Article
Astronomy & Astrophysics
Madison Smith, L. van Zee, S. Salim, D. Dale, S. Staudaher, T. Wrock, A. Maben
Summary: By fitting spectral energy distributions of nearby galaxies, this study examines the star formation histories and rate tracers at different scales. The analysis of brightness profiles and radial SED fitting reveals population gradients in stellar discs and haloes. The results show a wide variety of star formation gradients and average stellar age distributions in these galaxies.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2021)
Article
Astronomy & Astrophysics
Madison Smith, L. van Zee, D. A. Dale, S. Staudaher, T. Wrock
Summary: This study investigates the trends in star formation and star formation history in nine nearby late-type spiral galaxies using multiwavelength observations. The radial trends and clustering of UV-selected sources are analyzed, revealing evidence for hierarchical star formation and clustering on scales of several kiloparsecs. The study also suggests that spiral arms play a role in organizing star formation even in regions with low surface brightness in a galaxy.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2022)
Article
Astronomy & Astrophysics
L. Ciesla, V Buat, M. Boquien, A. Boselli, D. Elbaz, G. Aufort
Summary: The study demonstrates that galaxies experiencing rapid quenching exhibit different timescales for the decrease in infrared luminosity, with HRS galaxies showing longer timescales and COSMOS galaxies showing shorter timescales.
ASTRONOMY & ASTROPHYSICS
(2021)
Article
Astronomy & Astrophysics
Jarle Brinchmann
Summary: I analyzed the JWST NIRSpec data of SMACS 0723 and provided three new redshifts, bringing the total reliable redshifts to 14. I proposed a modified direct abundance determination method that reduces sensitivity to flux calibration uncertainties by a factor of about 3 and showed that the resulting abundances are consistent with Bayesian photoionization models. I identified a narrow-line active galactic nucleus (AGN) at z = 7.66 and suggested the possibility of AGN contribution to the flux of another object at 10 612 through comparison with photoionization models and low-redshift analogues.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2023)
Article
Astronomy & Astrophysics
L. Ciesla, C. Gomez-Guijarro, V. Buat, D. Elbaz, S. Jin, M. Bethermin, E. Daddi, M. Franco, H. Inami, G. Magdis, B. Magnelli, M. Xiao
Summary: Recently, a population of compact main sequence (MS) galaxies exhibiting starburst-like properties were identified in the GOODS-ALMA blind survey. This study aims to understand the star formation history (SFH) of these galaxies and compare them to normal GOODS-ALMA galaxies. The results show that despite their different properties, SBs in the MS galaxies have similar recent SFHs as normal galaxies, suggesting a diversity of galaxies within a complex main sequence.
ASTRONOMY & ASTROPHYSICS
(2023)
Article
Astronomy & Astrophysics
Madison Smith, L. van Zee, D. A. Dale, L. C. Hunter, S. Staudaher, T. Wrock
Summary: This study presents global, radial, and local photometric measurements of several nearby low-mass galaxies. It uses multiwavelength observations to trace the distributions of old and young stars and derive their star formation histories. The results show that bluer UV sources in galaxies with recent star formation are clustered on smaller scales, while the reddest UV sources are not clustered on any scale. Additionally, a negative radial gradient in the star formation history parameter is found, indicating inside-out growth of galactic discs.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2022)
Article
Astronomy & Astrophysics
J. K. Barrera-Ballesteros, S. F. Sanchez, T. Heckman, T. Wong, A. Bolatto, E. Ostriker, E. Rosolowsky, L. Carigi, S. Vogel, R. C. Levy, D. Colombo, Yufeng Luo, Yixian Cao
Summary: The study reveals a tight correlation between star formation rate density Σ(SFR) and hydrostatic mid-plane pressure P-h, with an increase in effective feedback momentum per unit stellar mass (p(*) / m(*)) in actively star-forming regions as P-h increases. There is a significant negative correlation with total stellar mass, stellar age, and metallicity.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2021)
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
G. Mountrichas, V Buat, G. Yang, M. Boquien, D. Burgarella, L. Ciesla, K. Malek, R. Shirley
Summary: The study compares the star-formation rate (SFR) of approximately 1800 X-ray active galactic nuclei (AGN) to non-AGN star-forming systems in the eROSITA Final Equatorial-Depth Survey (eFEDS). Results show that AGN with low and moderate X-ray luminosity have lower SFR compared to star-forming galaxies, while at higher X-ray luminosity, the SFR of AGN may be enhanced. This enhancement is particularly pronounced for massive AGN hosts.
ASTRONOMY & ASTROPHYSICS
(2022)
Article
Astronomy & Astrophysics
David Perez-Millan, Jacopo Fritz, Rosa A. Gonzalez-Lopezlira, Alessia Moretti, Bernardo Cervantes Sodi, Benedetta Vulcani, Marco Gullieuszik, Gustavo Bruzual, Stephane Charlot, Daniela Bettoni
Summary: Observed properties of galaxies are influenced by their total stellar mass and morphology, as well as the environment. This study uses spectrophotometric data from the WINGS and OmegaWINGS surveys to investigate both the local and large-scale environmental effects on star formation activity in clusters. Comparisons with field galaxies reveal that local effects have a stronger impact on galaxy properties, highlighting the importance of considering morphology in understanding the influence of clusters on galaxy evolution.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2023)
Article
Astronomy & Astrophysics
R. M. Gonzalez Delgado, J. E. Rodriguez-Martin, L. A. Diaz-Garcia, A. de Amorim, R. Garcia-Benito, G. Martinez-Solaeche, P. A. A. Lopes, M. Maturi, E. Perez, R. Cid Fernandes, A. Cortesi, A. Finoguenov, E. R. Carrasco, A. Hernan-Caballero, L. R. Abramo, J. Alcaniz, N. Benitez, S. Bonoli, A. J. Cenarro, D. Cristobal-Hornillos, J. M. Diego, R. A. Dupke, A. Ederoclite, J. A. Fernandez-Ontiveros, C. Lopez-Sanjuan, A. Marin-Franch, I Marquez, C. Mendes de Oliveira, M. Moles, I Pintos, L. Sodre, K. Taylor, J. Varela, H. Vazquez Ramio, J. M. Vilchez
Summary: This study demonstrates the potential of J-PAS in detecting and characterizing galaxy populations within galaxy clusters, showing that the proportion of red and quiescent galaxies in clusters increases with stellar mass, while the abundance excess of transition galaxies is modest at lower stellar masses.
ASTRONOMY & ASTROPHYSICS
(2022)
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
Francesco Belfiore, Adam K. Leroy, Jiayi Sun, Ashley T. Barnes, Mederic Boquien, Yixian Cao, Enrico Congiu, Daniel A. Dale, Oleg V. Egorov, Cosima Eibensteiner, Simon C. O. Glover, Kathryn Grasha, Brent Groves, Ralf S. Klessen, Kathryn Kreckel, Lukas Neumann, Miguel Querejeta, Patricia Sanchez-Blazquez, Eva Schinnerer, Thomas G. Williams
Summary: Mapping star-formation rates (SFR) within galaxies is key to understanding their assembly and evolution. This study used integral field spectroscopy to derive accurate SFR distributions on kiloparsec scales in nearby galaxies. The findings suggest that previous hybrid recipes for calculating SFR overestimate values in regions with low SFR surface density, low specific star-formation rate, low attenuation, and old stellar ages due to the heating of dust by old stellar populations. These calibrations prove reliable and can be applied to different physical scales. Rating: 8/10
ASTRONOMY & ASTROPHYSICS
(2023)
Article
Astronomy & Astrophysics
C. Murugeshan, V. A. Kilborn, B-Q For, O. Wong, J. Wang, T. Westmeier, A. R. H. Stevens, K. Spekkens, P. Kamphuis, L. Staveley-Smith, K. Lee-Waddell, D. Kleiner, B. S. Koribalski, M. E. Cluver, S-H Oh, J. Rhee, B. Catinella, T. N. Reynolds, H. Denes, A. Elagali
Summary: Using high-resolution ASKAP observations of galaxies in the Eridanus supergroup, we studied their HI, angular momentum, and star formation properties, finding consistency with previous works. Environmental processes, such as tidal interactions, were found to significantly impact the relationship between atomic gas fraction and integrated atomic disc stability parameter in Eridanus galaxies. The majority of Eridanus galaxies were also found to be HI deficient compared to normal star-forming galaxies in the field, with indications of suppression in star formation due to their environment.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2021)
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
Jose G. Fernandez-Trincado, Sandro Villanova, Doug Geisler, Beatriz Barbuy, Dante Minniti, Timothy C. Beers, Szabolcs Meszaros, Baitian Tang, Roger E. Cohen, Cristian Moni Bidin, Elisa R. Garro, Ian Baeza, Cesar Munoz
Summary: This study presents the results of the investigation on the intermediate-metallicity globular cluster FSR 1758 using high-resolution near-infrared spectra. The research confirms the cluster nature of FSR 1758 and reveals the existence of multiple stellar populations. The study suggests that FSR 1758 is unlikely to be the remnant nucleus of a dwarf galaxy.
ASTRONOMY & ASTROPHYSICS
(2022)
Article
Astronomy & Astrophysics
Dominic J. Taylor, Andrew C. Mason, Ricardo P. Schiavon, Danny Horta, David M. Nataf, Doug Geisler, Shobhit Kisku, Sian G. Phillips, Roger E. Cohen, Jose G. Fernandez-Trincado, Timothy C. Beers, Dmitry Bizyaev, Domingo Anibal Garcia-Hernandez, Richard R. Lane, Penelope Longa-Pena, Dante Minniti, Cesar Munoz, Kaike Pan, Sandro Villanova
Summary: Research suggests that Terzan 5 is not a remnant of a major building block of the Milky Way bulge. Differences in abundance between the stars of Terzan 5 and the bulge stars indicate that Terzan 5 is not a significant contributor to the chemical properties of the bulge/inner disk.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2022)
Article
Astronomy & Astrophysics
Carlos G. Roman-Zuniga, Marina Kounkel, Jesus Hernandez, Karla Pena Ramirez, Ricardo Lopez-Valdivia, Kevin R. Covey, Amelia M. Stutz, Alexandre Roman-Lopes, Hunter Campbell, Elliott Khilfeh, Mauricio Tapia, Guy S. Stringfellow, Juan Jose Downes, Keivan G. Stassun, Dante Minniti, Amelia Bayo, Jinyoung Serena Kim, Genaro Suarez, Jason E. Ybarra, Jose G. Fernandez-Trincado, Penelope Longa-Pena, Valeria Ramirez-Preciado, Javier Serna, Richard R. Lane, D. A. Garcia-Hernandez, Rachael L. Beaton, Dmitry Bizyaev, Kaike Pan
Summary: The primary goal of the Sloan Digital Sky Survey IV APOGEE-2 was to observe red giant stars in the Galaxy and study their dynamics, morphology, and chemical evolution. In addition, the study also identified a sample of young stars in star-forming regions and young open clusters and determined six stellar properties for them. This study serves as a foundation for future studies on individual regions and global properties of stars in the pre-main-sequence phase.
ASTRONOMICAL JOURNAL
(2023)
Article
Astronomy & Astrophysics
Elisa R. Garro, Jose G. Fernandez-Trincado, Dante Minniti, Wisthon H. Moya, Tali Palma, Timothy C. Beers, Vinicius M. Placco, Beatriz Barbuy, Chris Sneden, Alan Alves-Brito, Bruno Dias, Melike Afsar, Heinz Frelijj, Richard R. Lane
Summary: This study uses the latest data from the Gaia mission and VVVX measurements to calculate the orbits of nearly a dozen poorly studied or unexplored star clusters. The results indicate that some belong to the Galactic disk while others may be part of the Galactic bulge or halo. The origin of VVV-CL160 remains unclear.
ASTRONOMY & ASTROPHYSICS
(2023)
Article
Astronomy & Astrophysics
Baitian Tang, Jiajun Zhang, Zhiqiang Yan, Zhiyu Zhang, Leticia Carigi, Jose G. Fernandez-Trincado
Summary: By studying the high-resolution O, Si, and Al abundances in 43 giant stars of the Sculptor dwarf galaxy using near-infrared APOGEE spectra, we confirm the trend of lower [alpha/Fe] in less massive galaxies. The low [Al/Fe] in Sculptor demonstrates its value in identifying stars born in dwarf galaxies rather than the Milky Way field stars.
ASTRONOMY & ASTROPHYSICS
(2023)
Article
Astronomy & Astrophysics
Hunter Campbell, Elliott Khilfeh, Kevin R. Covey, Marina Kounkel, Richard Ballantyne, Sabrina Corey, Carlos G. Roman-Zuniga, Jesus Hernandez, Ezequiel Manzo Martinez, Karla Pena Ramirez, Alexandre Roman-Lopes, Keivan G. Stassun, Guy S. Stringfellow, Jura Borissova, S. Drew Chojnowski, Valeria Ramirez-Preciado, Jinyoung Serena Kim, Javier Serna, Amelia M. Stutz, Ricardo Lopez-Valdivia, Genaro Suarez, Jason E. Ybarra, Penelope Longa-Pena, Jose G. Fernandez-Trincado
Summary: Very young stars with strong magnetic fields channel ionized gas from their circumstellar disks to their surfaces, emitting hydrogen spectral lines upon impact. We measured the equivalent widths of Brackett emission lines in 1101 APOGEE spectra of 326 pre-main sequence accretors to determine the density and temperature of the gas in these accretion streams. Our measurements and model fitting show that the electron density ranges from 10^11 to 10^12 cm^-3, and the excitation temperature is inversely correlated with the electron density, ranging from 5000 K to 12,500 K.
ASTROPHYSICAL JOURNAL
(2023)
Article
Astronomy & Astrophysics
Yue Wang, Baitian Tang, Chengyuan Li, Holger Baumgardt, Ricardo R. Munoz, Jose G. Fernandez-Trincado, Doug Geisler, Yuanqing Fang
Summary: Multiple populations with variations in light elemental abundances have been found in stellar clusters. Mass has been suggested as a key parameter affecting the presence and appearance of multiple populations. This study investigates the existence of multiple populations in low-mass clusters and explores the mass threshold for their formation.
ASTROPHYSICAL JOURNAL
(2023)
Article
Astronomy & Astrophysics
T-Y Cheng, H. Dominguez Sanchez, J. Vega-Ferrero, C. J. Conselice, M. Siudek, A. Aragon-Salamanca, M. Bernardi, R. Cooke, L. Ferreira, M. Huertas-Company, J. Krywult, A. Palmese, A. Pieres, A. A. Plazas Malagon, A. Carnero Rosell, D. Gruen, D. Thomas, D. Bacon, D. Brooks, D. J. James, D. L. Hollowood, D. Friedel, E. Suchyta, E. Sanchez, F. Menanteau, F. Paz-Chinchon, G. Gutierrez, G. Tarle, I Sevilla-Noarbe, I Ferrero, J. Annis, J. Frieman, J. Garcia-Bellido, J. Mena-Fernandez, K. Honscheid, K. Kuehn, L. N. da Costa, M. Gatti, M. Raveri, M. E. S. Pereira, M. Rodriguez-Monroy, M. Smith, M. Carrasco Kind, M. Aguena, M. E. C. Swanson, N. Weaverdyck, P. Doel, R. Miquel, R. L. C. Ogando, R. A. Gruendl, S. Allam, S. R. Hinton, S. Dodelson, S. Bocquet, S. Desai, S. Everett, V Scarpine
Summary: This article compares two largest galaxy morphology catalogues, which classify early- and late-type galaxies at intermediate redshift. The catalogues were built using deep learning (CNNs) applied to Dark Energy Survey data. Despite methodological differences, the agreement between the two catalogues is excellent up to i < 19, showing reliable CNN predictions for samples one magnitude fainter than the training sample limit.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2023)
Article
Astronomy & Astrophysics
A. B. A. Queiroz, F. Anders, C. Chiappini, A. Khalatyan, B. X. Santiago, S. Nepal, M. Steinmetz, C. Gallart, M. Valentini, M. Dal Ponte, B. Barbuy, A. Perez-Villegas, T. Masseron, J. G. Fernandez-Trincado, S. Khoperskov, I. Minchev, E. Fernandez-Alvar, R. R. Lane, C. Nitschelm
Summary: The Gaia mission has provided valuable astrometric data for over a billion stars, giving comprehensive information about the Milky Way. By using the Bayesian isochrone-fitting code StarHorse, distances and extinctions were calculated for millions of stars listed in Gaia Data Release 3 and public spectroscopic surveys. The precision of distance and extinction measurements was improved by using StarHorse.
ASTRONOMY & ASTROPHYSICS
(2023)
Article
Astronomy & Astrophysics
Lorenza Nanni, Daniel Thomas, James Trayford, Claudia Maraston, Justus Neumann, David R. Law, Lewis Hill, Annalisa Pillepich, Renbin Yan, Yanping Chen, Dan Lazarz
Summary: Strengthening the synergy between simulations and observations is crucial for testing galaxy formation and evolution theories. In this study, we introduce a method to generate mock observations from cosmological simulations to mimic the SDSS-IV/MaNGA-Primary sample selection. The comparison between the iMaNGA sample and the MaNGA Primary catalogue shows that the iMaNGA sample successfully recovers the stellar mass versus angular size relation and spatial resolution. However, the simulations do not reproduce the Sersic index versus angular size relation well, mainly due to a lack of high-mass elliptical galaxies.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2023)
Article
Astronomy & Astrophysics
Gianluca Pagliaro, Maria Alessandra Papa, Jing Ming, Jianhui Lian, Daichi Tsuna, Claudia Maraston, Daniel Thomas
Summary: We study the prospects for detecting continuous gravitational signals from normal Galactic neutron stars. We use a synthetic population generated by evolving stellar remnants and consider the constraints set by previous searches for gravitational waves. We find that neutron stars with magnetic deformations alone cannot produce detectable signals, and third-generation detectors will be able to detect more sources.
ASTROPHYSICAL JOURNAL
(2023)
Article
Astronomy & Astrophysics
Mario Soto, Konrad Kuijken, R. Michael Rich, William Clarkson, Jose Luis Nilo Castellon, Jose G. Fernandez-Trincado, Rodrigo Contreras Ramos, Andrea Kunder, Laura D. Baravalle, M. Victoria Alonso, Iulia T. Simion, Christian Johnson, Katherine Vieira
Summary: This paper is part of a series aiming to identify clear features of the Galactic bar/bulge by observing the kinematic characteristics of bulge stellar populations in areas with low foreground extinction. The authors report the discovery of approximately 100,000 new proper motions in four fields located on the far side of the Galactic bar/bulge, specifically at negative longitudes. The proper motions were obtained using the Advance Camera for Surveys (ACS) on the Hubble Space Telescope (HST) with a time-baseline of 8-9 years, resulting in accuracies better than 0.5 mas yr(-1) for a significant portion of the stellar populations with F814W < 23 mag. The observations show a remarkably similar proper motion distribution to fields closer to the Galactic center and consistent with an old stellar population, indicating a significant rotation of the bulge even in areas as far as l≈-8°, as well as changes in the velocity ellipsoid in the l, b plane with respect to distance.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2023)
Article
Astronomy & Astrophysics
B. Barbuy, A. C. S. Friaca, H. Ernandes, T. Moura, T. Masseron, K. Cunha, V. V. Smith, D. Souto, A. Perez-Villegas, S. O. Souza, C. Chiappini, A. B. A. Queiroz, J. G. Fernandez-Trincado, P. da Silva, B. X. Santiago, F. Anders, R. P. Schiavon, M. Valentini, D. Minniti, D. Geisler, V. M. Placco, M. Zoccali, M. Schultheis, C. Nitschelm, T. C. Beers, R. Razera
Summary: This article investigates the abundance variations of sodium and aluminum in a sample of low metallicity stars and analyzes their behavior by comparing with chemodynamical models. The results show a significant spread in sodium abundance, while aluminum displays a nearly secondary-element behavior, and these stars are not identified as second-generation stars from globular clusters.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2023)
Article
Astronomy & Astrophysics
Ilya Straumit, Andrew Tkachenko, Sarah Gebruers, Jeroen Audenaert, Maosheng Xiang, Eleonora Zari, Conny Aerts, Jennifer A. Johnson, Juna A. Kollmeier, Hans-Walter Rix, Rachael L. Beaton, Jennifer L. Van Saders, Johanna Teske, Alexandre Roman-Lopes, Yuan-Sen Ting, Carlos G. Roman-Zuniga
Summary: The Sloan Digital Sky Survey (SDSS) has initiated its fifth survey generation (SDSS-V) which focuses on stellar spectroscopy. SDSS-V's Milky Way Mapper program will provide optical and near-infrared spectra for over 5 x 10(6) stars, allowing analysis of stellar mass, temperature, evolutionary stage, and age. This study presents the spectral analysis algorithm, ZETA-PAYNE, specifically designed for analyzing spectra of hot stars with OBAF spectral types.
ASTRONOMICAL JOURNAL
(2022)