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
Matteo Bonato, Isabella Prandoni, Gianfranco De Zotti, Marisa Brienza, Raffaella Morganti, Mattia Vaccari
Summary: This study classified sources in the Lockman Hole field into radio loud (RL) AGNs, star-forming galaxies (SFGs), and radio quiet (RQ) AGNs based on multi-band information. The results show that at flux densities below 300 μJy, SFGs+RQ AGNs surpass RL AGNs, and there are indications of a similar evolution between RQ AGNs and SFGs.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2021)
Article
Astronomy & Astrophysics
S. A. Pustilnik, E. S. Egorova, A. Y. Kniazev, Y. A. Perepelitsyna, A. L. Tepliakova, A. N. Burenkov, D. Oparin
Summary: The ongoing project aims to search for and study Extremely Metal-Poor (XMP) galaxies in voids, with a focus on estimating oxygen abundance using new methods. So far, 16 void XMP candidates and eight less metal-poor galaxies have been studied, increasing the total number of known galaxies of this type to 19.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2021)
Article
Astronomy & Astrophysics
S. A. Pustilnik, A. L. Tepliakova, Y. A. Perepelitsyna, A. Y. Kniazev, L. N. Makarova, A. N. Burenkov, S. S. Kotov, E. A. Malygin
Summary: KK242 is a LV dwarf of transition type residing in the void environment. Observations indicate a connection between KK242 and Scd galaxy NGC 6503. The radial velocity of KK242 shows differences with that of NGC 6503, suggesting constraints on its origin. Spectra taken from the faint star-forming complex of KK242 reveal the presence of exciting hot stars, probable BHeB and RHeB stars, and a supernova remnant.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2022)
Article
Astronomy & Astrophysics
Justus Neumann, Daniel Thomas, Claudia Maraston, Daniel Goddard, Jianhui Lian, Lewis Hill, Helena Dominguez Sanchez, Mariangela Bernardi, Berta Margalef-Bentabol, Jorge K. Barrera-Ballesteros, Dmitry Bizyaev, Nicholas F. Boardman, Niv Drory, Jose G. Fernandez-Trincado, Richard Lane
Summary: This study analyzes over 2.6 million spatial bins from 7439 nearby galaxies in the SDSS-IV MaNGA survey and identifies a significant relation between mass density and metallicity with contributions from different radial distances. Metallicity increases with radius independently of morphology in low- and intermediate-mass galaxies, while high-mass galaxies only show this radial dependence in high-density regions of spiral galaxies. The findings suggest a driving factor for metallicity that promotes chemical enrichment in the outer parts of galaxies more strongly than in the inner parts, potentially involving scenarios such as gas accretion, outflows, recycling, and radial migration.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2021)
Article
Astronomy & Astrophysics
P. Rodriguez-Beltran, A. Vazdekis, M. Cervino, M. A. Beasley
Summary: The study explores the potential of utilizing surface brightness fluctuations (SBF) for studying composite stellar populations (CSP) by calculating models composed of different mass fractions of two single stellar populations. The findings show that combining mean and SBF values simultaneously leads to improved results in revealing small secondary components in elliptical galaxies.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2021)
Article
Astronomy & Astrophysics
Justus Neumann, Daniel Thomas, Claudia Maraston, Lewis Hill, Lorenza Nanni, Oliver Wenman, Jianhui Lian, Johan Comparat, Violeta Gonzalez-Perez, Kyle B. Westfall, Renbin Yan, Yanping Chen, Guy S. Stringfellow, Matthew A. Bershady, Joel R. Brownstein, Niv Drory, Donald P. Schneider
Summary: This article presents the Mapping Nearby Galaxies at Apache Point Observatory survey (MaNGA) firefly Value Added Catalogue (VAC), which contains spatially resolved stellar population properties of approximately 3.7 million nearby galaxies from the final data release of the MaNGA survey. The study utilizes the spectral fitting code firefly to derive parameters such as stellar ages, metallicities, masses, star formation histories, star formation rates, and dust attenuation. Two variants of the VAC are provided, using different stellar population models, and they show slight differences in stellar ages, metallicities, and color excesses. Additionally, the article compares the stellar masses from firefly with those from other catalogues, finding that firefly masses match best with those from the NSA catalogue.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2022)
Article
Astronomy & Astrophysics
M. Valerdi, J. K. Barrera-Ballesteros, S. F. Sanchez, C. Espinosa-Ponce, L. Carigi, A. Mejia-Narvaez
Summary: By calibrating the emission line flux ratio, the study investigates the abundance of helium and explores its variations in different galaxies through a large sample of H II regions. The observed trends suggest a consistency between the change in helium abundance with respect to oxygen abundance and the chemical enrichment with mass/oxygen abundance.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2021)
Article
Astronomy & Astrophysics
Nimisha Kumari, Roberto Maiolino, James Trussler, Filippo Mannucci, Giovanni Cresci, Mirko Curti, Alessandro Marconi, Francesco Belfiore
Summary: This study extends the Fundamental Metallicity Relation (FMR) to galaxies classified as non-star-forming in the BPT diagrams, finding that galaxies with higher-than-main-sequence SFR are more metal-poor than their counterparts on the main sequence, while low-mass galaxies have higher metallicities than their main sequence counterparts.
ASTRONOMY & ASTROPHYSICS
(2021)
Article
Astronomy & Astrophysics
Tania M. Barone, Francesco D'Eugenio, Nicholas Scott, Matthew Colless, Sam P. Vaughan, Arjen van der Wel, Amelia Fraser-McKelvie, Anna de Graaff, Jesse van de Sande, Po-Feng Wu, Rachel Bezanson, Sarah Brough, Eric Bell, Scott M. Croom, Luca Cortese, Simon Driver, Anna R. Gallazzi, Adam Muzzin, David Sobral, Joss Bland-Hawthorn, Julia J. Bryant, Michael Goodwin, Jon S. Lawrence, Nuria P. F. Lorente, Matt S. Owers
Summary: The study reveals a close correlation between metallicity and the proxy for gravitational potential or escape velocity, while no correlation is found between age and surface density. The results suggest that galaxies formed more compactly at higher redshifts and remained compact throughout their evolution. Additionally, galaxies seem to quench at a characteristic surface density that decreases with decreasing redshift.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2022)
Article
Astronomy & Astrophysics
Timothy Lingard, Karen L. Masters, Coleman Krawczyk, Chris Lintott, Sandor Kruk, Brooke Simmons, William Keel, Robert C. Nichol, Elisabeth Baeten
Summary: The study presents a hierarchical Bayesian approach to galaxy pitch angle determination, finds no correlation between bulge and bar strength and pitch angle, and tests a model for spiral arm winding which suggests most winding spirals disappear at pitch angles larger than 10 degrees.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2021)
Article
Astronomy & Astrophysics
Alex M. Garcia, Paul Torrey, Z. S. Hemler, Lars Hernquist, Lisa J. Kewley, Erica J. Nelson, Kathryn Grasha, Henry R. M. Zovaro, Qian-Hui Chen
Summary: We present radial gas-phase metallicity profiles, gradients, and break radii in star-forming galaxies at redshift z = 0-3 using the TNG50-1 simulation. The profiles reveal a steep inner gradient and a flat outer gradient, with a break radius marking the transition region. We find that the break radius shows a positive trend with mass that weakens with redshift, and when normalized by stellar half-mass radius, the relation with mass and redshift becomes weaker.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2023)
Article
Astronomy & Astrophysics
Xiaokai Chen, Ying Zu, Zhiwei Shao, Huanyuan Shan
Summary: In the investigation of the transition between bright central galaxies (BCGs) and intracluster light (ICL), we have discovered an intriguing transitional component and speculate that the sphere of influence of BCG is related to the escape velocity profile within the characteristic radius of dark matter haloes.
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
Z. S. Hemler, Paul Torrey, Jia Qi, Lars Hernquist, Mark Vogelsberger, Xiangcheng Ma, Lisa J. Kewley, Dylan Nelson, Annalisa Pillepich, Ruediger Pakmor, Federico Marinacci
Summary: The study presents radial gas-phase, mass-weighted metallicity profiles and gradients of the TNG50 star-forming galaxy population at redshifts z = 0-3, finding predominantly negative gradients with a roughly constant growth rate with redshift. While there is a weak correlation between gradient steepness and galaxy stellar mass, this correlation disappears when normalizing the gradients by a characteristic radius defined by the galactic star formation distribution. The study also compares TNG50 gradients with those observed in high-redshift galaxies and highlights the need for simulation models to incorporate more powerful radial gas mixing mechanisms within the ISM to match potential observations from future telescopes like JWST and ELT.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2021)
Article
Astronomy & Astrophysics
Julian S. Goddy, David V. Stark, Karen L. Masters, Kevin Bundy, Niv Drory, David R. Law
Summary: This study compares the observed baryonic Tully-Fisher relation (BTFR) from the MaNGA and HI-MaNGA surveys to a simulated BTFR from the IllustrisTNG simulation. The results show that the BTFRs from MaNGA and IllustrisTNG agree within uncertainties, indicating that IllustrisTNG has successfully created a galaxy population that follows the observed relationship between mass and rotation velocity in the universe.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2023)
Article
Astronomy & Astrophysics
Emily Frank, David V. Stark, Karen Masters, Namrata Roy, Rogerio Riffel, Ivan Lacerna, Rogemar A. Riffel, Dmitry Bizyaev
Summary: This paper investigates the presence and evolutionary consequences of red geysers, a specific type of quiescent galaxy with twin jets. By analyzing the H i gas-to-stellar mass (G/S) ratios of red geysers and non-red geysers, the study finds no statistically significant evidence for a difference in H i content between the two populations.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2023)
Article
Astronomy & Astrophysics
I Lazar, S. Kaviraj, G. Martin, C. Laigle, A. Watkins, R. A. Jackson
Summary: The formation of elliptical galaxies, especially in the low mass regime, is not well understood. This study finds that the formation of low-mass blue ellipticals is not driven by mergers or interactions, but by secular gas accretion. These blue ellipticals reside in low-density environments, further away from nodes and large-scale filaments than other galaxies. Secular gas accretion is likely to play a significant role in the stellar assembly of elliptical galaxies in the low-mass regime.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2023)
Article
Astronomy & Astrophysics
J. K. Jang, Sukyoung K. K. Yi, Yohan Dubois, Jinsu Rhee, Christophe Pichon, Taysun Kimm, Julien Devriendt, Marta Volonteri, Sugata Kaviraj, Sebastien Peirani, Sree Oh, Scott Croom
Summary: Based on recent advancements in numerical simulations of galaxy formation, realistic models of galaxies are expected to be achieved in the near future. However, determining galaxy morphology is still challenging due to differences in observational and simulation methods. In this study, a test was performed on the NewHorizon simulation using high-resolution mock images generated by SKIRT. The results revealed that spectroscopic indicators closely trace the true kinematic structure of galaxies, while photometric indicators often fail, especially for small galaxies. Equations translating between various morphological indicators were provided.
ASTROPHYSICAL JOURNAL
(2023)
Article
Astronomy & Astrophysics
Maxwell Kuschel, Claudia Scarlata, Vihang Mehta, Harry Teplitz, Marc Rafelski, Xin Wang, Ben Sunnquist, Laura Prichard, Norman Grogin, Anton Koekemoer, Rogier Windhorst, Michael Rutkowski, Anahita Alavi, Nima Chartab, Christopher J. Conselice, Y. Sophia Dai, Eric Gawiser, Mauro Giavalisco, Pablo Arrabal Haro, Nimish Hathi, Rolf A. Jansen, Zhiyuan Ji, Ray A. Lucas, Kameswara Mantha, Bahram Mobasher, Robert W. O'Connell, Brant Robertson, Zahra Sattari, L. Y. Aaron Yung, Romeel Dave, Duilia DeMello, Mark Dickinson, Henry Ferguson, Steven L. Finkelstein, Matt Hayes, Justin Howell, Sugata Kaviraj, John W. Mackenty, Brian Siana
Summary: We investigate the environmental quenching process in 0.2 < z < 0.8 groups by analyzing the fraction of quenched galaxies with respect to distance, redshift, and stellar mass. New UV data from the UVCANDELS project and existing photometry are used to derive galaxy properties. Our analysis shows that the probability of quenching increases slowly with decreasing redshift, indicating a dominant process characterized by slow timescales. The estimated quenching time is approximately 4.91(-1.47)(+0.91) Gyr, supporting the theories of strangulation and delayed-then-rapid quenching.
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
A. E. Watkins, H. Salo, S. Kaviraj, C. A. Collins, J. H. Knapen, A. Venhola, J. Roman
Summary: Dwarf galaxies are important cosmological tools, but key parameters such as the relationship between size and mass are still debated. This study re-examines the dwarf population in the Fornax Cluster and finds a population of structural outliers with lower central mass surface density and larger half-light radii, likely formed through tidal disturbances. Comparing these outliers with ultra-diffuse galaxies (UDGs), it is found that the UDG classification lacks discriminatory power.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2023)
Article
Astronomy & Astrophysics
R. S. Beckmann, Y. Dubois, M. Volonteri, C. A. Dong-Paez, M. Trebitsch, J. Devriendt, S. Kaviraj, T. Kimm, S. Peirani
Summary: Although the coevolution of supermassive black holes (SMBHs) with their host galaxies is well established, the evolution of lower-mass black holes, known as intermediate-mass black holes (IMBHs), within their dwarf galaxy hosts is currently unclear. In this paper, the authors present results on the evolution of a large sample of IMBHs from the NEWHORIZON zoom volume. The results show that IMBHs are present in at least 50% of dwarf galaxies with stellar masses down to 10^6 solar masses, but their growth is limited in dwarf galaxies. The difficulties of IMBHs to remain attached to the centers of their host galaxies play an important role in limiting their mass growth, with this dynamic evolution becoming stronger at lower redshifts.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2023)
Article
Astronomy & Astrophysics
Ji Won Park, Simon Birrer, Madison Ueland, Miles Cranmer, Adriano Agnello, Sebastian J. Wagner-Carena, Philip J. Marshall, Aaron Roodman, LSST Dark Energy Sci Collaboration
Summary: This paper presents a Bayesian graph neural network (BGNN) for estimating weak lensing convergence (kappa) from photometric measurements of galaxies along a given line of sight (LOS). The method is particularly useful in strong gravitational time-delay cosmography (TDC), as it characterizes the external convergence (kappa (ext)) from the lens environment and LOS, which is necessary for precise inference of the Hubble constant (H (0)). The BGNN is trained on a large-scale simulation and evaluated on test sets with varying degrees of overlap with the training distribution. The results show that the BGNN accurately recovers the population mean of kappa in well-sampled test fields and extracts a stronger kappa signal compared to a traditional method in sparse sample regions. Therefore, the hierarchical inference pipeline using BGNNs has the potential to improve the characterization of external convergence (kappa (ext)) for precision TDC.
ASTROPHYSICAL JOURNAL
(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)
