Results 21 to 30 of about 49,325 (179)

PAWS and POCO: NIR Astrophotonic Instruments for Astronomy

Astronomische Nachrichten, Volume 344, Issue 8-9, October-November 2023., 2023
Abstract For near‐infrared ground and space‐based astronomy, compact photonic devices can replace the large bulk optical components in spectrographs, frequency combs, beam combiners, and sky subtraction filters, thus saving cost, reducing volume, weight, and power requirements.
Kalaga Madhav, Alan Günther, Eloy Hernandez, Stella Vjes̆nica, Daniel Bodenmüller, Andreas Stoll, Christer Sandin, Haydar Altuğ Yıldırım, Martin M. Roth   +8 more
wiley   +1 more source

Chirality in Light–Matter Interaction

Advanced Materials, Volume 35, Issue 34, August 24, 2023., 2023
Recent advances in nanofabricated optical metamaterials designed to enhance the interaction between optical and structural chirality are explored, focusing on the role of chirality in biological systems and its use in current biosensing applications.
Andrew Lininger, Giovanna Palermo, Alexa Guglielmelli, Giuseppe Nicoletta, Madhav Goel, Michael Hinczewski, Giuseppe Strangi   +6 more
wiley   +1 more source

On the origin of de‐polarization in CB54

Astronomische Nachrichten, Volume 344, Issue 5, June 2023., 2023
Abstract We present polarimetric observations of the Bok globule CB54 in the far‐infrared via SOFIA/HAWC+ bands D (154 μ$$ \mu $$m) and E (214 μ$$ \mu $$m). We detect polarization with mean polarization degrees of p154 μm‾=7.7 %$$ \overline{p_{154\;\upmu \mathrm{m}}}=7.7\% $$ ±$$ \pm $$ 5.4%$$ \% $$ and p214 μm‾=8.5 %$$ \overline{p_{214\;\upmu \mathrm ...
Niko Zielinski, Sebastian Wolf, Kate Pattle   +2 more
wiley   +1 more source

Dust Extinction Law in Nearby Star-resolved Galaxies. II. M33 Traced by Supergiants

, 2022
The dust extinction curves toward individual sight lines in M33 are derived for the first time with a sample of reddened O-type and B-type supergiants obtained from the Local Group Galaxies Survey (LGGS).
Yuxi 钰溪 Wang 王, J. Gao 高, Y. Ren 任, B. Chen 陈   +3 more
semanticscholar   +1 more source

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

Interstellar Extinction and Elemental Abundances: Individual Sight Lines [PDF]

Astrophysical Journal Supplement Series, 2021
While it is well recognized that both the Galactic interstellar extinction curves and the gas-phase abundances of dust-forming elements exhibit considerable variations from one sight line to another, as yet most of the dust extinction modeling efforts ...
W. Zuo, Aigen Li, Gang Zhao
semanticscholar   +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

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

Magnesium and silicon in interstellar dust: X-ray overview [PDF]

Astronomy & Astrophysics, 2020
Context.The dense Galactic environment is a large reservoir of interstellar dust. Therefore, this region represents a perfect laboratory to study the properties of cosmic dust grains. X-rays are the most direct way to detect the interaction of light with
D. Rogantini, E. Costantini, S. Zeegers, M. Mehdipour, I. Psaradaki, A. Raassen, C. Vries, L. Waters   +7 more
semanticscholar   +1 more source

Relations between Mid-infrared Dust Emission and UV Extinction [PDF]

Astrophysical Journal, 2021
We analyze low-resolution Spitzer infrared (IR) 5−14 μm spectra of the diffuse emission toward a carefully selected sample of stars. The sample is composed of sight lines toward stars that have well-determined ultraviolet (UV) extinction curves and that ...
D. Massa, K. Gordon, E. Fitzpatrick
semanticscholar   +1 more source