Results 91 to 100 of about 50,798 (260)

The Flattest Infrared Extinction Curve in Four Isolated Dense Molecular Cloud Cores

The Astrophysical Journal Letters
The extinction curve of interstellar dust in the dense molecular cloud cores is crucial for understanding dust properties, particularly size distribution and composition.
Jun Li, Bingqiu Chen, Biwei Jiang, He Zhao, Botao Jiang, Xi Chen   +5 more
doaj   +1 more source

On the Origin of the North Celestial Pole Loop

The Astrophysical Journal, 2023
The North Celestial Pole Loop (NCPL) provides a unique laboratory for studying the early-stage precursors of star formation. Uncovering its origin is key to understanding the dynamical mechanisms that control the evolution of its contents. In this study,
Antoine Marchal, Peter G. Martin
doaj   +1 more source

Recent progress in theory and observational study of dust grain alignment and rotational disruption in star-forming regions

Frontiers in Astronomy and Space Sciences, 2022
Modern understanding of dust astrophysics reveals that radiative torques (RATs) arising from the radiation–dust interaction can induce two fundamental effects: grain alignment and rotational disruption.
Le Ngoc Tram, Thiem Hoang, Thiem Hoang
doaj   +1 more source

The 2200 A bump and the UV extinction curve

, 2012
The 2200 A bump is a major figure of interstellar extinction. Extinction curves with no bump however exist and are, with no exception, linear from the near-infrared down to 2500 A at least, often over all the visible-UV spectrum.
Bondar, Bradley, Cardelli, Cecchi-Pestellini, Divan, Désert, Fitzpatrick, Gordon, Herbig, Li, Li, Mulas, Nandy, Papoular, Savage, Schalén, Seaton, Steglich, Wegner, Whitford, Wickramasinghe, Wu, Yastrebov, Zagury, Zagury, Zagury, Zagury, Zagury, Zagury, Zagury, Zagury, Zagury, Zagury, Zonca   +33 more
core   +1 more source

Extinction law variations and dust excitation in the spiral galaxy NGC 300 [PDF]

, 2005
We investigate the origin of the strong radial gradient in the ultraviolet-to-infrared ratio in the spiral galaxy NGC 300, and emphasize the importance of local variations in the interstellar medium geometry, concluding that they cannot be neglected with
A. Gil de Paz, Andreani P., B. F. Madore, Breysacher J., Buat V., C. Martin, Deharveng L., Desert F. X., d’Odorico S., G. Helou, Gordon K. D., H. Roussel, Kim S. C., Lequeux J., M. Seibert, Mas-Hesse J. M., Misselt K. A., Rosa M. R., Sauvage M., Sersic J. L., Webster B. L.   +20 more
core   +3 more sources

Lactea: Web‐Based Spectrum‐Preserving Multi‐Resolution Visualization of the GAIA Star Catalog

Computer Graphics Forum, Volume 44, Issue 3, June 2025.
Abstract The explosion of data in astronomy has resulted in an era of unprecedented opportunities for discovery. The GAIA mission's catalog, containing a large number of light sources (mostly stars) with several parameters such as sky position and proper motion, is playing a significant role in advancing astronomy research and has been crucial in ...
Reem Alghamdi, Markus Hadwiger, Guido Reina, Alberto Jaspe‐Villanueva   +3 more
wiley   +1 more source

Emergence of Optical Activity and Surface Morphology Changes in Racemic Amino Acid Films Under Circularly Polarized Lyman‐α Light Irradiation

Chirality, Volume 36, Issue 11, November 2024.
The photoreaction induced by Lyman‐α circularly polarized light (CPL) irradiation in racemic alanine film is more complex than simple preferential photolysis of enantiopure alanine molecules, and formation of larger molecules is observed. Circular networks of order of 100 nm scale are introduced in the alanine film surface by the irradiation.
Masahiro Kobayashi, Jun‐ichi Takahashi, Hiroshi Ota, Koichi Matsuo, Mohamed I. A. Ibrahim, Taketoshi Minato, Gen Fujimori, Masahiro Katoh, Kensei Kobayashi, Yoko Kebukawa, Hiroaki Nakamura   +10 more
wiley   +1 more source

Ultraviolet Extinction by Interstellar Dust in External Galaxies: M31

The Astrophysical Journal, 1996
Hubble Space Telescope (HST) Faint Object Spectrograph (FOS) spectra of stars in OB associations of M31 are used to derive the UV extinction by interstellar dust in M31 by three different methods: (1) comparing spectra of M31 star pairs, (2) comparing spectra of M31 stars to those of Galactic standard stars, and (3) comparing M31 star spectra to ...
Luciana Bianchi, Geoffrey C. Clayton, Ralph C. Bohlin, J. B. Hutchings, Philip Massey   +4 more
openaire   +1 more source

Analyzing dust particle size and size distribution on extracted particles by SEM and comparing with light scattering techniques

Plasma Processes and Polymers, Volume 21, Issue 8, August 2024.
A comparison is presented between Kinetic Mie Polarimetry and Scanning Electron Microscopy of plasma‐grown amorphous hydrogenated carbon (a‐C:H) particles. The analysis includes particle size distributions, which show that the standard deviation grows linearly, resulting in a constant shape.
Andreas Petersen, Jakob Wötzel, Christiane Zamponi, Julia Kobus, Sebastian Wolf, Franko Greiner   +5 more
wiley   +1 more source

The Chocolate Chip Cookie Model: Dust-to-metal Ratio of H ii Regions

The Astrophysical Journal Letters, 2023
Using a sample of face-on star-forming galaxies selected from the Sloan Digital Sky Survey, we statistically derive the typical optical depth τ _cl of individual H ii regions based on the “Chocolate Chip Cookie” model of Lu et al. (2022).
Jiafeng Lu, Shiyin Shen, Fang-Ting Yuan, Qi Zeng   +3 more
doaj   +1 more source