Article
Astronomy & Astrophysics
K. Aditya, Peter Kamphuis, Arunima Banerjee, Sviatoslav Borisov, Aleksandr Mosenkov, Aleksandra Antipova, Dmitry Makarov
Summary: Observations and models of the kinematics and distribution of neutral hydrogen in the superthin galaxy FGC 1440 are presented, revealing an asymptotic rotational velocity and the potential presence of a central thick H I disc. Despite its unusually large axial ratio, FGC 1440 shows similarities in the rotational velocity to stellar vertical velocity dispersion ratio compared to other superthin galaxies.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2022)
Article
Astronomy & Astrophysics
S. Katsioli, E. M. Xilouris, C. Kramer, R. Adam, P. Ade, H. Ajeddig, P. Andre, E. Artis, H. Aussel, M. Baes, A. Beelen, A. Benoit, S. Berta, L. Bing, O. Bourrion, M. Calvo, A. Catalano, C. J. R. Clark, I. De Looze, M. De Petris, F. -X. Desert, S. Doyle, E. F. C. Driessen, G. Ejlali, M. Galametz, F. Galliano, A. Gomez, J. Goupy, C. Hanser, A. Hughes, A. P. Jones, F. Keruzore, B. Ladjelate, G. Lagache, S. Leclercq, J. -F. Lestrade, J. -F. Macias-Perez, S. C. Madden, A. Maury, P. Mauskopf, F. Mayet, A. Monfardini, M. Munoz-Echeverria, A. Nersesian, L. Pantoni, D. Paradis, L. Perotto, G. Pisano, N. Ponthieu, V. Reveret, A. J. Rigby, A. Ritacco, C. Romero, H. Roussel, F. Ruppin, K. Schuster, A. Sievers, M. W. L. Smith, J. Tedros, F. Tabatabaei, C. Tucker, N. Ysard, R. Zylka
Summary: This study utilized the NIKA2 camera to observe the galaxy NGC 891 and conducted a detailed investigation of its interstellar medium using data from multiple wavelengths. The results showed that dust, free-free, and synchrotron emissions have different distributions in different emitting regions within the galaxy, and different dusty environments were also identified. The study also found that small dust grains contribute to a certain proportion of the total dust mass, with a higher fraction in the galaxy halo.
ASTRONOMY & ASTROPHYSICS
(2023)
Article
Astronomy & Astrophysics
Adrian Bittner, Adriana de Lorenzo-Caceres, Dimitri A. Gadotti, Patricia Sanchez-Blazquez, Justus Neumann, Paula Coelho, Jesus Falcon-Barroso, Francesca Fragkoudi, Taehyun Kim, Ignacio Martin-Navarro, Jairo Mendez-Abreu, Isabel Perez, Miguel Querejeta, Glenn van de Ven
Summary: Inner bars are common structures in the local Universe and have a significant impact on the nuclear regions of disc galaxies. They exhibit distinct differences in metallicity and [alpha /Fe] abundances compared to the main bars, suggesting that inner bars are scaled down versions of the main bars in galaxies.
ASTRONOMY & ASTROPHYSICS
(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
Dario Fadda, Seppo Laine, Philip N. Appleton
Summary: The new SOFIA [C ii] and ALMA COJ=1 -> 0 observations of NGC 7479 reveal a connection between gas properties and internal interactions in galaxies. Anomalies are observed, possibly related to bubble structures and CO-dark molecular gas.
ASTROPHYSICAL JOURNAL
(2021)
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
S. Comeron
Summary: Thick discs may have formed quickly in situ from turbulent clumpy discs, with thin discs forming slowly within them. Observational tests suggest a positive correlation between the age of the youngest stars in thick discs and the stellar mass of the host galaxy. While field spiral galaxies seem to align with this prediction, lenticular galaxies exhibit younger thick disc ages than expected, indicating a fast early evolution for S0 galaxies.
ASTRONOMY & ASTROPHYSICS
(2021)
Article
Astronomy & Astrophysics
Natascha Sattler, Francesca Pinna, Nadine Neumayer, Jesus Falcon-Barroso, Marie Martig, Dimitri A. Gadotti, Glenn van de Ven, Ivan Minchev
Summary: We trace the evolution of the edge-on spiral galaxy NGC 3501 using deep integral-field spectroscopy MUSE observations. The study presents stellar kinematic and population maps, as well as the star formation history, of the galaxy. The maps reveal a young galaxy with a thicker metal-poor structure and an inner metal-rich one. Comparison of the star formation history suggests the formation of a future massive thin disc embedded in the preexisting thicker disc.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2023)
Article
Astronomy & Astrophysics
Lori E. Porter, Benne W. Holwerda, Sandor Kruk, Maritza Lara-Lopez, Kevin A. Pimbblet, Christopher P. A. Henry, Sarah Casura, Lee S. Kelvin
Summary: The large-scale structure of the Universe consists of galaxy filaments, tendrils, and voids. Voids are underdense regions that make up the majority of the Universe's volume. This study compares void galaxies, which are expected to be isolated, with field galaxies in terms of their physical properties and morphology using data from the GAMA and Galaxy Zoo surveys. The results show that void galaxies are disc-dominated and have predominantly round bulges, in contrast with field galaxies.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2023)
Article
Astronomy & Astrophysics
M. Rubino, A. Pizzella, L. Morelli, L. Coccato, E. Portaluri, V. P. Debattista, E. M. Corsini, E. Dalla Bonta
Summary: This study investigates the kinematic signatures of two large-scale counter-rotating stellar disks using mock integral-field spectroscopic data. The research confirms that the presence of two counter-rotating stellar disks can be identified by the symmetric double peak in the velocity dispersion map, known as the 2 sigma feature. The study also reveals that the counter-rotating kinematic signatures become fainter at lower viewing angles due to the smaller projected velocity separation between the two counter-rotating components.
ASTRONOMY & ASTROPHYSICS
(2021)
Article
Astronomy & Astrophysics
A. Vietri, E. Jarvela, M. Berton, S. Ciroi, E. Congiu, S. Chen, F. Di Mille
Summary: Narrow-line Seyfert 1 (NLS1) galaxies are a peculiar sub-class of active galactic nuclei (AGNe) that are not strictly related to radio-loudness, black hole mass, or host galaxy type. In this study, a radio-quiet NLS1 was found to have the largest double-sided radio jets in the NLS1 class, hosted by a spiral or disc-like galaxy.
ASTRONOMY & ASTROPHYSICS
(2022)
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
Luis G. Dahmer-Hahn, Alberto Rodriguez-Ardila, Marina Bianchin, Rogemar A. Riffel, Rogerio Riffel, Thaisa Storchi-Bergmann, Lei Hao
Summary: Variability studies are an important tool for understanding AGNs. The analysis of the K-band spectral variability of NGC 4388 reveals that the warm dust contribution declined significantly over a 10-year period, suggesting it originates from the innermost part of the AGN torus.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2023)
Article
Astronomy & Astrophysics
Sophia K. Stuber, Eva Schinnerer, Thomas G. Williams, Miguel Querejeta, Sharon Meidt, Eric Emsellem, Ashley Barnes, Ralf S. Klessen, Adam K. Leroy, Justus Neumann, Mattia C. Sormani, Frank Bigiel, Melanie Chevance, Danny Dale, Christopher Faesi, Simon C. O. Glover, Kathryn Grasha, J. M. Diederik Kruijssen, Daizhong Liu, Hsi-an Pan, Jerome Pety, Francesca Pinna, Toshiki Saito, Antonio Usero, Elizabeth J. Watkins
Summary: In this work, the molecular gas distribution of a large sample of nearby main sequence galaxies was visually classified to study their morphology. The classification scheme included different types of bars, spiral arms, and rings, and introduced bar lane classes. The study found that the cold gas-based morphologies matched well with the ones based on stellar light, and that higher mass galaxies were more likely to have bars and grand-design spiral arms. The presence of central or nuclear rings was also observed, especially in barred galaxies.
ASTRONOMY & ASTROPHYSICS
(2023)
Article
Astronomy & Astrophysics
Dhruv Bisaria, Kristine Spekkens, Shan Huang, Gregory Hallenbeck, Martha P. Haynes
Summary: The study presents H alpha velocity maps for HIghMass galaxies obtained with the SITELLE Imaging Fourier Transform Spectrometer, finding UGC 7899 as the best candidate for late gas accretion among the examined galaxies, with hints of inner radial flows or a bar present in UGC 7899 and UGC 9037. However, the constraints on hot-mode accretion models to explain the high H I content in HIghMass galaxies are weak.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2022)