Results 21 to 30 of about 30,446 (206)

Multiwavelength astrophysics of the blazar OJ 287 and the project MOMO

Astronomische Nachrichten, Volume 344, Issue 4, May 2023., 2023
Abstract We are carrying out the densest and longest multiyear, multiwavelength monitoring project of OJ 287 ever done. The project MOMO (Multiwavelength Observations and Modeling of OJ 287) covers wavelengths from the radio to the high‐energy regime. A few selected observations are simultaneous with those of the Event Horizon Telescope (EHT).
S. Komossa, A. Kraus, D. Grupe, M.L. Parker, A. Gonzalez, L.C. Gallo, M.A. Gurwell, S. Laine, S. Yao, S. Chandra, L. Dey, J.L. Gómez, K. Hada, D. Haggard, A.R. Hollett, H. Jermak, S. Jorstad, T.P. Krichbaum, S. Markoff, C. McCall, J. Neilsen, M. Nowak   +21 more
wiley   +1 more source

A persistent influence of supernovae on biodiversity over the Phanerozoic

Ecology and Evolution, Volume 13, Issue 3, March 2023., 2023
It shows the correlation between diversity and supernovae frequency. Abstract It is an open question what has constrained macroevolutionary changes in marine animal diversity on the time scale of the Phanerozoic. Here, we will show that supernovae appear to have significantly influenced the biodiversity of life.
Henrik Svensmark
wiley   +1 more source

DIBs, Interstellar Dust, and Extinction [PDF]

Proceedings of the International Astronomical Union, 2013
AbstractThe relationship between DIBs and dust is still unknown. The correlation between reddening and DIB strength means that the DIBs are mixed in with the dust and gas in interstellar clouds. The DIBs are relatively stronger in the diffuse interstellar medium than in dense clouds.
openaire   +1 more source

Decadal and Annual Variations in Meteoric Flux From Ulysses, Wind, and SOFIE Observations

Journal of Geophysical Research: Space Physics, Volume 127, Issue 10, October 2022., 2022
Abstract Our solar system is filled with meteoric particles, or cosmic dust, which is either interplanetary or interstellar in origin. Interstellar dust (ISD) enters the heliosphere due to the relative motion of the sun and the interstellar flow. Interplanetary dust (IPD) comes primarily from asteroid collisions or comet sublimation, and comprises the ...
Mark E. Hervig, David Malaspina, Veerle Sterken, Lynn B. Wilson III, Silvan Hunziker, Scott M. Bailey   +5 more
wiley   +1 more source

Extinction of Taurus, Orion, Perseus, and California Molecular Clouds Based on the LAMOST, 2MASS, and Gaia Surveys. I. 3D Extinction and Structure

The Astrophysical Journal, 2023
The 3D extinction and structure are studied for the Taurus, Orion, Perseus, and California molecular clouds based on the LAMOST spectroscopy. Stellar color excess is calculated with the intrinsic color index derived from the atmospheric parameters in the
ZheTai Cao, Biwei Jiang, He Zhao, Mingxu Sun   +3 more
doaj   +1 more source

Modeling galactic extinction

Atti della Accademia Peloritana dei Pericolanti : Classe di Scienze Fisiche, Matematiche e Naturali, 2011
We present a model for interstellar extinction dust, in which we assume a bimodal distribution of extinction carriers, a dispersion of core-mantle grains, supplemented by a collection of PAHs in free molecular form.
C. Cecchi-Pestellini, G. Mulas, S. Casu, M.A. Iati', R. Saija, A. Cacciola, F. Borghese, P. Denti   +7 more
doaj   +1 more source

The Ultraviolet to Mid-infrared Extinction Law of the Taurus Molecular Cloud Based on the Gaia DR3, GALEX, APASS, Pan-STARRS1, 2MASS, and WISE Surveys

The Astrophysical Journal, 2023
Interstellar-dust extinction law is essential for interpreting observations. In this work, we investigate the ultraviolet (UV)–mid-infrared (IR) extinction law of the Taurus molecular cloud and its possible variations. We select 504,988 dwarf stars (4200
Ling Li, Shu Wang, Xiaodian Chen, QingQuan Jiang   +3 more
doaj   +1 more source

Dust absorption and scattering in the silicon K-edge [PDF]

, 2019
The composition and properties of interstellar silicate dust are not well understood. In X-rays, interstellar dust can be studied in detail by making use of the fine structure features in the Si K-edge.
Costantini, E., de Groot, F., de Vries, C. P., Mohr, P., Mutschke, H., Rogantini, D., Tielens, A. G. G. M., Zeegers, S. T.   +7 more
core   +3 more sources

The nature of interstellar dust as revealed by light scattering

Atti della Accademia Peloritana dei Pericolanti : Classe di Scienze Fisiche, Matematiche e Naturali, 2011
Interstellar dust was first identified through the extinction that it causes of optical starlight. Initially, observational and theoretical studies of extinction were made to identify simple ways of removing the effect of extinction.
D. A. Williams
doaj   +1 more source

The extinction and dust-to-gas structure of the planetary nebula NGC 7009 observed with MUSE [PDF]

, 2016
The large field and wavelength range of MUSE is well suited to mapping Galactic planetary nebulae (PN). The bright PN NGC 7009 was observed with MUSE on the VLT during the Science Verification of the instrument in seeing of 0.6".
Barlow, M. J., Monreal-Ibero, A., Ueta, T., Walsh, J. R., Wesson, R., Zijlstra, A. A.   +5 more
core   +3 more sources