Article
Astronomy & Astrophysics
Peter Erwin, Victor P. Debattista, Stuart Robert Anderson
Summary: This study analyzes the major-axis surface-brightness profiles of 182 barred spiral galaxies using Spitzer 3.6 μm images. The profiles are classified into four categories: 'Peak+Shoulders' (P+Sh), exponential, two-slope, and flat-top. P+Sh profiles are found in galaxies with high stellar masses, early Hubble types, red colors, and low gas fractions. The presence of a boxy/peanut-shaped (B/P) bulge is strongly correlated with high stellar masses. There is a small number of P+Sh profiles in bars without clear B/P bulges, suggesting that P+Sh formation precedes B/P bulge formation.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2023)
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
P. A. Patsis, E. M. Xilouris, J. Alikakos, E. Athanassoula
Summary: The study successfully observed all structural components of the barred spiral galaxy NGC 352, measured their dimensions, and compared the findings with a GADGET N-body model. The X/peanut component was found to be unambiguously part of the bar, with features that are consistent with various theoretical models.
ASTRONOMY & ASTROPHYSICS
(2021)
Article
Astronomy & Astrophysics
T. Manos, Ch Skokos, P. A. Patsis
Summary: The study investigates the evolution of orbital shapes at the inner Lindblad resonance region of a rotating 3D bar with increasing mass over time. It shows that orbits with specific initial conditions play a crucial role in supporting peanut-like structures, most of which have a regular or weakly chaotic character. These orbital patterns persist for longer times in more massive models.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2022)
Article
Astronomy & Astrophysics
Polychronis Papaderos, Goeran Oestlin, Iris Breda
Summary: The spectral energy distribution of galaxies varies both between galaxies and within them. When observing redshifted galaxies, a correction called k correction is commonly applied to account for the relative dimming or brightening. The morphological appearance of galaxies also changes with redshift due to the spatially non-homogeneous spectral energy distribution.
ASTRONOMY & ASTROPHYSICS
(2023)
Article
Astronomy & Astrophysics
Iris Breda, Polychronis Papaderos
Summary: This study investigates the star formation history of late-type galaxies and finds that the formation and evolution of bulges and disks are continuous, contrary to previous theories. The results support the inside-out growth model where bulges are formed simultaneously with their parent disks and show that high-mass galaxies have shorter formation timescales compared to low-mass galaxies.
ASTRONOMY & ASTROPHYSICS
(2023)
Article
Astronomy & Astrophysics
Si-Yue Yu, Dewang Xu, Luis C. Ho, Jing Wang, Wei-Bo Kao
Summary: Spiral-driven instabilities contribute to gas inflow and enhance central star formation in disk galaxies. Stronger spiral arms are associated with more intense central star formation rates and an increased fraction of pseudo bulges, while the fraction of quenched classical bulges decreases.
ASTRONOMY & ASTROPHYSICS
(2022)
Article
Astronomy & Astrophysics
Ankit Kumar, Mousumi Das, Sandeep Kumar Kataria
Summary: Galaxy flybys and mergers are common occurrences in the low-redshift Universe, with flybys playing a significant role in the exchange of mass and energy between galaxies. This study investigated the impact of minor flybys on Milky Way mass galaxies, focusing on the bulges, discs, and spiral arms. While flybys resulted in disc thickening and increased dynamism in pseudo-bulges, they had little effect on non-rotating classical bulges.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2021)
Article
Astronomy & Astrophysics
Takafumi Tsukui, Emily Wisnioski, Mark R. Krumholz, Andrew Battisti
Summary: We present spatially resolved dust properties of the quasar host galaxy BRI1335-0417 at redshift z = 4.4 based on Atacama Large Millimetre/submillimetre Array (ALMA) observations. The dust temperature map obtained from a greybody fit to continuum images shows a steep increase towards the center and a flat median profile at the outer regions. Image decomposition analysis reveals a point source in both dust continuum images, which corresponds to warm dust heated by an active galactic nucleus (AGN). The inclusion of a warm component along with cooler dust heated by star formation provides a better fit to the global spectral energy distribution compared to a single-component model.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2023)
Article
Astronomy & Astrophysics
Dominic Smith, Lutz Haberzettl, L. E. Porter, Ren Porter-Temple, Christopher P. A. Henry, Benne Holwerda, A. R. Lopez-Sanchez, Steven Phillipps, Alister W. Graham, Sarah Brough, Kevin A. Pimbblet, Jochen Liske, Lee S. Kelvin, Clayton D. Robertson, Wade Roemer, Michael Walmsley, David O'Ryan, Tobias Geron
Summary: This study compares the morphology of galaxies in the green valley with those in the red sequence and blue cloud using the Galaxy And Mass Assembly (GAMA) database and the Galaxy Zoo citizen science morphological estimates. The results show that ring structures are more commonly found in green-valley galaxies compared to their red and blue counterparts.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2022)
Article
Astronomy & Astrophysics
J. Mendez-Abreu, A. de Lorenzo-Caceres, S. F. Sanchez
Summary: The study reveals differences in the mass-size relation between bulges and discs in high-mass galaxies, as well as a correlation between the Sersic index of bulges and both galaxy and bulge mass. The results support an inside-out formation of nearby non-barred galaxies and suggest that early properties of bulges influence the future evolution of the galaxy.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2021)
Article
Astronomy & Astrophysics
Peter Erwin, Anil Seth, Victor P. Debattista, Marja Seidel, Kianusch Mehrgan, Jens Thomas, Roberto Saglia, Adriana De Lorenzo-Caceres, Witold Maciejewski, Maximilian Fabricius, Jairo Mendez-Abreu, Ulrich Hopp, Matthias Kluge, John E. Beckman, Ralf Bender, Niv Drory, Deanne Fisher
Summary: The study analyzes the detailed morphological, photometric, and stellar kinematic features of the central regions of two massive, early-type barred galaxies. NGC 4608 exhibits a classical bulge and a nuclear star cluster, while NGC 4643 has a nuclear disc and a small spheroidal component. Both galaxies show distinct structures in their central regions, highlighting the limitations of standard bulge-disc decompositions when applied to massive barred galaxies.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2021)
Article
Astronomy & Astrophysics
Masafumi Noguchi
Summary: The formation of galactic bulges is still not fully understood, with one proposed mechanism suggesting that they form from cold gas inflowing through hot halo gas in massive dark matter haloes at high redshifts. This scenario results in the bulge-to-total stellar mass ratio increasing with galaxy mass, consistent with observations. Additionally, it is found that the mean stellar age of bulges increases with galaxy mass while the age gradient across the bulge decreases, indicating different origins for bulges in higher and lower mass galaxies.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2022)
Article
Astronomy & Astrophysics
Evelyn J. Johnston, Boris Haussler, Keerthana Jegatheesan
Summary: Studying the components of galaxies is crucial for understanding their evolution. The BUDDI-MaNGA project aims to explore the evolution and morphological transformations of galaxies through the star-formation histories of their bulges and discs. This project provides the largest sample of clean bulge and disc spectra extracted from IFU datacubes, which will contribute to answering questions about galaxy formation and evolution.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2022)
Article
Astronomy & Astrophysics
Virginia Cuomo, Victor P. Debattista, Sarah Racz, Stuart Robert Anderson, Peter Erwin, Oscar A. Gonzalez, J. W. Powell, Enrico Maria Corsini, Lorenzo Morelli, Mark A. Norris
Summary: The short-lived buckling instability is responsible for the formation of some box/peanut (B/P) shaped bulges in barred galaxies, while other B/P bulges form through resonant trapping of stars. The difference lies in the symmetry breaking during buckling, which creates residual mid-plane asymmetry. Simulations and diagnostic tests on galaxies indicate that B/P bulges formed through strong buckling are rare in the past 5 billion years. Mid-plane asymmetry is not observed in galaxies with B/P bulges, suggesting either resonant trapping or buckling events more than 5 Gyr ago as the formation mechanisms.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2023)
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
William C. C. Keel, Rogier A. A. Windhorst, Rolf A. A. Jansen, Seth H. H. Cohen, Jake Summers, Benne Holwerda, Sarah T. T. Bradford, Clayton D. D. Robertson, Giovanni Ferrami, Stuart Wyithe, Haojing Yan, Christopher J. J. Conselice, Simon P. P. Driver, Aaron Robotham, Norman A. A. Grogin, Christopher N. A. Willmer, Anton M. M. Koekemoer, Brenda L. L. Frye, Nimish P. P. Hathi, Russell E. E. Ryan Jr, Nor Pirzkal, Madeline A. A. Marshall, Dan Coe, Jose M. M. Diego, Thomas J. J. Broadhurst, Michael J. J. Rutkowski, Lifan Wang, S. P. Willner, Andreea Petric, Cheng Cheng, Adi Zitrin
Summary: We measured the spatial and wavelength behavior of dust attenuation in the multiple-armed spiral galaxy VV 191b using backlighting by the superimposed elliptical system VV 191a. The imaging data revealed the attenuation profiles and coverage statistics in different wavelength bands, showing a stronger reddening behavior and a power-law extinction behavior with different slopes at different wavelengths. These results indicate a different grain population compared to our vicinity.
ASTRONOMICAL 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)