Article
Astronomy & Astrophysics
Tine Colman, Jean-Francois Robitaille, Patrick Hennebelle, Marc-Antoine Miville-Deschenes, Noe Brucy, Ralf S. Klessen, Simon C. O. Glover, Juan D. Soler, Davide Elia, Alessio Traficante, Sergio Molinari, Leonardo Testi
Summary: This study investigates the mechanisms that maintain turbulence in the interstellar medium (ISM). The results show that turbulence driven solely by stellar feedback is not sufficient to explain the large-scale structure of ISM, suggesting that another large-scale driving mechanism is needed.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2022)
Article
Astronomy & Astrophysics
Y. K. Ma, N. M. McClure-Griffiths, S. E. Clark, S. J. Gibson, J. Th van Loon, J. D. Soler, M. E. Putman, J. M. Dickey, M. -Y Lee, K. E. Jameson, L. Uscanga, J. Dempsey, H. Denes, C. Lynn, N. M. Pingel
Summary: High-spatial-resolution HI observations reveal the magnetic alignment of H I filaments in the nearby Galactic filamentary structures and the Small Magellanic Cloud (SMC). The H I filaments in the north-eastern end of the SMC main body (Bar' region) and the transition area between the main body and the tidal feature (Wing' region) are preferentially aligned with the magnetic field traced by starlight polarization. This discovery suggests that filamentary H I structures can be magnetically aligned outside of the Milky Way.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2023)
Article
Astronomy & Astrophysics
Shu Liu, Junzhi Wang, Fei Li, Jingwen Wu, Zhi-Yu Zhang, Di Li, Ningyu Tang, Pei Zuo
Summary: Spatial variations of optical depths have been detected in Galactic massive star-forming regions. In this study, we mapped 51 Galactic massive star-forming regions using the SMT telescope and obtained reliable measurements of spatially resolved optical depths for 30 regions.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2023)
Article
Astronomy & Astrophysics
P. J. Kavanagh, M. Sasaki, M. D. Filipovic, S. D. Points, L. M. Bozzetto, F. Haberl, P. Maggi, C. Maitra
Summary: This paper presents deep X-ray coverage of ten supernova remnants (SNRs) in the Large Magellanic Cloud (LMC) and confirms seven of them as bona-fide SNRs. The study provides insights into the position, size, and physical properties of the confirmed SNRs, and enhances our understanding of the fainter X-ray SNR population in the LMC.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2022)
Article
Astronomy & Astrophysics
Cameron P. M. Bell, Maria-Rosa L. Cioni, Angus H. Wright, David L. Nidever, I-Da Chiang, Samyaday Choudhury, Martin A. T. Groenewegen, Clara M. Pennock, Yumi Choi, Richard de Grijs, Valentin D. Ivanov, Pol Massana, Ambra Nanni, Noelia E. D. Noel, Knut Olsen, Jacco Th van Loon, A. Katherina Vivas, Dennis Zaritsky
Summary: In this study, a map of the total intrinsic reddening of the LMC is presented, derived from the spectral energy distributions of background galaxies. The map shows regions of enhanced reddening that are consistent with far-IR emission and known star-forming regions. This study represents a large-scale categorization of extragalactic sources behind the LMC.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2022)
Article
Astronomy & Astrophysics
Kosuke Fujii, Norikazu Mizuno, J. R. Dawson, Tsuyoshi Inoue, Kazufumi Torii, Toshikazu Onishi, Akiko Kawamura, Erik Muller, Tetsuhiro Minamidani, Kisetsu Tsuge, Yasuo Fukui
Summary: Investigations on the H i envelope of young and massive GMCs in star-forming regions N48 and N49 reveal highly filamentary H i gas with molecular clumps distributed along the filamentary features. This suggests that GMC formation involves the filamentary nature of the atomic medium.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2021)
Article
Astronomy & Astrophysics
Gerwyn H. Jones, Paul C. Clark, Simon C. O. Glover, Alvaro Hacar
Summary: HCN J = 1-0 emission is commonly used as a dense gas tracer, but recent observations suggest it can also trace more diffuse gas in molecular clouds. In this study, we investigate the relationship between gas density and HCN emission using simulations of cloud-cloud collisions. We find that HCN emission traces gas with a lower mean density than previously thought, and in some cases, HCN emission is observed even when gas density is below the typical critical density. We also derive conversion factors for HCN luminosity-to-mass, providing valuable information for future studies.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2023)
Article
Astronomy & Astrophysics
Paul C. Clark, Anthony P. Whitworth
Summary: The model proposed explains the evolution of a star cluster's SMF involving turbulent fragmentation and competitive accretion, where low-mass seed proto-systems grow into high-mass stars through accretion. The overall shape of the SMF remains consistent even with varying mass supply rates, with the high-mass tail extending as long as gas supply lasts.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2021)
Article
Astronomy & Astrophysics
Jacob L. Ward, J. M. Diederik Kruijssen, Melanie Chevance, Jaeyeon Kim, Steven N. Longmore
Summary: This paper aims to study the lifecycle of molecular clouds in the Large Magellanic Cloud (LMC) and determines their lifetime to be around 11.8 million years. The study finds that molecular clouds in the LMC are decoupled from galactic dynamics and have short lifetimes regulated by internal processes, while atomic clouds are correlated with galactic dynamical timescales.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2022)
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
S. Zamora, Angeles Diaz, Elena Terlevich, Vital Fernandez
Summary: This article presents a method to calculate extinction corrections based on weaker lines of He I and applies it to the study of the 30 Doradus nebula. The comparison between helium and hydrogen determinations of c(H beta) yields compatible results within the errors, and using both sets of lines simultaneously significantly reduces the error in the derivation.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2022)
Article
Astronomy & Astrophysics
I Beslic, A. T. Barnes, F. Bigiel, J. Puschnig, J. Pety, C. Herrera Contreras, A. K. Leroy, A. Usero, E. Schinnerer, S. E. Meidt, E. Emsellem, A. Hughes, C. Faesi, K. Kreckel, F. M. C. Belfiore, M. Chevance, J. S. den Brok, C. Eibensteiner, S. C. O. Glover, K. Grasha, M. J. Jimenez-Donaire, R. S. Klessen, J. M. D. Kruijssen, D. Liu, I Pessa, M. Querejeta, E. Rosolowsky, T. Saito, F. Santoro, A. Schruba, M. C. Sormani, T. G. Williams
Summary: This study presents new observations of high critical density molecular tracers towards the nearby strongly barred galaxy NGC 3627, revealing variations in the distribution of dense molecular gas across different galactic environments and a close relationship between dense gas dynamics and local enhancements in star formation.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2021)
Article
Astronomy & Astrophysics
B. L. Tatton, J. Th van Loon, M-R L. Cioni, K. Bekki, C. P. M. Bell, S. Choudhury, R. de Grijs, M. A. T. Groenewegen, V. D. Ivanov, M. Marconi, J. M. Oliveira, V Ripepi, S. Rubele, S. Subramanian, N-C Sun
Summary: This study utilizes intermediate-age red clump stars to map the 3D structure of the Small Magellanic Cloud and interpret its interaction history with the Large Magellanic Cloud and the Milky Way. Significant deviations from a flat plane distribution of stars are observed, especially in the periphery and eastern side of the SMC, indicating strong interaction with the LMC a few billion years ago.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2021)
Article
Astronomy & Astrophysics
Lukas Neumann, Molly J. Gallagher, Frank Bigiel, Adam K. Leroy, Ashley T. Barnes, Antonio Usero, Jakob S. den Brok, Francesco Belfiore, Ivana Beslic, Yixian Cao, Melanie Chevance, Daniel A. Dale, Cosima Eibensteiner, Simon C. O. Glover, Kathryn Grasha, Jonathan D. Henshaw, Maria J. Jimenez-Donaire, Ralf S. Klessen, J. M. Diederik Kruijssen, Daizhong Liu, Sharon Meidt, Jerome Pety, Johannes Puschnig, Miguel Querejeta, Erik Rosolowsky, Eva Schinnerer, Andreas Schruba, Mattia C. Sormani, Jiayi Sun, Yu-Hsuan Teng, Thomas G. Williams
Summary: In this study, new HCN (1-0) data from the ALMOND survey and CO (2-1) data from the PHANGS-ALMA survey were used to examine the molecular gas density structure and star formation rate in nearby galaxies. The study found positive correlations (negative) between the HCN/CO (SFR/HCN) ratio and the surface density, velocity dispersion, and internal turbulent pressure of the molecular gas. Overall, these findings indicate a close relationship between molecular gas density, molecular cloud properties, and star formation.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2023)
Article
Astronomy & Astrophysics
J. R. Knies, M. Sasaki, Y. Fukui, K. Tsuge, F. Haberl, S. Points, P. J. Kavanagh, M. D. Filipovic
Summary: The giant HII region 30 Doradus in the Large Magellanic Cloud is one of the most active star-forming regions in the Local Group. Studies revealed collision of two large gas structures around 30 Dor, and the presence of two hot plasma components in the X-ray spur, one potentially heated by massive stars and the other by collision of HI gas.
ASTRONOMY & ASTROPHYSICS
(2021)
Article
Astronomy & Astrophysics
Y. T. Yan, C. Henkel, K. M. Menten, Y. Gong, J. Ott, T. L. Wilson, A. Wootten, A. Brunthaler, J. S. Zhang, J. L. Chen, K. Yang
Summary: This research investigates the origin and characteristics of NH3 (9,6) maser lines in high-mass star-forming regions. New NH3 (9,6) masers are discovered in Cep A and G34.26+0.25, increasing the number of known regions hosting these masers. The newly found masers are related to outflows.
ASTRONOMY & ASTROPHYSICS
(2022)
Article
Astronomy & Astrophysics
J. Syed, J. D. Soler, H. Beuther, Y. Wang, S. Suri, J. D. Henshaw, M. Riener, S. Bialy, S. Rezaei Kh, J. M. Stil, P. F. Goldsmith, M. R. Rugel, S. C. O. Glover, R. S. Klessen, J. Kerp, J. S. Urquhart, J. Ott, N. Roy, N. Schneider, R. J. Smith, S. N. Longmore, H. Linz
Summary: This study investigates the physical properties of the Maggie filament, a large-scale atomic filament, and suggests that it could be a precursor to giant molecular filaments. The study also reveals the position and kinematic characteristics of Maggie within the Milky Way.
ASTRONOMY & ASTROPHYSICS
(2022)
Article
Astronomy & Astrophysics
Jonathan D. Henshaw, Mark R. Krumholz, Natalie O. Butterfield, Jonathan Mackey, Adam Ginsburg, Thomas J. Haworth, Francisco Nogueras-Lara, Ashley T. Barnes, Steven N. Longmore, John Bally, J. M. Diederik Kruijssen, Elisabeth A. C. Mills, Henrik Beuther, Daniel L. Walker, Cara Battersby, Alyssa Bulatek, Thomas Henning, Juergen Ott, Juan D. Soler
Summary: In this study, a arc-shaped molecular line emission feature located within the G0.253+0.016 cloud in the Central Molecular Zone was investigated. The arc was found to have kinematics and radiative properties that are consistent with predictions for an expanding bubble driven by the wind from a high-mass star. This discovery suggests that G0.253+0.016 may not be as quiescent as previously thought and may harbor a star cluster formed approximately 0.4 million years ago.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2022)
Article
Astronomy & Astrophysics
Mikito Kohno, Atsushi Nishimura, Shinji Fujita, Kengo Tachihara, Toshikazu Onishi, Kazuki Tokuda, Yasuo Fukui, Yusuke Miyamoto, Shota Ueda, Ryosuke Kiridoshi, Daichi Tsutsumi, Kazufumi Torii, Tetsuhiro Minamidani, Kazuya Saigo, Toshihiro Handa, Hidetoshi Sano
Summary: In this study, new giant molecular filaments (GMFs) were discovered in the Vulpecula OB association, which are likely to be associated with the Sh 2-86 star cluster. Further investigations revealed that these GMFs coincide with the infrared dust emission. The scenario of multiple cloud interaction may explain cluster formation in the Vulpecula OB association.
PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF JAPAN
(2022)
Article
Astronomy & Astrophysics
R. Konishi, R. Enokiya, Y. Fukui, K. Muraoka, K. Tokuda, T. Onishi
Summary: NGC 253 is a starburst galaxy with high activity in its central molecular zone. An analysis of the data revealed a loop-like structure associated with a star cluster. The weak bar potential of NGC 253 suggests that magnetic acceleration may be responsible for the creation of this structure.
ASTROPHYSICAL JOURNAL
(2022)
Article
Astronomy & Astrophysics
Molly K. Finn, Remy Indebetouw, Kelsey E. Johnson, Allison H. Costa, C-H Rosie Chen, Akiko Kawamura, Toshikazu Onishi, Jurgen Ott, Marta Sewilo, Kazuki Tokuda, Tony Wong, Sarolta Zahorecz
Summary: In this study, a comparison is presented between low-J (CO)-C-13 and CS observations of four different regions in the LMC. It is found that the quiescent Molecular Ridge has lower kinetic energy and surface densities compared to the actively forming massive star regions of 30 Dor, N159, and N113. These differences suggest that the Molecular Ridge is less actively forming massive stars due to its less dense gas rather than excess kinetic energy suppressing collapse. Furthermore, variations in physical conditions and energy balance are observed within the Molecular Ridge, weakly correlated with distance from sites of massive star formation and local star formation activity within the clouds.
ASTRONOMICAL JOURNAL
(2022)
Article
Astronomy & Astrophysics
H. Sano, H. Yamaguchi, M. Aruga, Y. Fukui, K. Tachihara, M. D. Filipovic, G. Rowell
Summary: New H I observations of Type Ia supernova remnant SN 1006 using the Australia Telescope Compact Array reveal expanding gas motion with a velocity of approximately 4 km/s and a mass of around 1000 M-circle dot. The spatial extent of the expanding shell matches that of SN 1006. A hypothesis is proposed that suggests SN 1006 exploded inside a wind-blown bubble created by accretion winds from a white dwarf and a companion star, with the forward shock already reaching the wind wall. The research also found a relatively low total energy of cosmic-ray protons (W_p) in SN 1006 and predicts that it may increase in the future.
ASTROPHYSICAL JOURNAL
(2022)
Article
Astronomy & Astrophysics
Yukiko Tanaka, Hiroyuki Uchida, Takaaki Tanaka, Yuki Amano, Yosuke Koshiba, Takeshi Go Tsuru, Hidetoshi Sano, Yasuo Fukui
Summary: Recent high-resolution X-ray spectroscopy has revealed the possible occurrence of charge exchange X-ray emission in supernova remnants. Through the X-ray study of SNR G296.1-0.5, it was found that the oxygen vii line showed a high forbidden-to-resonance ratio in two different regions, which cannot be explained by a simple thermal model. Spectral analysis suggests the presence of charge exchange, which is supported by new radio observations indicating the presence of molecular clouds associated with the shells.
ASTROPHYSICAL JOURNAL
(2022)
Article
Astronomy & Astrophysics
Kazuki Tokuda, Taisei Minami, Yasuo Fukui, Tsuyoshi Inoue, Takeru Nishioka, Kisetsu Tsuge, Sarolta Zahorecz, Hidetoshi Sano, Ayu Konishi, C-H Rosie Chen, Marta Sewilo, Suzanne C. Madden, Omnarayani Nayak, Kazuya Saigo, Atsushi Nishimura, Kei E. Tanaka, Tsuyoshi Sawada, Remy Indebetouw, Kengo Tachihara, Akiko Kawamura, Toshikazu Onishi
Summary: Massive dense clumps in the Large Magellanic Cloud can serve as an important laboratory for studying the formation of populous clusters. The N159W-North clump is found to be the most CO-intense region in the galaxy, with several protostellar sources and CO outflows. One particularly massive and dense protostellar source, MMS-2, is identified and found to contain massive starless core candidates. The observations also reveal filamentary clouds and a large-scale gas compression event that may have contributed to the formation of the star-forming complex.
ASTROPHYSICAL JOURNAL
(2022)
Article
Astronomy & Astrophysics
Y. T. Yan, C. Henkel, K. M. Menten, Y. Gong, H. Nguyen, J. Ott, A. Ginsburg, T. L. Wilson, A. Brunthaler, A. Belloche, J. S. Zhang, N. Budaiev, D. Jeff
Summary: This study reports the widespread presence of NH3 maser emission in the Sagittarius B2 molecular cloud and star-forming region complex. High angular resolution data reveals 18 maser spots associated with shocks caused by outflows or the expansion of UCH II regions. Sgr B2 is unique in its ability to simultaneously measure multiple NH3 masers, thus providing important insights into their origin and excitation mechanisms.
ASTRONOMY & ASTROPHYSICS
(2022)
Article
Astronomy & Astrophysics
M. Aruga, H. Sano, Y. Fukui, E. M. Reynoso, G. Rowell, K. Tachihara
Summary: A study of the interstellar medium (ISM) towards the supernova remnant (SNR) Puppis A reveals that the ISM is dense and highly clumpy, and is mainly distributed in the northeast. The CO distribution suggests shock heating/acceleration, supporting the assertion that Puppis A is located in the Local Arm. The interaction between the ISM and the SNR suggests a hadronic origin of the gamma-rays, with a possible contribution from a leptonic component.
ASTROPHYSICAL JOURNAL
(2022)
Article
Astronomy & Astrophysics
Arghyadeep Basu, Nirupam Roy, Henrik Beuther, Jonas Syed, Jurgen Ott, Juan D. Soler, Jeroen Stil, Michael R. Rugel
Summary: The study shows that the gas in the Galactic plane has a lower average temperature, higher molecular fraction, and some gas with higher spin temperature compared to that at high Galactic latitudes. This may be due to the presence of a small fraction of cold gas with slightly higher temperature and lower density on the Galactic plane.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2022)
Article
Astronomy & Astrophysics
Russell Shanahan, Jeroen M. Stil, Loren Anderson, Henrik Beuther, Paul Goldsmith, Juergen Ott, Michael Rugel, Juan Soler, Jonas Syed
Summary: In this study, we present the polarization and Faraday rotation properties of four supernova remnants (SNRs) observed in the L-band radio continuum survey. We detect polarization in three of the SNRs and find variations in the degree of fractional polarization. We also observe multi-component Faraday rotation in some cases. These results indicate the presence of a partially filled shell structure with small-scale magnetic field and internal Faraday rotation.
ASTROPHYSICAL JOURNAL
(2022)
Article
Astronomy & Astrophysics
Daisei Abe, Tsuyoshi Inoue, Rei Enokiya, Yasuo Fukui
Summary: Stars are born in dense molecular filaments, regardless of their mass. The compression of the interstellar medium by shocks leads to the formation of filaments in molecular clouds. This study investigates the impact of the duration of the shock-compressed layer on filament and star formation, and how the initial conditions for massive star formation are realized. The results show that different shock durations lead to different outcomes, with short durations resulting in expanding filaments and long durations leading to the formation of massive supercritical filaments and star clusters.
ASTROPHYSICAL JOURNAL
(2022)
Article
Astronomy & Astrophysics
Takuma Kokusho, Hiroki Torii, Hidehiro Kaneda, Yasuo Fukui, Kengo Tachihara
Summary: We conducted a systematic study on the evolutionary stages and stellar masses of young stellar objects (YSOs) in the Large Magellanic Cloud (LMC) to understand the star formation properties in the galaxy. Our YSO sample consists of 4825 sources identified from previous studies. We fitted the spectral energy distributions of the YSOs from optical to infrared wavelengths using a model containing stellar, polycyclic aromatic hydrocarbon, and dust emissions. We analyzed the stellar-to-dust luminosity ratios to determine the evolutionary stages of the YSOs and found that younger YSOs have lower ratios.
ASTROPHYSICAL JOURNAL
(2023)