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
D. Haasler, V. M. Rivilla, S. Martin, J. Holdship, S. Viti, N. Harada, J. Mangum, K. Sakamoto, S. Muller, K. Tanaka, Y. Yoshimura, K. Nakanishi, L. Colzi, L. Hunt, K. L. Emig, R. Aladro, P. Humire, C. Henkel, P. van der Werf
Summary: The study detected phosphorus nitride (PN) outside the Milky Way for the first time towards two giant molecular clouds of NGC 253, with abundance ratios and excitation temperatures calculated through LTE and non-LTE analyses. The findings suggest a possible shock-driven chemistry and cosmic-ray-driven photochemistry explanation for the presence of PN in NGC 253.
ASTRONOMY & ASTROPHYSICS
(2022)
Article
Astronomy & Astrophysics
R. E. Miura, D. Espada, A. Hirota, C. Henkel, S. Verley, M. I. N. Kobayashi, S. Matsushita, F. P. Israel, B. Vila-Vilaro, K. Morokuma-Matsui, J. Ott, C. Vlahakis, A. B. Peck, S. Aalto, M. R. Hogerheijde, N. Neumayer, D. Iono, K. Kohno, H. Takemura, S. Komugi
Summary: A census of giant molecular clouds (GMCs) in the inner region of the Centaurus A galaxy reveals similarities with GMC properties in spiral galaxies but distinct features in the circumnuclear disc, possibly influenced by the active galactic nucleus and/or shear motions.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2021)
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
Physics, Multidisciplinary
Thokchom Sanatombi, Senorita Devi, K. Yugindro Singh
Summary: In this study, the spectral properties of Ultraluminous X-ray sources in the face-on spiral galaxy M51 were investigated over a period of 21 years. From 23 Chandra observations, 43 X-ray sources with net source counts >100 were analyzed, identifying 29 X-ray binaries and 14 Ultraluminous X-ray sources (ULXs). Most X-ray binaries were in the low/hard state, while two ULXs were found in the soft spectral state. The source CXOU J133007.5+471106 showed a clear state transition from a hard state to a soft state in the year 2021 observations. Emission lines of ionized species were detected in the spectrum of CXOU J132950.7+471155 in two Chandra observations. CXOU J132943.3+471135 was identified as the softest and extremely luminous source in M51, consistent with harboring an Intermediate mass black hole.
CHINESE JOURNAL OF PHYSICS
(2023)
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
H. P. Saldano, M. Rubio, A. D. Bolatto, C. Verdugo, K. E. Jameson, A. K. Leroy
Summary: This study presents a CO(2-1) survey of the Small Magellanic Cloud (SMC) and characterizes the properties of the molecular clouds and star-forming regions within the SMC. The results show that the SMC clouds have different characteristics compared to the Milky Way, including lower turbulence and luminosity, but higher CO luminosity.
ASTRONOMY & ASTROPHYSICS
(2023)
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
Helena Faustino Vieira, Ana Duarte-Cabral, Timothy A. Davis, Nicolas Peretto, Matthew W. L. Smith, Miguel Querejeta, Dario Colombo, Michael Anderson
Summary: We have developed a new technique to map gas surface density in nearby galaxies at the parsec-scale by measuring dust attenuation in optical bands. The technique uses dust emission observations to calibrate the contribution of foreground light and assumes a layer of dust close to the mid-plane of face-on galaxies. Applying this technique to M51, we obtained a high-resolution dust and gas surface density map that is consistent with previous studies. This technique provides unprecedented spatial information for studying large-scale dynamics and stellar feedback mechanisms in the interstellar medium at parsec-scales.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2023)
Article
Astronomy & Astrophysics
Anan Lu, Hope Boyce, Daryl Haggard, Martin Bureau, Fu-Heng Liang, Lijie Liu, Woorak Choi, Michele Cappellari, Laurent Chemin, Melanie Chevance, Timothy A. Davis, Laurent Drissen, Jacob S. Elford, Jindra Gensior, J. M. Diederik Kruijssen, Thomas Martin, Etienne Masse, Carmelle Robert, Ilaria Ruffa, Laurie Rousseau-Nepton, Marc Sarzi, Gabriel Savard, Thomas G. Williams
Summary: The star formation efficiency varies across different environments. AGN feedback, galactic morphology, and dynamics are identified as possible causes for the observed radial profile of SFE in the central region of NGC 3169.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2022)
Article
Astronomy & Astrophysics
Lijie Liu, Martin Bureau, Leo Blitz, Timothy A. Davis, Kyoko Onishi, Mark Smith, Eve North, Satoru Iguchi
Summary: High spatial resolution observations of the nearby lenticular galaxy NGC 4429 reveal differences in giant molecular clouds compared to those in the Milky Way disc, with clouds appearing to be in a critical state where external gravity is as important as self-gravity in regulating the clouds.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2021)
Article
Astronomy & Astrophysics
S. Martin, J. G. Mangum, N. Harada, F. Costagliola, K. Sakamoto, S. Muller, R. Aladro, K. Tanaka, Y. Yoshimura, K. Nakanishi, R. Herrero-Illana, S. Muehle, S. Aalto, E. Behrens, L. Colzi, K. L. Emig, G. A. Fuller, S. Garcia-Burillo, T. R. Greve, C. Henkel, J. Holdship, P. Humire, L. Hunt, T. Izumi, K. Kohno, S. Koenig, D. S. Meier, T. Nakajima, Y. Nishimura, M. Padovani, V. M. Rivilla, S. Takano, P. P. van der Werf, S. Viti, Y. T. Yan
Summary: The study aims to explore the molecular richness in the central region of starburst galaxy NGC 253 using ALMA. Observations revealed 78 detected species, including rare isotopologues. High-resolution data sets such as this provide valuable insights into star-forming galaxies in the early Universe.
ASTRONOMY & ASTROPHYSICS
(2021)
Article
Astronomy & Astrophysics
Robin G. Tress, Mattia C. Sormani, Rowan J. Smith, Simon C. O. Glover, Ralf S. Klessen, Mordecai-Mark Mac Low, Paul Clark, Ana Duarte-Cabral
Summary: This study investigates the reactions of giant molecular clouds to different environmental conditions in galaxies, revealing that galaxy interactions or isolation have limited effects on cloud masses and sizes, but can promote the formation of counter-rotating clouds.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2021)
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
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
Fumi Egusa, Erin Mentuch Cooper, Jin Koda, Junichi Baba
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2017)
Article
Astronomy & Astrophysics
Akihiko Hirota, Fumi Egusa, Junichi Baba, Nario Kuno, Kazuyuki Muraoka, Tomoka Tosaki, Rie Miura, Hiroyuki Nakanishi, Ryohei Kawabe
PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF JAPAN
(2018)
Article
Astronomy & Astrophysics
Alex R. Pettitt, Fumi Egusa, Clare L. Dobbs, Elizabeth J. Tasker, Yusuke Fujimoto, Asao Habe
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2018)
Article
Astronomy & Astrophysics
L. Rousseau-Nepton, R. P. Martin, C. Robert, L. Drissen, P. Amram, S. Prunet, T. Martin, I. Moumen, A. Adamo, A. Alarie, P. Barmby, A. Boselli, F. Bresolin, M. Bureau, L. Chemin, R. C. Fernandes, F. Combes, C. Crowder, L. Della Bruna, S. Duarte Puertas, F. Egusa, B. Epinat, V. F. Ksoll, M. Girard, V. Gomez Llanos, D. Gouliermis, K. Grasha, C. Higgs, J. Hlavacek-Larrondo, I. -T. Ho, J. Iglesias-Paramo, G. Joncas, Z. S. Kam, P. Karera, R. C. Kennicutt, R. S. Klessen, S. Lianou, L. Liu, Q. Liu, A. Luiz de Amorim, J. D. Lyman, H. Martel, B. Mazzilli-Ciraulo, A. F. McLeod, A-L. Melchior, I. Millan, M. Molla, R. Momose, C. Morisset, H. -A. Pan, A. K. Pati, A. Pellerin, E. Pellegrini, I. Perez, A. Petric, H. Plana, D. Rahner, T. Ruiz Lara, L. Sanchez-Menguiano, K. Spekkens, G. Stasinska, M. Takamiya, N. Vale Asari, J. M. Vilchez
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2019)
Article
Astronomy & Astrophysics
Kana Morokuma-Matsui, Paolo Serra, Filippo M. Maccagni, Bi-Qing For, Jing Wang, Kenji Bekki, Tomoki Morokuma, Fumi Egusa, Daniel Espada, Rie E. Miura, Kouichiro Nakanishi, Baerbel S. Koribalski, Tsutomu T. Takeuchi
PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF JAPAN
(2019)
Article
Astronomy & Astrophysics
Alex R. Pettitt, Clare L. Dobbs, Junichi Baba, Dario Colombo, Ana Duarte-Cabral, Fumi Egusa, Asao Habe
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2020)
Article
Astronomy & Astrophysics
Yulong Gao, Fumi Egusa, Guilin Liu, Kotaro Kohno, Min Bao, Kana Morokuma-Matsui, Xu Kong, Xiaoyang Chen
Summary: High-resolution observations of ionized and molecular gas in the nuclear regions of galaxies are crucial for understanding the interplay of various processes such as star formation, gaseous inflows, stellar radiation, and feedback. The study reveals a superlinear Kennicutt-Schmidt law in the central region of NGC 1365, suggesting a steeper slope than previous observations. Furthermore, the presence of noncircular motion components in molecular and ionized hydrogen gas indicates potential interactions between central AGN activity and the surrounding gas distribution.
ASTROPHYSICAL JOURNAL
(2021)
Article
Astronomy & Astrophysics
Shigeki Inoue, Toshinobu Takagi, Atsushi Miyazaki, Erin Mentuch Cooper, Fumi Egusa, Hidenobu Yajima
Summary: The study investigates the dynamical states of grand-design spiral arms in three local galaxies and finds them to be marginally stable, suggesting they will not fragment. Molecular gas is the dominant component determining the stability of the arms, emphasizing the importance of precise conversion factors for accurate analysis.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2021)
Article
Astronomy & Astrophysics
Akiyoshi Tsujita, Ken-ichi Tadaki, Kotaro Kohno, Bunyo Hatsukade, Fumi Egusa, Yoichi Tamura, Yuri Nishimura, Jorge Zavala, Toshiki Saito, Hideki Umehata, Minju M. Lee
Summary: We report the detection of CO(12-11) line emission in the strongly-lensed submillimeter galaxy G09-83808 at z = 6.02. Further analysis of other detected emissions and dust continuum reveals the physical properties of the interstellar medium. The compact emission region of CO(12-11) is found to coincide with the dust continuum, indicating the concentration of warm and dense molecular gas in the central region.
PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF JAPAN
(2022)
Article
Astronomy & Astrophysics
Fumiya Maeda, Fumi Egusa, Kouji Ohta, Yusuke Fujimoto, Asao Habe
Summary: The dependence of star formation efficiency (SFE) on galactic structures, especially in the bar region, is debated. This study reports the SFEs in 18 nearby gas-rich barred galaxies with large apparent bar major axes. The SFE in the bar region is found to be lower than in other regions, contrary to previous studies. The low SFE in the bar region may be attributed to the noncircular motion of the bar causing large dynamical effects.
ASTROPHYSICAL JOURNAL
(2023)
Article
Astronomy & Astrophysics
Kana Morokuma-Matsui, Kenji Bekki, Jing Wang, Paolo Serra, Yusei Koyama, Tomoki Morokuma, Fumi Egusa, Bi-Qing For, Kouichiro Nakanishi, Barbel S. Koribalski, Takashi Okamoto, Tadayuki Kodama, Bumhyun Lee, Filippo M. Maccagni, Rie E. Miura, Daniel Espada, Tsutomu T. Takeuchi, Dong Yang, Minju M. Lee, Masaki Ueda, Kyoko Matsushita
Summary: In this study, we conducted a CO mapping survey of 64 galaxies in the Fornax cluster using the Atacama Large Millimeter/submillimeter Array Morita array. We found that the low star formation activity in these galaxies is due to a decrease in the cold gas mass fraction rather than a decrease in the star formation efficiency. Our comparison of the cold gas properties with the environmental properties suggests that the atomic gas is stripped tidally and by ram pressure, leading to a depletion of molecular gas and suppression of star formation.
ASTROPHYSICAL JOURNAL SUPPLEMENT SERIES
(2022)
Article
Astronomy & Astrophysics
Kianhong Lee, Kotaro Kohno, Bunyo Hatsukade, Fumi Egusa, Takuji Yamashita, Malte Schramm, Kohei Ichikawa, Masatoshi Imanishi, Takuma Izumi, Tohru Nagao, Yoshiki Toba, Hideki Umehata
Summary: We observed the redshifted CO(1-0) line emission towards the radio galaxy TN J0924-2201 at z = 5.2 using the Karl G. Jansky Very Large Array K-band. The emission was resolved into three clumps located off-center and 12-33 kpc away from the host galaxy's center. We estimated the infrared luminosity (LIR) and the star formation rate (SFR) of the host galaxy to be (9.3 +/- 1.7) x 10(11)L(circle dot) and 110 +/- 20 M-circle dot yr(-1), respectively. The three clumps indicate the presence of three massive molecular gas reservoirs. The nearest clump is apparently aligned with the radio jet axis, suggesting a radio-CO alignment and potential outflows, mergers, or jet-induced metal enrichment.
ASTROPHYSICAL JOURNAL
(2023)
Article
Astronomy & Astrophysics
Fumi Egusa, Yulong Gao, Kana Morokuma-Matsui, Guilin Liu, Fumiya Maeda
Summary: This study presents high-resolution mappings of the nearby barred spiral galaxy NGC 1365 in the CO(1-0) and CO(2-1) emission lines. The results show that both lines trace similar components of molecular gas, with the ratio of their integrated intensities reflecting the gas density and/or temperature. The study also finds a positive correlation between the ratios and a star formation rate indicator, indicating that molecular gas associated with recent star formation is denser and/or warmer.
ASTROPHYSICAL JOURNAL
(2022)
Article
Astronomy & Astrophysics
Jin Koda, Tsuyoshi Sawada, Kazushi Sakamoto, Akihiko Hirota, Fumi Egusa, Samuel Boissier, Daniela Calzetti, Jennifer Donovan Meyer, Bruce G. Elmegreen, Armando Gil de Paz, Nanase Harada, Luis C. Ho, Masato I. N. Kobayashi, Nario Kuno, Sergio Martin, Kazuyuki Muraoka, Kouichiro Nakanishi, Nick Scoville, Mark Seibert, Catherine Vlahakis, Yoshimasa Watanabe
ASTROPHYSICAL JOURNAL LETTERS
(2020)
Article
Astronomy & Astrophysics
Fumi Egusa, Akihiko Hirota, Junichi Baba, Kazuyuki Muraoka
ASTROPHYSICAL JOURNAL
(2018)