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Astronomy & Astrophysics
Eric W. Koch, Erik W. Rosolowsky, Adam K. Leroy, Jeremy Chastenet, I-Da Chiang, Julianne Dalcanton, Amanda A. Kepley, Karin M. Sandstrom, Andreas Schruba, Sneiana Stanimirovie, Dyas Utomo, Thomas G. Williams
Summary: Previous estimates of galaxy atomic gas mass from 21-cm HI emission are systematically low and require correction due to the presence of a cold opaque atomic gas component. New observations show a preference for a multiple-component Gaussian model over a single opacity-corrected model, challenging previous assumptions. Further studies are needed to better understand the implications of these findings on the opaque atomic ISM mass and HI surface density relationships.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2021)
Article
Astronomy & Astrophysics
Joshua Peltonen, Erik Rosolowsky, L. Clifton Johnson, Anil C. Seth, Julianne Dalcanton, Eric F. Bell, Jonathan Braine, Eric W. Koch, Margaret Lazzarini, Adam K. Leroy, Evan D. Skillman, Adam Smercina, Tobin Wainer, Benjamin F. Williams
Summary: By comparing young clusters and GMCs in M33 and M31, we can constrain temporal and spatial scales in the star formation process. Young clusters show a high probability of being near other young clusters, while the correlation between GMCs is suppressed by the cloud identification algorithm. Younger clusters are found to be closer to GMCs than older clusters. The total lifetime of the GMCs in M33 is estimated to be approximately 11-15 million years.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2023)
Article
Astronomy & Astrophysics
S. P. Phiri, J. M. Kirk, D. Ward-Thompson, A. E. Sansom, G. J. Bendo
Summary: ALMA observations of NGC 604, a giant Hii region in M33, reveal spatial offsets and size characteristics of molecular clouds, indicating near virial equilibrium of the clouds with a high spearman correlation coefficient. The linewidth-size relationship of these clouds is found to be offset from the corresponding relations for the Milky Way and NGC 300, potentially due to the dendrogram process.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2021)
Article
Astronomy & Astrophysics
G. Athikkat-Eknath, S. A. Eales, M. W. L. Smith, A. Schruba, K. A. Marsh, A. P. Whitworth
Summary: This study investigates the radial variations of the dust emissivity index (beta) in the Andromeda Galaxy using observations and dust maps. The results confirm the previously observed beta variations, but show little difference in beta between molecular clouds and their surroundings, contradicting current models. Some dust clouds with little CO detection are also identified.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2022)
Article
Astronomy & Astrophysics
Dayi Li, Pauline Barmby
Summary: The study demonstrates the power of Gibbs point process models in analyzing the spatial distributions of objects in the star formation complexes of resolved galaxies, revealing the high correlation between GMCs and YSCCs. The spatial distribution of YSCCs exhibits a clustering pattern with a peak at about 250pc scale, mainly in regions with galactocentric distance greater than 4.5kpc. The properties of GMCs, such as galactocentric distance and mass, have a strong positive effect on the correlation strength between GMCs and YSCCs.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2021)
Article
Astronomy & Astrophysics
Subhashis Roy, Souvik Manna
Summary: Observations of seven nearby large-angular-sized galaxies at 0.33 GHz revealed a trend of flat spectral indices at galaxy centers shifting to steeper indices with increasing galactocentric distances. Analysis of radio-FIR correlation using MIPS 70-mu m data indicated reduced correlation at 0.33 GHz due to cosmic-ray electron propagation. Simple isotropic diffusion model could explain effects for only two galaxies, while streaming instability could account for results in most remaining galaxies.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2021)
Article
Astronomy & Astrophysics
M. Relano, I De Looze, A. Saintonge, K-C Hou, L. E. C. Romano, K. Nagamine, H. Hirashita, S. Aoyama, I Lamperti, U. Lisenfeld, M. W. L. Smith, J. Chastenet, T. Xiao, Y. Gao, M. Sargent, S. A. van der Giessen
Summary: This study analyzes the spectral energy distribution of a large sample of galaxies and investigates the evolution of dust grain size distribution. It finds that the observed distribution is generally consistent with simulations, but there are some massive galaxies deviating from the predictions. The inclusion of diffusion mechanism could explain the observed deviations.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2022)
Article
Astronomy & Astrophysics
M. Romano, A. Nanni, D. Donevski, M. Ginolfi, G. C. Jones, I. Shivaei, Junais, D. Salak, P. Sawant
Summary: The physical properties of star-formation-driven outflows in a sample of 29 local dwarf galaxies were characterized in this study. Atomic outflow signatures were detected in the high-velocity tails of 11 sources, while weaker outflows were detected in the average stacked spectrum. The outflow rates were found to be comparable to the star-formation rates of the galaxies, with a significant amount of gas escaping into the intergalactic medium (IGM).
ASTRONOMY & ASTROPHYSICS
(2023)
Article
Astronomy & Astrophysics
J. Alvarez-Marquez, A. Crespo Gomez, L. Colina, M. Neeleman, F. Walter, A. Labiano, P. Perez-Gonzalez, A. Bik, H. U. Noorgaard-Nielsen, G. Ostlin, G. Wright, A. Alonso-Herrero, R. Azollini, K. I. Caputi, A. Eckart, O. Le Fevre, M. Garcia-Marin, T. R. Greve, J. Hjorth, O. Ilbert, S. Kendrew, J. P. Pye, T. Tikkanen, M. Topinka, P. van der Werf, M. Ward, E. F. van Dishoeck, M. Gudel, Th. Henning, P. O. Lagage, T. Ray, C. Waelkens
Summary: Using the Mid-IRfrared Instrument (MIRI) on board the James Webb Space Telescope (JWST), researchers have observed a luminous infrared starburst in the early Universe and discovered that it may be a precursor to massive quiescent galaxies. The observations show high star formation rates and clumpy stellar structures in the system.
ASTRONOMY & ASTROPHYSICS
(2023)
Article
Astronomy & Astrophysics
A. Beck, V Lebouteiller, S. C. Madden, C. Iserlohe, A. Krabbe, L. Ramambason, C. Fischer, S. T. Latzko, J. P. Perez-Beaupuits, M. Kaimierczak-Barthel
Summary: By measuring the metallicity and gas density in galaxies and using different emission line ratios, it is possible to derive physical properties and the metallicity of the interstellar medium.
ASTRONOMY & ASTROPHYSICS
(2022)
Article
Astronomy & Astrophysics
M. S. Mirakhor, S. A. Walker, J. Runge
Summary: Cosmological simulations predict that galaxy clusters grow through mergers with group-scale systems. This study analyzes deep Chandra observations of the NGC 4839 group falling into the Coma cluster, revealing a cold front feature and a bow shock. The power spectrum of surface brightness fluctuations in the tail indicates suppressed thermal conduction and long-lived small-scale turbulence.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2023)
Article
Astronomy & Astrophysics
Stuart E. Harper, Adam Barr, C. Dickinson, M. W. Peel, Roke Cepeda-Arroita, C. J. Copley, R. D. P. Grumitt, J. Patrick Leahy, J. L. Jonas, Michael E. Jones, J. Leech, T. J. Pearson, A. C. S. Readhead, Angela C. Taylor
Summary: Using new observations at 4.76 GHz and existing radio data at 1 degree resolution, we study the interstellar medium in the Andromeda galaxy (M 31) and provide new constraints on synchrotron spectral index and anomalous microwave emission (AME). Our analysis reveals the presence of AME in M 31, with a peak near 30 GHz and flux density of 0.27 +/- 0.09 Jy. The synchrotron spectral index is found to be flatter than in our own Galaxy, indicating a lack of strong spectral curvature. The distribution of AME in M 31 appears to be non-uniform and potentially confined to sub-regions, which should be confirmed with higher resolution observations.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2023)
Article
Astronomy & Astrophysics
Ethan Crosby, Helmut Jerjen, Oliver Mueller, Marcel Pawlowski, Mario Mateo, Markus Dirnberger
Summary: This study presents initial results of a survey conducted to investigate the environments of host L-* galaxies in the Local Volume (<10 Mpc) and identify satellite dwarf galaxy candidates. A comprehensive study on the NGC2683 galaxy revealed four new satellite galaxy candidates, which show morphological similarities with satellite galaxies in the Local Group. Principal component analysis of the satellite galaxy distribution suggests the presence of a flattened satellite plane in NGC2683.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2023)
Article
Astronomy & Astrophysics
D. Kakkad, M. Stalevski, M. Kishimoto, S. Knezevic, D. Asmus, F. P. A. Vogt
Summary: We present the morphology of ionized gas outflow in the Circinus galaxy using the narrow-field mode (NFM) of the MUSE instrument onboard the VLT. The observations reveal a collimated clumpy outflow profile originating near the active galactic nucleus (AGN), which fragments into two filaments, giving the outflow a 'tuning-fork' morphology. These structures remain undetected in lower spatial resolution data. The outflow is believed to interact with a dense clump in the interstellar medium, and the collimated structure may originate from jet-ISM interactions on small scales.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2023)
Article
Astronomy & Astrophysics
Francesca Bonanomi, Claudia Cicone, Paola Severgnini, Valentina Braito, Cristian Vignali, James N. N. Reeves, Mattia Sirressi, Isabel Montoya Arroyave, Roberto Della Ceca, Lucia Ballo, Massimo Dotti
Summary: We present observations of a nearby infrared luminous galaxy pair using ALMA and X-ray data collected from various telescopes. Our analysis suggests the presence of a powerful X-ray ultra-fast outflow in one component of the pair, and we also study the kinematics of CO(1-0) emission in both galaxies. The results provide constraints on the properties of the outflow and highlight the challenges in testing AGN feedback models.
ASTRONOMY & ASTROPHYSICS
(2023)