Salo, E. Laurikainen, I Beslic, G. A. Blanc, M. Chevance, D. A. Dale, C. Eibensteiner, C. Faesi, A. Garcia-Rodriguez, S. C. O. Glover, K. Grasha, J. Henshaw, C. Herrera, A. Hughes, K. Kreckel, J. M. D. Kruijssen, D. Liu, E. J. Murphy, H-A Pan, J. Pety, A. Razza, E. Rosolowsky, T. Saito, A. Schruba, A. Usero, E. J. Watkins, T. G. Williams
Summary: We investigated the impact of different environments on the molecular gas content, star formation rate, and depletion time in 74 nearby galaxies. Our findings suggest that the stellar structures in galaxies strongly affect the organization of molecular gas and star formation, but have a more subtle impact on star formation efficiency.
ASTRONOMY & ASTROPHYSICS
(2021)
Article
Astronomy & Astrophysics
E. Merlin, M. Castellano, H. Bretonniere, M. Huertas-Company, U. Kuchner, D. Tuccillo, F. Buitrago, J. R. Peterson, C. J. Conselice, F. Caro, P. Dimauro, L. Nemani, A. Fontana, M. Kuemmel, B. Haussler, W. G. Hartley, A. Alvarez Ayllon, E. Bertin, P. Dubath, F. Ferrari, L. Ferreira, R. Gavazzi, D. Hernandez-Lang, G. Lucatelli, A. S. G. Robotham, M. Schefer, C. Tortora, N. Aghanim, A. Amara, L. Amendola, N. Auricchio, M. Baldi, R. Bender, C. Bodendorf, E. Branchini, M. Brescia, S. Camera, V. Capobianco, C. Carbone, J. Carretero, F. J. Castander, S. Cavuoti, A. Cimatti, R. Cledassou, G. Congedo, L. Conversi, Y. Copin, L. Corcione, F. Courbin, M. Cropper, A. Da Silva, H. Degaudenzi, J. Dinis, M. Douspis, F. Dubath, C. A. J. Duncan, X. Dupac, S. Dusini, S. Farrens, S. Ferriol, M. Frailis, E. Franceschi, P. Franzetti, S. Galeotta, B. Garilli, B. Gillis, C. Giocoli, A. Grazian, F. Grupp, S. V. H. Haugan, H. Hoekstra, W. Holmes, F. Hormuth, A. Hornstrup, P. Hudelot, K. Jahnke, S. Kermiche, A. Kiessling, T. Kitching, R. Kohley, M. Kunz, H. Kurki-Suonio, S. Ligori, P. B. Lilje, I. Lloro, O. Mansutti, O. Marggraf, K. Markovic, F. Marulli, R. Massey, H. J. McCracken, E. Medinaceli, M. Melchior, M. Meneghetti, G. Meylan, M. Moresco, L. Moscardini, E. Munari, S. M. Niemi, C. Padilla, S. Paltani, F. Pasian, K. Pedersen, W. J. Percival, G. Polenta, M. Poncet, L. Popa, L. Pozzetti, F. Raison, R. Rebolo, A. Renzi, J. Rhodes, G. Riccio, E. Romelli, E. Rossetti, R. Saglia, D. Sapone, B. Sartoris, P. Schneider, A. Secroun, G. Seidel, C. Sirignano, G. Sirri, J. Skottfelt, J. -L. Starck, P. Tallada-Crespi, A. N. Taylor, I. Tereno, R. Toledo-Moreo, I. Tutusaus, L. Valenziano, T. Vassallo, Y. Wang, J. Weller, A. Zacchei, G. Zamorani, J. Zoubian, S. Andreon, S. Bardelli, A. Boucaud, C. Colodro-Conde, D. Di Ferdinando, J. Gracia-Carpio, V. Lindholm, N. Mauri, S. Mei, C. Neissner, V. Scottez, A. Tramacere, E. Zucca, C. Baccigalupi, A. Balaguera-Antolinez, M. Ballardini, F. Bernardeau, A. Biviano, S. Borgani, A. S. Borlaff, C. Burigana, R. Cabanac, A. Cappi, C. S. Carvalho, S. Casas, G. Castignani, A. R. Cooray, J. Coupon, H. M. Courtois, O. Cucciati, S. Davini, G. De Lucia, G. Desprez, J. A. Escartin, S. Escoffier, M. Farina, K. Ganga, J. Garcia-Bellido, K. George, G. Gozaliasl, H. Hildebrandt, I. Hook, O. Ilbert, S. Ilic, B. Joachimi, V. Kansal, E. Keihanen, C. C. Kirkpatrick, A. Loureiro, J. Macias-Perez, M. Magliocchetti, G. Mainetti, R. Maoli, S. Marcin, M. Martinelli, N. Martinet, S. Matthew, M. Maturi, R. B. Metcalf, P. Monaco, G. Morgante, S. Nadathur, A. A. Nucita, L. Patrizii, V. Popa, C. Porciani, D. Potter, A. Pourtsidou, M. Pontinen, P. Reimberg, A. G. Sanchez, Z. Sakr, M. Schirmer, M. Sereno, J. Stadel, R. Teyssier, C. Valieri, J. Valiviita, S. E. van Mierlo, A. Veropalumbo, M. Viel, J. R. Weaver, D. Scott
Summary: The Euclid mission of the European Space Agency aims to provide high-quality imaging for 1.5 billion galaxies. A software pipeline is being developed to process and analyze the massive amount of data in real time, including a model-fitting algorithm for important photometric and morphological estimates. The Euclid Morphology Challenge compares five model-fitting software packages on simulated data to identify the best algorithm for implementation.
ASTRONOMY & ASTROPHYSICS
(2023)
Article
Astronomy & Astrophysics
H. Bretonniere, U. Kuchner, M. Huertas-Company, E. Merlin, M. Castellano, D. Tuccillo, F. Buitrago, C. J. Conselice, A. Boucaud, B. Haeussler, M. Kuemmel, W. G. Hartley, A. Alvarez Ayllon, E. Bertin, F. Ferrari, L. Ferreira, R. Gavazzi, D. Hernandez-Lang, G. Lucatelli, A. S. G. Robotham, M. Schefer, L. Wang, R. Cabanac, H. Dominguez Sanchez, P. -A. Duc, S. Fotopoulou, S. Kruk, A. La Marca, B. Margalef-Bentabol, F. R. Marleau, C. Tortora, N. Aghanim, A. Amara, N. Auricchio, R. Azzollini, M. Baldi, R. Bender, C. Bodendorf, E. Branchini, M. Brescia, J. Brinchmann, S. Camera, V. Capobianco, C. Carbone, J. Carretero, F. J. Castander, S. Cavuoti, A. Cimatti, R. Cledassou, G. Congedo, L. Conversi, Y. Copin, L. Corcione, F. Courbin, M. Cropper, A. Da Silva, H. Degaudenzi, J. Dinis, F. Dubath, C. A. J. Duncan, X. Dupac, S. Dusini, S. Farrens, S. Ferriol, M. Frailis, E. Franceschi, M. Fumana, S. Galeotta, B. Garilli, B. Gillis, C. Giocoli, A. Grazian, F. Grupp, S. V. H. Haugan, H. Hoekstra, W. Holmes, F. Hormuth, A. Hornstrup, P. Hudelot, K. Jahnke, S. Kermiche, A. Kiessling, R. Kohley, M. Kunz, H. Kurki-Suonio, S. Ligori, P. B. Lilje, I. Lloro, O. Mansutti, O. Marggraf, K. Markovic, F. Marulli, R. Massey, H. J. McCracken, E. Medinaceli, M. Melchior, M. Meneghetti, G. Meylan, M. Moresco, L. Moscardini, E. Munari, S. M. Niemi, C. Padilla, S. Paltani, F. Pasian, K. Pedersen, W. Percival, V. Pettorino, G. Polenta, M. Poncet, L. Pozzetti, F. Raison, R. Rebolo, A. Renzi, J. Rhodes, G. Riccio, E. Romelli, C. Rosset, E. Rossetti, R. Saglia, D. Sapone, B. Sartoris, P. Schneider, A. Secroun, G. Seidel, C. Sirignano, G. Sirri, J. Skottfelt, J. -L. Starck, P. Tallada-Crespi, A. N. Taylor, I. Tereno, R. Toledo-Moreo, I. Tutusaus, E. A. Valentijn, L. Valenziano, T. Vassallo, Y. Wang, J. Weller, G. Zamorani, J. Zoubian, S. Andreon, S. Bardelli, C. Colodro-Conde, D. Di Ferdinando, J. Gracia-Carpio, V. Lindholm, N. Mauri, S. Mei, V. Scottez, E. Zucca, C. Baccigalupi, M. Ballardini, F. Bernardeau, A. Biviano, S. Borgani, A. S. Borlaff, C. Burigana, A. Cappi, C. S. Carvalho, S. Casas, G. Castignani, A. R. Cooray, J. Coupon, H. M. Courtois, S. Davini, G. De Lucia, G. Desprez, J. A. Escartin, S. Escoffier, M. Fabricius, M. Farina, A. Fontana, K. Ganga, J. Garcia-Bellido, K. George, G. Gozaliasl, H. Hildebrandt, I. Hook, O. Ilbert, S. Ilic, B. Joachimi, V. Kansal, E. Keihanen, C. C. Kirkpatrick, A. Loureiro, J. Macias-Perez, M. Magliocchetti, R. Maoli, S. Marcin, M. Martinelli, N. Martinet, M. Maturi, P. Monaco, G. Morgante, S. Nadathur, A. A. Nucita, L. Patrizii, V. Popa, C. Porciani, D. Potter, A. Pourtsidou, M. Poentinen, P. Reimberg, A. G. Sanchez, Z. Sakr, M. Schirmer, E. Sefusatti, M. Sereno, J. Stadel, R. Teyssier, J. Valiviita, S. E. van Mierlo, A. Veropalumbo, M. Viel, J. R. Weaver, D. Scott
Summary: The surveys conducted by Euclid will serve as a reference for the study of galaxy morphology, providing imaging over an unprecedented area. This paper evaluates the accuracy of parametric galaxy morphology measurements in imaging predicted from within the Euclid Wide Survey. It is concluded that the official Euclid Data Releases will deliver robust structural parameters for at least 400 million galaxies in the Euclid Wide Survey.
ASTRONOMY & ASTROPHYSICS
(2023)
Article
Astronomy & Astrophysics
Caitlin Rose, Jeyhan S. Kartaltepe, Gregory F. Snyder, Vicente Rodriguez-Gomez, L. Y. Aaron Yung, Pablo Arrabal Haro, Micaela B. Bagley, Antonello Calabro, Nikko J. Cleri, M. C. Cooper, Luca Costantin, Darren Croton, Mark Dickinson, Steven L. Finkelstein, Boris Haussler, Benne W. Holwerda, Anton M. Koekemoer, Peter Kurczynski, Ray A. Lucas, Kameswara Bharadwaj Mantha, Casey Papovich, Pablo G. Perez-Gonzalez, Nor Pirzkal, Rachel S. Somerville, Amber N. Straughn, Sandro Tacchella
Summary: Identifying merging galaxies is an important step in studying galaxy evolution, but it is also challenging. This study uses random forest classifications to identify galaxy mergers from simulated JWST images based on morphological parameters. The results show that the random forests can accurately classify a significant percentage of merging and non-merging galaxies across a wide redshift range. Adjusting the classification probability threshold does not improve the performance of the classifications. The merger fraction and merger rate derived from the random forest classifications match with theoretical predictions but are slightly underestimated.
ASTROPHYSICAL JOURNAL
(2023)
Article
Astronomy & Astrophysics
Kevin C. Cooke, Jeyhan S. Kartaltepe, Caitlin Rose, K. D. Tyler, Behnam Darvish, Sarah K. Leslie, Ying-jie Peng, Boris Haussler, Anton M. Koekemoer
Summary: We investigated the relationship between environment, morphology, and the star formation rate (SFR)-stellar mass relation in a sample of star-forming galaxies from the COSMOS field. By analyzing the spectral energy distributions, we found that the main sequence of star formation does not show an environmental dependence at any redshift from 0 < z < 3.5. We also determined that the turnover at the high stellar mass is not driven by bulge growth, but rather by the specific SFR of the disk component evolving with stellar mass.
ASTROPHYSICAL JOURNAL
(2023)
Article
Astronomy & Astrophysics
Camilla Pacifici, Kartheik G. Iyer, Bahram Mobasher, Elisabete da Cunha, Viviana Acquaviva, Denis Burgarella, Gabriela Calistro Rivera, Adam C. Carnall, Yu-Yen Chang, Nima Chartab, Kevin C. Cooke, Ciaran Fairhurst, Jeyhan Kartaltepe, Joel Leja, Katarzyna Malek, Brett Salmon, Marianna Torelli, Alba Vidal-Garcia, Mederic Boquien, Gabriel G. Brammer, Michael J. I. Brown, Peter L. Capak, Jacopo Chevallard, Chiara Circosta, Darren Croton, Iary Davidzon, Mark Dickinson, Kenneth J. Duncan, Sandra M. Faber, Harry C. Ferguson, Adriano Fontana, Yicheng Guo, Boris Haeussler, Shoubaneh Hemmati, Marziye Jafariyazani, Susan A. Kassin, Rebecca L. Larson, Bomee Lee, Kameswara Bharadwaj Mantha, Francesca Marchi, Hooshang Nayyeri, Jeffrey A. Newman, Viraj Pandya, Janine Pforr, Naveen Reddy, Ryan Sanders, Ekta Shah, Abtin Shahidi, Matthew L. Stevans, Dian Puspita Triani, Krystal D. Tyler, Brittany N. Vanderhoof, Alexander de la Vega, Weichen Wang, Madalyn E. Weston
Summary: The study analyzes the uncertainties in spectral energy distribution (SED) modeling and fitting in galaxy evolution. By applying 14 commonly used SED-fitting codes, the study finds agreement on stellar mass but discrepancies in star formation rate (SFR) and dust-attenuation results. The impact of modeling assumptions on derived parameters is explored, and the contribution of modeling choices to uncertainties is measured (0.1 dex in stellar mass, 0.3 dex in SFR, and 0.3 mag in dust attenuation).
ASTROPHYSICAL JOURNAL
(2023)
Article
Astronomy & Astrophysics
Wenhao Li, Preethi Nair, Jimmy Irwin, Sara Ellison, Shobita Satyapal, Niv Drory, Amy Jones, William Keel, Karen Masters, David Stark, Russell Ryan, Kavya Mukundan
Summary: We investigate the role of galaxy mergers in triggering active galactic nuclei (AGN) in the nearby universe. Our analysis is based on a sample of 79 post-merger remnant galaxies with deep X-ray observations capable of detecting low-luminosity AGN. We find that post-merger galaxies have a higher overall AGN fraction compared to noninteracting control galaxies, indicating the strong connection between mergers and AGN.
ASTROPHYSICAL JOURNAL
(2023)
Article
Astronomy & Astrophysics
David O'Ryan, Bruno Merin, Brooke D. Simmons, Antonia Vojtekova, Anna Anku, Mike Walmsley, Izzy L. Garland, Tobias Geron, William Keel, Sandor Kruk, Chris J. Lintott, Kameswara Bharadwaj Mantha, Karen L. Masters, Jan Reerink, Rebecca J. Smethurst, Matthew R. Thorne
Summary: Mergers play a crucial role in galaxy formation and evolution. This study uses the ESA Datalabs platform to create a larger catalog of interacting galaxies from the Hubble Space Telescope science archives. By utilizing the Zoobot convolutional neural network, the researchers make probabilistic interaction predictions for 126 million sources from the Hubble Source Catalog. The study not only provides valuable insights into interacting galaxy systems, but also demonstrates the efficiency of ESA Datalabs in facilitating archival analysis.
ASTROPHYSICAL JOURNAL
(2023)
Article
Astronomy & Astrophysics
Wenhao Li, Preethi Nair, Kate Rowlands, Karen Masters, David Stark, Niv Drory, Sara Ellison, Jimmy Irwin, Shobita Satyapal, Amy Jones, William Keel, Kavya Mukundan, Zachary Tu
Summary: By studying the incidence and properties of post-starburst galaxies (PSBs) in post-merger galaxies, it is found that there is a significant increase in the number of PSBs in post-mergers, and the outside-in quenching process is more pronounced than the inside-out quenching process. This suggests that galaxy mergers play an important role in triggering the quenching process.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2023)
Article
Astronomy & Astrophysics
Tobias Geron, Rebecca J. Smethurst, Chris Lintott, Sandor Kruk, Karen L. Masters, Brooke Simmons, Kameswara Bharadwaj Mantha, Mike Walmsley, L. Garma-Oehmichen, Niv Drory, Richard R. Lane
Summary: We studied the bar pattern speeds and corotation radii of 225 barred galaxies using MaNGA and the Tremaine-Weinberg method. We found that strongly barred galaxies have lower pattern speeds than weakly barred galaxies, suggesting that strong bars are more evolved. Interestingly, the corotation radius is not different between weakly and strongly barred galaxies, despite being proportional to bar length. Our results also show that the corotation radius differs significantly between quenching and star-forming galaxies.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2023)
Article
Astronomy & Astrophysics
Izzy L. Garland, Matthew J. Fahey, Brooke D. Simmons, Rebecca J. Smethurst, Chris J. Lintott, Jesse Shanahan, Maddie S. Silcock, Joshua Smith, William C. Keel, Alison Coil, Tobias Geron, Sandor Kruk, Karen L. Masters, David O'Ryan, Matthew R. Thorne, Klaas Wiersema
Summary: The role of large-scale bars in fuelling AGNs is still debated. This study investigates whether large-scale galactic bars are a good candidate for merger-free AGN fuelling. The results suggest that while bars may trigger AGN activity, they have no further, unique effect on a galaxy's stellar mass or star formation rate.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2023)
Article
Astronomy & Astrophysics
Oliver J. Bartlett, David M. Benoit, Kevin A. Pimbblet, Brooke Simmons, Laura Hunt
Summary: This paper presents an application of auto-encoders to reduce noise in single-shot astronomical images, and investigates its suitability for large-scale surveys. Auto-encoders are a machine learning model that summarizes an input and predicts a representation of a different input. The aim of the auto-encoder model is to retain morphological information while reducing noise in the image. The implementation of the auto-encoder includes convolutional and max pooling layers. Tests on images from the Panoramic Survey Telescope and Rapid Response System demonstrate noise reduction and morphology preservation.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2023)
Article
Astronomy & Astrophysics
Eilat Glikman, Rachel Langgin, Makoto A. Johnstone, Ilsang Yoon, Julia M. Comerford, Brooke D. Simmons, Hannah Stacey, Mark Lacy, John M. O'Meara
Summary: We have discovered a potential dual QSO at a redshift of 1.889, during the cosmic noon era. Using Hubble Space Telescope images, we found two closely separated point sources in a dust-reddened QSO. We confirmed the presence of two distinct QSO components through spectroscopic observations.
ASTROPHYSICAL JOURNAL LETTERS
(2023)