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
J. H. Yoon, Crystal L. Martin, S. Veilleux, M. Melendez, T. Mueller, K. D. Gordon, G. Cecil, J. Bland-Hawthorn, C. Engelbracht
Summary: This study presents deep far-infrared observations of the nearby galaxy NGC 891, revealing thermal emission, a dusty superbubble, and a dust spur. The findings suggest the presence of a superbubble region in NGC 891 that is developing into a galactic wind.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2021)
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
G. H. Heald, V Heesen, S. S. Sridhar, R. Beck, D. J. Bomans, M. Brueggen, K. T. Chyty, A. Damas-Segovia, R-J Dettmar, J. English, R. Henriksen, S. Ideguchi, J. Irwin, M. Krause, J-T Li, E. J. Murphy, B. Nikiel-Wroczynski, J. Piotrowska, R. J. Rand, T. Shimwell, Y. Stein, C. J. Vargas, Q. D. Wang, R. J. van Weeren, T. Wiegert
Summary: New radio continuum images of the edge-on starburst galaxy NGC 5775 were presented, revealing the extent of the non-thermal radio halo and estimating the magnetic field strength. An updated model incorporating an iso-thermal wind with a 'flux tube' geometry suggests that the wind influences the cosmic ray propagation and mass flow of interstellar material.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2022)
Article
Astronomy & Astrophysics
J. C. Motter, R. Riffel, T. Ricci, R. A. Riffel, T. Storchi-Bergmann, M. G. Pastoriza, A. Rodriguez-Ardila, D. Ruschel-Dutra, L. G. Dahmer-Hahn, N. Z. Dametto, M. R. Diniz
Summary: This study used adaptive optics assisted near-infrared observations to map the distribution and kinematics of ionized and molecular gas in the merger remnant galaxy NGC 34, revealing the presence of an AGN and a circumnuclear starburst ring. The emissions from [Fe II] and H-2 are enhanced in the nuclear region, likely due to a combination of photoionization by young stars, excitation by X-rays from the AGN, and shocks, indicating the presence of nuclear outflows.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2021)
Article
Astronomy & Astrophysics
P. Vermot, B. Barna, S. Ehlerova, M. R. Morris, J. Palous, R. Wunsch
Summary: By observing and comparing three regions of NGC 1068, researchers found that they have similar characteristics and belong to the same class of objects. They also determined that these regions are where the jet from the active galactic nucleus impacts massive molecular clouds.
ASTRONOMY & ASTROPHYSICS
(2023)
Article
Astronomy & Astrophysics
Y. D. Mayya, J. A. Alzate, L. Lomeli-Nuez, J. Zaragoza-Cardiel, V. M. A. Gomez-Gonzalez, S. Silich, D. Fernandez-Arenas, O. Vega, P. A. Ovando, L. H. Rodriguez, D. Rosa-Gonzalez, A. Luna, M. Zamora-Aviles, F. Rosales-Ortega
Summary: In this study, we investigate the properties of a kiloparsec-size superbubble in the late-type spiral galaxy NGC 628. This superbubble, located in the interarm region, is the largest among several holes observed with JWST/MIRI filters. The expanding shell of the superbubble contains a significant amount of gas in molecular form and has a population of excess blue, bright stars formed over the last 50 Myr.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2023)
Article
Astronomy & Astrophysics
C. Eibensteiner, A. T. Barnes, F. Bigiel, E. Schinnerer, D. Liu, D. S. Meier, A. Usero, A. K. Leroy, E. Rosolowsky, J. Puschnig, I Lazar, J. Pety, L. A. Lopez, E. Emsellem, I Beslic, M. Querejeta, E. J. Murphy, J. den Brok, A. Schruba, M. Chevance, S. C. O. Glover, Y. Gao, K. Grasha, H. Hassani, J. D. Henshaw, M. J. Jimenez-Donaire, R. S. Klessen, J. M. D. Kruijssen, H-A Pan, T. Saito, M. C. Sormani, Y-H Teng, T. G. Williams
Summary: This study presents new observations of molecular line emission in the central region of the double-barred spiral galaxy NGC 6946. The results show that HCO+ is highly correlated with the star formation rate surface density, but the behaviors of the dense gas fraction and star formation efficiency of the dense gas differ from expectations based on large-scale disc observations. Line ratio diagnostics reveal differences between different regions. Additionally, the study suggests that using the HCN/HNC ratio to probe kinetic temperatures is not suitable on kiloparsec and sub-kiloparsec scales, and the HCO+/HCN ratio might not be a unique indicator of AGN activity in galaxies.
ASTRONOMY & ASTROPHYSICS
(2022)
Article
Astronomy & Astrophysics
M. Wezgowiec, R. Beck, M. Hanasz, M. Soida, M. Ehle, R. -J. Dettmar, M. Urbanik
Summary: Possible signatures of gas heating by magnetic reconnection effects were found in the observations of spiral galaxy NGC 628, and clues for possible tidal interaction with the companion galaxy were also provided.
ASTRONOMY & ASTROPHYSICS
(2022)
Article
Astronomy & Astrophysics
M. Wezgowiec, R. Beck, M. Hanasz, M. Soida, M. Ehle, R-J Dettmar, M. Urbanik
Summary: This study investigates the magnetic fields and energy balance in the nearby spiral galaxy M 101 using radio and X-ray observations. The presence of magnetic arms is verified, and weak signatures of additional heating of the interstellar medium (ISM) by magnetic reconnection are found in certain regions. The X-ray emission mainly originates from the hot gas in the galactic halo of M 101.
ASTRONOMY & ASTROPHYSICS
(2022)
Article
Astronomy & Astrophysics
Lapo Fanciullo, Francisca Kemper, Kate Pattle, Patrick M. Koch, Sarah Sadavoy, Simon Coude, Archana Soam, Thiem Hoang, Takashi Onaka, Valentin J. M. Le Gouellec, Doris Arzoumanian, David Berry, Chakali Eswaraiah, Eun Jung Chung, Ray Furuya, Charles L. H. Hull, Jihye Hwang, Douglas Johnstone, Ji-hyun Kang, Kyoung Hee Kim, Florian Kirchschlager, Vera Konyves, Jungmi Kwon, Woojin Kwon, Shih-Ping Lai, Chang Won Lee, Tie Liu, A-Ran Lyo, Ian Stephens, Motohide Tamura, Xindi Tang, Derek Ward-Thompson, Anthony Whitworth, Hiroko Shinnaga
Summary: Polarized dust emission is a valuable indicator for studying the interstellar medium and star formation, but its interpretation is challenging. Comparing polarimetry at different wavelengths can help overcome this problem. This study analyzed the NGC 2071 molecular cloud using data from two different surveys, revealing significant changes in polarization angle and polarization fraction with wavelength. It also highlighted the limitations of using monochromatic intensity as a proxy for column density. Utilizing both long-wavelength and short-wavelength polarimetry is crucial for understanding the dust properties of molecular clouds and the relationship between magnetic field and star formation.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2022)
Article
Astronomy & Astrophysics
Woorak Choi, Lijie Liu, Martin Bureau, Michele Cappellari, Timothy A. Davis, Jindra Gensior, Fu-Heng Liang, Anan Lu, Thomas G. Williams, Aeree Chung
Summary: We present high-resolution ALMA observations of the central region of the nearby barred spiral galaxy NGC 5806. The molecular gas distribution in NGC 5806 exhibits a highly structured pattern with a clear nucleus, nuclear ring, and offset dust lanes. We identify 170 giant molecular clouds (GMCs) with comparable sizes but larger gas masses and observed linewidths than those in the Milky Way disc. The properties of these clouds suggest bar-driven gas shocks and inflows along the offset dust lanes.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2023)
Article
Astronomy & Astrophysics
A. Garcia-Rodriguez, A. Usero, A. K. Leroy, F. Bigiel, M. J. Jimenez-Donaire, D. Liu, M. Querejeta, T. Saito, E. Schinnerer, A. Barnes, F. Belfiore, I. Beslic, Y. Cao, M. Chevance, D. A. Dale, J. S. den Brok, C. Eibensteiner, S. Garcia-Burillo, S. C. O. Glover, R. S. Klessen, J. Pety, J. Puschnig, E. Rosolowsky, K. Sandstrom, M. C. Sormani, Y. -h. Teng, T. G. Williams
Summary: We obtained HCN and HCO+ (J = 3-2) images of nearby star-forming galaxies NGC 3351, NGC 3627, and NGC 4321 using the Morita ALMA Compact Array. The images have high spatial resolution and reveal the inner regions of the galaxies. We compared various parameters and found that the behavior of the line ratios cannot be explained by a single excitation parameter.
ASTRONOMY & ASTROPHYSICS
(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
Lijie Liu, Martin Bureau, Guang-Xing Li, Timothy A. Davis, Dieu D. Nguyen, Fu-Heng Liang, Woorak Choi, Mark R. Smith, Satoru Iguchi
Summary: In this study, we investigate the molecular structures in the dwarf galaxy NGC 404 using high-resolution observations. We find two distinct regions: a gravitationally stable central region and a gravitationally unstable molecular ring. The central region exhibits a steeper size-linewidth relation and larger virial parameters, suggesting more turbulent gas dynamics. In contrast, the molecular ring shows a shallower mass-size relation and larger virial parameters for clumps compared to clouds, indicating different physical mechanisms regulating density structures and dynamics. We propose a collision model to explain the results in the molecular ring, showing that clump-clump collisions driven by gravitational instabilities and galactic shear play a significant role in regulating clump properties and gas turbulence.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2022)