Results 11 to 20 of about 30,446 (206)

Stratified dust grains in the interstellar medium - II. Time-dependent interstellar extinction [PDF]

Monthly Notices of the Royal Astronomical Society, 2010
We consider a model of diffuse cloud dust in which carbon is deposited slowly on the surfaces of silicate cores. The solid carbon is also processed by the interstellar radiation so that its optical properties change with time. The computed interstellar extinction curves (ISECs) for this model evolve in time, lie close to the observed mean ISEC for ...
C. Cecchi Pestellini, A. Cacciola, M. A. Iati, SAIJA, Rosalba, F. Borghese, P. Denti, A. Giusto, D. A. Williams   +7 more
exaly   +5 more sources

Properties of interstellar dust responsible for extinction laws with unusually low total-to-selective extinction ratios of R=1−2 [PDF]

Planetary and Space Science, 2016
It is well known that the extinction properties along lines of sight to Type Ia supernovae are described by steep extinction curves with unusually low total-to-selective extinction ratios of Rv = 1.0-2.0. In order to reveal the properties of interstellar dust that causes such peculiar extinction laws, we perform the fitting calculations to the measured
Takaya Nozawa
openaire   +4 more sources

Decomposition of the central structure of NGC 2273 in the NIR: A case study

Astronomische Nachrichten, Volume 344, Issue 10, December 2023., 2023
Abstract The Seyfert 2 galaxy NGC 2273 is a prime target to explore how active nuclei can be fed. It has a star‐forming innermost nuclear ring with a radius of 0.33kpc from where material may be funneled to the supermassive black hole in its center. In this article, we discuss high‐resolution adaptive optics aided JHKs images of NGC 2273 taken with the
L. Schey, J. Heidt, A. Pramskiy, D. Thompson, G. Agapito, S. Esposito, R. Gredel, D. Miller, E. Pinna, A. Puglisi, F. Rossi, W. Seifert, G. Taylor, A. Quirrenbach   +13 more
wiley   +1 more source

One Relation for All Wavelengths: The Far-ultraviolet to Mid-infrared Milky Way Spectroscopic R(V)-dependent Dust Extinction Relationship

The Astrophysical Journal, 2023
Dust extinction is one of the fundamental measurements of dust grain sizes, compositions, and shapes. Most of the wavelength-dependent variations seen in Milky Way extinction are strongly correlated with the single parameter R ( V ) = A ( V )/ E ( B − V )
Karl D. Gordon, Geoffrey C. Clayton, Marjorie Decleir, E. L. Fitzpatrick, Derck Massa, Karl A. Misselt, Erik J. Tollerud   +6 more
doaj   +1 more source

Kinetics of the tautomerization of thioimidic acids R−C(SH)NH → R−C(S)NH2: For R = H, F, HO, CN, NC, H2N, HC(O), HC(S), HC≡ C, CH3, CF3, H2C=CH, HOCH2, H2NCH2,CH3C(O), C2H5, (CH3)2CH, C6H5

International Journal of Chemical Kinetics, Volume 55, Issue 11, Page 731-742, November 2023., 2023
Abstract The kinetics of the tautomerization of thio‐imidic acids RC(SH)NH were determined at low (50–300 K) and high (500–1500 K) temperatures as R was varied to encompass mono‐ and diatomic species H, F, HO, NC, CN through H2N, HC(O), HC(S), HC≡ C, H3C, F3C, HOCH2, H2C=CH, CH3C(O), H2NCH2 and including ethyl, isopropyl and phenyl groups. The presence
Judith Würmel, John M. Simmie
wiley   +1 more source

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

Interstellar Silicon Depletion and the Ultraviolet Extinction [PDF]

, 2017
Spinning small silicate grains were recently invoked to account for the Galactic foreground anomalous microwave emission. These grains, if present, will absorb starlight in the far ultraviolet (UV).
Li, Aigen, Mishra, Ajay
core   +3 more sources

dust_extinction: Interstellar Dust Extinction Models

Journal of Open Source Software
openaire   +3 more sources