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Astronomy & Astrophysics
N. Le, A. Karska, M. Figueira, M. Sewilo, A. Mirocha, Ch. Fischer, M. Kazmierczak-Barthel, R. Klein, M. Gawronski, M. Koprowski, K. Kowalczyk, W. J. Fischer, K. M. Menten, F. Wyrowski, C. Konig, L. E. Kristensen
Summary: This study focuses on the FIR line emission, CO rotational temperature, UV radiation field, and H2 number density toward Gy 3-7. The results suggest that gas cooling via FIR lines in Gy 3-7 is not dependent on metallicity.
ASTRONOMY & ASTROPHYSICS
(2023)
Article
Astronomy & Astrophysics
Yue Hu, Christoph Federrath, Siyao Xu, Sajay Sunny Mathew
Summary: The interaction between turbulence, magnetic fields, self-gravity, and stellar feedback is crucial for understanding star formation. This study focuses on the effects of self-gravity and outflow feedback on the turbulent velocity within molecular clouds. The results show that outflow feedback can change the scaling of velocity fluctuations and amplify turbulence. Self-gravity and protostellar outflows increase velocity fluctuations and enhance fragmentation. The study also finds that self-gravity has a more significant effect on smaller dense clumps, while outflow feedback drives a higher fraction of solenoidal modes relative to compressive modes.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2022)
Article
Astronomy & Astrophysics
Shunta Koga, Yoshihiro Kawasaki, Masahiro N. Machida
Summary: The aim of this study is to investigate dust dynamics on a large scale and its coupling with gas fluid in the star formation process. The results show that dust particles with different sizes are coupled with gas, and larger dust grains tend to concentrate in the central region faster than smaller grains.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2022)
Article
Astronomy & Astrophysics
Michael D. Smith, Carl Richards
Summary: The Mach number is a crucial parameter in determining the driving properties and impact on the environment of a supersonic jet. Through numerical simulations, we investigate the effects of different Mach numbers and jet overpressures on the flow pattern and shock locations. We also analyze potential observational diagnostics and the energy transferred into the environment.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2023)
Article
Astronomy & Astrophysics
Soumen Deb, Roland Kothes, Erik Rosolowsky
Summary: This paper analyzes 13 outflows in the Cygnus X star-forming region using new observations and develops a method to measure their properties using existing line data. The results show consistency in mechanical properties and associated protostars. The developed method shows agreement in properties within a factor of 2.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2021)
Article
Astronomy & Astrophysics
L. Bonne, N. Peretto, A. Duarte-Cabral, A. Schmiedeke, N. Schneider, S. Bontemps, A. Whitworth
Summary: By studying the newly discovered star-forming cloud G345.88-1.10, strong constraints on the evolution of massive protostellar objects can be obtained. The study found that the infrared-quiet fragments in the cloud are spatially associated with a powerful molecular outflow, and the presence of radio continuum and ionizing radiation does not seem to affect the evolution of the cavities.
ASTRONOMY & ASTROPHYSICS
(2022)
Article
Astronomy & Astrophysics
Mauricio Tapia, Paolo Persi
Summary: The well-studied massive star-forming region IRAS 23139+5939 is found to be a multiple massive young stellar object with Class I spectral energy distribution. It is associated with methanol and water masers, compact H ii regions, and H-2 emission knots. There is also a young embedded stellar cluster with evidence of protoplanetary discs. Gaia Data Release 3 and parallaxes indicate a common distance of 3.34 kpc to IRAS 23139+5939 and a nearby H alpha-emission star.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2023)
Article
Astronomy & Astrophysics
M. M. Vazzano, M. Fernandez-Lopez, A. Plunkett, I. De Gregorio-Monsalvo, A. Santamaria-Miranda, S. Takahashi, C. Lopez
Summary: The study aims to test the coherence between commonly used evolutionary tracers by observing seven objects in the Lupus clouds at different evolutionary stages. The findings reveal that the evolutionary classification aligns with previous studies except for one source, suggesting a need for more detailed observations to refine classifications. The study also indicates that the most common evolutionary tracers in the literature are useful for broad classifications but lack consistency to differentiate sources within the same Class.
ASTRONOMY & ASTROPHYSICS
(2021)
Article
Astronomy & Astrophysics
A. H. Cerqueira, B. Lefloch, A. Esquivel, P. R. Rivera-Ortiz, C. Codella, C. Ceccarelli, L. Podio
Summary: The study revisits the physical origin of the mass-velocity relationship in jet-driven protostellar outflows and investigates the contributions of different regions of the outflow. The research finds that excluding the jet contribution, the mass-velocity relationship can be well described by a single exponential law, while the jet contribution results in additional components in the mass-velocity relationship.
ASTRONOMY & ASTROPHYSICS
(2021)
Article
Astronomy & Astrophysics
Shunta Koga, Masahiro N. Machida
Summary: We conducted a three-dimensional resistive magnetohydrodynamics simulation to study the motion of dust grains in the early stage of star formation. Our results show that most small dust grains located within a certain region are ejected by the protostellar outflow, while only a few large dust grains are ejected. The behavior of dust motion after settling into the circumstellar disk can be divided into two trends, with dust grains reaching the inner disk falling onto the protostar and those reaching the outer disk or disk outer edge surviving without radial drift. These surviving grains can contribute to dust growth, suggesting that the outer disk regions may favor planet formation.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2023)
Article
Astronomy & Astrophysics
N. L. Isequilla, M. E. Ortega, M. B. Areal, S. Paron
Summary: The study reveals evidence of fragmentation towards the molecular hot core G34-MM1 on two different spatial scales, with multiple molecular outflows associated with it, which may support a competitive accretion scenario.
ASTRONOMY & ASTROPHYSICS
(2021)
Article
Astronomy & Astrophysics
M. E. Ortega, A. Marinelli, N. L. Isequilla, S. Paron
Summary: The study reveals that the massive clump AGAL35 contains four low- to intermediate-mass cores, providing important insights into the interstellar fragmentation processes and early star formation activities.
ASTRONOMY & ASTROPHYSICS
(2022)
Article
Astronomy & Astrophysics
Rosario Lopez, Angels Riera, Robert Estalella, Gabriel Gomez
Summary: Jets and outflows are commonly associated with young stellar objects, and their morphology can be spatially discontinuous due to temporal variability. This study aimed to search for large-scale optical Herbig-Haro objects around a sample of IRAS sources to trace young stellar objects. Deep narrowband images were used to analyze shock-excited line emission and scattered line emission for a sample of 15 IRAS sources.
ASTRONOMY & ASTROPHYSICS
(2021)
Article
Astronomy & Astrophysics
Antoine Verliat, Patrick Hennebelle, Marta Gonzalez, Yueh-Ning Lee, Sam Geen
Summary: This passage discusses the conditions for star and stellar cluster formation and the role of stellar feedback. The study found that protostellar outflows can reduce the star formation rate, while ionising radiation can expel remaining gas and reduce the mass of the cluster. Furthermore, outflows can increase the velocity dispersion of high density gas and affect the rotation of the cluster.
ASTRONOMY & ASTROPHYSICS
(2022)
Article
Astronomy & Astrophysics
I. M. Skretas, A. Karska, F. Wyrowski, K. M. Menten, H. Beuther, A. Ginsburg, A. Hernandez-Gomez, C. Gieser, S. Li, W. -J. Kim, D. A. Semenov, L. Bouscasse, I. B. Christensen, J. M. Winters, A. Hacar
Summary: The morphology and kinematics of the DR21 Main outflow are found to be more consistent with a typical bipolar outflow rather than an explosive counterpart. The opening angles of the outflow lobes decrease with velocity, and no evidence is found for elongated filament-like structures expected in explosive outflows.
ASTRONOMY & ASTROPHYSICS
(2023)