Article
Astronomy & Astrophysics
Hyunjin Jeong, Kyuseok Oh, Seok-Joo Joo, Sukyoung K. Yi
Summary: Based on GALEX UV data and SUSS data, a study characterized the stellar population properties of luminous early-type galaxies, finding that 7.7% of the sample galaxies exhibit recent star formation and tend to be more metal-poor, possibly due to external processes such as mergers or interactions driving the observed star formation activity.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2022)
Article
Astronomy & Astrophysics
Xue Ge, Qiu-Sheng Gu, Ruben Garcia-Benito, Shi-Ying Lu, Cheng-Long Lei, Nan Ding
Summary: This study presents observations of four dwarf lenticular galaxies with multiple star formation regions, showing that these galaxies exhibit significant rotation and follow the Kennicutt-Schmidt law in their star formation processes. The gas-phase metallicities in star-forming regions of these galaxies are lower, indicating that extended star formation may be related to abundant atomic hydrogen, a long dynamic time-scale, and a low-density environment.
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
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
Suraj Dhiwar, Kanak Saha, Avishai Dekel, Abhishek Paswan, Divya Pandey, Arianna Cortesi, Mahadev Pandge
Summary: We studied the evolution of L-* elliptical galaxies in terms of their star formation history and environment in the colour-magnitude diagram to understand their quenching process. We selected 1109 L-* galaxies from a sample of 36,500 galaxies based on visual extraction and spectroscopic selection. Among them, 51 elliptical galaxies were selected based on their surface-brightness profile. Most of the red-sequence and green-valley L-* elliptical galaxies have either recently been quenched or are still forming stars, while the blue-cloud L-* elliptical galaxies are showing vigorous star formation. The galaxy colour is correlated with the cosmic-web environment.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2023)
Article
Astronomy & Astrophysics
A. Capetti, M. Brienza, B. Balmaverde, P. N. Best, R. D. Baldi, A. Drabent, G. Gurkan, H. J. A. Rottgering, C. Tasse, B. Webster
Summary: The properties and origin of radio emission in the most luminous, early-type galaxies in the nearby Universe were studied using observations from the Low-Frequency Array. It was found that there is a positive link between the stellar luminosity of these galaxies and their radio power, detection rate, and fraction of extended sources. The prevalence of compact radio sources and the presence of extended emission were confirmed. Some of the radio emission in these galaxies may be attributed to star forming regions.
ASTRONOMY & ASTROPHYSICS
(2022)
Article
Astronomy & Astrophysics
Jindra Gensior, J. M. Diederik Kruijssen
Summary: In certain conditions, galactic dynamics can suppress star formation and play a significant role in galaxy evolution. The study suggests that dynamical suppression is more effective at low gas fractions and may have an impact in the low redshift and high galaxy mass range.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2021)
Article
Astronomy & Astrophysics
P. Saracco, F. La Barbera, R. De Propris, D. Bevacqua, D. Marchesini, G. De Lucia, F. Fontanot, M. Hirschmann, M. Nonino, A. Pasquali, C. Spiniello, C. Tortora
Summary: We analyzed the stellar ages and metallicities of 70 passive early-type galaxies from the VANDELS survey at redshift 1.0 < z < 1.4 and stellar mass range 10 < log(M-*/M-?) < 11.6. We found systematic variations in the estimates depending on models and wavelength ranges used. Using the full-spectrum fitting technique, we observed that both metallicity and age increase with mass, consistent with local early-type galaxies. The star formation histories revealed that the fraction of stellar mass formed at early epochs increases with galaxy mass.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2023)
Article
Astronomy & Astrophysics
R. Rampazzo, P. Mazzei, A. Marino, L. Bianchi, J. Postma, R. Ragusa, M. Spavone, E. Iodice, S. Ciroi, E. Held
Summary: This study investigates star formation in the actively evolving Dorado group. Using far-UV (FUV) imaging, it is found that young stellar populations exist in early-type galaxies. The results indicate that star formation primarily occurs at the periphery of the galaxy group, with early-type galaxies having a significantly higher star formation rate compared to late-type galaxies.
ASTRONOMY & ASTROPHYSICS
(2022)
Article
Astronomy & Astrophysics
Yu-Zhong Wu, Wei Zhang
Summary: This study analyzes 4615 star-forming early-type galaxies (ETGs) using data from the Galaxy Zoo and Max Planck Institute for Astrophysics-Johns Hopkins University (MPA-JHU) emission-line measurements. It reveals a significant trend of lower/higher stellar mass ETGs having lower/higher star formation rates (SFRs), and establishes a best-fit model for the SFR and stellar mass relationship. The study also highlights the correlation of stellar mass-metallicity (MZ) relation in star-forming ETGs, as well as potential sources for higher metallicity measurements.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2021)
Article
Astronomy & Astrophysics
O. Torbaniuk, M. Paolillo, F. Carrera, S. Cavuoti, C. Vignali, G. Longo, J. Aird
Summary: This study investigates nuclear (AGN) activity in the local Universe and its connection to host galaxy properties. Utilizing the SDSS sample, it was found that 24% of detected sources are efficiently-accreting AGN, primarily hosted by star-forming galaxies. The study also reveals a peak in nuclear activity at very low accretion rates in non-AGN dominated galaxies, with galaxies showing active star formation having higher values of lambda(sBHAR) than quiescent galaxies.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2021)
Article
Astronomy & Astrophysics
Ivan Yu Katkov, Alexei Yu Kniazev, Olga K. Sil'chenko, Damir Gasymov
Summary: The study reveals the presence of ring structures in interstellar matter in S0 galaxies, which differ from star formation in spiral galaxies. Observations of NGC 254 show that the interstellar gas counter-rotates with respect to the stars, indicating an external origin. The gas is believed to have originated from a gas-rich galaxy merger with a retrograde orbit. The counter-rotating gas fuels star formation in two rings within the galaxy. Approximately 1% of the stars in situ are formed from the counter-rotating gas.
ASTRONOMY & ASTROPHYSICS
(2022)
Article
Astronomy & Astrophysics
M. Siudek, K. Lisiecki, J. Krywult, D. Donevski, C. P. Haines, A. Karska, K. Malek, T. Moutard, A. Pollo
Summary: Red ultra-compact massive galaxies called red nuggets were formed at high redshifts (z similar to 2-3). For the first time, we examined the environmental properties of red nuggets at intermediate redshifts (0.5 < z < 0.9) and found consistent fractions across all local densities. Quiescent red nuggets are overabundant in low-density environments, suggesting different survival mechanisms for red nuggets in different environments.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2023)
Article
Astronomy & Astrophysics
Zhiqiang Yan, Tereza Jerabkova, Pavel Kroupa
Summary: A new chemical evolution code was used to reevaluate the star formation timescales of massive elliptical galaxies, finding that more massive galaxies formed faster. This study also showed that lower mass galaxies tend to lose their gas supply more easily.
ASTRONOMY & ASTROPHYSICS
(2021)
Article
Astronomy & Astrophysics
Rodrigo Flores-Freitas, Ana L. Chies-Santos, Cristina Furlanetto, Maria Emilia De Rossi, Leonardo Ferreira, Lucas J. Zenocratti, Karla A. Alamo-Martinez
Summary: In this study, relic galaxy analogues were searched for in the TNG50 cosmological simulations, and five potential relic analogues were found. One of the analogues satisfied most observational constraints and showed similarities to the confirmed relic NGC 1277. However, the brightness and density profiles of the analogues were less steep than those of real relic galaxies. Two formation pathways of relic analogues in TNG50 were identified depending on their environment.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2022)
Article
Astronomy & Astrophysics
Xinzhong Er, Jiangchuan Yu, Adam Rogers, Shihang Liu, Shude Mao
Summary: This study focuses on the impact of plasma lensing on the propagation of radio signals, finding that the cross-section increases with density gradient, but the demagnification effect of plasma lensing leads to underestimation of electron density. There is a high probability of missing high-density clumps and the luminosity function of background sources can be affected.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2022)
Article
Astronomy & Astrophysics
Xinzhong Er, Jenny Wagner, Shude Mao
Summary: Plasma lensing is the refraction of low-frequency electromagnetic rays caused by cold free electrons in the universe, and there is observational evidence of complex plasma structures along the line of sight at cosmological distances, requiring a multi-lens-plane description. By comparing observable parameters such as resolved multiple image positions, relative magnifications, time delays, and pulse shapes, double-plane lenses can be distinguished from single-plane lenses.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2022)
Article
Astronomy & Astrophysics
Shengdong Lu, Dandan Xu, Sen Wang, Zheng Cai, Chuan He, C. Kevin Xu, Xiaoyang Xia, Shude Mao, Volker Springel, Lars Hernquist
Summary: Research shows that the influence of large-scale galaxy environments on the CGM gas angular momentum affects star formation within galaxies, with quenched galaxies having higher angular momenta in their CGM, resulting in less efficient gas inflow.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2022)
Article
Astronomy & Astrophysics
Shengdong Lu, Dandan Xu, Sen Wang, Yunchong Wang, Shude Mao, Xiaoyang Xia, Mark Vogelsberger, Lars Hernquist
Summary: This study investigates the connection between galaxy morphologies, kinematics, and stellar populations, focusing on quenched, bulge-dominated galaxies. By comparing different types of galaxies, the study reveals differences in morphology, evolution paths, and merging histories among these galaxies.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2022)
Article
Astronomy & Astrophysics
Sen Wang, Dandan Xu, Shengdong Lu, Zheng Cai, Maosheng Xiang, Shude Mao, Volker Springel, Lars Hernquist
Summary: In this study, we demonstrate the effect of large-scale galaxy environment on the star formation process. We show that the large-scale environment triggers new episodes of star formation in a star-forming galaxy and modulates the angular momentum of the circumgalactic gas. This synchronized motion of in-flowing and out-flowing gas is regulated by both the large-scale environment and feedback activities from the galaxy center.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2022)
Article
Astronomy & Astrophysics
Y. Wang, E. Athanassoula, P. Patsis, S. Mao
Summary: This study fills the research gap on higher-multiplicity periodic orbits (POs) and extends the application of standard tools. Through a multi-aspect approach, we identify five main pairs of M=2 PO families, some of which exhibit unique symmetries.
ASTRONOMY & ASTROPHYSICS
(2022)
Article
Astronomy & Astrophysics
Rui Guo, Juntai Shen, Zhao-Yu Li, Chao Liu, Shude Mao
Summary: Recent findings indicate that the galaxy is in disequilibrium, with north/south asymmetry and phase mixing signatures. A model incorporating a phase snail and a smooth equilibrium background can quantitatively explain the observed N/S asymmetry. Future observations will further improve our understanding of the phase snail and its correlation with the N/S asymmetry, aiding in the exploration of the Milky Way potential and perturbation history.
ASTROPHYSICAL JOURNAL
(2022)
Article
Astronomy & Astrophysics
Renkun Kuang, Weicheng Zang, Youn Kil Jung, Andrzej Udalski, Hongjing Yang, Shude Mao, Michael D. Albrow, Sun-Ju Chung, Andrew Gould, Cheongho Han, Kyu-Ha Hwang, Yoon-Hyun Ryu, In-Gu Shin, Yossi Shvartzvald, Jennifer C. Yee, Sang-Mok Cha, Dong-Jin Kim, Hyoun-Woo Kim, Seung-Lee Kim, Chung-Uk Lee, Dong-Joo Lee, Yongseok Lee, Byeong-Gon Park, Richard W. Pogge, Przemek Mroz, Jan Skowron, Radoslaw Poleski, Michal K. Szymanski, Igor Soszynski, Pawel Pietrukowicz, Szymon Kozlowski, Krzysztof Ulaczyk, Krzysztof A. Rybicki, Patryk Iwanek, Marcin Wrona, Mariusz Gromadzki, Hanyue Wang, Shuo Huang, Wei Zhu
Summary: This study reports the discovery and analysis of a candidate triple-lens single-source microlensing event. The best fit model includes a planet with a super-Jovian mass and a projected host-planet separation of about 3 au. It is found that the KMTNet sample is incomplete for planets in binary systems, indicating the need for a systematic search for planetary anomalies in KMTNet microlensing light curves of binary systems.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2022)
Article
Astronomy & Astrophysics
Xinzhong Er, Shude Mao
Summary: The number of identified FRBs is expected to increase rapidly, and strongly lensed FRBs are also anticipated to be discovered with significant applications in cosmology and fundamental physics. The radio signal of lensed FRBs will experience deflection by both gravity and plasma, causing frequency-dependent time delays. This phenomenon needs to be considered in future studies, especially at low radio frequencies, and it provides valuable information for the search of lensed FRBs and constraints on the mass and plasma distributions in lens galaxies.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2022)
Article
Astronomy & Astrophysics
Tianjun Gan, Sharon X. X. Wang, Songhu H. Wang, Shude Mao, Chelsea X. X. Huang, Karen A. A. Collins, Keivan G. G. Stassun, Avi Shporer, Wei Zhu, George R. R. Ricker, Roland Vanderspek, David W. W. Latham, Sara Seager, Joshua N. N. Winn, Jon M. M. Jenkins, Khalid Barkaoui, Alexander A. A. Belinski, David R. R. Ciardi, Phil Evans, Eric Girardin, Nataliia A. A. Maslennikova, Tsevi Mazeh, Aviad Panahi, Francisco J. J. Pozuelos, Don J. J. Radford, Richard P. P. Schwarz, Joseph D. D. Twicken, Anael Wuensche, Shay Zucker
Summary: We estimate the occurrence rate of hot Jupiters around early-type M dwarfs based on observations from TESS, and find a lower rate of 0.27% +/- 0.09%.
ASTRONOMICAL JOURNAL
(2023)
Article
Astronomy & Astrophysics
Weicheng Zang, Youn Kil Jung, Hongjing Yang, Xiangyu Zhang, Andrzej Udalski, Jennifer C. Yee, Andrew Gould, Shude Mao, Michael D. Albrow, Sun-Ju Chung, Cheongho Han, Kyu-Ha Hwang, Yoon-Hyun Ryu, In-Gu Shin, Yossi Shvartzvald, Sang-Mok Cha, Dong-Jin Kim, Hyoun-Woo Kim, Seung-Lee Kim, Chung-Uk Lee, Dong-Joo Lee, Yongseok Lee, Byeong-Gon Park, Richard W. Pogge, Przemek Mroz, Jan Skowron, Radoslaw Poleski, Michal K. Szymanski, Igor Soszynski, Pawel Pietrukowicz, Szymon Kozlowski, Krzysztof A. Ulaczyk, Krzysztof Rybicki, Patryk Iwanek, Marcin Wrona, Mariusz Gromadzki, Hanyue Wang, Jiyuan Zhang, Wei Zhu
Summary: This paper presents the analysis of seven microlensing planetary events, revealing that all systems consist of a cold super-Earth orbiting an M or K dwarf. The missing planetary caustics problem in the KMTNet planetary sample has been solved, and a follow-up project for KMTNet high-magnification events could detect more low mass-ratio planets per year.
ASTRONOMICAL JOURNAL
(2023)
Article
Astronomy & Astrophysics
Kai Zhu, Shengdong Lu, Michele Cappellari, Ran Li, Shude Mao, Liang Gao
Summary: This paper presents a catalogue of dynamically determined quantities for over 10,000 nearby galaxies using the MaNGA survey. The dynamical properties are extracted using the JAM method and systematic uncertainties are assessed using eight dynamical models. The catalogue provides quantities related to mass distributions and complete models for each galaxy.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2023)
Article
Astronomy & Astrophysics
Kai Zhu, Ran Li, Xiaoyue Cao, Shengdong Lu, Michele Cappellari, Shude Mao
Summary: This paper derived an empirical aperture correction formula and provided a lookup table of correction factors for different galaxy types. They also provided a Python script to obtain the correction factors from the lookup table.
RESEARCH IN ASTRONOMY AND ASTROPHYSICS
(2023)
Article
Astronomy & Astrophysics
Tianjun Gan, Charles Cadieux, Farbod Jahandar, Allona Vazan, Sharon X. Wang, Shude Mao, Jaime A. Alvarado-Montes, D. N. C. Lin, Etienne Artigau, Neil J. Cook, Rene Doyon, Andrew W. Mann, Keivan G. Stassun, Adam J. Burgasser, Benjamin V. Rackham, Steve B. Howell, Karen A. Collins, Khalid Barkaoui, Avi Shporer, Jerome de Leon, Luc Arnold, George R. Ricker, Roland Vanderspek, David W. Latham, Sara Seager, Joshua N. Winn, Jon M. Jenkins, Artem Burdanov, David Charbonneau, Georgina Dransfield, Akihiko Fukui, Elise Furlan, Michael Gillon, Matthew J. Hooton, Hannah M. Lewis, Colin Littlefield, Ismael Mireles, Norio Narita, Chris W. Ormel, Samuel N. Quinn, Ramotholo Sefako, Mathilde Timmermans, Michael Vezie, Julien de Wit
Summary: Observations and statistical studies have shown the rarity of giant planets around M dwarfs compared with Sun-like stars. In this study, the discovery of TOI-4201b, the most massive and densest hot Jupiter around an M dwarf, is reported. The characteristics of TOI-4201b and the correlation between star metallicity and planet formation are discussed.
ASTRONOMICAL JOURNAL
(2023)
Article
Astronomy & Astrophysics
Youquan Fu, Michele Cappellari, Shude Mao, Shengdong Lu, Kai Zhu, Ran Li
Summary: We analyzed the integral field spectroscopy data of approximately 10,000 galaxies in the final data release of the MaNGA survey. We found 188 galaxies with emission lines that cannot be described by single Gaussian components. These galaxies can be classified into three categories: (1) 38 galaxies with broad H alpha and [O III] lambda 5007 lines, (2) 101 galaxies with broad H alpha lines but no broad [O III] lambda 5007 lines, and (3) 49 galaxies with double-peaked narrow emission lines. Most of the broad-line galaxies are active galactic nuclei (AGNs) according to their line ratios. The catalog provides insights into AGN-galaxy coevolution and the relationship between broad-line properties and host galaxies' dynamical properties.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2023)
