Results 41 to 50 of about 2,793 (219)

The 2175 Angstrom Interstellar Extinction Bump: Is the Wavelength Variable?

, 2023
The most striking characteristics of the mysterious 2175 Angstrom extinction bump, the strongest spectroscopic absorption feature seen on the interstellar extinction curve, are the invariant central wavelength and variable bandwidth: its peak position at
Yang, X. J., Wang, Qian, Li, Aigen
core   +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

Interstellar grains: Effect of inclusions on extinction [PDF]

Earth, Planets and Space, 2011
A composite dust grain model which simultaneously explains the observed interstellar extinction, polarization, IR emission and the abundance constraints, is required. We present a composite grain model, which is made up of a host silicate oblate spheroid and graphite inclusions.
Katyal, Nisha, Gupta, Ranjan, Vaidya, D. B.   +2 more
openaire   +2 more sources

Polarization‐Selective Metamaterial Absorber for Long‐ to Very Long‐Wavelength Infrared Broadband

Nanophotonics, Volume 15, Issue 9, 13 May 2026.
Broadband and polarization‐selective metamaterial absorbers for long‐ to very long‐wavelength infrared light with high extinction ratios are designed and demonstrated, which provide a new method for broadband polarization‐selective absorbers. ABSTRACT Metamaterial absorbers have received extensive research interest and sustained attention due to their ...
Zhe Wu, Zhongzhu Liang, Xiaoyan Shi, Fuming Yang, Siyu Guo, Jihui Jiang, Wenwen Sun, Xintong Wei, Bing Sun, David R. Smith, Haiyang Xu   +10 more
wiley   +1 more source

Unified model for interstellar extinction and polarization

, 1967
The development of improved techniques for measuring interstellar extinction and polarization has led to a revival of interest in the investigation of grain models.
Krishna Swamy, K. S., Wickramasinghe, N. C.   +1 more
core   +1 more source

Interstellar extinction toward the Galactic bulge

, 2019
The past decade has seen rapid progress in studies on the Galactic bulge thanks to many large-scale surveys in both photometric and spectroscopic approaches.
Matsunaga, Noriyuki, Matsunaga, Noriyuki (6471578)   +1 more
core   +1 more source

Contribution of PAHs to the Interstellar Extinction Curve [PDF]

Symposium - International Astronomical Union, 1992
Absorption spectra of some gaseous PAHs, either pure species or natural mixtures, have been obtained in the VUV-visible region and compared to the interstellar extinction curve.The assumption that free PAHs are ubiquitous in the ISM cannot be rejected by incompatibility between the interstellar extinction curve and the absorption spectra of such ...
C. Joblin, A. Leger, P. Martin, D. Defourneau   +3 more
openaire   +1 more source

Discovery and Initial Investigation of a New Low Surface Brightness Planetary Nebula Candidate at High Galactic Latitude

Astronomische Nachrichten, Volume 347, Issue 3, March 2026.
ABSTRACT Planetary nebulae represent a late evolutionary phase of low‐ to intermediate‐mass stars. In this article, we present the serendipitous discovery of a previously unknown, faint potential Galactic planetary nebula (PN) in the constellation Camelopardalis, identified during a survey‐inspection, aiming at the detection of dwarf companions of the ...
W. E. Celnik, P. Köchling, S. Kotov, J. Kozok, Y. Galata, L. Magrini, A. Moiseev, M. Nischang, C. Reese, P. Remmel, P. Riepe, T. Zilch, K. Werner   +12 more
wiley   +1 more source

Interstellar extinction by quartz grains

, 1968
Knacke has pointed out that quartz particles possess strong absorption bands at λ ~ 10μ. Although these features occur in the spectral region 3-10μ, where Johnson has found humps in interstellar extinction curves, by itself
Krishna Swamy, K. S., Wickramasinghe, N. C.   +1 more
core   +1 more source

Climate Emergency and Different Ways to Fail? The Fermi Paradox, the Simulation Hypothesis, Agency and Hope

Journal for the Theory of Social Behaviour, Volume 55, Issue 4, December 2025.
ABSTRACT Humanity seems stuck on different ways to fail to meet the challenge posed by a declared climate emergency and manifest problems of ecological breakdown. Rather than reprise these failures, we use the Fermi Paradox and simulation hypothesis to make a simple point about agency. The argument unfolds in two sections.
Jamie Morgan
wiley   +1 more source