Results 41 to 50 of about 37,732 (195)

The Astrodust+PAH Model: A Unified Description of the Extinction, Emission, and Polarization from Dust in the Diffuse Interstellar Medium

The Astrophysical Journal, 2023
We present a new model of interstellar dust in which large grains are a single composite material, “astrodust,” and nanoparticle-sized grains come in distinct varieties including polycyclic aromatic hydrocarbons (PAHs). We argue that a single-composition
Brandon S. Hensley, B. T. Draine
doaj   +1 more source

Dust production scenarios in galaxies at z ~ 6-8.3

, 2019
The mechanism of dust formation in galaxies at high redshift is still unknown. Asymptotic giant branch (AGB) stars and explosions of supernovae (SNe) are possible dust producers, and non-stellar processes may substantially contribute to dust production ...
Leśniewska, A., Michałowski, M. J.
core   +1 more source

Synthesized grain size distribution in the interstellar medium [PDF]

, 2012
We examine a synthetic way of constructing the grain size distribution in the interstellar medium (ISM). First we formulate a synthetic grain size distribution composed of three grain size distributions processed with the following mechanisms that govern
A Gauger, A Jones, AK Inoue, AK Inoue, B Hellyer, BD Savage, BT Draine, BT Draine, BT Draine, CF McKee, CJ Lada, CW Ormel, D Calzetti, D Yamasawa, E Dwek, F Hoyle, F Hoyle, H Hirashita, H Hirashita, H Hirashita, H Yan, JC Weingartner, JE O’Donnell, JEL Bishop, JS Mathis, K Liffman, L Mattsson, MAT Groenewegen, NC Wickramasinghe, RS Asano, S Bianchi, S Hofner, S Zhukovska, SH Kim, T Nozawa, T Nozawa, YC Pei   +36 more
core   +2 more sources

Tracing the Ingredients for a Habitable Earth from Interstellar Space through Planet Formation [PDF]

, 2015
We use the C/N ratio as a monitor of the delivery of key ingredients of life to nascent terrestrial worlds. Total elemental C and N contents, and their ratio, are examined for the interstellar medium, comets, chondritic meteorites and terrestrial planets;
Bergin, Edwin A., Blake, Geoffrey A., Ciesla, Fred, Hirschmann, Marc M., Li, Jie   +4 more
core   +2 more sources

A Tale of Two Sightlines: Comparison of Hydrocarbon Dust Absorption Bands toward Cygnus OB2-12 and the Galactic Center

The Astrophysical Journal
Infrared spectra of hydrocarbon dust absorption bands toward the bright hypergiant Cygnus OB2-12 are compared to published spectra of the Quintuplet Cluster, a sightline to the Galactic center. The Cyg OB2-12 data include a new ground-based 2.86−3.70 μ m
Yvonne J. Pendleton, T. R. Geballe, Laurie E. U. Chu, Marjorie Decleir, Karl D. Gordon, A. G. G. M. Tielens, Louis J. Allamandola, Jeroen Bouwman, J. E. Chiar, Curtis Dewitt, Burcu Gunay, Thomas Henning, Vito Mennella, M. E. Palumbo, Alexey Potapov, Maisie Rashman, Sascha Zeegers   +16 more
doaj   +1 more source

Survey on AI‐Enabled Computer Vision Technologies and Applications for Space Robotic Missions

Journal of Field Robotics, EarlyView.
ABSTRACT This survey provides a comprehensive overview of recent advancements and challenges in Artificial Intelligence (AI)‐enabled computer vision (CV) techniques for space robotic missions, spanning critical phases such as Entry, Descent, and Landing (EDL), orbital operations, and planetary surface exploration.
Maciej Quoos, Steven Kay, Julia Wajoras, Robert Field, Evridiki V. Ntagiou, Fakher Mohammad, Yang Gao   +6 more
wiley   +1 more source

Thermodynamics of Giant Molecular Clouds: The Effects of Dust Grain Size

The Astrophysical Journal
The dust grain size distribution (GSD) likely varies significantly across star-forming environments in the Universe, but its impact on star formation remains unclear. This ambiguity arises because the GSD interacts nonlinearly with processes like heating,
Nadine H. Soliman, Philip F. Hopkins, Michael Y. Grudić   +2 more
doaj   +1 more source

Synthetic Approaches to Complex Organic Molecules in the Cold Interstellar Medium

Frontiers in Astronomy and Space Sciences, 2022
The observation and synthesis of organic molecules in interstellar space is one of the most exciting and rapidly growing topics in astrochemistry.
Eric Herbst, Eric Herbst, Robin T. Garrod, Robin T. Garrod   +3 more
doaj   +1 more source

The interface between the stellar wind and interstellar medium around R Cassiopeiae revealed by far-infrared imaging

, 2009
The circumstellar dust shells of intermediate initial-mass (about 1 to 8 solar masses) evolved stars are generated by copious mass loss during the asymptotic giant branch phase. The density structure of their circumstellar shell is the direct evidence of
A. K. Speck, A. Karska, Deutsch, Dorschner, Engelke, Finkbeiner, H. Fukushi, H. Izumiura, H. Mito, Haniff, Hofmann, I. Yamamura, Izumiura, K. M. Geise, Kawada, Knapp, Knapp, Knapp, M. Matsuura, Martin, Matthews, Meixner, Murakami, Müller, N. Matsunaga, Perryman, Pourbaix, R. E. Stencel, Rieke, Shirahata, Steffen, Stencel, T. Tanabé, T. Ueta, Ueta, Ueta, Ueta, van Leeuwen, Villaver, Vlemmings, Wareing, Werner, Wilkin, Y. Ita, Y. Nakada, Young   +45 more
core   +1 more source

Dust in the Local Interstellar Wind [PDF]

, 1999
The gas-to-dust mass ratios found for interstellar dust within the Solar System, versus values determined astronomically for the cloud around the Solar System, suggest that large and small interstellar grains have separate histories, and that large ...
Dorschner, J. M., Frisch, P. C., Geiss, J., Greenberg, J. M., Grün, E., Hoppe, P., Jones, A. P., Krätschmer, W., Landgraf, M., Linde, T. J., Morfill, G. E., Reach, W. T., Slavin, J. D., Svestka, J., Witt, A. N., Zank, G. P.   +15 more
core   +2 more sources