Results 51 to 60 of about 135,058 (169)

Interstellar Molecules [PDF]

, 1978
Observations of the spectral lines of a great many interstellar molecules has made it possible for radio astronomers to construct a scenario for the formation of ...
Knapp, Gillian
core  

B-fields and Dust in Interstellar Filaments Using Dust Polarization (BALLAD-POL). III. Grain Alignment and Disruption Mechanisms in G34.43+0.24 Using Polarization Observations from JCMT/POL-2

The Astrophysical Journal
Polarization of starlight and thermal dust emission due to aligned non-spherical grains helps us to trace magnetic field ( B -field) morphology in molecular clouds and to study grain alignment mechanisms.
Saikhom Pravash, Archana Soam, Pham Ngoc Diep, Thiem Hoang, Nguyen Bich Ngoc, Le Ngoc Tram   +5 more
doaj   +1 more source

Micro‐ and nanoscale studies of insoluble organic matter and C‐rich presolar grains in Murchison and Sutter's Mill in preparation for Bennu sample analysis

Meteoritics &Planetary Science, Volume 59, Issue 10, Page 2831-2850, October 2024.
Abstract Samples of B‐type asteroid (101955) Bennu returned by the Origins, Spectral Interpretation, Resource Identification, and Security–Regolith Explorer (OSIRIS‐REx) spacecraft will provide unique insight into the nature of carbonaceous asteroidal matter without the atmospheric entry heating or terrestrial weathering effects associated with ...
A. N. Nguyen, S. J. Clemett, K. Thomas‐Keprta, C. M. O'D. Alexander, D. P. Glavin, J. P. Dworkin, H. C. Connolly Jr, D. S. Lauretta   +7 more
wiley   +1 more source

B-fields and Dust in Interstellar Filaments Using Dust Polarization (BALLAD-POL). VI. Grain Alignment Mechanisms in the Massive Quiescent Filament G16.96+0.27 Using Dust Polarization Observations from JCMT/POL-2

The Astrophysical Journal Supplement Series
Dust polarization induced by aligned nonspherical grains acts as an important tool to trace the magnetic field ( B -field) morphologies and strengths in molecular clouds and constrain grain properties and their alignment mechanisms.
Saikhom Pravash, Thiem Hoang, Archana Soam, Qi-Lao Gu, Tie Liu, Pham Ngoc Diep, Le Ngoc Tram, Nguyen Bich Ngoc   +7 more
doaj   +1 more source

Limitations of the modified blackbody fit method for determining molecular cloud properties

Astronomische Nachrichten, Volume 345, Issue 4, May 2024.
Abstract Achieving a comprehensive understanding of the star and planet formation process is one of the fundamental tasks of astrophysics, requiring detailed knowledge of the physical conditions during the different phases of this process. During the earliest stages, that is, concerning physical processes in molecular clouds and filaments, the column ...
Niko Zielinski, Sebastian Wolf
wiley   +1 more source

The ALMA-QUARKS Survey: Fibers’ Role in Star Formation Unveiled in an Intermediate-mass Protocluster Region of the Vela D Cloud

The Astrophysical Journal
In this paper, we present a detailed analysis of the IRS 17 filament within the intermediate-mass protocluster IRAS 08448-4343 (of ∼10 ^3 L _⊙ ), using ALMA data from the ATOMS 3 mm and QUARKS 1.3 mm surveys.
Dongting Yang, Hong-Li Liu, Tie Liu, Anandmayee Tej, Xunchuan Liu, Jinhua He, Guido Garay, Amelia Stutz, Lei Zhu, Sheng-Li Qin, Fengwei Xu, Pak-Shing Li, Mika Juvela, Pablo García, Paul F. Goldsmith, Siju Zhang, Xindi Tang, Patricio Sanhueza, Shanghuo Li, Chang Won Lee, Swagat Ranjan Das, Wenyu Jiao, Xiaofeng Mai, Prasanta Gorai, Yichen Zhang, Zhiyuan Ren, L. Viktor Tóth, Jihye Hwang, Leonardo Bronfman, Ken’ichi Tatematsu, Lokesh Dewangan, James O. Chibueze, Suinan Zhang, Gang Wu, Jinjin Xie   +34 more
doaj   +1 more source

Fordern galaktische Zwerge die Kosmologie heraus?

Physik in unserer Zeit, Volume 55, Issue 3, Page 128-135, May 2024.
Dem Standardmodell der Kosmologie zufolge sollten sich Satellitengalaxien nahezu zufällig um ihre Hauptgalaxie verteilen und bewegen. Beobachtete Systeme um die Milchstraße und andere nahe Galaxien sind deutlich geordneter. Ist dies ein Problem für das Modell oder sogar für unser Verständnis der Dunklen Materie?
Marcel S. Pawlowski
wiley   +1 more source

Reconstructing the 3D Structure of Filamentary Structures with the Elliptical Inverse Abel Transformation Method

The Astrophysical Journal
The study of the volume density distribution of filamentary structures in molecular clouds is crucial for investigating the mechanism of star formation and can reveal the fragmentation process under the effects of gravitational collapse, magnetic fields,
Yapeng Zhang, Shibo Yuan, Weiming An, Yongli Ping, Jiayong Zhong   +4 more
doaj   +1 more source

Brecciation at the grain scale within the lithologies of the Winchcombe Mighei‐like carbonaceous chondrite

Meteoritics &Planetary Science, Volume 59, Issue 5, Page 1068-1100, May 2024.
Abstract The Mighei‐like carbonaceous (CM) chondrites have been altered to various extents by water–rock reactions on their parent asteroid(s). This aqueous processing has destroyed much of the primary mineralogy of these meteorites, and the degree of alteration is highly heterogeneous at both the macroscale and nanoscale.
Luke Daly, Martin D. Suttle, Martin R. Lee, John Bridges, Leon Hicks, Pierre‐Etienne M. C. Martin, Cameron J. Floyd, Laura E. Jenkins, Tobias Salge, Ashley J. King, Natasha V. Almeida, Diane Johnson, Patrick W. Trimby, Haithem Mansour, Fabian B. Wadsworth, Gavyn Rollinson, Matthew J. Genge, James Darling, Paul A. J. Bagot, Lee F. White, Natasha R. Stephen, Jennifer T. Mitchell, Sammy Griffin, Francesca M. Willcocks, Rhian Jones, Sandra Piazolo, Joshua F. Einsle, Alice Macente, Lydia J. Hallis, Aine O'Brien, Paul F. Schofield, Sara S. Russell, Helena Bates, Caroline Smith, Ian Franchi, Lucy V. Forman, Phil A. Bland, David Westmoreland, Iain Anderson, Richard Taylor, Mark Montgomery, Mark Parsons, Jérémie Vasseur, Matthias van Ginneken, Penelope J. Wozniakiewicz, Mark J. Burchell, Daniel Hallatt, Luke S. Alesbrook, Vassilia Spathis, Richard Worden, Julie Behnsen, Kate Black, the UK Fireball Alliance   +52 more
wiley   +1 more source

G321.93-0.01: A Rare Site of Multiple Hub-filament Systems with Evidence of Collision and Merging of Filaments

The Astronomical Journal
Hub-filament systems (HFSs) are potential sites of massive star formation (MSF). To understand the role of filaments in MSF and the origin of HFSs, we conducted a multiscale and multiwavelength observational investigation of the molecular cloud G321.93–0.
A. K. Maity, L. K. Dewangan, N. K. Bhadari, Y. Fukui, A. Haj Ismail, O. R. Jadhav, Saurabh Sharma, H. Sano   +7 more
doaj   +1 more source